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Brushless motor of the general indicators
- Oct 13, 2017 -

DC brushless motor motor itself is part of the electromechanical energy conversion, which in addition to motor armature, permanent magnet excitation two parts, but also with a sensor. The motor itself is the core of the brushless DC motor, it is not only related to performance indicators, noise, vibration, reliability and service life, but also related to manufacturing costs and product costs. As a result of the use of permanent magnetic field, so that the brushless DC motor from the general design and structure of the DC motor to meet a variety of application market requirements, and toward the province of copper materials, manufacturing easy direction. The development of permanent magnetic field is closely related to the permanent magnet material, and the application of the third generation permanent magnet material promotes the brushless motor to move towards high efficiency, miniaturization and energy saving.

In order to achieve the electronic commutation must have a position signal to control the circuit. Early use of electromechanical position sensor to obtain the position signal, has been gradually using electronic position sensor or other methods to get the position signal, the easiest way is to use the armature winding potential signal as the position signal.

To achieve the motor speed control must have a speed signal. The speed signal is obtained by obtaining the position signal similar method. The simplest speed sensor is the combination of the frequency measuring generator and the electronic circuit.

DC brushless motor commutation circuit by the drive and control of two parts, these two parts are not easy to separate, especially low-power circuit is often integrated into a single dedicated ASIC.

In the larger power of the motor, the drive circuit and control circuit can be integrated into one. The driving circuit outputs the electric power, drives the armature winding of the motor and is controlled by the control circuit. At present, the drive circuit has been changed from the linear amplification state to pulse width modulation of the switch state, the corresponding circuit components from the transistor discrete circuit into a modular integrated circuit.

Modular integrated circuit with power bipolar transistor, power FET and isolation gate field effect bipolar transistor and other forms of composition.

The control circuit is used to control the motor speed, steering, current (or torque) and protection of the motor over-current, over-voltage, overheating and so on. The above parameters are easy to turn into analog signals, use this to control more simple, but from the development point of view, the motor parameters should be converted into digital, through the digital control circuit to control the motor. At present, the control circuit with special integrated circuits, microprocessors and digital signal processor and other three components. The use of digital signal processor control circuit is the future direction of development.

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