Washing machine motor speed control circuit

Details Washing machine motor speed control circuit Washing machine motor speed control circuit

1983-07-21

1985-06-18

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

318345H, 361 33, 361 91, H02H 326

Patent

active

045244030

ABSTRACT:
In washing machine control circuits of the type in which a semiconductor controlled rectifier SCR is arranged in series with the motor M in order to control the speed of the motor, a short circuit fault of the SCR can result in damage to the machine.
A bistable device BD is reset at each zero crossing of the applied mains voltage and is set in each half cycle only if the voltage across the SCR reaches a level which cannot be reached if the SCR is short-circuited. A logic circuit LOG detects any non-setting of the bistable device for three or more consecutive half cycles of the same or alternating polarity and responds thereto by disconnecting the supply to the motor (contact R1).

REFERENCES:
patent: 4065802 (1977-12-01), Mizukawa et al.
patent: 4263646 (1981-04-01), Beatty
patent: 4355342 (1982-10-01), Franzolini

Affiliated with

Also associated with

Rating

Washing machine motor speed control circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Washing machine motor speed control circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Washing machine motor speed control circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-983116