Hitachi Automotive Systems, Ltd.

Hitachi Astemo Ltd.

Hitachi, Ltd.

Kohei Myoen

Hirokazu Matsui

Atsushi Komuro

Toshiyuki Ajima

Toshisada Mitsui

Hiroyuki Yamai

Junki Isobe

Hiroyuki Yamada

Yoshitaka Iwaji

Kazuaki Tobari

Hiroaki Sato

Kenichi Yoshida

Shigeyuki Yoshihara

Kimihisa Furukawa

Satoru Shigeta

Yasuo Noto

Kazuto Oyama

Yusuke Kogure

Yoshio Akaishi

Kentaro Matsuo

Yuuichirou Takamune

Midori Takaoka

Eigo Kishimoto

Kosei Goto

Hirokazu Sambonsuge

Atsushi Okabe

Satoshi Matsui

Shinyu Ko

Kazuyoshi Aizawa

A drive apparatus of a synchronous motor includes a current detecting unit that detects a phase current flowing to the synchronous motor and a magnetic pole position estimating unit that estimates a magnetic pole position of a rotor of the synchronous motor. The magnetic pole position estimating unit includes a first peak-to-peak detector that detects a first peak-to-peak value representing a difference between a maximum value and a minimum value of the phase current, a quadrature component detector that detects a quadrature component of the phase current, and a second peak-to-peak detector that detects a second peak-to-peak value representing a difference between a maximum value and a minimum value of the quadrature component. The magnetic pole position estimating unit calculates a first magnetic pole position and estimates an initial magnetic pole position of the rotor, based on the first magnetic pole position.

Drive apparatus of synchronous motor and method for driving synchronous motor

A motor control device controls a motor, which is driven by three-phase alternating currents and to which a magnetic pole position sensor measuring a magnetic pole position of a rotor is attached, using a detection value of a rotation angle of the motor based on a measurement result of the magnetic pole position by the magnetic pole position sensor, compares a peak-current-time rotation angle representing the detection value of the rotation angle at a peak of a current value of a target phase and a reference rotation angle representing the rotation angle at a peak of a predetermined current waveform of the target phase using any one phase of the three-phase alternating currents during a three-phase short circuit of the motor as the target phase, and corrects the detection value of the rotation angle based on a result of the comparison.

Motor control device and motor control method

A power conversion device includes: an inverter that converts a DC voltage into an AC voltage and drives a synchronous motor; and a magnetic pole position correction unit that corrects an error in a magnetic pole position of a rotor from a rotation angle sensor of the synchronous motor. The magnetic pole position correction unit includes an actual current phase calculation unit that calculates a current phase from a current when three-phase lines are short-circuited during rotation of the synchronous motor and an ideal current phase calculation unit that calculates an ideal current phase based on a rotational speed of the rotor and a temperature of a stator, and corrects the magnetic pole position from a difference between outputs of the actual current phase calculation unit and the ideal current phase calculation unit.

Power conversion device

A first torque calculation unitcalculates torque TQ_DC currently generated by a motorbased on a DC current DC. A second torque calculation unitcalculates torque TQ_UVW currently generated by the motorbased on U-phase, V-phase, and W-phase currents. A torque limit calculation unitcalculates a torque limit TQ_LMTusing a torque limit characteristic map measured in advance based on a current limit DC_LMT. A torque limit correction unitcompares first torque TQ_DC with second torque TQ_UVW to calculate a torque variation degree KP. Then, the torque limit TQ_LMTis corrected using the variation degree KPto calculate a torque limit TQ_LMT. As a result, even if required torque reaches the torque limit, the DC current does not exceed the current limit, and the output of the motor can be fully utilized by approaching the current limit.

Motor control device

Provided is a motor control device capable of suppressing a sudden change in torque due to spike noise. A control device (motor control device) continues motor control using dq-axis current command values Id* and Iq* (current command values) or dq-axis detection current values real_Id and real_Iq before detecting a noise state (detection current values before a current supplied to a motor suddenly changes) instead of dq-axis detection current values real_Id and real_Iq (latest detection current values) when the current changes suddenly.

In a motor drive device, a phase compensation amount calculation unitcalculates a phase compensation amount &#x394;&#x3b8; for compensating a voltage phase &#x3b8;v* when a control mode is switched in a control selection unit. The control selection unitoutputs the three-phase voltage command Vuvw* according to any one of the plurality of control modes based on the modulation factor Kh*, the voltage phase &#x3b8;v*, and the phase compensation amount &#x394;&#x3b8;. A PWM control unitoutputs gate signals Gun, Gup, Gvn, Gvp, Gwn, and Gwv based on the three-phase voltage command Vuvw* and a rotor position &#x3b8;d. The inverterhas a plurality of switching elements, and controls the plurality of switching elements based on gate signals Gun, Gup, Gvn, Gyp, Gwn, and Gwv to drive the AC motor

Motor drive system

To appropriately limit a current output from an inverter to a motor according to a state of a cooling mechanism that cools the motor and the inverter. A motor control unit includes a current command unit configured to calculate current command values (Id*, Iq*) for determining a current to be output to a motor on the basis of an input torque command, a motor lock determination unit configured to determine whether the motor is in a locked state on the basis of a motor rotation speed Nrpm indicating a rotation state of the motor, and a torque command limitation unit configured to limit the current to be output to the motor by limiting the torque command on the basis of a cooling water temperature Tc indicating a state of the cooling mechanism in a case where the motor lock determination unit determines that the motor is in the locked state.

