A method of power factor correction for permanent magnet synchronous motor
A power factor correction, permanent magnet synchronous motor technology, applied in the output power conversion device, electrical components, high-efficiency power electronic conversion, etc. The effect of reducing power consumption and reducing current
Active Publication Date: 2016-04-27
HAIER GRP CORP +1
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Problems solved by technology
However, with fully active PFC control, within one cycle, the number of switching times of the driver IGBT runs at full load, the switching loss increases, and the temperature rise increases, which leads to the need to use an IGBT with a large rated current, and at the same time increase the heat dissipation device, and the heat dissipation volume increase, leading to an increase in cost
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[0039] The technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments.
[0040] figure 2 It is a system block diagram for performing PFC control of a permanent magnet synchronous motor according to an embodiment of the present invention. like figure 2As shown, the system for performing PFC control of a permanent magnet synchronous motor includes a PFC main circuit composed of a rectifier circuit and a PFC control circuit, a synchronous motor PWM inverter, a synchronous motor, and a synchronous motor for controlling the PFC main circuit and the synchronous motor PWM Inverter data processor. Among them, the AC power supply Vs is connected to the PFC main circuit, and the PFC main circuit smoothes the AC voltage Vs into a DC voltage E through rectification d , and the DC voltage E d Input to synchronous motor PWM inverter. The synchronous motor PWM inverter converts the DC voltage E ...
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The invention discloses a power factor correcting method for a permanent magnet synchronous motor. According to the power factor correcting method for the permanent magnet synchronous motor, a step-up ratio needed by a system is adjusted automatically according to a load, a chopping stopping condition is set according to the step-up ratio, then an on-off area of a power switch within a voltage waveform cycle can be effectively controlled, the average supply current is lower than a preset value at the moment when the permanent magnet synchronous motor operates at a low frequency, and power factor correction is not conducted; the average supply current is higher than or equal to the preset value at the moment when the permanent magnet synchronous motor operates at a medium-high frequency, the step-up ratio needed by the system within the cycle is set to be a set value, a control condition value for increasing the step-up ratio is set, the step-up ratio is increased when the condition value is met to enable the power factor correction on-off range to be widened or complete active power factor correction to be achieved, and then supply voltage is effectively used to enable the motor to operate at a higher frequency.
Description
technical field [0001] The invention relates to the field of permanent magnet synchronous motor control, in particular to a power factor correction method for a permanent magnet synchronous motor. Background technique [0002] The inverter air conditioner embodies the application achievements of modern power electronic technology and microelectronic control technology. It has the advantages of energy saving, high efficiency and comfort, and has broad development prospects. However, due to the characteristics of frequency converter power supply and the particularity of compressor operation, ordinary asynchronous motors often have problems such as low efficiency and high noise, and it is difficult to achieve better operating performance. Permanent magnet synchronous motor has the characteristics of simple structure, small size, light weight, low loss and high efficiency. Compared with asynchronous motors, it does not require reactive excitation current, so it has high efficie...
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IPC IPC(8): H02M1/42
CPCY02B70/10
Inventor 王友宁程永甫刘聚科
Owner HAIER GRP CORP