Three-phase system electronically commutated DC motor
A DC motor and electronic commutation technology, which is applied in the direction of speed/torque control of a single motor, and can solve the problems of not wide speed regulation range, limited capacity, and difficulty in promotion.
Inactive Publication Date: 2016-04-20
周道齐
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Problems solved by technology
[0002] Among the traditional motors, although the DC motor has good speed regulation performance, due to the complex structure of its mechanical rectifier, the cost is high, sparks will be generated when the load is heavy, the capacity is limited, and the reliability is also affected.
The AC motor is simple in structure, low in cost, reliable in use, and is popular among users. Although there are many methods of AC speed regulation, except for variable voltage and frequency control, the speed regulation performance of other methods is not ideal, and the speed regulation range is not wide. , the efficiency is not high, and it has been difficult to compete with the DC speed control system
Although variable voltage variable frequency speed regulation has good performance, the traditional speed regulation device is a frequency conversion unit, the equipment is relatively complicated, and it is difficult to popularize
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[0098] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0099] The invention constitutes a "three-phase structure DC motor speed regulation system", that is, a motor with external direct current and internal AC, which can perform voltage regulation and speed regulation below the rated speed and magnetic field regulation and speed increase above the rated speed. Such as Figure 7 shown.
[0100] Figure 7 Middle: RP n --- Adjust the potentiometer below the rated speed, RP f---Adjust potentiometer above rated speed, ASR---speed regulator, ACR---current regulator, AUR---voltage regulator, AER---back EMF regulator, AFR---excitation current regulator 1TVD, 2TVD--main circuit DC voltage isolation converter, AE---back electromotive force device, TG---tacho generator (can be made by drawing a white barcode on the rotor fan and applying the barcode identification method speed sensor), VFC---excitation ...
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The invention discloses a three-phase system electronically commutated DC motor, which is a three-phase synchronous motor using SVPWM control. The three-phase system electronically commutated DC motor uses a non-independent multi-phase winding as a stator winding and uses an electronic commutator for control, the stator winding adopts a three-phase system and uses a distributed and short moment winding, so that the higher harmonic wave can be suppressed, and a magnetic field in approximate sinusoidal distribution is obtained; SVPWM power supply is conducted for a three-phase fully controlled bridge inverter, and the number of cells (shown in the description) when sector division is performed for the SVPWM is enabled to be equal to or greater than the number of slots per pole and per phase. The three-phase system electronically commutated DC motor can reduce the cost and improve the stability while giving full play to the speed control advantage of the electronically commutated DC motor, and therefore overcomes the shortcomings in the prior art.
Description
technical field [0001] The invention relates to the technical field of motors, in particular to a three-phase electronically commutated DC motor. Background technique [0002] Among the traditional motors, although the DC motor has good speed regulation performance, its mechanical rectifier has a complex structure, high cost, sparks will be generated when the load is heavy, the capacity is limited, and the reliability is also affected. The AC motor is simple in structure, low in cost, reliable in use, and is popular among users. Although there are many methods of AC speed regulation, except for variable voltage and frequency control, the speed regulation performance of other methods is not ideal, and the speed regulation range is not wide. , the efficiency is not high, and it has been difficult to compete with the DC speed control system. Although the variable voltage and frequency conversion speed regulation has better performance, the traditional speed regulation device i...
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IPC IPC(8): H02P6/08
Inventor 周道齐周坚
Owner 周道齐