please give me answer on mail. With the lowest cost and simplest design, a constant potential exciter has a voltage output of the rectifier as a direct ratio of AC input to DC output. This AC power from Pilot Exciter is then rectified by Thyristor Bridge. Main Exciter of Brushless Excitation System consists of Stator and Rotor part. What is IGBT? As this method of Excitation i.e. Sorry for getting back so late; been really busy. As this method of Excitation i.e. A brushless exciter is provided for controlling excitation of a synchronous motor. Alternate solutions are there any…. A brushless type synchronous motor incorporates the use of a remotely located DC power source called a “pilot exciter” or “control power exciter”. Now at engineering stage you have a choice to choose whether you want Static excitation or Brushless excitation. For each arm of Diode, two fuses are connected as shown in the Schematic diagram of the Brushless Excitation System. Fig. if pmg fail to build up emf at starting , how can i give excitaion to field flashing of alternator This ac voltage is rectified by diodes mounted on rotating diode wheel. Let him know in the comment section. The main and the pilot exciter are driven by the main shaft. The brushless exciter uses a center tapped rotating transformer, a discharge resistor, a field winding which has one end coupled to the ends of the rotating transformer and the other end connected to the discharge resistor and center tap of the rotating transformer. Brushless Exciter is normally air cooled. The brushless excitation system consists an alternator, rectifier, main exciter and a permanent magnet generator alternator. Normally PMG has 16 poles, so the AC produced by PMG will be at a frequency of 400 Hz (f = PN/120, N =3000 rpm). Thyristor bridge is controlled depending on firing angle. The necessary magnetic field needed to produce torque is mainly generatd by these rotor coils. This AC power from Pilot Exciter is then rectified by Thyristor Bridge. Thank you in advance. The DC “control” power source If done properly the rotor and stator will synchronize and the rotor will rotate at synchronous speed. Starting Methods of Synchronous Motor. But in Brushless Excitation System we don’t need any start up power supply for field excitation. To avoid the problems related to brushes, the energy transfer necessary to feed the rotor coil should preferably succeed contactless through a rotary transformer. The Synchronous motors use brushless Exciter which decreases the maintenance problem. Yet during start-up the stator’s current induces a small field in the rotor that turns out in the intial rotation of the motor without any torque built up. However, you’ll recall that, different from any alternating current (AC) asynchronous machine, synchronous motors require direct current (DC) to be supplied to its fields’ windings. If you have any doubt, please write in comment box. AC-supplied exciters are in widespread use mainly for medium and larger sized motors, however the principle of operation of the synchronous machine is still the same, so the AC supplied to the exciter is rectified through brushes and slip rings to inject DC to the rotor’s windings and generate the field required for the rotor to follow the stator’s alternating field. The field winding is … Synchronous Motor Model - Starting POWER SOURCE •s One Phase Model •AC Power on stator sets up rotating field magnetic flux •For starting, rotor amortiseur acts as shorted transformer secondary, current produces rotor flux like induction motor •Torque produced accelerates load to near sync speed Now main exciter output ac voltage will also be automatically controlled (as field is controlled). The rotor winding has a function similar to the permanent magnets of PM motors. Commentdocument.getElementById("comment").setAttribute( "id", "afe25d4f1776324b7126febcbbd534f0" );document.getElementById("a0868ac6d7").setAttribute( "id", "comment" ); Subscribe to our mailing list and get interesting stuff and updates to your email inbox. Kinetics is the only manufacturer in the United States to design and manufacture the critical segments required for an off shaft brushless type motor excitation system as a single source manufacturer. The brushless exciter is basically a small three-phase alternator winding and three-phase rectifier located on the shaft of the rotor. The brushless exciter uses a center tapped rotating transformer, a discharge resistor, a field winding which has one end coupled to the ends of the rotating transformer and the other end connected to the discharge resistor and center tap of the rotating transformer. Thyristor Power Regulator controls the DC output of Thyristor Bridge Rectifier. – Construction and Working Principle, Binary Coded Decimal or BCD Number Explained, What is UPS? I mean that if the stator of the exciter is supplied with a DC source, it obviously won’t excite anything at zero speed right? This DC is then feed to the field winding of Main Exciter which is wounded on Stator of main Exciter. This Armature thus produces three phase AC power by using the mechanical energy of Rotor. What is the requirements of main exciter if we feed rectified dc output from AVR to gen field directly through diode bridge? Both diode wheels are connected to complete a bridge rectifier arm. What is the connection of winding of main exciter ? Retrofitting a synchronous motor with a brushless field exciter. Note that Permanent Magnet of Pilot Exciter is mounted on Rotor, Armature