AC elevator control apparatus

Details AC elevator control apparatus AC elevator control apparatus

1983-03-07

1984-11-13

Truhe, J.V.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

318798, 318803, 318805, 363 35, 363 37, B66B 502

Patent

active

044820313

ABSTRACT:
Disclosed is an AC elevator control apparatus, in which AC power supplied from an AC source is rectified by a converter and a smoothing capacitor into DC power, the DC power being in turn converted by an inverter into variable-frequency AC power by which an AC electric motor is driven to operate an elevator cage. The apparatus includes a rectifying circuit connected to the AC source, a resistor connected between the rectifying circuit and the smoothing capacitor, a charging time measuring circuit for measuring the time from turn-on of the AC source until the completion of charging the smoothing capacitor, and a control circuit for producing an abnormality detection signal when it is detected that the output of the charging time measuring circuit is shorter than a predetermined value, whereby the reduction in capacitance of the capacitor, and hence the expiration of the lifetime of the same, can be evaluated in advance.

REFERENCES:
patent: 3939387 (1976-02-01), Maeda
patent: 4307442 (1981-12-01), Yano et al.
patent: 4328454 (1982-05-01), Okuyama et al.
patent: 4437050 (1984-03-01), Overzet

Affiliated with

Also associated with

Rating

AC elevator control apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with AC elevator control apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and AC elevator control apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2356171