The occurrence of torque in the motor due to an unintentional flow of the q-axis current in the motor during discharging of the smoothing capacitor is reduced. A motor control device according to the present invention controls a system including an inverter including a smoothing capacitor connected to a power source via a relay, a motor connected to the inverter, and a current sensor configured to detect a current flowing through the motor, the motor control device including: an electric discharge control unit configured to discharge, in the motor via the inverter, an electric charge accumulated in the smoothing capacitor; and a current sensor calibration unit configured to calibrate the current sensor in a state where no current in the motor flows during a time period from when the relay is cut off to when discharge control by the electric discharge control unit is started, wherein the electric discharge control unit performs discharge by controlling the current in the motor based on a value of the current sensor calibrated by the current sensor calibration unit.

To provide a motor control device capable of properly compensating the fluctuation in inverter output voltage during a dead time. The motor control device is for an inverter including switching elements composing upper and lower arms to convert a direct-current voltage to an alternating-current voltage and apply the alternating-current voltage to a motor thereby controlling a current of the motor to be a current target value, the motor control device including a dead time compensation unit that compensates fluctuation in inverter output voltage during a dead time with each switching between the upper and lower arms by a dead time compensation voltage, wherein the dead time compensation unit acquires an input parameter that determines a polarity of motor current during the dead time in a half-cycle of a fundamental wave of the motor current, and varies the dead time compensation voltage according to magnitude of the input parameter.

Provided are an inverter device deterring PWM voltage error even if high inverter output frequencies are used for overmodulation driving and an electric vehicle equipped with the inverter device. In an angular section where the output voltage from an inverter device is linearly approximated with the zero cross point as the center thereof, a PWM generator in the inverter device changes either the time interval between the centers of PWM ON pulses or the time interval between the centers of PWM OFF pulses depending on the inverter operation state. An electric vehicle is equipped with the inverter device, which drives a motor.

Inverter device and electric vehicle

A diagnostic device capable of accurately diagnosing the soundness of a resolver circuit is provided. A shifter receives excitation signal and excitation signal; shifts the level of excitation signal, excitation signal, or both; and performs level shifting such that a period of time that starts with one of two times in which, in the vicinity of the peak value of excitation signal, excitation signal and excitation signal are at the same value and ends with the other of the two times is less than a prescribed threshold. A trigger generation circuit generates a trigger during said period of time. A control unit determines whether there is an abnormality in the resolver circuit on the basis of the trigger.

Diagnostic device

A motor control system can suppress production costs, suppress the occurrence of unexpected excessive torque, and continue system operation as much as possible even when the diagnosis results of a monitoring device are abnormal. A computation device computes a voltage command value indicating the voltage to impose on a motor. Based on the voltage command value, the computation device generates a control signal that controls a drive device. When the diagnosis results of the monitoring device are normal, the computation device computes the voltage command value so that the absolute value of the detection value of current flowing to the motor is no greater than a second threshold, and when the diagnosis results of the monitoring device are abnormal, the computation device computes the voltage command value so that this absolute value is no greater than a third threshold that is smaller than the second threshold.

Motor control system

According to the present invention, an overcurrent fault detection device includes: an inverter converting DC current to three-phase AC currents for driving a motor; a DC voltage detector; phase current detectors; a rotational position detector that detects a rotational angle of the motor; a control circuit that controls a gate drive circuit, which controls the inverter at every predetermined cycle, based upon the phase current values, a motor rotational angle detection value, and a speed command or a torque command from a higher-order control device; and a first decision-making circuit that detects an overcurrent based upon the phase current values at every predetermined cycle, wherein: the first decision-making circuit determines whether or not the phase current values exceed a predetermined amplitude threshold value by frequency detection for any of the phase current values exceeding the predetermined amplitude threshold value, and determines that an overcurrent has occurred upon detecting the frequency.

Overcurrent fault detection device for electrical drive control system

A power supply device includes: a power supply; a first contactor and a second contactor that are connected between the power supply and a load; a voltage detection circuit that detects a voltage between a load side of the first contactor and a power supply side of the second contactor; and a control unit that sets the contactors to an open/closed state. In a state in which electrical power has not been supplied to the load, a voltage which is greater than zero and less than a voltage at the power supply is applied between a positive electrode and a negative electrode on the load side; and after controlling the contactors to an open state, the control unit makes a decision as to whether or not one of the contactors is welded based upon detection results of the voltage detection circuit.

Power supply device and method for making decision as to contactor weld of power supply device

A controller for rotating electrical machines comprises a processing unit, to which a plurality of parameters are input, for generating a switching instruction to control a switching operation of a switching semiconductor device and outputting a signal corresponding to the switching instruction to a power converter. The processing unit includes at least a function to input thereto signals having been output from each of sensors such as a current sensor to detect current passed between the power converter and a winding of an armature, a temperature sensor to detect temperature of the winding of the armature, and a magnetic pole position sensor to detect magnetic pole position of a magnetic field system, and, based upon information on current, temperature, and rotation speed of the rotating electrical machines, having been obtained from those sensor signals, detects a magnetic flux that interlinks with the winding of the armature from a permanent magnet.

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Hitachinaka, Japan

Kohei Myoen