摘要:
A calibration method in which, a rotation angle calculation device (20, 30) calculates (S2) a rotation angle θc based on a detection signal of a sensor, transmits (S3) rotation angle data Dc indicating the rotation angle θc to a calibration device (40), and transmits (S3) time difference data Dt relating to a time difference after having captured the detection signal until transmitting the rotation angle data to the calibration device, and in which the calibration device measures (S1) a rotation angle θr, clocks (S1, S4) a measurement time tm at which the rotation angle θr is measured and a transmission time tt of transmitting or receiving the rotation angle data, and acquires (S5, S6) calibration data Dc of the rotation angle data by comparing the rotation angle θr measured at a time tc2 obtained by going back in time from the transmission time tt by the time difference after having captured the detection signal until transmitting the rotation angle data and the rotation angle data Da with each other.
摘要:
A rotation angle sensor including: a magnet (10) fixed to an end (5) on an opposite side to an output end (4) of a rotation shaft (3) of a motor (2); a circuit board (11) on which a plurality of magnetic resistance sensor elements (20, 21) are mounted; and a support member (12) fixed to the motor (2), wherein the circuit board (11) is arranged between the support member (12) fixed to the motor (2) and the motor (2) and is fixed to the support member (12) in such a way that the plurality of magnetic resistance sensor elements (20, 21) come close to the magnet (10).
摘要:
To make it possible to continuously control driving of a multi-phase electric motor even if an open failure or a short circuit failure occurs in a multi-phase inverter circuit driving the electric motor. A motor control apparatus includes a motor current shutoff unit inserted between a multi-phase inverter circuit and the multi-phase electric motor to shut off a current for each of plural phases, the multi-phase inverter circuit including an arm driving the multi-phase electric motor for each of the plural phases, a redundant arm unit including one or more arms whose number is less than the number of the plural phases of the multi-phase inverter circuit, a connection selecting unit selecting which one of windings of the multi-phase electric motor is to be connected to each of the one or more arms of the redundant arm unit, an abnormal arm detection unit detecting an abnormality in each of the plural phases of the multi-phase inverter circuit, and an abnormality control unit controlling the motor current shutoff unit to shut off connection between an abnormal arm and the multi-phase electric motor when the abnormal arm detection unit detects the abnormal arm, and to control the connection selecting unit to connect at least one of the one or more arms of the redundant arm unit to a winding of the multi-phase electric motor, the winding is shut off by the motor current shutoff unit.
摘要:
A detection signal correction method includes: calculating (S1) a rotation angle of a rotation shaft of a motor (10), based on a detection signal of a sensor (20); calculating (S2) a steering velocity of a steering shaft based on the rotation angle; calculating (S5) an error of the detection signal; and correcting (S7, S9) the error of the detection signals when the steering velocity is equal to or greater than a steering velocity threshold value and the error of the detection signal is equal to or greater than an error threshold value.
摘要:
A physical quantity detecting device that can determine abnormality of a signal transmission system between a physical quantity detector and a controller and an electric power steering apparatus using the physical quantity detecting device are provided.. The physical quantity detecting device includes a physical quantity detector (3) configured to detect a physical quantity and to output a physical quantity detection signal and a controller (31) configured to receive the physical quantity outputted from the physical quantity detector via a transmission line and to perform a control operation on the basis of the physical quantity. The physical quantity detector (3) outputs a diagnostic signal for detecting abnormality of a transmission system between the controller and the physical quantity detector and the controller (31) includes an abnormality determining unit (31a) configured to determine abnormality of the transmission system on the basis of the diagnostic signal when receiving the diagnostic signal.