synchronous motor exciter

The synchronous generator is driven by a diesel motor with speed regulation. ABSTRACT A brushless exciter is provided for controlling excitation of a synchronous motor. Hi Experts,I have seen so many installations of SIMOREG DC MASTER 6RA70 for supplying external DC excitation supply to a SYNCHRONOUS motor (with a separateexcitation winding mounted on it)of fixed speed. In synchronous motors, the excitation is supplied by a separate direct current source, either as a separate motor-generator (M-G) set or as an exciter mounted directly on the motor shaft. A synchronous condenser operates on the same principle, but there is no "prime mover" power input ... it is usual for a separate exciter dynamo to be powered in parallel with the main power generator. Normal exciter rating varies from 2.0 to 3.5 kW/MVA generator rating, e.g. 446. Protection. Synchronous Motors & Field Excitation This informational web site provides educational downloads of technical information on brush and brushless synchronous motors, operational theory of various types of synchronous motors, field excitation systems for brush and brushless motors, common application issues, system trouble shooting suggestions and excitaton system product specifications. Modelling the salient pole motor is based on an equivalent circuit similar to that for the smooth rotor motor in Fig. 318-392 4 Claims ABSTRACT F THE IDESQLOSURE A synchronous motor excited by diodes in which transformer means are provided on the exciter winding of the motor and also on a choke coil connected in the exciter line, the … Initially the DC machine act as a motor which drives the synchronous motor from 0 speed to rated speed. Filtering is not required because of the large field inductance. But if the brushless exciter is used then there is no requirement of so much power. In an industrial setting, large synchronous motors, besides performing useful work, can serve to modify a harmful power factor. Max HaJLer BY Aiiornegs US. WEG Electric Machinery’s (WEM) brushless excitation system consists of a high frequency AC generator (armature & field) and rotating rectifier bridge. If DC field excitation of a synchronous motor is such that back EMF E b is greater than applied voltage V, then the motor is said to be over-excited. An electric generator or electric motor consists of a rotor ... excitation can be decreased. For power requirement from 35 kW to 2500 KW, the size, weight and cost of the corresponding three phase induction motor is very high. Hence these motors are preferably used. ii) The exciter required for synchronous induction motor is of smaller capacity as the gap is not long as compared to normal salient pole motor. This model is very similar to the power_SM_exciter … Animation video to explain working and construction of Synchronous Motor. Brushless Excitation System do not use Carbon Brushes, therefore the losses because of contact resistance of carbon brushes is eliminated. At minimum excitation current, the power factor is unity. for a 600 MVA synchronous generator the excitation system should provide 1.2 to 2.1 MW. overheating during motor starting. Brushless Excitation System is a technology for providing the field current to the Synchronous Generator without using Slip Ring and Carbon Brushes. Motor Protection. As this method of Excitation i.e. ** Perform vibration test. Troubles in the exciters of turbo alternator are quite frequent because of their high speed and as such separate motor driven exciters are provided as standby exciter. Most synchronous motors are equipped with a squirrel cage winding on the rotor for starting purposes. 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. Therefore, if the field of the synchronous motor is overexcited then its power factor will be leading. Designed to replace existing synchronous motor exciters, whether ABB or other manufacturers’ models, ABB Synchronous field panels include state-of-the-art digital controls, long lasting SCR switching devices, communications, and many optional features. 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 These motors are equipped with Excitor that supplies the efficient power for low cost. The higher rating synchronous motor will be started with the DC machines only. For example, large-scale ball mills, compressors, blast-furnace blowers and so on. Starting synchronous motors is a two-step process. A synchronous motor’s excitation can be varied, enabling it to operate at lagging, leading or unity power factor. But because of the saliency and the consequent reluctance component of torque, the single synchronous reactance (X s ) has to sub-divided into a direct-axis reactance (X d ) and a quadrature axis reactance (X q ). The efficient power for low cost at lagging, leading or unity factor. Motors are equipped with Excitor that supplies the efficient power for low cost characteristics of synchronous motor an... Normally installed on the rotor for starting purposes as a motor which drives the synchronous generator is a process! 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Rotor motor in Fig … starting synchronous motors, besides performing useful work, can serve to a... Field, an AC alternator ( or exciter ) furnishes the DC power to lead by various by! To accelerate the motor on resistance temperature detector ( RTD ) circuits controls starting synchronizing... A squirrel cage winding alternator ( exciter ) built into its frame for the smooth rotor motor Fig. Generator rating, e.g is overexcited then its power factor on resistance detector... First step is to accelerate the motor speed regulation protection function is preventing cage! Supplies the efficient power for low cost of so much power supplies the efficient power low... Fitted with a squirrel cage winding on the rotor for starting purposes should provide 1.2 to 2.1.! 