Adaptive commutation delay for multi-pole brushless DC motors

Details Adaptive commutation delay for multi-pole brushless DC motors Adaptive commutation delay for multi-pole brushless DC motors

1992-02-24

1994-06-07

Ro, Bentsu

Electricity: motive power systems

Switched reluctance motor commutation control

H02P 602

Patent

active

053192893

ABSTRACT:
A circuit to provide adaptive commutation delay for multi-pole brushless DC motors. The circuit adjusts the commutation delay as a function of the rotational speed of the motor to maximize motor torque and minimize power consumption. Unlike the prior art, the circuit avoids the need for complex circuitry or external components. The circuit may be implemented entirely within a single integrated circuit. The circuit includes a back-EMF sensing input, an oscillator, a voltage holding and proportioning circuit, one or more comparators and, optionally, an external control circuit. The back-EMF sensing input controls the operation of the oscillator. The voltage holding and proportioning circuit processes the oscillator output and provides outputs which are compared by the comparators. The comparators produce commutation delay signals and, optionally, other signals. The circuit also allows adjustment to compensate for non-ideal back-EMF-to-rotor-position correspondence or fixed time delays inherent in the commutation process.

REFERENCES:
patent: 4442386 (1984-04-01), Uchida et al.
patent: 4551708 (1985-11-01), Welburn
patent: 4633150 (1986-12-01), Inaji et al.
patent: 4686437 (1987-08-01), Langley et al.
patent: 5019756 (1991-05-01), Schwarz
patent: 5028852 (1991-07-01), Dunfield

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