Method of controlling the speed of a D.C. motor and device for c

Details Method of controlling the speed of a D.C. motor and device for c Method of controlling the speed of a D.C. motor and device for c

1987-12-14

1991-04-02

Weldon, Ulysses

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Analog armature control

3889281, H02P 5165

Patent

active

050052071

ABSTRACT:
A device for controlling the speed of a d.c. motor (M) employs a method in which the motor supply voltage (V) is controlled by a control voltage (Vo) supplied by a comparator circuit (11) which compares a reference signal (S.sub.ref) with a signal (S.sub.V) representing the motor speed. The signal (S.sub.V) is derived from a signal (S.sub.M) induced by the motor rotation via a signal processing circuit (21). The motor supply voltage (V) is controlled by the control voltage (V.sub.o) by means of a negative resistance circuit (31) (-R), which at least partly compensates for the internal resistance (r) of the motor.

REFERENCES:
R. Boylestad et al., "Electronic Devices and Circuit Theory", Prentice-Hall, Inc., Englewood Cliffs, N.J., 1972, pp. 535-540, 552-557.

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