Direct current generator
A dc generator is a machine that converts mechanical energy into direct current energy. It is mainly used as direct current motor, electrolysis,
Dc motor for electroplating, electrolytic smelting, charging and ac generator excitation power supply. Although in the direct current (dc) are needed, also use power rectifier devices, converts alternating current into direct current, but in some performance ways, rectifier ac power supply can not completely replace the dc generator.
A rotating device that converts direct current to mechanical energy. The motor stator provides a magnetic field, and the dc supply provides current to the rotor winding. The commutator keeps the torque of the rotor current and magnetic field in the same direction. There are two types of dc motor, including brushless dc motor and brushless dc motor, according to whether or not there is a commonly used brush - commutator.
Brushless dc motor is the development of microprocessor technology and high switching frequency in recent years.
The application of low-power new power electronic devices, as well as the optimization of control methods and the emergence of low cost and high magnetic energy level permanent magnetic materials, have developed a new type of dc motor.
Brushless dc motor is good to keep the traditional dc motor speed control performance and has no sliding contact and commutation spark, high reliability, long service life and low noise advantages, thus in the aerospace, nc machine tools, robots, electric cars, computer peripheral equipment and household appliances, etc, have been widely used.
According to the different methods of power supply, and brushless dc motor can be divided into two categories: square-wave brushless dc motor, the back emf waveform and power supply current waveform is rectangular wave, also known as the square wave permanent magnet synchronous motor; Sine wave brushless dc motor, its anti - potential waveform and power supply current waveform are sine wave.
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