专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

41. 发明专利

JPH044787A SPEED CONTROLLER FOR MOVING BODY 失效
公开(公告)号：JPH044787A
公开(公告)日：1992-01-09
申请号：JP10246090
申请日：1990-04-18
申请人： HITACHI LTD
发明人： KATAYAMA HIROSHI , TAJIMA FUMIO , MIYAZAKI TAIZO , MORINAGA SHIGEKI , MUTO NOBUYOSHI , NARISHIMA SEIICHI , SATO YUJI , NAKAMOTO TOSHIO , TAKAHASHI TAKASHI
IPC分类号： H02P29/00 , H02P6/06 , H02P6/08 , H02P6/10 , H02P6/15 , H02P6/28 , H02P29/40 , H02P29/50
摘要： PURPOSE:To shorten processing time by providing speed error detecting means, step function generating means, fluctuation component detecting means and correction signal forming means, and outputting a current or voltage command. CONSTITUTION:A speed detection circuit 6 outputs a speed signal Nf based on a pulse obtained from a speed detector 5. The signal Nf is fetched to a microcomputer 9, which calculates a speed error signal Ne from a difference between a speed command signal Ns from a ROM in the microcomputer 9 and the signal Nf from the circuit 6 by speed comparing means 51, and forms a speed error correction signal Ic bead on the signal Ne in a section indicated by a broken line. The signal Ne is multiplied by K times by proportional control means 53, added to a speed error correction signal Ic by command signal forming means 52, and a current command Is is outputted. A driver 1 outputs a current for generating a necessary torque based on the command.

42. 发明专利

JPH0279789A PWM-SIGNAL GENERATING METHOD OF INVERTER 失效
公开(公告)号：JPH0279789A
公开(公告)日：1990-03-20
申请号：JP22998488
申请日：1988-09-16
申请人： HITACHI LTD
发明人： SAKAI KEIJIRO , MUTO NOBUYOSHI , MOTOBE MITSUSACHI
IPC分类号： H02M7/48 , H02P21/00 , H02P23/07 , H02P27/04 , H02P27/08
摘要： PURPOSE:To simplify a circuit by operating a time for controlling the gates of six power transistors in a three-phase inverter in an MPU based on a frequency command, a voltage command and functions incorporated in a ROM, and outputting the result. CONSTITUTION:Pulse generators 2ai (i=a-f) latch 3 a timer time instructed from an MPU 7 and latch 4 the sign of a voltage. The time of a free running timer 8 is compared with the time of the latch circuit 3 all the time. When both times agree, a latching signal is inputted into an FF 6, and output pulses are changed. The value of the time of the pulse change is operated in the MPU 7 based on a first frequency command W1*, a motor output voltage command V1* and functions incorporated in a ROM 10 for every output of an interruption timer 9. The pulse change times and the signs are sequentially computed, and gate signals + or -U to + or -W of six power transistors are outputted. In this way, a simple control circuit is formed at a low cost, and one chip is implemented.

43. 发明专利

JPH01119717A ABSOLUTE POSITION DETECTING METHOD USING DOUBLE-SPEED RESOLVER 失效
公开(公告)号：JPH01119717A
公开(公告)日：1989-05-11
申请号：JP27742687
申请日：1987-11-04
申请人： HITACHI LTD
发明人： SAKAI KEIJIRO , MUTO NOBUYOSHI , TOMITA HIROYUKI , CHIBA HIROSHI , UEDA AKITERU
IPC分类号： G05D3/12 , G01B7/00 , G01B7/30 , G01D5/245
摘要： PURPOSE:To detect the absolute position from the mechanical origin with high accu racy, by judging the absolute position of the position detection value of a plural (P) pole logarithmic resolver on the basis of the detection value of a single pole logarith mic resolver. CONSTITUTION:A double-speed resolver 4 is directly connected to an induction machine 1 and constituted of a single pole logarithmic resolver 2 and a P-pole resolver 3. The two-phase exciting signal of the resolver 4 is outputted as an exciting phase theta0 through an exciting circuit 7 by counting the reference clock signal fc of an one-chip microcomputer 5. On the basis of rotary position detection values theta1x, thetapx obtained by latching the phase theta0 on the basis of the zero phases of the output signals of the respective resolvers 2, 3 by latches 91x, 9px and respectively changing within a ranges of 360 deg. and (360/P) deg., the rotary position of the rotor of an electromotor is detected. At this time, on the basis of the dividing number N obtained by dividing the detection value theta1x of the resolver 2 at every arbitrary range and the detection value thetapx of the resolver 3, the absolute position of the rotor is detected. As mentioned above, a position is detected from the detection value thetapx fundamentally but an absolute value is judged from the detection value theta1x.

