A motor control apparatus includes: multiple motor drive circuits that drive at least one motor; and multiple microcomputers that are operated by a microcomputer power source and include a drive signal generator that generates a motor drive signal. The microcomputers include at least one microcomputer including a stop determiner that determines that operation of an own microcomputer is about to be stopped and transmits information as a stop determination signal. A microcomputer having received the stop determination signal from at least one different microcomputer actually stops operation of an own microcomputer.

A motor control apparatus include: multiple motor drive circuits that drives at least one motor; multiple microcomputers that include a drive signal generator, and a drive timing generator; and multiple clock generation circuits. The microcomputers include a synchronization signal transmitter microcomputer as at least one microcomputer that transmits a synchronization signal synchronized with the drive timing of an own microcomputer and synchronizing the drive timing of the microcomputers. The microcomputers include a synchronization signal receiver microcomputer as at least one microcomputer that receives the synchronization signal transmitted from the synchronization signal transmitter microcomputer.

Switching elements are mounted on a substrate and switch energization of motor windings. A lead wire set connects phase coils of the motor windings to the substrate. The switching elements, the lead wire set, a power terminal which is a power supply terminal and a ground terminal, and a control circuit unit are provided for each system. The switching elements, the lead wire set and the power terminal are collectively arranged in a power region for each system, and the lead wire sets are arranged in rotational symmetry.

A steering wheel arrangement 1 is described comprising a steering wheel (2) having a rim (3) and a steering column 4 rotatably supported in the housing (5) and connected to the rim (3), wherein an electric machine (9, 13, 14) is operatively connected to the steering wheel (2). Such a steering wheel arrangement should be able to produce a force feedback to a traditional steering wheel in a reliable low-cost solution with a high functional safety rating. To this end electric machine (9, 13, 14) is integrated in the rim (3).

In a motor driving device, a current detector detects a value of the motor current, and a limit variable calculator calculates a calculation value of a limit variable for limiting the command current. A determiner determines, based on a relationship between the value of the motor current and the calculation value of the limit variable, whether the motor current is in a less-response situation to change of the command current. A current limiter determines whether to limit a value of the command current based on the calculation value of the limit variable in accordance with a result of the determination of whether the motor current is in the less-response situation to change of the command current.

A power steering apparatus has a first actuator provided as a multi-phase rotating electric machine and disposed on a steering column side of an intermediate shaft and a second actuator disposed on a rack gear side thereof. A first ECU controls a drive of the first actuator and detects an abnormality of the first actuator. The first ECU changes an output of the first actuator based on a notification from a communication bus. The first ECU performs an initial diagnosis of the first actuator at a vehicle startup time for detecting abnormality, by supplying an electric power to the first actuator for not providing a torque to a steering wheel.

A control device is provided for a three-phase rotary machine including two three-phase-winding sets. The control device includes two power converters for outputting alternating currents with a same amplitude and a phase difference of (3060n) degrees to the two three-phase-winding sets and a control unit for controlling energization of the three-phase rotary machine by calculating a d-axis current and a q-axis current of a 6(2k+1)th component to be superimposed on a fundamental wave component on dq coordinates so as to reduce a phase current peak value. The control unit calculates currents so that a high-order dq amplitude ratio is 0 when a fundamental wave current amplitude is a first threshold or less, and the high-order dq amplitude ratio is 1 when the fundamental wave current amplitude is larger than a second threshold.

A shaft for a steering device has a first portion, a second portion, and a third portion that is a shaft integrated with the first portion and the second portion and couples the first portion and the second portion in a first direction. The outer diameter of the third portion is smaller than the length of the second portion in a second direction intersecting with the first direction, and is constant across a direction extending along the first direction. The hardness of the third portion is greater than the hardness of the second portion, and is constant across the direction extending along the first direction.

A power converter includes: an inverter that includes an upper arm element and a lower arm element, and converts electric power supplied from a DC power source via a power wiring so as to supply the electric power to a load; a driver that receives electric power supplied from the DC power source via a control wiring, and applies gate voltage to the upper arm element and the lower arm element; and a controller that includes a drive controller controlling operation of the upper arm element and the lower arm element in accordance with a current command value.

Provided is a motor device capable of detecting entry of water into a housing before a control circuit is submerged. A first motor bus bar includes a first U-phase motor bus bar, a first V-phase motor bus bar, and a first W-phase motor bus bar. A first control circuit is connected to the first motor bus bar. The first U-phase motor bus bar, the first V-phase motor bus bar, and the first W-phase motor bus bar are disposed on the lower side with respect to the first control circuit in a gravity direction. The first control circuit detects entry of water into a motor housing of the motor device, based on the status of power supply to the first U-phase motor bus bar, the first V-phase motor bus bar, and the first W-phase motor bus bar.