RPM Sensor for electronic motor braking

Details RPM Sensor for electronic motor braking RPM Sensor for electronic motor braking

1981-10-16

1983-07-05

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Braking

318759, 318371, H02P 324

Patent

active

043920985

ABSTRACT:
The motor braking circuit for use with an alternating current motor and an AC power source includes a power circuit for supplying a DC braking current to the AC motor and a motor speed sensor which causes a mechanical brake to engage the AC motor and its load when the motor speed decreases to a predetermined value. The DC braking current is applied to start the electrical braking cycle as soon as the AC source is disconnected from the AC motor. The RPM sensor monitors the speed of the AC motor during the electronic braking cycle and causes the mechanical brake to engage the motor and its load when the motor speed decreases to a predetermined value to complete the stopping sequence. The AC motor braking system can be installed without any additional direct wiring or additional hardware to the AC motor.

REFERENCES:
patent: 3277357 (1966-10-01), Willis
patent: 3439245 (1969-04-01), Perdue
patent: 3665272 (1972-05-01), Spiess
patent: 3761790 (1973-09-01), Daab
patent: 4207508 (1980-06-01), Habisohn
patent: 4225813 (1980-09-01), Sahasrabudhe
patent: 4305030 (1981-12-01), Lorenz
patent: 4340131 (1982-07-01), Eriksson
patent: 4674176 (1978-02-01), Parke et al.

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