高分求翻译一段话。

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PWM脉宽调制
控制IGBT的信号为正弦变化的PWM信号，PWM的占空比取决于速度信号的大小，它决定了加在电机绕组上的电压大小，从而决定了电机的转速，采用正弦变化的PWM是为了提高电机运行的平稳性，降低风机的噪声。单片机接收来自上位机的速度信号，用它控制PWM占空比，从而控制转速。单片机也接收启动/停止信号，如果得到停止信号，单片机输出输出控制信号关断所有6个IGBT，使电机绕组电压为0，电流为0，电机停转。如果接收到运行信号，单片机输出给IGBT的控制信号就由Hall信号和速度信号决定。
To control the signal of IGBT as the PWM signal with Sine variation, the duty ratio of PWM depends on the amplitude of the speed signal, and it determines the voltage level which is applied in the motor’s windings, thereby determining the rotation speed of the motor. Using Sine varied PWM is to increase the running stationarity of the motor, so as to reduce the noise of the blower. The single chip processor receives the speed signal from host computer to control the duty ratio of the PWM, thereby controlling the rotation speed.
It also receives Start/Stop signal, and if Stop signal is received it outputs control signal to stop all 6 IGBT, resulting in the voltage of motor windings being zero, current being zero, and motor stopped. On the other hand if running signal is received the single chip, the control signal that the single chip processor outputs to IGBTs will be determined by Hall signal and the speed signal.

Control igbt signal for the changes of pwm signal of pwm than speed up the signal on the size, it decided on the motor voltages of voltage to determine the size of the motor drive, the use of the changes of pwm is to increase the motor runs smoothly and reduce the noise of the blower. monolithic integrated circuits received from the upper machine speed, with its control of pwm empty, and rotational speed. monolithic integrated circuits to control and receiving signals the end, if given stop signals, single

IGBT control signal to the PWM signal for the sinusoidal, PWM duty cycle depends on the size of the speed signal, which determines the increase in the size of the voltage on the motor windings to determine the motor speed, change of use of sinusoidal PWM is to increase motor running stability, reduce fan noise. MCU receives the speed signal from the host computer, use it to control the PWM duty cycle to control speed. SCM also accept start / stop signal, if the stop signal, microcontroller output control signal off the output of all six IGBT, the motor winding voltage is 0, current is 0, the motor stall. If you receive a run signal, MCU output signals to the IGBT control signals and speed signals from the Hall decision.