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51. 发明专利

JPS6348176A REVERSE-CONNECTION PROTECTIVE ALARM DEVICE FOR DC POWER-CONSUMING APPARATUS 失效
公开(公告)号：JPS6348176A
公开(公告)日：1988-02-29
申请号：JP18845686
申请日：1986-08-13
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： IKENO SHOJI , IGARASHI SADAYUKI , MIURA SATOSHI , CHIBA HIROSHI , SUGAI HIROSHI
IPC分类号： H02M1/00 , H02P3/18
摘要： PURPOSE:To protect a regenerative braking device or the like from being reverse-connected, by providing the input circuit of DC voltage with a reverse- blocking diode for blocking direct current in the direction opposite to that on working, and an indication circuit. CONSTITUTION:By connecting the terminal P of the DC voltage source of a regenerative braking device 2 to one end of a discharge resistance 7 and by connecting the other end of the discharge resistance 7 to the collector of a power transistor 8 via a reverse-connection preventive circuit 15 and by connecting the emitter of the transistor 8 to a terminal N, a regenerative braking circuit is composed. The reverse-connection preventive circuit 15 consists of a reverse-blocking diode 11 for blocking direct current in the direction opposite to that on working, a light-emitting device 13 connected to the reverse- blocking diode 11 in parallel with each other, and a protective resistance 12.

52. 发明专利

JPS6016146A DEVICE HAVING ROTARY MACHINE 失效
公开(公告)号：JPS6016146A
公开(公告)日：1985-01-26
申请号：JP12320883
申请日：1983-07-08
申请人： HITACHI LTD
发明人： KOBAYASHI HIDEAKI , HASEGAWA KENGO , YASUHARA TAKASHI , MIURA SATOSHI
IPC分类号： H02K5/24 , H02K9/02 , H02K9/06 , H02K9/26
摘要： PURPOSE:To lower a noise of a rotary machine by surrounding in double the machine for generating the noise by a housing and a partition wall. CONSTITUTION:A rotary machine 2 having a cooling fan 11 and a controller 3 of the machine 2 are contained in a housing 1. The machine 2 is further surrounded by a partition wall for holding an interval from the wall of the housing 1. Cooling air sucked from a suction port (a) is fed from a vent passage (k) into a vent passage (l), and fed from the suction port (f) of a rotary machine room into the rotary machine room. After the cooling air further cools the machine from outside, the air is fed from the air inlet (d) of the machine 2 into the machine, advanced as designated by a broken line with arrow (i) to cool the machine, and fed from an exhaust port (e) of the machine into a passage (g), through a passage (h), from an exhaust port (b) out of the housing (1). Further, a porous silencer mounted with an absorber is mounted at the side faced with the passage, thereby further reducing the noise.

53. 发明专利

JPS57211986A BRAKING CIRCUIT FOR THREE-PHASE INDUCTION MOTOR 失效
公开(公告)号：JPS57211986A
公开(公告)日：1982-12-25
申请号：JP9655581
申请日：1981-06-24
申请人： HITACHI LTD
发明人： MIURA SATOSHI , KOBAYASHI SUMIO , YAMAMOTO TOSHIHIKO
IPC分类号： H02P3/24
摘要： PURPOSE:To obtain a preferable braking torque in a braking circuit of a 3-phase star-connected induction motor even in the vicinity of a slip at the braking time by connecting a flywheel thyristor across a phase coil, through which a DC current flows at the time of DC braking. CONSTITUTION:Thyristors (THY) 1-6 are connected to 3-phase stator coils of a motor IM, and a flywheel thyristor (THY) 0 is connected in parallel with a stator coil U' between a terminal O led from the neutral point P of the stator coils of the motor IM and a U-phase terminal, through which a DC current flows at the braking time. The conducting angles of the THY 2 and THY 4 are controlled in synchronism with the voltage between the power sources R, S at the braking time, and the U-phase and V-phase stator coils of the motor IM are DC braked. When the THY 0 is simultaneously fired, the pulsation of the braking current flowing through the motor IM becomes small, and preferable braking torque can be obtained even in the vicinity of its slip. In this manner, the braking current is flowed through the stator coil at the braking time, thereby preventing the power source shortcircuit even at the damage or firing timing displacement of the THY 0.

