Statistical phase detection and go start-up algorithm

Details Statistical phase detection and go start-up algorithm Statistical phase detection and go start-up algorithm

1997-06-30

2000-07-18

Sircus, Brian

Electricity: motive power systems

Synchronous motor systems

Hysteresis or reluctance motor systems

318254, H02P 146

Patent

active

060912227

ABSTRACT:
A method for starting a polyphase DC motor having a rotor. The position of the rotor is detected by initiating current in each of the phases of the motor and measuring a time period between the initiation of current in the coil and an instant when the current exceeds a threshold current. The phase in which the current reaches the threshold in the shortest amount of time is the phase closest to the position of the rotor. A phase closest to the position of the rotor is identified in each of an odd number of trials, and a starting phase is selected as the phase identified in the majority of trials. The motor is started by providing current to the starting phase.

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Acarnley et al., "Detection of Rotor Position in Stepping and Switched Motors by Monitoring of Current Waveforms," IEEE Transactions on Industrial Electronics, vol. IE-32, No. 3, Aug. 1985, pp. 215-222.

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