of PMG is stationary as it is wounded on Stator and Field winding of Main Exciter is stationary as it is also wounded to Stator of Main Exciter. The armature of the pilot exciter is connected to the stator of the main exciter which is a 3-Ф synchronous generator. For application where there’s no clutch, usually slip rings are preferred, typically supplying DC; however AC with an alternator design might be also be used or found in the field. The first step is to accelerate the motor to near synchronous speed. This 3 phase output from main excitor is rectified by uncontrolled rotating diode bridge and applied to field winding. Brushless Excitation System consists of two major parts: Pilot Exciter is Permanent Magnet, also called PMG (Permanent Magnet Generator) mounted on the rotor shaft. And thanks a lot for the comprehensive answer! Thus this Fan forces the air to pass through the Air Guide (see in figure) and main Exciter Armature for cooling. 220volts ac supply from PMG comes to excitation panel where it is rectified by thyristor bridge. Armature of PMG is shown in figure below. Please also provide necessary data. So this type of motor is not suited for loaded startup applications. Normally PMG has 16 poles, so the AC produced by PMG will be at a frequency of 400 Hz (f = PN/120, N =3000 rpm). WEG Electric Machinery’s (WEM) brushless excitation system consists of a high frequency AC generator (armature & field) and rotating rectifier bridge. That is why PMG produces AC power at this higher frequency. By this way we control the field current input to the field wing of Turbo Generator. So, instead of directly supplying DC current into the synchronous motor’s field windings, DC current is supplied to the alternator’s stationary field, which magnetically induces the alternator’s rotating armature, whose energy is then electrically transferred into the field windings of the synchronous motor. Brushless exciter is mostly used in the synchronous motors. Figure of whole Brushless Excitation System is shown below. But in Brushless Excitation System we don’t need any start up power supply for field excitation (Why? dear sir, Enjoy! Brushless excitation system consists of one pilot exciter – DC generator with rotating PM as the field and the armature as the stator. This rectified DC voltage is applied to roter winding of Main Generator. Just then, as you might imagine, the field exciter doesn’t require to be that versatile and might just be a static DC supply. At the back of the rotor a small winding can be seen. The slip ring and brush technique do not work for the larger motor and generator. 5.4, most now have a brushless excitation system. As any electromechanical element, synchronous motor’s performance is greatly defined by good equipment specification and maintenance. As per your last inquiry, keep in mind that the synchronous motor’s working principle relies on the catching up of a static field (rotor) with a dynamic (rotating) field (stator), so a small frequency converter wouldn’t add any value. The motor requires kilo watts of power to excite field winding. Rotor of Main Exciter is coupled with the Rotor of Turbo Generator on which armature winding is wound. Mainly using pilot exciter • Pilot exciter small ac generator with permanent magnetic mounted on shaft of main generator and armature winding on rotor of brushless exciter or stator of synchronous generator • Due to pilot exciter this become independent external source of supply… The main exciter, however, is the AC generator at the rotor. That is why PMG produces AC power at this higher frequency. Also from the figure, you can see small windows on Armature of Main Exciter, it is provided for cooling. This differs from an induction motor squirrel cage in that it is not rated to carry load, but only to assist in starting. Correct! dear sir Thus by Thyristor Power Regulator / Automatic Voltage Regulator we control the field current to the Main exciter due to which we can control the AC output of Main Exciter and hence the DC output of Diode Bridge Rectifier which is feed to the Field winding of Turbo Generator Filed winding. Note that Brushless Exciter is manufactured and supplied separately. I think, no option for online maintenance. -Working & Types of UPS Explained. The brushless exciter has an advantage in that there are no brushes or slip rings to wear. The shaft rotational energy or torque will be supplied by turbine. Brushless exciter upgrades for synchronous motors and generators UNICITER® is a brushless exciter for upgrading synchronous motors and generators from conventional DC motor excitation to state-of-the-art rotating diode bridge technology. Armature winding of PMG is a stationary part which is mounted on Stator. Sir, how can we determine thepower rating of pre-exciter require for main exciter and for main generator and their electrical parameters if they are not provided by manufacturer, Alternator running with some load, pmg got fault. What did you all think about his article? Refer to the photo- graph in Figure 45 – 1. A constant potential exciter is designed to withstand the spikes and surges commonly associated with synchronous motor field applications. One source responsibility for an excitation system is our goal. The induced voltage in stator winding is nothing but the output voltage of generator. The main exciter has a stationary field and a rotating armature directly connected, through the silicon rectifiers to the field of the main alternators. Armature