H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/24
H02P 3/10 (2006.01) C07C 2/42 (2006.01) C07C 45/00 (2006.01) C07C 45/42 (2006.01) C07C 45/46 (2006.01) C07C 45/49 (2006.01) C07C 45/51 (2006.01) C07C 45/56 (2006.01) C07C 47/546 (2006.01) C07C 49/792 (2006.01) C11B 9/00 (2006.01) G05B 11/06 (2006.01) H02P 6/24 (2006.01)
Patent
CA 1164931
ABSTRACT OF THE DISCLOSURE A stop control circuit for a DC motor causes the motor to stop precisely by purely electrical action. A DC motor is provided with a bidirectional driving circuit, a servo circuit for controlling the driving circuit, and a rotation detector associated with the for shaft to provide a phase signal that depends, in magnitude and polarity, on the particular rotational angle of the shaft, regardless whether the motor is turning. A stop control circuit then includes an amplifier whose output varies according to the phase signal, and a switch that normally provides the servo signal to the driving circuit, but, upon command, switches over to provide thereto the output of the amplifier as a brake signal. Alternatively, the rotation detector can include two sensor elements separated by Image and the stop control circuit can include an inverting amplifier, a non-inverting amplifier coupled to one of the sensor elements, and a switch circuit with inputs coupled respectively to these amplifiers. A comparator provides a switch signal to the switch circuit in dependence on the phase signal from the other sensor element. In another embodiment, a differential amplifier provides a brake signal in dependence upon both the phase signals from the two sensor elements.
378559
Sakai Masaaki
Yoshihiro Mitsugu
Gowling Lafleur Henderson Llp
Sony Corporation
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