A motor control device has: a motor current detecting portion for detecting, based on a current flowing between an inverter that drives a three-phase motor and a direct-current power supply, a motor current flowing through the motor; a specified voltage value producing portion for producing, based on the motor current, a specified voltage value as a target value for a voltage to be applied to the motor, and outputting the specified voltage value thus produced; a specified voltage value holding portion for holding an earlier specified voltage value outputted from the specified voltage value producing portion; and a specific period setting portion for setting a specific period based on a voltage difference between two of U-phase, V-phase, and W-phase voltages of the motor. Outside the specific period, the motor is controlled via the inverter based on the specified voltage value outputted from the specified voltage value producing portion, and, within the specific period, the motor is controlled via the inverter based on the specified voltage value held by the specified voltage value holding portion.

Motor control device

A motor-driven compressor includes a compression unit, an electric motor, a housing, a cover, wherein the cover includes a main body and a connector coupler, and the cover and the housing define an accommodating chamber, a motor driving circuit that is accommodated in the accommodating chamber and includes a circuit board, and a metal terminal held in the connector coupler, wherein the metal terminal includes first and second end portions. The cover has a shield including a first shield portion, which blocks electromagnetic noise and forms at least part of the connector coupler, and a second shield portion, which blocks electromagnetic noise and forms at least part of the main body. The first and second shield portions are coupled to each other. The second shield portion includes an insertion hole into which one of the first and second end portions of the metal terminal is insertable.

Motor-driven compressor

A start-stop or idle-stop method for a heavy-duty hybrid vehicle that turns off the fuel supply while maintaining the crankshaft rotation of the internal combustion engine when the vehicle stops or, optionally, when the vehicle travels downhill, travels in a noise sensitive location, travels in an exhaust emissions sensitive location, or operates in an emergency situation. The stop-start or idle-stop method automatically turns on the engine fuel supply to restart combustion when the vehicle starts accelerating, is no longer traveling downhill, is no longer traveling in a noise sensitive or exhaust sensitive location, is no longer in an emergency situation, or has dropped below the minimum energy storage restart level.

Method of controlling engine stop-start operation for heavy-duty hybrid-electric and hybrid-hydraulic vehicles

A motor controller comprises a processor selectively outputting an on-signal to either one of an upper arm switching element and a lower arm switching element based upon a detected position by the position sensor, gate drivers inputting a driving voltage to the gates of the switching elements by shifting a level of the on-signal from the processor to the upper arm switching element and a bootstrap capacitor configured to be charged while the upper arm switching element is turned off and to behave as a voltage supply for the gate driver while the upper arm switching element is turned on. The processor is configured to reduce a set duty ratio when the set duty ratio is equal to or larger than a predetermined value (e.g. 80 percents) and a rotational position of the motor does not change for a first predetermined time. This motor controller can prevent the switching element from a burnout even if the motor is locked.

Motor controller and electric tool using the same

A control apparatus for a vehicular drive system including an electric differential portion and a mechanical power transmitting portion which are disposed in series in a power transmitting path between an engine and a drive wheel of a vehicle, the control apparatus being configured to limit an output of the engine according to a difference between an actual rotating speed of an input rotary member of the mechanical power transmitting portion, and a theoretical rotating speed calculated from an actual vehicle speed and a presently established speed ratio of the mechanical power transmitting portion, whereby reduction of torque capacity of an input clutch provided in the mechanical power transmitting portion does not cause an excessive rise of the rotating speed of a rotary member which is located on one side of the input clutch nearer to the engine, and an excessive rise of the rotating speed of an electric motor connected to the input rotary member.

Control apparatus for vehicular drive system

A gas-sparing vehicle is achieved by a control system for a hybrid vehicle equipped at least with: a hybrid engine which includes at least a first rotary electric unit for deciding the rpm of the engine and a second rotary electric unit for deciding the driving force of the vehicle and which has power converting means connected to the output shaft of the engine; and electricity storing means. In one embodiment, a hybrid controller 16 controls the drive of a first rotary electric unit 2000 according to a startup torque command value which is decided based on the rpm of an engine at the time of engine startup and which decreases as the rpm increases; it also determines that the complete explosion in an engine 1 has occurred when the startup torque command value falls below a predetermined complete explosion judgment value.

Controller for hybrid vehicle

A control system controls, based on a comparison between a waved real current to be supplied to a multiphase rotary electric machine and a hysteresis region established by a waved command signal, a switching timing of a switching element of an inverter to which a direct current voltage is applied to thereby match the waved real current with a waved request current. A determining unit determines whether a workload associated with rotation of the portion of the multiphase rotary electric machine is equal to or greater than a corresponding predetermined value. When it is determined that the workload is equal to or greater than the predetermined value, a changing unit changes the waved command signal from being set to the waved request current so as to determine the switching timing of the switching element based on a positional relation between the waved request current and the changed waved command signal.

Control system for multiphase rotary electric machines

A rotating machinery includes a first control member for performing rectangular wave control by operating the switching devices of an inverter such that an on-state and an off-state occur once for one cycle period in electrical angle of a motor, a second control member for operating the switching devices on the basis of a magnitude relation between upper and lower limits of a predetermined hysteresis region and an actual current flowing through the motor, and a switching member for, when the actual current deviates from the hysteresis region while the rectangular wave control is undertaken, switching the control to an instantaneous current value control performed by the second control member.

Rotating machinery controller

The invention provides techniques for reducing or altering the magnetic noise of an AC rotary electric machine. A magnetic noise reducing harmonic current of order n, whose frequency is n times the frequency of the fundamental frequency component of a polyphase AC current fed to an armature of a polyphase AC rotary electric machine, is superimposed on the polyphase AC current, thereby reducing or altering a harmonic component having a frequency (n−1) times the frequency of the fundamental frequency component and occurring due to a radial magnetic excitation force acting radially on an iron core of the AC rotary electric machine. Magnetic noise is caused by a vibration whose energy is the sum of the circumferential and radial vibrations of the iron core occurring due to the magnetomotive force of the rotor, and altering the radial vibration is particularly effective in altering the magnetic noise; as the harmonic component of the radially acting magnetic excitation force, occurring due to harmonic components having frequencies 3, 5, 7, and 13 times the fundamental frequency, has a frequency 6 or 12 times the fundamental frequency, the magnetomotive force of the rotor can be effectively reduced or altered when a current having a frequency 7 or 13 times the fundamental frequency is superimposed on the stator current.

Magnetic noise reduction method for AC rotary electric machine, and motor control apparatus and AC rotary electric machine apparatus using the same

If the magnitude of a voltage command vector to a motor driver is smaller than a preset value in a control period, in each of a predetermined number of subsequent control periods (a compensation period), a pulse voltage vector is added to the voltage command vector so as to make substantially zero the average value of the added pulse voltage vectors during the compensation periods, and the compensated voltage command vector is used for the subsequent calculation. Also, two direction data for each phase winding are stored at the center of each of the two dead times following the edges of a voltage command pulse in each control period. An estimated phase voltage is calculated from the last voltage command pulse width, a phase voltage fluctuation during the two dead time of each control period and the stored direction data. The rotor position angle is precisely calculated from the estimated phase voltage.

Hiroya Tsuji

Papers

Controller for hybrid vehicle

Control system for multiphase rotary electric machines

Rotating machinery controller

Magnetic noise reduction method for AC rotary electric machine, and motor control apparatus and AC rotary electric machine apparatus using the same

Sensorless control system and method of permanent magnet synchronous motor