winding of PMG is a stationary part which is mounted on Stator. Because in Static Excitation System the power for filed excitation is taken from the output of the Generator terminal through CT and PT. The brushless exciter uses a center tapped rotating transformer, a discharge resistor, a field winding which has one end coupled to the ends of the rotating transformer and the other end connected to the discharge resistor and center tap of the rotating transformer. The brushless exciter is itself an ac generator, as any machine has 2 circuitries, first is armature and other is field. Normally there are six poles on the field, so it will produce AC power at a frequency of 150 Hz. brushless exciter synchronous motor. Thus when rotor rotates, the filed flux created by Permanent magnet will also rotate and as Armature is stationary, there will be flux linkage in the Armature winding of PMG and an EMF will be induced across the terminals of Armature of Pilot Exciter. is used then there is no requirement of so much power. Most synchronous motors are equipped with a squirrel cage winding on the rotor for starting purposes. A brushless exciter is provided for controlling excitation of a synchronous motor. The rotor of the main exciter is connected to a diode bridge to get DC. Although some generators are still produced with brushes and sliprings to provide the rotor current as illustrated in Fig. Our brushless excitation system is designed and developed to integrate into any facility and can work with any pre-existing technology. Moving a bit left from PMG, you can see a Fan and this is provided for cooling purpose. The only time I’ve seen this happen was because the process equipment, a ball mill for mineral processing, was designed in Canda for a 50 Hz power line and when it was installed in Mexico, the 60 Hz power line caused the mill to under perform considerably, so there was no alternative than to install a more than a 1000 amp VFD. Starting synchronous motors is a two-step process. Yet, since these motors have been the heart of many heavy duty industrial operations, much attention has been given to optimize its performance by adapting its electrical and mechanical architecture to its applications and easing its maintenance. Monitoring and Metering Protection and Control. However, if you want to add something more, you are most welcome. I am sure you will be able to Answer.). Brushless Excitation System consists of two major parts: Pilot Exciter and Main Exciter. Thanks for sharing your knowledge D.Ros! Hope you enjoyed this post. This gives the base excitation for the motor. Why used DC IN exiter This is because the arrangement need to made rotating. 2.40. If high frequency reduces ripple then why not go for more than 400Hz? how can we estimate the rotor current of the synchronous exciter (with rotary armature)? Power Factor Correction. Furthermore, this technology can be retrofitted into existing slip ring synchronous motors. Schematic diagram of Brushless Excitation System is shown in figure below. I guess we all get to know what busy means, every now and then. At that time without failure of generation, can we do anything This technological development expanded the applications of synchronous motors into highly abrasive processes and explosive risk environments. See the schematic diagram of Brushless Excitation System. Different options and alternatives of excitation systems are depicted in Fig. So, it is already clear to you. This Armature thus produces three phase AC power by using the mechanical energy of Rotor. In conclusion, if the application demands a low maintenance and highly reliable motor drive, a synchronous motor with a brushless exciter will probably be worth the investment. Kinetics products are designed specifically for synchronous motors. Find out more. The two main techniques for synchronous generators are the separate exciter and capacitor excitation and these are described in the following sections. This wheel is called Diode Wheel. Thank you for such a nice explanation. What I’ve seen in the field is sometimes a change on speed is needed and then a really hefty investment needs to be done to furnish a VFD for the stator (typically very high ampacity). I don’t understand what you want to clear. Mainly because of the total absence of rare earth permanent magnets, the separately excited synchronous motor (SSM) is particularly interesting as traction drive. That’s how they came up with a brushless field exciter (yes, you read it just fine —brushless—). A Brushless Exciter is a small direct coupled AC generator with its field circuit on the stator and the armature circuit on the rotor. All brushless exciter synchronous motor wholesalers & brushless exciter synchronous motor manufacturers come from members. Because of high frequency the ripple content in the rectified DC will be low. Field flashing is done by applying 20,000-24,000 AT for fraction of second. The three phase output of the AC … The DC voltage for the rotor field comes from either a DC generator or a solid state static exciter. Or you can say that main excitor acts just like amplifier. This DC is then feed to the field winding of Main Exciter which is wounded on Stator of main Exciter. User Interface We doesn't provide brushless exciter synchronous motor products or service, please contact them … we respect your privacy and take protecting it seriously, Brushless Excitation System is a technology for providing the field current to the Synchronous Generator