Kabushiki Kaisha Toshiba

Toshiba Electronic Devices & Storage Corporation

Toshiba Carrier Corporation

Carrier Japan Corporation

Toshimitsu Aizawa

Takashi Takagi

Sari Maekawa

Kazunobu Nagai

Shen Wang

Naoki Oomura

Sadao Ikeda

Shinichi Kominato

Kohei Hasegawa

Nobuyuki Suzuki

Takeshi Shibayama

Makoto Shinohara

Tsuyoshi Hosoito

Yukihisa Hasegawa

Tsuyoshi Shinohara

Tadashi Asukai

Shigeru Nakajima

Toshikazu Sekihara

Yoshitaka Uchiyama

Junichiro Hagura

Shuting Li

Naohito Kamiya

Jun Sodesawa

Mariko Kuboi

Hiroyuki Ishida

An electric motor drive apparatus includes an electric motor. A power conversion device, a controller, and a current detector. The controller calculates a phase of an armature flux linkage of the electric motor by using a flowing current detected by the current detector. The calculating a phase of an armature flux linkage of the electric motor includes calculating an armature flux linkage of the electric motor including an initial value of an armature flux linkage of the electric motor which is calculated from a rotational position of the electric motor estimated by using a motor flux of the electric motor measured in advance and the flowing current.

Electric motor drive apparatus, electric motor drive method, and storage medium

In an embodiment, a diagnostic apparatus of an electric power converter is provided, and the electric power converter outputs a converted AC electric power to an electric motor, thereby driving the electric motor. The diagnostic apparatus includes an output control unit and a degradation determination unit. The output control unit controls operations of semiconductor elements of the electric power converter, thereby outputting electric power from the electric power converter to the electric motor by constant voltage output, which constantly sets an output voltage to the electric motor in a target voltage pattern. The degradation determination unit determines a degradation state for at least one of the semiconductor elements based on a current flowing through the electric motor in the constant voltage output.

Diagnostic apparatus, diagnostic system and diagnostic method of electric power converter and non-transitory storage medium

A motor control device of an embodiment includes a power supply unit that supplies AC power to a motor; a current detection unit that detects a current flowing through a winding of the motor; a speed and electric angle estimation unit that estimates a rotation speed and an electric angle of the motor based on a voltage outputted by the power supply unit and the current; a coordinate conversion unit that obtains an excitation current and a torque current based on the current and the electric angle; a torque current command determination unit that substitutes a predicted torque calculated based on a mechanical motion equation into a torque component current command value calculated based on a torque expression of a vector control coordinate, to generate a torque component current command value for bringing a difference between an inputted speed command and an estimated speed closer to zero; and a model prediction control unit that applies, to a plurality of predicted currents including a current change ratio determined depending on each of a plurality of switching patterns based on a space voltage vector that are able to be outputted by the power supply unit, an evaluation function to evaluate a size of a difference from a predicted current corresponding to each of the torque component current command value and an excitation component current command value inputted from outside, and that selects and outputs a switching pattern.

Motor control device and air conditioner

According to one embodiment, a driving device includes a voltage controller, a parameter setter, and a phase adjuster. The voltage controller causes an electric power converter to apply a drive voltage to the electric motor, the electric power converter converting input electric power to A/C electric power having desired voltage and frequency and supplying the converted electric power to an electric motor. The parameter setter sets at least one of a rotation speed of the electric motor and a parameter related to the rotation speed as speed information. The phase adjuster adjusts a phase of the drive voltage in such a manner that an index calculated based on a current flowing in the electric motor and the speed information set in the parameter setter becomes smaller.

Driving device, driving system, and method of driving electric motor

A driving device of one embodiment includes a phase estimator and a voltage controller. The phase estimator estimates a phase of stator interlinkage magnetic flux of an electric motor based on a current flowing through the electric motor, a voltage command of a drive voltage applied to the electric motor, and a winding resistance value of the electric motor. The voltage controller acquires a first voltage vector component in a direction in which the stator interlinkage magnetic flux acts and a second voltage vector component in a direction which is orthogonal to the direction in which the stator interlinkage magnetic flux acts for the voltage command of the drive voltage, and sets the voltage command of the drive voltage based on the first voltage vector component and the second voltage vector component.

A motor control device including a PWM generator generating a PWM generator generating a PWM signal to be outputted to a drive circuit that energizes a winding of a switched reluctance motor; a rectangular wave generator outputting a rectangular wave signal of 1 pulse or more to the drive circuit in 1 drive period of each phase based on a rotational position of the motor; and a drive signal switcher executing switching so that a PWM drive by the PWM signal is performed when a rotational speed of the motor is equal to or less than a threshold value and a rectangular wave drive by the rectangular wave signal is performed when the rotational speed of the motor is greater than the threshold value. The PWM generator synchronizes a timing to start generation of a carrier of the PWM signal with rising of the rectangular wave signal.

Motor control device

A motor control integrated circuit according to embodiments outputs predetermined PWM signals to an inverter circuit that drives a synchronous motor and is configured to perform on-off control on a plurality of three-phase bridge connected switching elements in accordance with the PWM signals to convert direct current into three-phase alternating current, and includes: a PWM generation unit configured to generate the signals based on a received speed command value and output the PWM signals; and a current detection unit configured to detect differential values of phase currents at a predetermined time point that is fixed within a period of a carrier wave used for PWM control, based on the carrier wave and a signal generated by a current detector for detecting current conducted to the synchronous motor, wherein the PWM generation unit calculates a speed of the synchronous motor based on the differential values and then, based on the speed, generates the PWM signals to be applied to the synchronous motor.

Motor control integrated circuit

A motor driving apparatus according to an embodiment includes a brushless motor. The motor driving apparatus includes a position sensor that outputs a position detection signal in synchronization with a phase of an induced voltage of a coil of the brushless motor. The motor driving apparatus includes a semiconductor integrated circuit that controls driving of the brushless motor by supplying a pseudo sine-wave driving voltage from an energization terminal to the coil of the brushless motor based on the position detection signal and a command signal that prescribes driving of the brushless motor.

Semiconductor integrated circuit and motor driving apparatus

A motor control device controlling an inverter to control an electric motor, includes a plurality of function sections, a voltage command generating section generating a d-axis voltage command and a q-axis voltage command, a voltage operational processing section, an input current operation section, a speed information generating section estimating a rotational speed of the motor based on at least one of a motor constant, a positional information generating section delivering positional information about a rotor, and a processor executing control software set by a user or a manufacturer. At least a part of the function sections are configured by hardware. The function section configured by the hardware is given at least one parameter retaining section. The parameter retaining section is configured so as to be readable/writable on the processor. The function section is configured by the hardware so as to be operated in a predetermined sequence.

Motor control device and electrical equipment provided with the same

A motor control unit includes a power converter unit that energize a motor based on a commutating signal, the motor having a rotor provided with a permanent magnet and a stator having a coil wound thereto; a start-up controller that outputs a commutating signal to the power converter unit during a start-up operation, the commutating signal having a predetermined conductive pattern corresponding to a command rotational speed; a voltage calculator that calculates a voltage of the motor during the start-up operation by applying a parameter for the motor, the command rotational speed, and a current flown in the coil of the motor to a voltage-current equation of the motor; and a determiner that, during the start-up operation, compares a voltage calculated by the voltage calculator and an actual voltage of the motor and that determines occurrence of rotational abnormalities when the actual voltage is lower than the calculated voltage.

Growing community of inventors

Yokohama, Japan

Toshimitsu Aizawa