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Synchronous Motor Field Excitation Systems PDF

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Brushless Type Synchronous Motors
Exciter & SPM Relay

The Kinetics model type ENB-SPM is a combination system of the Kinetics KNB1 brushless motor exciter regulator and SPM module. The ENB-SPM system provides sequencing of the control for interfacing with the internal motor controls to provide protection from incomplete sequence faults, motor running faults and annunciation of motor operational status. Kinetics can supply SPM modules as an OEM supplier with Kinetics KNB exciter regulator.

The SPM, as it is manufactured by another manufacturer, must be field programmed. The SPM manual should be consulted prior to application for product operational constraints. The SPM manufacturer recommends against using the unit in a power factor mode for some applications including but not limited to reciprocating compressors.

The Kinetics model type KNB1-SPM 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-SPM includes the required interface circuit to incorporate the use of a regulation signal from a SPM module.

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, tachometer generator signal or a regulation signal from the SPM. 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 manufactures of brushless synchronous motors, have different configurations of rotation 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 input and DC outputs are available upon request.

The Kinetics KNB1 includes:

  • 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

Optional features available:

  • Field forcing.
  • Heavy industrial enclosures.
  • Non-standard input or output voltage and current ratings.

Information needed for a quote:

  • SPM model type to be used in the project.
  • AC input available; volts/phase(s)/hertz.
  • DC output required: volts / amps.
  • Motor manufacturer.
  • Circuit diagram or instruction manual to the on shaft exciter electronics.
  • Mode of regulation desire; volts or current or power factor or other.
  • Open panel or in an enclosure.
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