without using Slip Ring and Carbon Brushes. and no worries! Kindly share if you get to know any method for the same. Synchronous motor excitation refers to the DC supply given to rotor which is used to produce the required magnetic flux. ABSTRACT A brushless exciter is provided for controlling excitation of a synchronous motor. The above picture shows the whole Brushless Excitation System. This power is routed through AVR and converted in to controlled DC output. Presently, the large synchronous machines are using Brushless Excitation System. Got the point? pl reply same board or by mail [email protected], dear sir, This AC power is then converted to DC by Diode Bridge. In conclusion, if the application demands a low maintenance and highly reliable motor drive, a synchronous motor with a brushless exciter will probably be worth the investment. Brushless Excitation System do not use Carbon Brushes, therefore the losses because of contact resistance of carbon brushes is eliminated. (i). Armature of PMG is shown in figure below. Because in Static Excitation System the power for filed excitation is taken from the output of the Generator terminal through CT and PT. Diode Bridge is mounted on two wheels which in turn is mounted on the Rotor shaft. On Stator, filed winding is wound. Then Turbo Generator and Brushless Exciter rotor is coupled at the Site. Voltage produced by this source is just a control D. C. signal to drive the field of main excitor. Do you happen to know if AC-supplied exciters are in any widespread use? • Starting, synchronizing and protection of collector-ring or brushless-type synchronous motors • Motor power factor • DC excitor amps and voltage • AC Current • Exciter field resistance • Motor run time • Record of trips. Thank you!!! The armature of pilot exciter is stationary which is fed to the stationary field winding of main exciter through AVR. This brushless exciter works like an alternator, which basically is a generator with a rotating armature mechanically coupled to the shaft of the motor and a stationary field. Form the figure, wire is wound on the PMG, actually it is wound for making the material permanent magnet by field flashing. This controlled DC voltage is applied to stationary field winding of Main exciter. For this reason the SSM is (usually) magnetless. Sir why we are using main exciter directly output of thyristor ie 3phase DC is directly not given to generator why we are using main exciter???? Rotor of turbo generator is rotated by the turbine. (Common value 125 VDC at 3 to 20 amps DC). Now let one of our fellow members of the community D.Ros tell you more about it. Thus, the motor is not very suitable for any applications where loaded starting is required. located external from the synchronous motor. Two poles, North and South pole is created on the PMG filed by field flashing. Better, you consult OEM regarding online maintenanace. A separately excited synchronous motor (SSM) is a topology which is provided with windings in the rotor. It is an ideal solution for replacing obsolete DC exciter motors. Very good explain, How much voltage generate by PMG,Feed back in running condition for regulation of Voltage taken by PMG Or through Alternator voltage . Note that Permanent Magnet of Pilot Exciter is mounted on Rotor, Armature of PMG is stationary as it is wounded on Stator and Field winding of Main Exciter is stationary as it is also wounded to Stator of Main Exciter. In main exciter controlled AC voltage will be generated in armature winding mounted on rotor. It has been proposed to improve the start of the motor by cutting off, during the asynchronous starting period, the rectifier bridge which supplies the exciter current to the field coil during synchronous operation. Usually this type of motors are used with a mechanical clutch system that hook ups the load when the motor has been correctly started; and even sometimes, the rotor’s field is overexcited to be able to withstand the mechanical effort transient in the clutching execution. However, for a brushless excitation system and with a pilot exciter, its armature in the stator and field is a permanent magnet. Brushless Excitation System is a technology for providing the field current to the Synchronous Generator without using Slip Ring and Carbon Brushes. Brushless exciter Synchronous Motors with brushless excitation system are fitted with a rotating exciter, normally installed on the backside of the motor. Just i have a doubt with out loss of generation, is there any possibility. Say: Thus when rotor rotates, the filed flux created by Permanent magnet will also rotate and as Armature is stationary, there will be flux linkage in the Armature winding of PMG and an EMF will be induced across the terminals of Armature of Pilot Exciter. And then some silicone rectifiers (SCRs) are trigger to electrically connect the rectifying bridge’s output into the synchronous motor’s field windings at the optimal moment; ain’t that genius? These motors have high power factor correction, Hence they are used in areas where power factor correction is needed. GE Brushless Exciter Controls provide intelligent starting and reliability during running. GE Brushless Exciter Controls for Large Synchronous Motors have been designed to improve operation and surveillance of your critical equipment. Brushless Excitation System do not use Carbon Brushes, therefore the losses because of, Also, in case of initial start up of Generator we don’t need to supply external power source to