Electronic tachometer and combined brushless motor commutation a

Details Electronic tachometer and combined brushless motor commutation a Electronic tachometer and combined brushless motor commutation a

1978-05-26

1980-10-14

Strecker, Gerard R.

Electricity: measuring and testing

Electrical speed measuring

Including speed analog electrical signal generator

318272, 318313, 318463, 324165, 324171, 324175, 4005834, 400611, G01P 344, G01P 1300, H02P 308, H02P 602

Patent

active

042283965

ABSTRACT:
An electronic tachometer utilizes a transducer, typically an optical encoder disc, connected to a movable mechanical element. The transducer produces a pair of triangular waves of fixed relative phase, each having slopes proportional to the velocity of the mechanical element. The triangular waves are differentiated and the resultant signals are sampled by gating pulses derived from the triangular waves themselves. The samples are combined to produce an output signal having a magnitude proportional to element speed and a polarity indicative of direction.
In a combined system in which the transducer is attached to the shaft of a brushless motor, another output of the same transducer is used for commutation control of the motor stator windings. This arrangement is particularly useful in a velocity servo system, in which the tachometer output is compared with a signal indicating desired motor velocity. The comparator output is used to modify the commutation control so as to produce the desired motor velocity. Position encoding also may be accomplished using the same transducer.

REFERENCES:
patent: 3477022 (1969-11-01), Le Masters
patent: 3603869 (1971-09-01), Neuffer
patent: 3882402 (1975-05-01), Jensen
patent: 4025934 (1977-05-01), Hartmann
R. S. Palmer and D. W. Rickert-Optical Tachometer with Switch Circuitry-IBM Tech. Disc. Bul.-vol. 16, No. 4, Sep. 1973.

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