Brushless d.c. motor with precise speed control

Details Brushless d.c. motor with precise speed control Brushless d.c. motor with precise speed control

1977-04-07

1978-10-10

Hohauser, Herman J.

Electricity: motive power systems

Switched reluctance motor commutation control

318138, H02K 2900

Patent

active

041198956

ABSTRACT:
Speed control for a brushless d.c. motor is made independent of the effects of temperature and aging on the magnetic structure by triggering a rectangular wave pulse generator by voltages produced by the rotation of the motor through a coupling network that makes the trigger time correspond to a certain portion of the rise of voltage so that the influence of the amplitude of the signal on the trigger time will be negligible. The square waves are phase-shifted and integrated to produce a d.c. signal proportional to motor speed on which is superimposed a practically sinusoidal ripple and this signal is fed into a comparator to produce both an error signal from the d.c. component and a commutation control from the a.c. component. The speed is switched between desired precise values by an electronic circuit that controls the duration of the rectangular pulses and makes corresponding adjustments in the integrator and phase shifter.

REFERENCES:
patent: 3999108 (1976-12-01), Tanikoshi

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