Braking method, braking circuit and speed control apparatus for

Details Braking method, braking circuit and speed control apparatus for Braking method, braking circuit and speed control apparatus for

1984-11-26

1986-12-30

Shoop, Jr., William M.

Electricity: motive power systems

Braking

'plugging' or application of reverse power to motor

318254, 318331, 318368, 318459, H02P 310

Patent

active

046331549

ABSTRACT:
A braking method for DC motor of the present invention is applied to a pulse-driven DC motor. A counter electromotive force of reverse polarity to driving pulses which is generated by induction at the winding of the DC motor is charged in a capacitor. The charged counter electromotive force is fed to the winding of the DC motor during the time that the driving pulses are not fed to the motor, so that plugging is applied to the DC motor. Thus, an external power source for plugging is not necessary, and power consumption is reduced and the construction of the braking circuit becomes very simple. Also, the driving period and the plugging period have a complementary relationship therebetween, thereby enabling the accurate controlling of the rotational speed of the DC motor with a very simple circuit.

REFERENCES:
patent: 3521139 (1970-07-01), Kendall
patent: 3748552 (1973-07-01), Arthur
patent: 3833846 (1974-09-01), Schmalzriedt

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