Control system and control method of brushless DC motor
A brushless DC motor and control system technology, applied in control systems, electronic commutation motor control, electrical components, etc., can solve problems such as reducing the control performance of brushless DC motors, improve control performance, eliminate errors, and simplify hardware circuits Effect
Active Publication Date: 2018-03-09
GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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Problems solved by technology
Although this method does not need to know the neutral point of the three-phase winding of the brushless DC motor, it still needs a low-pass filter to filter the voltage signal, so that there is a deviation between the detected commutation point and the actual commutation point, reducing the Control performance of brushless DC motor
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[0023] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0024] The control system of the brushless DC motor and the control method of the brushless DC motor according to the embodiments of the present invention will be described below with reference to the accompanying drawings.
[0025] figure 1 It is a schematic circuit diagram of a control system of a brushless DC motor according to an embodiment of the present invention. Such as figure 1 As shown, the control system of the brushless DC motor includes a DC bus 10, an inverter 20, a resistor network 30 and a controller (not specif...
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The invention discloses a control system and a control method for a brushless direct current motor. The control system for the brushless direct current motor comprises a direct current bus connected with a power supply, an inverter connected between the direct current bus and the brushless direct current motor, a resistance network connected with a first node, a second node and a third node, and a controller used for detecting the voltage of each of a first middle point and a second middle point and controlling the brushless direct current motor according to the zero-cross point of the voltage between the first middle point and the second middle point, wherein the direct current bus has the first middle point; the inverter has the first node, second node and third node connected with end points of a three-phase stator winding of the brushless direct current motor; the resistance network has the second middle point. The control system for the brushless direct current motor is capable of precisely controlling the brushless direct current motor according to the zero-cross point of the voltage between the first middle point and the second middle point, the hardware circuit is simplified, and the system cost is lowered.
Description
technical field [0001] The invention relates to the technical field of motors, in particular to a control system of a brushless direct current motor and a control method of a brushless direct current motor. Background technique [0002] Sensorless control techniques for BLDC motors include the back EMF method, which includes the third harmonic method. [0003] In the traditional third harmonic method, the voltage signal between the midpoint of the resistor network and the neutral point of the three-phase winding of the brushless DC motor is first detected, and then the high-frequency PWM (Pulse Width Modulation, pulse width modulation) is filtered out by a low-pass filter. ) signal to obtain the third harmonic signal of the back electromotive force of the brushless DC motor, and finally detect the zero-crossing point of the filtered third harmonic signal and shift the phase by an electrical angle of 30° to obtain the commutation of the three-phase winding of the brushless DC...
Claims
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IPC IPC(8): H02P6/18H02P6/182
CPCH02P6/182H02P6/188
Inventor 肖有文
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD