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1. 发明专利

JPH07119595A CONTROLLER FOR START OF MOTOR 失效
公开(公告)号：JPH07119595A
公开(公告)日：1995-05-09
申请号：JP26688393
申请日：1993-10-26
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： NEMOTO YASUHIRO , SAKAMOTO TATSUO , KITAMI HIDEYOSHI
IPC分类号： F02N11/08
摘要： PURPOSE:To accurately and surely control the start of motor without restriction from the temperature increase allowable value of the motor by computing the present temp. of motor and predictingly computing whether the temp. exceeds the allowable temp. at the time of next start or not. CONSTITUTION:The current of motor detected by a current transformer 15 for a mesuring device is input to a start current/start time detector 3 and a temp. increase computing device 4. Outputs of the opening contact of a start switch 14 and constant settor 5 are input to a temp. decrease computing device 6. Namely, the temp. of motor is computed through the time of operation and the time of stop and the current of the motor. The allowable temp. specified for every kind of motors and the temp. rise when start is made again are compared with the results of prediction cumputation. Judgement is made whether the temperature of motor is lower than the level to enable the start-up to carry out the start control of the motor. It is thus possible to prevent operation error which leads to temp. increase over the allowable level by repetition of the start/stop and the like.

2. 发明专利

JP2005323426A Control method and controller of nonutility auxiliary generator 有权
标题翻译：非线性辅助发电机的控制方法与控制器
公开(公告)号：JP2005323426A
公开(公告)日：2005-11-17
申请号：JP2004137983
申请日：2004-05-07
申请人： Hitachi Eng Co Ltd , Hitachi Ltd , 日立エンジニアリング株式会社 , 株式会社日立製作所
发明人： KITAMI HIDEYOSHI , TAYA HIDEO , IWASAKI TOSHIO , AMANO YOSHIHIRO
IPC分类号： H02J3/38 , H02P9/00
摘要： PROBLEM TO BE SOLVED: To provide a means for preventing the short-time overdemand of purchased power when a non-utility main generator stops due to a failure. SOLUTION: The nonutility auxiliary generator regulates power generation by controlling an output from a nonutility auxiliary generator depending on the difference between power being supplied to an electric load and an external supply power and power generated from a non-utility auxiliary generator when the non-utility auxiliary generator issues an alarm signal of a light failure. COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：提供一种在非公用设备主发电机故障停止时防止购买电力的短时间过度的装置。解决方案：无功辅助发电机通过控制来自不利辅助发电机的输出来调节发电量，这取决于提供给电负载的电力与外部电源之间的差异以及从非公用事业辅助发电机产生的电力非实用辅助发电机发出故障报警信号。版权所有（C）2006，JPO＆NCIPI

3. 发明专利

JP2002186180A METHOD AND APPARATUS FOR VOLTAGE COMPENSATION IN DIRECT-CURRENT POWER SUPPLY 失效
公开(公告)号：JP2002186180A
公开(公告)日：2002-06-28
申请号：JP2000380014
申请日：2000-12-14
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KITAMI HIDEYOSHI , SATO OSAMU , OBARA TOSHIYUKI , KUSAYAMA YOSHIO
IPC分类号： H02J1/00
摘要： PROBLEM TO BE SOLVED: To solve the problem that, if a direct-current motor for auxiliary equipment in a direct-current power supply unit is started at a plant failure, a terminal voltage of a control device is reduced beyond an allowable range by a starting current at that time. SOLUTION: Direct-current power is supplied from an alternating-current power supply 1 to the control device 6 via a charger 3 and a storage battery 4. A bypass contactor 5b opens when the control device terminal voltage is above an allowable upper limit voltage, and closes when the control device terminal voltage is below the allowable lower limit voltage, and inserts or bypasses a silicon dropper 5a to regulate the voltage. When a motor operation command is given to a motor control circuit 7a at the plant failure, a contactor 6a, together with a synchronous contactor 5g, is closed. As a result, the bypass contactor 5b is closed by MC 5f and the silicon dropper 5a is bypassed. Thus a transient and excessive voltage drop due to the starting current is avoided.

4. 发明专利

JPS63107495A OPERATION CONTROLLER FOR MOTOR 失效
公开(公告)号：JPS63107495A
公开(公告)日：1988-05-12
申请号：JP24971386
申请日：1986-10-22
申请人： HITACHI LTD , HITACHI ENG CO LTD
发明人： KITAMI HIDEYOSHI
IPC分类号： H02P5/00
摘要： PURPOSE:To average the life and the wasting time of articles of consumption by equalizing the accumulated operation time of a motor. CONSTITUTION:Two of three motors 1 are necessary in operation for the same utility. The other one is used as a spare. The operation and the stop are executed by turning ON, OFF a breaker 2. The average accumulated operation time of the motors 1 and the accumulated operation time of each motor 1 are calculated by a comparison calculator 3. The accumulated operation time of each motor 1 is calculated by a calculator 5 under the condition that the closing contacts 4 of the breakers 2 are closed, and the average operation time is calculated by a calculator 6. Then, a deviation between the accumulated operation time of the motor 1 and the average operation time is calculated by a calculator 7. Two motors which have larger deviations at negative side are selected and signals are generated.

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