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1. 发明专利

JPH09238494A INVERTER EQUIPMENT FOR DRIVING MOTOR 失效
公开(公告)号：JPH09238494A
公开(公告)日：1997-09-09
申请号：JP4630296
申请日：1996-03-04
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： NAKAMURA ATSUHIKO , TOMITA HIROYUKI , SASAKI TSUYOSHI , YONEMOTO SHINJI , HIRAGA MASAHIRO
IPC分类号： H02M7/48 , H02P27/06 , H02P7/63
摘要： PROBLEM TO BE SOLVED: To sufficiently restrain the transfer to inverter trip by torque limiting function while sufficiently keeping protective function, and surely prevent meaningless system down. SOLUTION: A control circuit 8 controls a power inverter part 5 by using a DC voltage VD detected by a DC voltage detecting part 4 and an output AC current IA detected by an AC current detecting part 6. Therefore, the inverter trip function for overload protection and the torque limiting function for load protection can be obtained. The inverter output frequency (f) is controlled according to the DC side voltage VD. When it exceeds a specified voltage at the time of operation of the torque limiting function, the dropping ratio of the inverter output frequency (f) is reduced, and it is prevented that a motor 7 turns to a regenerative state when the torque limiting function operates.

2. 发明专利

JPH1197617A SEMICONDUCTOR MODULE 失效
公开(公告)号：JPH1197617A
公开(公告)日：1999-04-09
申请号：JP25468697
申请日：1997-09-19
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： NAKATSU KINYA , SUZUKI NOBUNAGA , HIRAGA MASAHIRO , BABA SHIGEYUKI , ITO KAZUHIRO , BENTANI HIROYUKI , SANO MASAHIRO , TOMITA HIROYUKI , ISHIDA SEIJI , YONEMOTO SHINJI , WATANABE HIROSHI
IPC分类号： H01L25/07 , H01L25/18 , H05K3/28 , H05K3/30
摘要： PROBLEM TO BE SOLVED: To prevent the attachment of a module-encapsulating resin to an electrolytic capacitor and prevent the electrolytic capacity from falling in by providing a spacer securing a distance between a wiring board and a lower part of the electrolytic capacitor which is not smaller than the resin, and covering the lower part of the capacitor to a sufficient height. SOLUTION: A resin board 19, on which a gel-like resin 14 filled to close an aperture of a power module, an element control semiconductor element 10 in a resin 9, a transformer for generating power therefor, and an electrolytic capacitor 11 for rectifying and smoothing the secondary side of the transformer are mounted, is electrically connected with an electrode and is electrically connected with a semiconductor element on a metal board 3. Then, a spacer 16 having a wall for covering the lateral side of the electrolytic capacitor 11 is provided between the electrolytic capacitor 11 mounted on the resin board 19 and the resin board 19, thus preventing the resin 9 from attaching to a lower part of the electrolytic capacitor 11. The shape of the spacer 16 may be a rectangular or others in shape, as long as the lower part of the electrolytic capacitor 11 can be housed within the spacer 16.

3. 发明专利

JPH1066386A RESTARTER FOR INVERTER AFTER MOMENTARY INTERRUPTION 失效
公开(公告)号：JPH1066386A
公开(公告)日：1998-03-06
申请号：JP22136796
申请日：1996-08-22
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： TOMITA HIROYUKI , NAKAMURA ATSUHIKO , YONEMOTO SHINJI , HIRAGA MASAHIRO
IPC分类号： H02H7/122 , H02M7/48 , H02P27/06 , H02P7/63
摘要： PROBLEM TO BE SOLVED: To provide a restarter for inverter after momentary interruption, in which detection of residual voltage phase in an induction motor is not required. SOLUTION: When power interruption is detected by a momentary power interruption detection circuit 9, a control circuit 24 for restart after momentary interruption switches a switching circuit 26 to feed a PWM signal Po for attenuating the residual voltage to a switching drive circuit 8. Consequently, a gate pulse GP for attenuating the residual voltage is generated and fed to an inverter 4 where all switching elements in any one of upper and lower arms are turned on simultaneously. AC output terminals of the inverter 4 are thereby short- circuited and the inverter 4 is restarted after the residual voltage in an induction motor 5 is attenuated forcibly. Since the residual voltage in the induction motor can be attenuated to zero level in a short time without waiting natural attenuation, the time to be elapsed before restart is shortened thus realizing restart after momentary interruption.

