Patent ID: 8558501
Filing Date: 2013-10-15
Classification: B64C,G05B,H02P

Abstract:
1. An aircraft motor drive control apparatus that drives a motor mounted to an aircraft for driving a device installed in the aircraft and that controls an operational status of the motor, the apparatus comprising: an inverter that includes a switching element and that drives the motor; and a control part that performs a pulse width modulation control of the inverter, the control part including: a command signal processing unit that outputs a PWM frequency control signal for controlling a PWM frequency, which is a switching frequency of the switching element, based on a signal from a controller that generates a speed command signal that commands a rotational speed of the motor for controlling operation of the device and a PWM frequency command signal for commanding the PWM frequency; and a PWM frequency control unit that controls the PWM frequency based on the PWM frequency control signal, wherein the command signal processing unit: receives one of a first PWM frequency command signal and a second PWM frequency command signal as the PWM frequency command signal, outputs, as the PWM frequency control signal when the first PWM frequency command signal is received, a high-PWM frequency command signal for causing the PWM frequency control unit to control the PWM frequency such that an asynchronous PWM control is performed at the PWM frequency of a predetermined constant frequency, and outputs, as the PWM frequency control signal when the second PWM frequency command signal is received, a low-PWM frequency command signal for causing the PWM frequency control unit to control the PWM frequency such that an asynchronous PWM control or a synchronous PWM control is performed at the PWM frequency in a frequency range lower than the predetermined constant frequency, and the PWM frequency control unit controls the PWM frequency such that an asynchronous PWM control is performed if the motor has a rotational speed less than a predetermined rotational speed and that a synchronous PWM control is performed if the motor has a rotational speed greater than the predetermined rotational speed, when the low-PWM frequency command signal is input as the PWM frequency control signal.