Vacuum motor control including float switch and in-rush current

Details Vacuum motor control including float switch and in-rush current Vacuum motor control including float switch and in-rush current

1994-03-30

1995-09-12

Ro, Bentsu

Electricity: motive power systems

Motor load, armature current or force control during...

318482, 15319, H02P 116

Patent

active

054499887

ABSTRACT:
A soft start power control device for a liquid vacuum motor includes a detection component for shutting off the vacuum motor when the vacuum's recovery tank reach full capacity, and in-rush current limiting component for restraining the in-rush current to the motor when the power is switched on, whereby the motor slowly ramps up to its operating speed. The motor is switch by a triac. The device includes a component for preventing the triac from inadvertently triggering at commutation frequency. A snubber circuit is also connected in parallel with the triac to limit the dv/dt characteristic. The detection component includes a float switch to monitor the level of liquid in the recovery tank. The detection component disables the motor once the water reaches a predetermined high level, which then requires the operator to empty the recovery tank before restarting the motor.

REFERENCES:
patent: 4993104 (1991-02-01), Kasper et al.
patent: 5234319 (1993-08-01), Wilder

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