Arrangement for rotor-frequency-dependent short- circuiting...

Details Arrangement for rotor-frequency-dependent short- circuiting... Arrangement for rotor-frequency-dependent short- circuiting...

H - Electricity

02

P

318/120

H02P 7/00 (2006.01) B66B 1/30 (2006.01) H02P 1/34 (2006.01)

Patent

CA 1197283

A B S T R A C T The invention relates to an arrangement for rotor- frequency-dependent short-circuiting of rotor-resistances for driv- ing motors, more particularly in the case of hoist motors. To this end use is made of a frequency-detecting/and converter unit and a rated-value pre-selector which are connected to a comparison- circuit which produces a short-circuiting command. The frequency- detecting and converter unit consists of a rotor-frequency-depend- ent gate-circuit which, in the open condition, releases a fixed reference frequency to a counter which, in turn, passes the counted periods of the reference-frequency, through a matrix- circuit such as an EPROM, as a digital rated rotor-frequency value, to a comparison-circuit, rated-value pre-selection being effected digitally by adjustable code-switches at the comparison-circuit.

418078

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