Controlling a multiphase brushless motor without position sensor

Details Controlling a multiphase brushless motor without position sensor Controlling a multiphase brushless motor without position sensor

1990-11-15

1993-07-27

Shoop, Jr., William M.

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318439, H02P 602

Patent

active

052313387

ABSTRACT:
A control circuit is used for driving a multiphase brushless DC motor. The back emf of a non-excited winding is sensed, and a control signal is generated when a sinusoidal signal on the winding crosses a reference voltage level. Commutation occurs when the control signal is generated. Masking circuitry inhibits sensing of back emf immediately after commutation for a time period which is sufficient to ensure that noise from commutation spikes has ceased.

REFERENCES:
patent: 4169990 (1979-10-01), Lerdman
patent: 4641066 (1987-02-01), Nagata et al.
patent: 4752724 (1988-06-01), Radziwill et al.
patent: 4922169 (1990-04-01), Freeman

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