Motor controller power switch arrangement

a technology for motor controllers and power switches, applied in the direction of motor/generator/converter stoppers, electronic commutators, dynamo-electric converter control, etc., can solve the problems of increased electrical inductance, increased physical space and electrical conductors, and other switching problems
US20010030519A1Inactive Publication Date: 2001-10-18BAUM MATTHEW C
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
BAUM MATTHEW C
Publication Date
2001-10-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

A polyphase inverter employs multiple power semiconductor switches both for its operation and to distribute the current and heat loads for improved operation and cooling. The inherently high currents required for motor operation are divided among a plurality of smaller conductors and semiconductor switches, making a printed wiring board feasible both for power distribution and for control. The approach also permits shorter path lengths to the switches, reduced inductance, faster possible operation of the power switches, and reduced transient activity outside of the immediate switch area. Signals derived from various power points can enable the controller to assess actual current and power distribution and to apportion losses appropriately, or to limit total power output should the losses be deemed excessive.
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Description

[0001] This application is a continuation in part of application Ser. No. 09 / 392,402 filed on Sep. 9, 1999.

[0002] The present invention relates to apparatus used to drive a multi-phase motor from a direct current source. In particular it considers not the detailed circuitry, but rather the method and arrangement of the power components and electrical switches used.

[0003] In the design of inverters for operating multi-phase motors from a DC power source, various types of solid-state or semiconductor switches are employed. Although modern semiconductor switches, such as MOS-FETs have very low losses, the problems caused by the heat losses of the switching devices cannot be avoided when motors of even modest power are controlled.

[0004] Traditionally this problem has been solved by employing large heat sinks. These require space that is not always available. Alternatively, liquid cooling has been successful in some cases, but the physical problems of large power conductors used to conne...

Claims

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