Sensorless switched reluctance motor
Estimator initialization circuit and method for a sensorless switched reluctance machine system Patent #: 5689165
ApplicationNo. 013228 filed on 01/26/1998
US Classes:318/701, Hysteresis or reluctance motor systems318/254SELF-COMMUTATED IMPULSE OR RELUCTANCE MOTORS
ExaminersPrimary: Shoop, William M. Jr.
Assistant: Leykin, Rita
Attorney, Agent or Firm
International ClassH02P 001/46
Foreign Application Priority Data1997-11-10 KR
AbstractA sensorless switched reluctance motor (SRM) driving apparatus comprising: a phase control unit for outputting a start or stop command signal for the SRM and a speed command signal to set rotation speed thereof; a phase detecting circuit for outputting a phase current signal after measuring the phase current transmitted to the SRM; a digital firing angle estimating unit for outputting a rotor phase signal to supply the current to a specific phase of the rotor if the arrangement command signal is input, and for outputting a rotor phase signal after measuring a SRM firing angle by comparing a phase current signal and a reference phase converting period signal as a pulse signal is applied to a phase previously magnetized when the SRM has been rotated; a speed control unit for sending an arrangement command signal to the digital firing angle estimating unit if an operation start signal is input from the phase control unit, for outputting a voltage command signal to control the SRM rotation speed in response to the speed command signal from the phase control unit and the phase converting period signal from the digital firing angle period estimating unit, and generating and inputting a reference phase converting period signal to the digital firing angle estimating unit; an inverter driving unit for generating a pulse width converting signal according to the digital firing angle estimating unit input from the speed control unit and for performing a logic combination of the pulse width converting signal and the rotor phase signal input from the digital firing angle estimating unit to send a SRM phase magnetizing signal; and an inverter for transmitting a voltage to the SRM in compliance with the phase magnetizing signal from the inverter driving unit, whereby the phase current signal detected by inputting a short pulse to an unused phase discriminates whether the rotor phase leads or lags, and whereby the voltage and phase converting period are estimated to accurately detect the firing angle without being influenced by the electric noise and mechanical noise.