Abstract: An electric motor drive apparatus includes an electric motor. A power conversion device, a controller, and a current detector. The controller calculates a phase of an armature flux linkage of the electric motor by using a flowing current detected by the current detector. The calculating a phase of an armature flux linkage of the electric motor includes calculating an armature flux linkage of the electric motor including an initial value of an armature flux linkage of the electric motor which is calculated from a rotational position of the electric motor estimated by using a motor flux of the electric motor measured in advance and the flowing current.

Abstract: According to an embodiment, single phase motor drive circuit includes a counter unit, an energization pattern generation unit, and a drive unit. The unit counts a time of phase switching of a Hall signal based on a clock signal. The energization pattern generation unit generates an energization pattern based on the count result of the counter unit. The drive unit generates a pulse width modulation (PWM) signal based on a duty setting signal and the energization pattern signal to output an output signal to drive a single phase motor based on the PWM signal.

Abstract: A controlling circuit of the brushless motor driving circuit turns on a switch circuit to provide an electrical conduction between a fixed potential and a neutral point or an electrical conduction between the fixed potential and a first to third output nodes, in a case where the first to third output node bring into a floating state when a three-phase brushless motor is rotating.

Abstract: A controlling circuit of the brushless motor driving circuit turns on a switch circuit to provide an electrical conduction between a fixed potential and a neutral point or an electrical conduction between the fixed potential and a first to third output nodes, in a case where the first to third output node bring into a floating state when a three-phase brushless motor is rotating.

Abstract: According to an embodiment, single phase motor drive circuit includes a counter unit, an energization pattern generation unit, and a drive unit. The unit counts a time of phase switching of a Hall signal based on a clock signal. The energization pattern generation unit generates an energization pattern based on the count result of the counter unit. The drive unit generates a pulse width modulation (PWM) signal based on a duty setting signal and the energization pattern signal to output an output signal to drive a single phase motor based on the PWM signal.

Abstract: A brushless motor drive circuit has a first AD converter which converts a voltage value depending upon a power supply voltage supplied from a power supply to drive a three-phase brushless motor, to a digital signal and outputs the digital signal. The brushless motor drive circuit has an energization timing adjustment circuit which outputs an adjustment signal for adjusting a lead angle value or a lag angle value of energization timing of the three-phase brushless motor, in response to the digital signal which is output by the first AD converter. The brushless motor drive circuit has an energization timing setting circuit which sets the energization timing of the three-phase brushless motor.

Abstract: A brushless motor drive circuit has a first AD converter which converts a voltage value depending upon a power supply voltage supplied from a power supply to drive a three-phase brushless motor, to a digital signal and outputs the digital signal. The brushless motor drive circuit has an energization timing adjustment circuit which outputs an adjustment signal for adjusting a lead angle value or a lag angle value of energization timing of the three-phase brushless motor, in response to the digital signal which is output by the first AD converter. The brushless motor drive circuit has an energization timing setting circuit which sets the energization timing of the three-phase brushless motor.