Kabushiki Kaisha Yaskawa Denki

Mitsujiro Sawamura

Hideaki Iura

Kozo Ide

Toshihiro Sawa

Jun Oyama

Yasuhiko Kaku

Junichi Watanabe

Wennong Zhang

Yoichi Yamamoto

Yasuyuki Takei

Kazuhiko Hiramatsu

Kazuo Sato

Satoshi Sueshima

Kunimasa Ando

Michihiko Zenke

Katsushi Terazono

Mengesha Mamo Wogari

Hajime Takahashi

Daichi Horimai

Kazuhiro Nonaka

Yuichi Terazono

Tuneo Kume

Masanobu Miyazato

Tatsuaki Wada

A motor control apparatus includes an AC-DC converter, an auxiliary power source, and an inverter. The AC-DC converter converts AC power into DC power and feeds the DC power to a DC bus bar. DC power is fed from the auxiliary power source to the DC bus bar and from the DC bus bar to the auxiliary power source. The inverter converts the DC power of the DC bus bar into the AC power and feeds the AC power to a motor. The auxiliary power source includes a capacitor, a DC-DC converter, and circuitry. The DC-DC converter performs conversion between a first DC voltage of the DC bus bar and a second DC voltage applied between both terminals of the capacitor or inside of the capacitor. The circuitry is configured to control the DC-DC converter to maintain positive correlation between the second DC voltage and the first DC voltage.

Motor control apparatus, power conversion device, auxiliary power source device, and method for controlling auxiliary power source device

A motor control system includes a DC-to-DC converter including a semiconductor switch and a reactor that cooperates with the switch to convert input-side DC bus voltage across first and second input-side DC buses into predetermined output-side DC bus voltage across first and second output-side DC buses and to output the output-side voltage, control circuitry that controls duty factor of the switch and determine, based on input-side detection value of the input-side voltage and output-side detection value of the output-side voltage, whether there is failure in the system when the factor is 100 percent and reactor-current detection value of reactor current through the reactor is approximately zero, a smoothing capacitor connected to the output-side buses and disposed between the output-side buses, and an inverter that is connected to the capacitor through the output-side buses, converts DC power from the output-side buses into AC power and supplies the power to a motor.

Motor control system, initial charger, and method for detecting failure

This disclosure discloses a brake diagnosis device configured to diagnose a brake of a motor with a brake. The brake diagnosis device includes a brake control part, a diagnosis part, and a signal output part. The brake control part is configured to actuate or release the brake. The diagnosis part is configured to diagnose a presence or absence of an abnormality of the brake while the brake is actuated by the brake control part. The signal output part is configured to output a signal related to a brake abnormality after the brake is released by the brake control part in a case that the diagnosis part diagnoses the brake as having an abnormality.

Brake diagnosis device and brake diagnosis method

A motor driving apparatus includes a motor driving unit, a low-voltage source, a current detecting element, and an insulation resistance degradation determinator. The motor driving unit includes an inverter coupled between a positive DC bus line and a negative DC bus line of a DC power source. The inverter converts DC power into AC power to drive an AC motor. The low-voltage source is coupled between a ground and at least one of the positive DC bus line and the negative DC bus line. The current detecting element detects a closed circuit current flowing through a closed circuit of the low-voltage source, the AC motor, and a part of the inverter. The insulation resistance degradation determinator makes a comparison between the closed circuit current and a predetermined threshold, and configured to determine, based on the comparison, whether an insulation resistance of the AC motor is degraded.

Motor driving apparatus

There is provided a PWM inverter capable of preventing a phase error from occurring in generating a PWM signal even in the case where a carrier wave frequency is not sufficiently higher than a signal wave frequency. A PWM signal generating section () includes a phase adjusting section () configured to advance a phase of the signal wave by adding, to a signal wave, a delay component of the PWM signal with respect to the signal wave, the phase delay component being involved by digital control. Furthermore, in a case where the carrier wave frequency is changed, the phase delay component with respect to the signal wave is updated in synchronism with the timing of change of the carrier wave frequency.

PWM inverter

A servo control apparatus capable of suppressing adverse effects of disturbance, load variation and the like, and realizing robust and high-performance speed control. The apparatus includes both of the following observers: a disturbance observer for adding a disturbance compensation torque T, calculated from a torque command T* and an electric motor rotational speed &#x3c9;, to a torque command basic signal T*, calculated on the basis of a deviation between a speed command &#x3c9;* and a feedback speed &#x3c9;by a PI control section, thus outputting the torque command T*; and a phase advance compensation observer for generating, from the torque command basic signal T* and the electric motor rotational speed &#x3c9;, an output of a nominal plant serving as an element in which no delay occurs, thus outputting the output as the feedback speed &#x3c9;.

Servo control apparatus

A voltage type inverter apparatus comprising a voltage correcting portion. The voltage correcting portion corrects a given voltage instruction based on a value generated by passing a direct current bus voltage detected value through a first degree delay filter. In decelerating a speed of the alternating current motor, the speed is decelerated in an overexcited state by multiplying the given voltage instruction by a set gain. Simultaneously, a time constant of the first degree delay filter is made larger than a time constant in a normal control state.

Method of decelerating alternating current motor and inverter apparatus

It is the objective of the present invention to provide a sensorless vector control method and a control apparatus, for an alternating-current motor, that can smoothly restart an alternating-current motor in the free running state. According to the present invention, when a current that flows in an alternating-current motor () at a restart timethe alternating-current motor () continuously flows at a designated current level or higher for a designated period of time, it is determined that the rotational direction or the velocity of the alternating-current motor () is incorrectly estimated, and a direct current or a direct-current voltage is again applied to again estimate the rotational direction and the velocity.

Sensorless vector control method for alternating-current motor and control apparatus therefor

A control device is provided for a synchronous motor, which drives the synchronous motor through a voltage operated PWM inverter and controls a torque and a speed of the motor, including a unit for causing a PWM carrier signal to have an arbitrary phase difference between two phases such UV, VW, or WU in three phases of U, V, and W, a unit for extracting a high frequency voltage and a high frequency current, which are thus generated from a detecting voltage or a command voltage and a detecting current, and a unit for estimating a position of a magnetic flux or position of a magnetic pole by using the high frequency voltage and the high frequency current which are excited.

Control device for synchronous motor

It is an object of the invention to provide an apparatus for estimating a magnetic pole position of a motor in which the amplitudes of high-frequency currents can be adjusted. In the invention, a controlling apparatus for driving a motor (-) by a voltage source PWM inverter (-), and controlling a torque and speed, or torque, speed, and position of the motor has: means for switching over first means for producing an arbitrary phase difference in PWM carrier signals between respective two phases such as UV, VW, or WU of three or UVW phases, and second means for causing the phase difference between two phases such as V, VW, or WU of three or UVW phases to become zero; means for extracting high-frequency currents in a same frequency band as carrier signals generated by it, from estimated currents; and means (-) for estimating a magnetic pole position by using the extracted high-frequency currents.

Motor magnetic pole position estimation device and control device

An inverter driving method for has an arrangement polyphase induction motor, for altering a plurality of winding connections of the motor and a storage arrangement for a plurality of motor control constant groups preset corresponding to the respective winding connections so as to perform optimal vector control. When the classification of the winding connection is selected, one set of motor control constant groups corresponding to the winding connection is read out of the storage arrangement and applied to a control unit of the induction motor as control constants.

Growing community of inventors

Kitakyushu, Japan

Mitsujiro Sawamura