44. 发明专利

JPS6455096A CONTROLLING DEVICE FOR PWM INVERTER 失效
公开(公告)号：JPS6455096A
公开(公告)日：1989-03-02
申请号：JP20812187
申请日：1987-08-24
申请人： HITACHI LTD
发明人： MUTO NOBUYOSHI , SUZUKI TOSHIO , UEDA AKITERU
IPC分类号： H02P27/04 , H02P21/04 , H02P21/22 , H02P23/03 , H02P23/07 , H02P27/08
摘要： PURPOSE:To permit the generation of a high output torque efficiently, by a method wherein the frequency of an inverter is controlled by the product of a flux correction signal, through which a flux command coincides with a flux detection value, and the angular frequency of the inverter. CONSTITUTION:A slip angular frequency omegaS, operated by a slip operating means 5, is added to a rotation angular frequency command omegaR to obtain the angular frequency command omega1 of an inverter 2. On the other hand, a flux operating means 6 operates the flux phi0 of an induction motor 4 by the slip angular frequency command omegaS and the angular frequency command omega1. A flux correction means 7 outputs a flux correction signal phi in accordance with a difference between the flux phi0 and the flux command phiR. A voltage command operating means 8 products the flux correction signal phi by the inverter angular frequency omega1 and outputs an inverter voltage command V1. A PWM signal generating means 9 outputs a PWM control signal in accordance with the angular frequency command omega1 and the voltage command V1.

45. 发明专利

JPS6323752B2 失效
公开(公告)号：JPS6323752B2
公开(公告)日：1988-05-18
申请号：JP2047781
申请日：1981-02-14
申请人： HITACHI LTD
发明人： MUTO NOBUYOSHI , MATSUDA YASUO , NANTO KENJI
IPC分类号： H02M7/48 , H02M7/527

46. 发明专利

JPS6380790A OUTPUT VOLTAGE DETECTOR FOR INVERTER 失效
公开(公告)号：JPS6380790A
公开(公告)日：1988-04-11
申请号：JP22216286
申请日：1986-09-22
申请人： HITACHI LTD
发明人： SAKAI KEIJIRO , MUTO NOBUYOSHI , UEDA AKITERU
IPC分类号： H02P21/00 , H02P21/22 , H02P23/07 , H02P23/16 , H02P27/04 , H02P27/08
摘要： PURPOSE:To accurately compensate the output voltage error of an inverter due to a dead time contained in the output voltage of the inverter by providing a dead time voltage detector to correct a voltage signal between inverter lines at a moment. CONSTITUTION:A dead time voltage detector 14 inputs the outputs iU, iV and iW of current detectors 6U, 6V and 6W to detect the output voltages VUV, VVW and VWU of the inverter 1 due to a dead time. Subtractors 15a, 15b and 15c subtract the outputs VUV, VVW and WWU of a dead time voltage detector 14 from the outputs VUVD, VVWD and VWUD of an interline voltage filter 13 and outputs momentary inverter outputs VUV, VVW and VWU. Thus, the inverter output voltage error detected from the PWM line voltage signal can be accurately compensated.

47. 发明专利

JPS6377398A OVERLOAD CONTROLLER FOR INDUCTION MOTOR 失效
公开(公告)号：JPS6377398A
公开(公告)日：1988-04-07
申请号：JP21972486
申请日：1986-09-19
申请人： HITACHI LTD
发明人： IBORI SATOSHI , SHIMANABE HIDEYUKI , HATTORI MOTONOBU , SHIMOZU TADAO , MUTO NOBUYOSHI
IPC分类号： H02P27/06
摘要： PURPOSE:To inhibit the trip of an inverter, and to improve the reliability of the inverter by gradually decreasing the output frequency and output voltage of the inverter by a predetermined time constant and suppressing the currents of a motor when the motor is in the state of overload. CONSTITUTION:In a control circuit section 7, current detecting signals IU, IV and IW are emitted by a current detector 9, and control is conducted by a microcomputer 10. When load is increased and a current detecting value exceeds a previously set allowance at that time, an inverter 2 determines the state of the overload of a motor 5, and begins to gradually diminish its own output frequency and output voltage. Progressive reduction is repeated and speed is decreased toward zero so far as overload continues. When overload is released in a progressive reduction process, however, the speed of the motor 5 is accelerated up to prescribed speed according to the previously selected time of soft start.

