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Synchronous Motor Field Excitation Systems PDF

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Brushless Type Synchronous Motors

Kinetics Industries, Inc.
Kinetics Model Type KNB1 Exciter Regulator

The Kinetics model type KNB1 exciter regulator is a single phase input, hybrid bridge, SCR regulated rectifier specifically designed for the application of providing regulated DC output to the field of a rotating exciter on the common shaft with the motor rotor. (Specialty units are available in three phase configurations, KNB3)

The KNB1 exciter has been designed to regulate the output voltage of the unit by controlling the DC voltage applied to the motor field. The unit maintains the output voltage regardless of the load conditions, within the limits of the rectifier. The unit makes use of an internally connected voltage feedback loop signal to provide for regulating load current proportional to either a local or remote Reference signal. Units are also available with the feedback mode closed on output current, power factor, tachometer generator signal or a customer supplied signal. Units can be configured to accept an external signal of either 4-20 milliamp or 0-10 volt DC.

The KNB1 exciter has been designed for maximum flexibility and application versatility. The space efficient design has been configured to fix into the available space of a standard switchgear, motor starter or motor control center enclosure.

Cautionary application note: The various manufacturers of brushless synchronous motors, have different configurations of rotating excitation system circuitry. When applying an off shaft exciter, it is imperative that the off shaft exciter be compatible with the on shaft exciter field application circuitry. Kinetics has developed an extensive engineering archive of on shaft "circuitry" found on domestic and offshore manufactured motors. Kinetics has an on-going working OEM relationship with the majority of brushless synchronous motor manufacturers within the US market place. Kinetics' engineers are available to assist in selecting the correct off shaft exciter configuration.

Standard / stock package:
      Input 120 or 240 volts
      Output 125 VDC at 10, 15 or 20 ADC nominal.
      Other AC inputs and DC outputs are available upon request.

All EPT transformers and circuitry, in Kinetics product, is manufactured in-house by Kinetics. We have the manufacturing control to supply units to international and non-standard voltages and currents without sacrificing delivery lead time or costing control.

The basic Kinetics KNB1 brushless motor exciter:

  • AC input discount.
  • Isolation EPT transformer with below nominal taps.
  • Single phase rectifier bridge consisting of two SCR and two diodes mounted to a conservatively rated heatsink.
  • Free-wheeling diode across the rectifier output.
  • Kinetics SCR firing and referencing circuit.
  • AC & DC surge suppression networks.
  • Output voltage adjustment potentiometer.
  • Linear ramp to full output "soft" turn on.
  • DC current limit and immense over current protection.
  • Terminal points for a DC ammeter & voltmeter.
  • Operational test switch.
  • Open panel construction: 18"W x 18"High x 10"D

Application interface features available options:

  • KinetSync-NB digital logic controller & annunciation module.
  • Interconnection cables with Molex plugs.
  • Power factor signal generation circuit.
  • Field forcing.
  • Interface for operation from a tachometer generator signal.
  • Current regulated feedback loop.
  • Stand alone heavy industrial enclosure.

Information needed for a quotation:

  • AC input available; volts/phase(s)/hertz.
  • DC output required: volts / amps.
  • Motor manufacturer.
  • Mode of regulation desire; volts or current or power factor or other.
  • Open panel or in an enclosure.
  • Does the application require digital logic control, annunciation and/or remote communication
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