Abstract: A motor controlling device includes a high-side first switching element corresponding to each phase of a three-phase brushless motor, a low-side second switching element corresponding to each phase, a shunt resistor disposed between and connected to the second switching element and a grounding line, and a power controlling section for controlling the first switching element and the second switching element. The device further includes a decision section configured to effect abnormality decision based on a sum of values of currents flowing in the shunt resistors of all the phases acquired by using the power controlling section to switch OFF the first switching element of any one phase whose duty ratio is found equal to or greater than a threshold value for a predetermined period and also to switch ON the second switching element of the same one phase for the predetermined period.

Abstract: A motor controlling device includes a high-side first switching element corresponding to each phase of a three-phase brushless motor, a low-side second switching element corresponding to each phase, a shunt resistor disposed between and connected to the second switching element and a grounding line, and a power controlling section for controlling the first switching element and the second switching element. The device further includes a decision section configured to effect abnormality decision based on a sum of values of currents flowing in the shunt resistors of all the phases acquired by using the power controlling section to switch OFF the first switching element of any one phase whose duty ratio is found equal to or greater than a threshold value for a predetermined period and also to switch ON the second switching element of the same one phase for the predetermined period.

Abstract: An inverter apparatus includes: an inverter including three high-voltage side switching elements and three low-voltage side switching elements respectively provided in three phases one by one, and driving a three-phase brushless motor; an opening and closing control unit performing controlling so as to cause an electrical angle of the motor to pass through an angle corresponding to a first combination, to rotate twice by 120° each time to one side in a rotary direction, and to rotate once by 120° to the other side in the rotary direction thereafter, by sequentially closing four combinations each of which is formed with one among the high-voltage side switching elements and one among the low-voltage side switching elements; and a detection unit detecting a conduction state of a circuit including the closed high-voltage side and low-voltage side switching elements, wherein all the high-voltage side and low-voltage side switching elements are closed at least once in the four combinations.

Abstract: An inverter apparatus includes: an inverter including three high-voltage side switching elements and three low-voltage side switching elements respectively provided in three phases one by one, and driving a three-phase brushless motor; an opening and closing control unit performing controlling so as to cause an electrical angle of the motor to pass through an angle corresponding to a first combination, to rotate twice by 120° each time to one side in a rotary direction, and to rotate once by 120° to the other side in the rotary direction thereafter, by sequentially closing four combinations each of which is formed with one among the high-voltage side switching elements and one among the low-voltage side switching elements; and a detection unit detecting a conduction state of a circuit including the closed high-voltage side and low-voltage side switching elements, wherein all the high-voltage side and low-voltage side switching elements are closed at least once in the four combinations.