Frequency inverting apparatus

Details Frequency inverting apparatus Frequency inverting apparatus

1991-09-10

1993-08-17

Ro, Bentsu

Electric power conversion systems

Current conversion

With cooling means

363 37, 363 67, 363 71, 361709, H05K 720, H02M 542, H02P 774

Patent

active

052374947

ABSTRACT:
An apparatus for driving a plurality of motors at different variable speeds. The apparatus includes a rectifier for supplying direct current power to a dc bus circuit. A plurality of inverters are connected to the dc bus circuit and each inverter drives a respective motor. Each inverter is controlled by an individual controller connected thereto for controlling the frequency of the output of the inverter to thereby control the speed of the associated motor. The inverters are preferably mounted on a common heat sink to reduce electrical and mechanical complexity. The apparatus permits the rectifier and the dc bus circuit to be sized to handle a maximum rating of less than the sum total of maximum loads of each of the motors. The dc bus circuit also serves to distribute energy generated by a slowing motor, for example, to other motors driven from the bus circuit. A chopper resistor may be included and switched across the dc bus circuit to provide braking to the motors.

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"Beltro-Vert" brochure, Barmag Electronic, 4 pages.

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