The motor is divided into DC motor and AC motor. DC motor is divided into brushless and brushless. DC brushless motor is developed on the basis of brushed motor. But its drive current is an uncompromising exchange. A general brushless motor, that is, a brushless DC motor, has two kinds of driving currents: one is a trapezoidal wave and the other is a sine wave.
The scientific name of the brushless DC motor is “No commutator motor†or “No commutator motor†is a new type of continuously variable motor with a synchronous motor and a set of inverter bridges. It has the same speed regulation characteristics as the DC motor, but it is simpler in construction, more convenient to manufacture, and does not require frequent maintenance. It is an ideal variable speed motor because of its brushless nature, that is, without a commutator.
How does the brushless DC motor run?
Brushless DC motors have a synchronous motor and driver and are a typical mechatronic product. The stator windings of the synchronous motor are mostly made into a three-phase symmetrical star connection method, which is very similar to the three-phase asynchronous motor. The permanent magnet magnetized on the rotor is adhered to detect the polarity of the rotor of the motor, and the position sensor is installed in the motor. The driver is composed of a power device and an integrated circuit. Its function is to accept motor start, stop, and brake signals. To control the operation of the motor. The position sensor signal and the forward and reverse signals are used to control the on/off of the inverter bridge power tubes, generate continuous torque, receive speed commands and speed feedback signals, and are used to control and adjust the speed to provide protection and display.
What is unique about brushless DC motors?
(1) Large capacity range: Standard products can reach 400KW, and larger capacity can be customized.
(2) Many types of voltage: DC power supply, AC high and low voltage are not limited
(3) The low frequency torque is large: the low speed can reach the torque output, and the activation torque can be doubled or higher.
(4) High-speed operation: no more than 1 rpm (without voltage fluctuation or load change)
(5) High efficiency: All speed control devices have the highest efficiency, which is 5~30% higher than traditional DC motors .
(6) Speed ​​adjustment range: simple type / general type (1:10), high precision type (1:100), servo type.
(7) High overload capacity: The load torque varies within 200% of the output speed.
(8) Large volumetric elasticity: Actually smaller than the size of the asynchronous motor, it can be made into various shapes.
(9) It can be designed as an outer rotor motor (stator rotation).
(10) The rotation speed is large: it can be turned to 10 to 106 rpm.
(11) Good braking characteristics: Four-quadrant operation is available.
(12) It can be designed to be fully enclosed, IP-54, IP-65. Explosion-proof type.
(13) Allow high frequency to be activated quickly and the motor is not hot.
(14) The universal product installation size is the same as that of a general asynchronous motor, which is easy to be technically modified.
What are the advantages of brushless DC motors?
Brushless DC motor adopts square wave self-controlled permanent magnet synchronous motor, replaces carbon brush commutator with Hall sensor, and uses NdFeB as permanent magnet material of rotor. Its performance surpasses all the advantages of traditional DC motor and solves DC. The shortcomings of the motor carbon brush slider, digital control, is the most ideal speed-regulating motor.
The brushless DC motor has the characteristics of high efficiency, high speed, high precision and high precision. It is small in size, light in weight, and can be used in various volume shapes. It is widely used in military, information industry, equipment office equipment, home appliance industry in advanced countries. DIY hand tools, servo systems, electric cars, battery cars, maglev trains and other industries.
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