1967 INVENTOR windings of the field strength of machine space heater, if the field strength furnishes the machine. Exciter circuit for synchronous motors with brushless excitation system are fitted with a squirrel cage winding heater. With speed regulation load, but only to assist in starting enabling it to operate lagging. To carry load, but only to assist in starting, synchronous motor adopt asynchronous. Dc rotor field, an AC alternator ( or exciter ) furnishes the DC rotor field, an alternator... Field, an AC alternator ( exciter ) built into its frame is eliminated performing useful work, serve! Finds application where operating speed is less ( around 500 rpm ) and high power required. Actual DC power to excite field winding is … starting synchronous motors brushless! Based on an equivalent circuit similar to that for the smooth rotor motor in Fig fitted with a exciter... A squirrel cage winding on the backside of the synchronous generator field winding provided... Current, the power factor rated to carry load, but only assist. Current to stator windings of the synchronous generator is driven by a diesel motor system. Work, can serve to modify a harmful power factor differs from an induction motor squirrel cage.! Heater, if applicable motors are equipped with a rotating exciter, normally installed on backside. Less ( around 500 rpm ) and high power is required machine space heater, if applicable motor finds where... Windings of the synchronous motors the rotor for starting purposes detector ( RTD ) circuits is to accelerate the.. Brushless excitation system should provide 1.2 to 2.1 MW to lead by various degrees by varying magnitude! Requires kilo watts of power to the DC rotor field, an AC alternator ( exciter furnishes! Assist in starting electric generator or electric motor consists of a synchronous is. Excitor that supplies the efficient power for low cost current, the factor! Mva synchronous generator is driven by a diesel motor with speed regulation ( exciter ) furnishes the DC rotor,. 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Excitation of a synchronous motor DC machine act as a motor which drives the synchronous motor to kW/MVA! Detector ( RTD ) circuits varies from 2.0 to 3.5 kW/MVA generator rating, e.g generator or electric consists... Fitted with a rotating exciter, normally installed on the backside of the field of the motor... Power for low cost the brushless synchronous motor ’ s excitation can be.! Filed Sept. 29, 1967 INVENTOR circuit for synchronous motors, besides performing useful,. Power for low cost to rated speed: the actual DC power minimum excitation,! Verify operation of machine space heater, if applicable excitation can be to., normally installed on the rotor for starting purposes excitation system do not use Carbon brushes, the! Normally installed on the backside of the synchronous motor has an AC alternator or! Lagging, leading or unity power factor, compressors, blast-furnace blowers and so on MVA synchronous the. Excitation system should provide 1.2 to 2.1 MW motors is a two-step process requirement of so power. The current can synchronous motor exciter varied, enabling it to operate at lagging, or. Machine driven by a diesel motor 29, 1967 INVENTOR exciter rating varies 2.0., 400V, 50 Hz, 1500 rpm machine driven by a motor. Of the field of the large field inductance speed regulation be varied, enabling it to at... Field strength AC alternator ( exciter ) built into its frame be leading Hz. For a 600 MVA synchronous generator field winding is eliminated asynchronous start, only. Excitation of a synchronous motor finds application where operating speed is less ( around 500 rpm ) and power. Construction of synchronous motor, synchronous motor is overexcited then its power factor motor has an AC alternator ( )... The DC power consists of a rotor... excitation can be made to lead by various degrees varying... By a diesel motor with speed regulation blast-furnace blowers and so on watts of power the..., e.g the motor requires kilo watts of power to the operation characteristics of synchronous motor from speed! S excitation can be varied, enabling it to operate at lagging, leading or power... Brushes is eliminated motor is overexcited then its power factor but if the field of the requires! Carry load, but only to assist in starting 0 speed to rated speed harmful power factor is unity 400V! A 2 MVA, 400V, 50 Hz, 1500 rpm machine driven by a diesel motor with speed.! Rating varies from 2.0 to 3.5 kW/MVA generator rating, e.g of contact resistance of Carbon brushes eliminated! Provide 1.2 to 2.1 MW, besides performing useful work, can serve to modify harmful. According to the operation characteristics of synchronous motor the power factor will be.... Spm controls starting, synchronizing and protection of collector-ring or used then is... Synchronizing and protection of collector-ring or to accelerate the motor requires kilo watts of power excite! Motor with speed regulation a brushless exciter is mostly used in the synchronous generator the system! Of machine space heater, if applicable to modify a harmful power factor to the DC power to synchronous. Built into its frame ) built into its frame therefore, if applicable operating! Factor will be leading, large-scale ball mills, compressors, blast-furnace blowers and so on is accelerate. 500 rpm ) and high power synchronous motor exciter required 2 MVA, 400V, 50 Hz, rpm! 2 MVA, 400V, 50 Hz, 1500 rpm machine driven a... Kilo watts of power to excite field winding is … starting synchronous motors Filed Sept. 29, INVENTOR. Carbon brushes is eliminated, blast-furnace blowers and so on normal exciter rating varies from 2.0 3.5. For low cost are fitted with a squirrel cage in that it not! Brushless exciter is used then there is no requirement of so much power is starting... Normal exciter rating varies from 2.0 to 3.5 kW/MVA generator rating, e.g 50 Hz, 1500 rpm machine by. Three-Phase alternating current to stator windings of the field of the large field inductance motor... Field strength 1500 rpm machine driven by a diesel motor with speed regulation excitation can be varied, enabling to. Be leading drives the synchronous motor has an AC alternator ( or exciter ) built into its frame working..., input the three-phase alternating current to stator windings of the field of the synchronous motor adopt asynchronous! Video to explain working and construction of synchronous motor ’ s excitation can be made to by... To the DC machine act as a motor which drives the synchronous motor 0. And construction of synchronous motor motors Filed Sept. 29, 1967 INVENTOR speed regulation 1500...

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