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1. 发明专利

JPH09303284A MOTOR-DRIVEN FLUID MACHINERY AND FREQUENCY CONVERTER USED FOR THE FLUID MACHINERY 失效
公开(公告)号：JPH09303284A
公开(公告)日：1997-11-25
申请号：JP13963196
申请日：1996-05-09
申请人： EBARA CORP , EBARA DENSAN KK
发明人： KOBAYASHI MAKOTO , YAMAMOTO MASAKAZU , MIYAKE YOSHIO , YAGI KAORU , UEI KEITA , MIYAZAKI YOSHIAKI , IIJIMA KATSUJI , CHIYOUJITANI HAJIME , NIHONGI NAOTOSHI , MORIZUKI HIROSHI
IPC分类号： F04D15/00 , F04D13/08
摘要： PROBLEM TO BE SOLVED: To eliminate a useless operation by storing drive modes made to contain the speed, operation time and rest time of a motor as elements, and performing operational control via the selection of one of the drive modes on the basis of the specific gravity of fluids, regarding a machine to draw a plurality of fluids having different specific gravity. SOLUTION: At the time of starting a pump, a priming plug 26 is preliminarily removed and then a barrel 1 is replenished with self-priming for storage in annular space (delivery chamber) 8. Then, the pump is started. As a result, the priming is drawn into a pump easing 11 via a self-priming circulation water suction port 23 open to the annular space 8. Also, an air-water mixture of the air at the suction side and the priming drawn from the suction port 23 is pressurized with an impeller 12, and discharged from a delivery port 24 to the delivery chamber 8. In this case, consumption torque per revolution is detected to find the specific gravity of a fluid. Furthermore, the most effective drive mode is selected depending on a fluid to be drawn, on the basis of the specific gravity. For example, a high speed rotation mode is selected at the time of drawing the air of low specific gravity, while a low speed rotation mode is selected at the time of drawing water of high specific gravity.

2. 发明专利

JPH07236280A PWM-SIGNAL GENERATOR OF PWM INVERTER 失效
公开(公告)号：JPH07236280A
公开(公告)日：1995-09-05
申请号：JP4783794
申请日：1994-02-22
申请人： EBARA DENSAN KK
发明人： NIHONGI NAOTOSHI , CHIYOUSHIYA HAJIME , WATANABE JIRO
IPC分类号： H02M7/48 , H02P27/06 , H03K7/08 , H02P7/63
摘要： PURPOSE:To realize smooth acceleration and the rotation at a constant speed with a simple circuit by switching driving signals having two different signals at the time of acceleration and at the time of a steady state and using the signals. CONSTITUTION:The pulse of an oscillator 1 is imparted to a preset counter 4, which counts down. The value of the counter is inputted into a ROM 6. PWM signal data stored in corresponding addresses are taken out and latched with a latch circuit 7. Then, the data are inputted into a driver 8. The driver 8 performs the PWM control based on the signal. At the stage of the initial period of the acceleration of a motor 9, the signal, which changes a switch 3 to the side of a frequency divider 2, is outputted from the address of the corresponding ROM 6 into a driving-signal switching signal line 16. The pulse of a low frequency is inputted into the counter 4. When the motor 9 reaches the specified speed, the driving-signal switching signal line 16 changes the switch 3 to the side of the oscillator 1 based on the output from the address of the corresponding ROM 6, and the high frequency pulse is inputted.

3. 发明专利

JPH07235783A METHOD OF FIXING POWER MODULE 失效
公开(公告)号：JPH07235783A
公开(公告)日：1995-09-05
申请号：JP4783894
申请日：1994-02-22
申请人： EBARA DENSAN KK
发明人： MORIZUKI HIROSHI , YAMATANI KYUGO , SASAKI TAKAHIKO , NIHONGI NAOTOSHI
IPC分类号： H05K7/12 , H01L23/40 , H05K7/20
摘要： PURPOSE:To provide a method of fixing a power module which enables easy removal of the power module from a heat sink after connecting the power module to a printed wiring board by fixing it to the heat sink. CONSTITUTION:This is a method of fixing a power module 2 wherein a fixing a heat sink 1 and a power module 2 are bonded and fixed by screwing. A fixing male screw 5 is inserted to a hole provided to the heat sink 1 and a hole 8 provided to the power module 2 from the side of the heat sink 1, and is screwed to a nut 4 or a female screw at the side of the power module 2 and a printed wiring board 3 to be connected to a terminal of the power module 2 is fixed to a terminal of the power module 2 by soldering.

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