Brushless dc motor with a dc motor

Brushless dc motor is a kind of synchronous motor, that is to say, the motor rotor speed of the motor speed rotating magnetic field of the stator and rotor pole impact: the number of the rotor fixed cases, change the frequency of the stator rotating magnetic field can change the speed of the rotor. Brushless dc motor is a synchronous motor with electronic control ( Drive) , control the frequency of the stator rotating magnetic field and the motor rotor speed feedback to the control center of repeated correction, in order to achieve close to the way the characteristics of dc motor. That is to say, brushless dc motor can be within the rated load when the load changes can still maintain control motor rotor speed. Brushless dc motor is generally want to use in the speed can be stable in value when the load changes will not change speed control, so the motor can be induced magnetic field of hall sensor mounted inside as the closed loop control of speed, and at the same time as the basis of phase sequence control. But that is only used as a speed control and is not to be used as a positioning control.


brushless dc motor of the machine itself is electromechanical energy conversion part, it besides motor armature, permanent magnet excitation two points, also with sensors. itself is the core of the brushless dc motor, it is not only related to the performance index, noise, vibration, reliability and service life, etc. , involving the manufacturing costs and product cost. Because use permanent magnet magnetic field, make the brushless dc motor from the traditional design and structure of the dc motor commonly, meet the requirements of various applications market, and development in the direction of the province copper material saving, simple and convenient manufacturing. Permanent magnet magnetic field is closely related to the application of permanent magnetic material, the development of the third generation of the application of permanent magnetic material, make brushless dc motor to efficiency, miniaturization, energy-saving direction.

is a dc motor with brush electric drill speed reducer will direct current can be converted into mechanical energy or mechanical energy is converted into direct current to the rotation of the motor. A dc motor is the basis of so motor, it has quick start, brake in time, can be smooth speed regulation in large scope, the control circuit is relatively simple. Permanent magnet dc motor no stator winding. Batteries provide a constant dc voltage. Decided to the speed of the motor, voltage amplitude changes with dc motor speed is the most effective way is to use pulse width modulation technology.


with dc planetary gear motor reversing has been through graphite brush and mounted on the rotor commutator ring in contact. The brushless dc planetary gear motor is by hall sensor put back the rotor position feedback control circuit, so it can learn the exact time of the motor phase commutation.
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