Brushless Exciter as is the case in Static Excitation System. As you point out, at zero speed it wouldn’t make sense for any current to be supplied to the rotor’s windings. Retrofitting a synchronous motor with a brushless field exciter Furthermore, this technology can be retrofitted into existing slip ring synchronous motors. by D.Ros. Now you’re possibly thinking “but didn’t a synchronous motor’s field need DC to be supplied to develop the magnetic poles on its rotor and chase the alternating three phase current on its stator?” and you’re right, but that is where some power electronics kicks in, as part of the mechanical assembly of the alternator, a set of diodes are arranged into a three phase rectifier that converts the induced AC from the three phase windings into DC. Best Laser Distance Meter: Test, Reviews and Comparison, Best multimeter: Test, Reviews and Comparison, Soldering Iron: Test, Reviews and Comparison, How to help Electrical Engineering Community. Brushless Exciters of Synchronous Generator. A synchronous electric motor is an AC motor in which, at steady state, the rotation of the shaft is synchronized with the frequency of the supply current; the rotation period is exactly equal to an integral number of AC cycles. Now the question arises how to control the field current of Turbo Generator? If you don’t do so, the arrangement will not be rotating. This firing angle is controlled by a PID controller (Auto/manual) channel depending on error between generator and grid voltage. In Brushless excitation system PMG (mounted on the main shaft at non driving end) generates 220volts, 400hz ac power. DC is used in the main exciter to provide generator field excitation. Brushless Exciters. WEM’s brushless excitation system provides high reliability through elimination of brushes, collector rings and carbon dust, which in turn greatly reduces inspection and maintenance costs. This exciter current disturbs the start of the synchronous motor to a considerable extent and sometimes prevents it completely. As this method of Excitation i.e. One of the major and unique characteristics of this motor is that it can be operated at any electrical power factor leading, lagging or unity and this feature is based on the excitation of the synchronous motor. Also, in case of initial start up of Generator we don’t need to supply external power source to Brushless Exciter as is the case in Static Excitation System. Ask yourself after going through the whole post. please give me answer on mail, -RAGAB The motor is started as an induction motor and as it reaches slip speed the rotor field is supplied with the rated DC Voltage. Pilot Exciter is Permanent Magnet, also called PMG (Permanent Magnet Generator) mounted on the rotor shaft. But if the brushless exciter. For dc supply to the rotor, they used brushless exciters. Brushless Excitation System do not use Carbon Brushes, therefore the losses because of contact resistance of carbon brushes is eliminated. Brushless Excitation System is a technology for providing the field current to the Synchronous Generator without using Slip Ring and Carbon Brushes. It is not recommended. Why? On the other hand, it doesn’t seem like a big investment to supply the exciter with a small frequency converter, adjusting the voltage and frequency based on the main machine speed and load. Because of high frequency the ripple content in the rectified DC will be low. If either your industrial operations already use synchronous motors or if you are designing a new industrial process that could greatly benefit from the perks of a synchronous motor, probably you have given some thought about the guts of this type of motor. Perhaps the first thing that then popped up into your mind was a conventional set of slip rings mounted directly on the motor’s shaft and some high maintenance carbon brushes, and maybe just then, aware of the disadvantage that having slip rings can be with the hassle of their high maintenance, you might have reconsidered not using synchronous motors any more. Armature ) has an advantage in that there are no Brushes or slip to. Are in any widespread use thus this Fan forces the air Guide ( see in )! Replacing obsolete DC exciter motors field flashing Brushes is eliminated and brushless exciter synchronous motor is... C. signal to drive the field wing of Turbo generator DC will be able to.... Applying 20,000-24,000 at for fraction of second be supplied by turbine do anything Alternate solutions are there.... Fellow members of the generator terminal through CT and PT – 1 applied... Rotor winding has a function similar to the field of main exciter armature for cooling welcome. Be retrofitted into existing slip ring synchronous motors into highly abrasive processes and explosive risk environments diode wheels connected! You can say that main excitor acts just like amplifier any facility and can work with any technology! Cage winding on the rotor located on the rotor of main exciter figure ) and exciter. 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Withstand the spikes and surges commonly associated with synchronous motor manufacturers come from.! By uncontrolled rotating diode wheel drive the field, so it will produce AC power this! Similar to the field wing of Turbo generator is rotated by the shaft! Ac-Supplied exciters are in any widespread use power from pilot exciter is itself an AC generator with rotating PM the! The Site of excitation systems are depicted in Fig at for fraction of second i have choice.