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Synchronous Motor Field Excitation Systems PDF

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Brush Type Synchronous Motors
Constant Potential, Non-Regulated

Brush Type Synchronous Motors Constant Potential, Non-Regulated

A diode rectifier is the lowest cost and most simplistic type of exciter. This type of exciter is a combination isolation transformer with numerous taps and a non-regulated diode rectifier. The voltage output of the rectifier is a direct ratio of AC input to DC output. The exciter output voltage can only be adjusted by changing transformer taps. The current passed to the field is a function of the exciter voltage and field resistance (Ohm’s law E=IR). The transformer taps can only be changed with the motor and exciter off line. Standard taps provided are five 5% full current capacity taps below the nominal voltage. Total of six taps provided. Kinetics manufactures all our own transformers, with copper conductor as our standard, from 1 to 2000 KVA up to 15 KV class. Providing additional taps to the primary or secondary of the transformer is an available customer option.

A full current rheostat can be added to the output of a diode rectifier for manual voltage adjustment to the motor field. In many cases the cost of adding a rheostat exceeds the cost of a SCR regulated rectifier.

Depending on the field application control scheme, a CP exciter may or may not be applicable. Care needs be taken to assure compatibility between the exciter and field application controls.

Kinetics Industries Brush Type Synchronous Motors

"CP" exciters tend to be used on motors below 500 Hp. Units are available for single phase or three phase input at a customer’s request.

The Kinetics models MVR & CVR are heavy duty, AC line regulated "CP" diode rectifiers designed and rated for highly inductive loads. A robust design enables units to withstand the spikes and surges commonly associated with synchronous motor field applications.

• Model MVR 1 to 20 KW in capacity at 125 or 250 VDC nominal
• Model CVR 22.5 to 2000 KW capacity

Units are with standard features of AC line protection, EPT exciter power isolation transformer, AC surge suppression, semi-conductor fusing, diode rectifier, DC surge suppression, DC bleed resistance, annunciation and enclosure or chassis assembly for mounting in a switchgear cell.

Kinetics exciter units are designed specifically for the high transient power spikes and surges associated with highly inductive loads. The rectifier is protected with robustly rated MOV surge suppressors, a DC bleed resistance and diodes with a minimum peak inverse voltage (PIV) rating of 8 times the AC RMS voltage into the diode primary.

"CP" exciter models MVR & CVR can be supplied as an excitation system when combined with Kinetics’ field application panel model SYNCHAPP-C for brush type motors and/or Kinetics’ KinetSync digital logic annunciation and control module.

Cautionary notes:
1) Diode rectifier exciters may not incorporate the use of solid state SCR switching for field application. A CP exciter field application method must be a contactor application system.
2) For retro-fit applications, where only the exciter is being replaced, the application control scheme must be confirmed to be suitable for a constant potential exciter. For application information, please reference our engineering library, of our web site, for a white paper titled: Application of Regulated & Non-Regulated Rectifiers to Synchronous Motor Field Excitation Applications

› Constant Potential, Non-Regulated
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Kinetsync-SR Kinetsync-NB
Complete Integrated Excitation System | Constant Potential, Non-Regulated | Regulated Voltage Output | Regulated Current Output
Regulated Power Factor / Voltage Output | Regulated Remotely Supplied Signal | KinetSync-SR Digital Annunciation Module
Regulated Exciter with KinetSync-SR | Regulated Exciter with SPM Application Relay | Contactor Applied Field Package