48. 发明专利

JPS6331476A METHOD AND APPARATUS FOR CONTROLLING PWM INVERTER 失效
公开(公告)号：JPS6331476A
公开(公告)日：1988-02-10
申请号：JP17367086
申请日：1986-07-25
申请人： HITACHI LTD
发明人： MUTO NOBUYOSHI , UEDA AKITERU , SHIMONABE HIDEYUKI , IBORI SATOSHI , HATTORI MOTONOBU , NANTO KENJI , YAMAZAWA YUJI
IPC分类号： H02M7/48 , H02M7/529 , H02M7/5395 , H02P27/08
摘要： PURPOSE:To control with constant torque a PWM inverter at a speed of wide range by judging whether the amplitude ratio of a modulation wave to a carrier exceeds a specified value or not, and obtaining a PWM pulse by an asynchronous type when it is the specified value or lower and by a synchronous type when it is the specified value or higher. CONSTITUTION:A microcomputer 30 generates PWM pulses EU EW, controls a PWM inverter 70 through a gate circuit 60, and drives an induction motor 150. The inverter 70 operates at a frequency (f) set by a variable resistor 101. The signal is input to a timer 20 through a V/f converter 15. A voltage command value VR and a reference value VA are set by variable resistors 102, 103, input to a D/A converter 40, and the signal (g) of a triangular wave generator 130 is compared by comparators 501-503 with a modulation wave (e). When the output voltage is regulated under F/f constant control, an asynchronous type is used in a range that the amplitude ratio is the specified value or smaller, and a synchronous type is used in a range that the ratio is the specified value or larger. Thus, the frequency of the PWM pulse does not become so large that its loss becomes a problem in high frequency.

49. 发明专利

JPS61189460A DETECTING METHOD FOR FAULT OF SPEED DETECTOR 失效
公开(公告)号：JPS61189460A
公开(公告)日：1986-08-23
申请号：JP2829085
申请日：1985-02-18
申请人： HITACHI LTD
发明人： MUTO NOBUYOSHI , SAKAI KEIJIRO , UEDA AKITERU , NINOMIYA JUICHI
IPC分类号： G01P3/42 , G01P3/44
摘要： PURPOSE:To detect a phase lack rapidly even if a speed change range is wide by detecting respective levels of a speed signal of another phase and a inverted speed signal on the basis of the leading edge and trailing edge of the inverted speed signal. CONSTITUTION:When the phase of a speed signal (a) is lacked, a latch 110 enters the 'L' level of the signal (a) at the leading edge of a speed signal (b) and outputs an 'L' output (c). On the other hand, an inverted speed signal a' inputted at the leading edge of an inverted speed signal b' is turned to 'H' and the output (d) of a latch 111 is always fixed. Signals (f) and (g) are the same as the normal state. Consequently, the dissidence of only the levels of both the signals (c), (d) is detected by an EXOR circuit 12A. When the level of the output (e) of the circuit 12A is turned to 'H', a differential pulse (i) is generated 13 and a CPU11B is interrupted to detect the lack of the phase. On the other hand, the pulse (i) is latched 14 and the CPU11B decides the phase lack of the signal (a) and executes the fault detecting processing of a rotary encoder 53.

50. 发明专利

JPS61185089A OUTPUT VOLTAGE DETECTOR OF INVERTER 失效
公开(公告)号：JPS61185089A
公开(公告)日：1986-08-18
申请号：JP2173085
申请日：1985-02-08
申请人： HITACHI LTD
发明人： SAKAI KEIJIRO , MUTO NOBUYOSHI , NAGASE HIROSHI
IPC分类号： H02P27/06 , H02M7/48
摘要： PURPOSE:To accurately detect the amplitude of an inverter output voltage and a momentary value by detecting a line voltage absolute value from a PWM signal, and multiplying the value by a detected DC voltage value, thereby detecting the amplitude of the output voltage of an inverter. CONSTITUTION:Exclusive OR circuits 13a, 13b, 13c input PWM signals Mu, Mv, Mw and outputs absolute value signals Suv, Svw, Swu of an inverter line voltage. A filter outputs a combined value Tout of 3-phase lie voltage by an adder 18. After the output Tout of the adder 18 and a detected DC voltage value VDC are multiplied by a multiplier 22a, the output Vout is detected as the amplitude of the output voltage of the inverter. Positive and negative line voltage momentary values AP, AN are combined in the waveform by an adder 25, multiplied by a multiplier 22b by the value VDC to detect the momentary value Vuw of the inverter output voltage.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式