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Patent Searching and Data


Title:
MOTOR DRIVER CIRCUIT AND VACUUM PUMP EQUIPPED WITH MOTOR DRIVER CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2010/016176
Kind Code:
A1
Abstract:
Provided are a compact and low-cost motor driver circuit capable of keeping the heat generated by a regenerative resistor within a specification temperature range and obtaining the proper brake time without adopting a large-capacity regenerative resistor and a heat sink and without using a larger air volume fan, and a vacuum pump equipped with the motor driver circuit. In the initial stage of regeneration, the regenerative current is controlled in such a manner that the speed characteristic gradually approaches an inclination (a) from an inclination (b) according to the motor speed.  When the regenerative current reaches a maximum brake current value I set_brake_max, a limit is imposed so that no more current flows.   During a brake operation, control is performed such that the initial brake current value at the maximum rated rotational speed is set low and the brake current is increased with a decrease in rotational speed.

Inventors:
NOMURA SHINICHI (JP)
SCHRODER ULRICH (FR)
Application Number:
PCT/JP2009/002442
Publication Date:
February 11, 2010
Filing Date:
June 01, 2009
Export Citation:
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Assignee:
EDWARDS JAPAN LTD (JP)
MECANIQUE MAGNETIQUE SA (FR)
NOMURA SHINICHI (JP)
SCHRODER ULRICH (FR)
International Classes:
H02P3/18; H02P27/06
Foreign References:
JPH06225458A1994-08-12
JPS61240869A1986-10-27
JPH1118464A1999-01-22
JPH09182474A1997-07-11
JP2005094852A2005-04-07
JP2006194094A2006-07-27
Other References:
See also references of EP 2315349A4
Attorney, Agent or Firm:
SHIINA, Masatoshi (JP)
Masatoshi Shiina (JP)
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