Control circuit for generating a speed dependent deceleration fo

Details Control circuit for generating a speed dependent deceleration fo Control circuit for generating a speed dependent deceleration fo

1995-11-15

1997-10-28

Wysocki, Jonathan

Electricity: motive power systems

Limitation of motor load, current, torque or force

49 28, H02P 300

Patent

active

056820895

ABSTRACT:
A control circuit for controlling the speed and stopping time of an electronically commutated motor having a rotary drive member and a stator having at least one phase coil, electric power being supplied to the phase coils by current supply elements which are controlled by the control circuit to obtain a given phase voltage and a given load angle during operation. In response to a supplied stop signal the control circuit decelerates the drive member by controlling the phase voltage and load angle so as to produce a deceleration force which changes dependent on the speed of the drive member; there being a high speed range over which the deceleration force increases to a maximum value as speed is reduced; an intermediate speed range over which the deceleration force remains substantially constant at the maximum value as speed is further reduced, and a low speed range over which the deceleration force reduces as speed is still further reduced to a stop. The intermediate range adjoins the low range at a speed at which the deceleration force which would result from direct short-circuiting of the phase coils would substantially reach a maximum value. A significantly reduced stopping time can be obtained.

REFERENCES:
patent: 3866100 (1975-02-01), Palenchar et al.
patent: 4090113 (1978-05-01), Ogishi
patent: 4145641 (1979-03-01), Ozaki
patent: 4271385 (1981-06-01), Azusawa
patent: 4563625 (1986-01-01), Kornbrekke et al.
patent: 4614902 (1986-09-01), Jessup
patent: 4713591 (1987-12-01), McCloskey
patent: 5220257 (1993-06-01), Yoshino et al.

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