A kind of PG motor control method, 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: 2019-10-11
AUX AIR CONDITIONING LTD BY SHARE LTD
View PDF4 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of PG motor control method, device and air conditioner
  • A kind of PG motor control method, device and air conditioner
  • A kind of PG motor control method, device and air conditioner

Examples

Experimental program
Comparison scheme
Effect test

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 a sufficient conduction pulse width when the load is heavy, and prevents 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: Obtain the power supply voltage frequency.

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

[0069] In sub-step S2011, the pulse width between two adjacent zero-crossing signals is obtained.

[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, where T is the period, P is the duty cycle.

[0071] Since the PG motor 4 is generally synchronized by the zero crossing of the AC voltage, the pulse width of the voltage signal input to the PG motor 4...

no. 2 example

[0105] See Figure 7 , Figure 7 It is a functional block diagram of a PG motor control device 5 provided by 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 in the above embodiment. For a brief description, for the parts not mentioned in this embodiment, please refer to the above implementation The 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 acquisition unit 6 is used to acquire the power supply voltage frequency.

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

[0108] Understandably, in an optional ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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 present invention relates to the technical field of air conditioners, in particular to a PG motor control method, device and air conditioner. Background technique [0002] The drive of PG motor is generally realized by thyristor or solid-state relay. The speed adjustment of PG motor is generally synchronized by the zero crossing of AC voltage. After zero crossing, the speed adjustment delay time is controlled according to the speed requirements. After the thyristor control The pin outputs a preset conduction pulse width (usually about 1ms, too large will cause low-speed control) to control the conduction of the thyristor, thereby controlling the voltage output to the PG motor to achieve speed regulation. [0003] However, thyristors are current-shut-off devices, which are generally self-shut-off at zero crossing of AC voltage. However, under abnormal heavy load conditions, the current zero point will lag behind the voltage zero crossing point. At this tim...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityPatents(China)
IPC IPC(8): H02P27/04
Inventor黄宁
OwnerAUX AIR CONDITIONING LTD BY SHARE LTD