急求：高手帮我汉译英（非机译）十分感谢

Actuator is building automation systems, it is an important part of the function and performance directly influences the effect of control. Actuator is automatic control system, the operation is based on the role of control signal controller is operated by the size of the medium change, you will be charged variable required on maintaining.
Brushless dc motor with its light weight, small size, accelerating performance is good, stable operation, low noise and DingYe and widely used in civil products. Brushless dc motor of high power factor, no rotor losses, the rotor speed and power frequency to strictly keep pace. The rotor magnetic field generated by the permanent magnet. Usually, use voltage source type pulse width modulation (PWM) control as brushless dc motor control system with the driver. In recent years, have foreign takes microcontroller (MCU) as the core of the motor controller, it is equipped with a MCU periphery drive circuits again, can greatly reduce the cost, narrow, compact structure, raise volume of reliability. In this Atmega48 microcontroller is introduced, the three-phase brushless dc motor controller.
This feature is using the brushless dc motor and the power factor of it, and no rotor losses, so for brushless dc motor control system adopts the most drive voltage source PWM control and type ATmega 48 SCM by software with the death of PWM, hall-effect sensor of commutation, sine signals and drive motor speed control, and the peripheral devices needed less, low cost, and also can improve the reliability of the system.