4. 发明专利

JP2011211796A Controller for synchronous motor 审中-公开
标题翻译：同步电机控制器
公开(公告)号：JP2011211796A
公开(公告)日：2011-10-20
申请号：JP2010075629
申请日：2010-03-29
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： TAKANO HIROMICHI , OHASHI TAKANORI , YONEMOTO SHINJI , YANADA TETSUO , MATSUMOTO YUTAKA
IPC分类号： H02P23/00 , H02P6/10
摘要： PROBLEM TO BE SOLVED: To suppress a speed ripple with an irregular amplitude by creating a correction for suppressing the speed ripple of a synchronous motor due to a cyclic disturbance, based on a preset parameter.SOLUTION: The switch 22 of a cyclic disturbance corrector 19 is switched off, and a constant speed command Nref is inputted to rotate the synchronous motor 4. At this time, a cyclic disturbance correction signal h(θ) is not supplied to an adder 6 from the cyclic disturbance corrector 19, and it operates in the state where a speed ripple caused by the cyclic disturbance Txst is not suppressed. In such a state, a PC23 for adjustment of a controller fetches and monitors a current command Iref, and finds a phase adjustment amount θofst, an order B, and an amplitude function f(θ) with a motor rotational position θ as a variable, and generates h(θ)=f(θ) sin(B θ+θ+ofst) as a cyclic disturbance correction signal h(θ), based on this parameter, and adds it to the adder 6.
摘要翻译：要解决的问题：基于预设参数，通过产生用于抑制由于循环扰动引起的同步电动机的速度纹波的校正来抑制具有不规则振幅的速度波动。解决方案：循环扰动校正器19的开关22 并且输入恒定速度指令Nref以使同步电动机4旋转。此时，循环扰动校正信号h（θ）不从循环扰动校正器19提供给加法器6，并且其操作在不会抑制由循环扰动Txst引起的速度波动的状态。在这种状态下，用于调节控制器的PC23提取并监视电流指令Iref，并且以电动机旋转位置θ为变量，求出相位调整量θofst，阶数B和振幅函数f（θ）并根据该参数生成h（θ）= f（θ）sin（Bθ+θ+ ofst）作为循环扰动校正信号h（θ），并将其加到加法器6。

5. 发明专利

JPH11136995A INVERTER 失效
公开(公告)号：JPH11136995A
公开(公告)日：1999-05-21
申请号：JP30076397
申请日：1997-10-31
申请人： HITACHI LTD
发明人： WATANABE HIROSHI , ISHIDA SEIJI , YONEMOTO SHINJI , TOMITA HIROYUKI
IPC分类号： B66B1/30 , H02M7/48 , H02P27/06 , H02P7/63
摘要： PROBLEM TO BE SOLVED: To provide an inverter in which shock on a motor incident to alteration of frequency is suppressed sufficiently. SOLUTION: This inverter performs variable speed control of a motor by controlling the output frequency (f) of a power converter 1 toward a target frequency F delivered from a target frequency setting section 2 according to a preset variation pattern. A comparator 3D compares the target frequency F with an output frequency command Fc and only when they match each other, a switching signal S7 is generated in order to switch the contact (a) in a switch 3B to contact (b). A memory 3C is then updated with a new output frequency command Fc. When the control being executed according to the variation pattern is in transient state, the control is prohibited to start according to a variation pattern based on a new target frequency F, and thereby shock on the motor can be eliminated.

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