PG motor control method and device and air conditioner

A technology of motor control and power supply voltage, which is applied in the direction of AC motor control, control systems, electrical components, etc., and can solve the problems of ineffective conduction of the conduction pulse width and motor control stalls, etc.

Active Publication Date: 2019-02-15
AUX AIR CONDITIONING LTD BY SHARE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the thyristor is a current shut-off device, which is generally self-shutoff when the AC voltage crosses zero. However, under abnormal heavy load conditions, the current zero point will lag behind the voltage zero point. As a result, the preset conduction pulse width cannot be effectively conducted, causing the motor to control stall

Method used

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  • PG motor control method and device and air conditioner
  • PG motor control method and device and air conditioner
  • PG motor control method and device and air conditioner

Examples

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no. 1 example

[0066] The embodiment of the present invention provides a PG motor control method, which is used to ensure that the PG motor 4 has sufficient conduction pulse width under the condition of heavy load, so as to prevent the PG motor 4 from stalling. see figure 2 , is a flowchart of a PG motor control method provided by an embodiment of the present invention. The PG motor control method includes:

[0067] Step S201, acquiring the frequency of the power supply voltage.

[0068] see image 3 , is a specific flowchart of step S201. This step S201 includes:

[0069] Sub-step S2011, acquiring the pulse width between two adjacent zero-crossing signals.

[0070] It should be noted that the zero-crossing signal is the signal at the time when the amplitude of the AC signal is zero. And since the pulse width w=T*P, wherein, T is a period, and P is a duty cycle.

[0071] Since the PG motor 4 is generally synchronized with the zero crossing of the AC voltage, the pulse width of the vo...

no. 2 example

[0105] see Figure 7 , Figure 7 A functional block diagram of a PG motor control device 5 provided for a preferred embodiment of the present invention. It should be noted that the basic principles and technical effects of the PG motor control device 5 provided in this embodiment are the same as those of the above-mentioned embodiment. For a brief description, the part not mentioned in this embodiment can refer to the above-mentioned implementation corresponding content in the example. The PG motor control device 5 includes: a parameter acquisition unit 6 , a calculation unit 7 , a conduction parameter determination unit 8 and a control unit 9 .

[0106] The parameter acquiring unit 6 is used to acquire the frequency of the power supply voltage.

[0107] Specifically, the parameter acquiring unit 6 is configured to acquire the pulse width between two adjacent zero-crossing signals, and determine the power supply voltage frequency based on the pulse width.

[0108] It can be ...

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Abstract

The invention provides a PG motor control method and device and an air conditioner, and relates to the technical field of air conditioners. According to the method and device, a power supply voltage frequency is obtained, a theoretical zero passage interval time of a zero passage signal is calculated on the basis of the power supply voltage frequency, a practical rotation speed value of a PG motoris obtained at the same time, a conduction parameter of the PG motor is determined on the basis of the practical rotation speed value and the theoretical zero passage interval time, and the operationof the PG motor is controlled on the basis of the conduction parameter. The conduction parameter is adjusted through the power supply voltage frequency and the practical rotation speed value of the PG motor, namely, a practical conduction pulse width and a practical delay time are adjusted, so that the condition that the practical conduction pulse width is small and the practical delay time is large is avoided, and enough conduction pulse width exists for control when current zero passage lagging voltage passes the zero under the condition that the load of the PG motor is relatively heavy, thereby ensuring the effective time of the conduction pulse width and avoiding the stall condition of the motor.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a PG motor control method and device and an air conditioner. Background technique [0002] The driving of PG motors is generally realized by silicon controlled rectifiers or solid state relays. The speed regulation of PG motors is generally synchronized with the zero crossing of AC voltage. Pin outputs a preset conduction pulse width (generally about 1ms, if it is too large, it will cause low-speed control not possible) to control the conduction of the thyristor, thereby controlling the voltage output to the PG motor to achieve speed regulation. [0003] However, the thyristor is a current shut-off device, which is generally self-shutoff when the AC voltage crosses zero. However, under abnormal heavy load conditions, the current zero point will lag behind the voltage zero point. As a result, the preset conduction pulse width cannot be effectively conducted, causing the ...

Claims

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Application Information

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IPC IPC(8): H02P27/04
Inventor黄宁
OwnerAUX AIR CONDITIONING LTD BY SHARE LTD