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Title:
ポンプ駆動用モータの制御装置
Document Type and Number:
Japanese Patent JP4457618
Kind Code:
B2
Abstract:
A pump drive motor control apparatus controls a motor used for driving a hydraulic pump. Every time the supply of electricity to the motor is resumed (every time the motor control signal changes from a low level to a high level), the apparatus measures a time which the voltage generated by the motor requires to decrease by a predetermined amount, the time indicating the decreasing speed of the generated voltage. The apparatus normally sets the high-level maintenance time, in which the motor control signal is maintained high, to a base time. When a state in which the measured time is not longer than a reference time is detected a predetermined number of times (3 times) or more, the apparatus determines that the load of the pump is heavy. In such a case, the apparatus increases the average rotational speed of the motor by increasing the high-level maintenance time.

Inventors:
小久保 浩一
Application Number:
JP2003333249A
Publication Date:
April 28, 2010
Filing Date:
September 25, 2003
Export Citation:
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Assignee:
株式会社アドヴィックス
International Classes:
B60T8/48; B60T17/02; F04B49/06; H02P7/29; H02P7/291
Domestic Patent References:
JP2001225734A
JP2000313325A
JP2002240655A
JP2001010471A
JP3096469A
JP8501614A
JP7322480A
JP8506294A
Attorney, Agent or Firm:
大庭 咲夫
加藤 慎治
樋口 俊一