54. 发明专利

JPS5797355A DC ROTARY ELECTRIC MACHINE 失效
公开(公告)号：JPS5797355A
公开(公告)日：1982-06-17
申请号：JP17323380
申请日：1980-12-10
申请人： HITACHI LTD
发明人： MURAMATSU MASAHARU , YAMAGUCHI SUSUMU , TANABE SHIYOUJI , MIURA SATOSHI , YAMASHITA SEIJI
IPC分类号： H02K23/02
摘要： PURPOSE:To prevent the insulation breakdown of a field coil in a DC electric machine by connecting coils forming the poles of the field coils in series-parallel form. CONSTITUTION:Coils 3a, 3c and 3b, 3d are respectively so connected to a power source that the surface faced with the armature 4 of field cores 2a, 2c becomes N-pole and the surface faced with the armature 4 of field cores 2b, 2d becomes S-pole. The coils 3a-3d are divided into groups G1 and G2 respectively having the coils 3a, 3c and 3b, 3d in such a manner that the coils 3a, 3c and 3b, 3d belonging to the groups G1, G2 are connected in parallel with each other. The groups G1, G2 are connected in series with each other. In this manner, the potential presented across the field coils can be lowered, thereby decreasing the factor of insulation breakdown due to insufficient withstand voltage.

55. 发明专利

JPS6373896A NOISE WARNING DEVICE OF MOTOR CONTROLLER 失效
公开(公告)号：JPS6373896A
公开(公告)日：1988-04-04
申请号：JP21394486
申请日：1986-09-12
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： IGARASHI SADAYUKI , MIURA SATOSHI , SUGAI HIROSHI , KOBAYASHI SUMIO
IPC分类号： H02P29/00 , H02P7/00
摘要： PURPOSE:To provide a simple device for warning that noise is superposed to a command signal by employing a method of indicating and warning that the noise level on a speed signal exceeds a prescribed value. CONSTITUTION:A speed control member 6 performs speed control of a motor 7 corresponding to the deviation between speed command and speed detection values. If the speed command signal with noise superposed thereto is inputted in a high pass filter 2, DC and low-frequency components are filtered and only high frequency components are outputted. This output is converted to an absolute value and smoothed by an absolute value smoothing circuit 3 in the next stage. Further a discrimination circuit 4 discriminates whether the smoothed output exceeds a prescribed value or not, and if it exceeds the prescribed value an indication lamp 5 is lit. In this constitution, it is easily seen that noise exceeding the prescribed value is superposed to the speed command signal.

56. 发明专利

JPS6231380A STARTING METHOD FOR AC MOTOR 失效
公开(公告)号：JPS6231380A
公开(公告)日：1987-02-10
申请号：JP16676385
申请日：1985-07-30
申请人： HITACHI LTD
发明人： MIURA SATOSHI , FUJIOKA SHINJI
IPC分类号： H02P1/28
摘要： PURPOSE:To suppress as excess rush current by holding the neutral point of an autotransformer connected during the prescribed period around the connection of an impedance element. CONSTITUTION:In case of starting a motor 5, a switches 1, 2 are closed to applying stepdown tap voltage of an autotransformer 4 to the motor 5. When the motor 5 is accelerated to the vicinity of a no-load rotating speed, a switch 7 is closed to connect an impedance element 6 between a power source terminal and a stepdown tap (t). Then, a switch 3 is closed to apply the full voltage to the motor 5, the switches 1, 2, 7 are opened to disconnect the autotransformer 4 and the element 6 from a current path. Thus, an excess rush current at motor starting time can be suppressed to the sufficiently small value.

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