Magnetic bearing compressor, air conditioner, and protective air gap value setting method

Patent metadata

Field	Value
Publication number	US-11965685-B2
Application number	US-201917418834-A
Country	US
Kind code	B2
Filing date	Jul 8, 2019
Priority date	Dec 29, 2018
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

Provided are a magnetic bearing compressor, an air conditioner and a protective air gap value setting method. The magnetic bearing compressor includes: a rotor, a magnetic bearing, a sensor, and a control device. The magnetic bearing is sleeved on the rotor; the sensor is arranged on the magnetic bearing and is configured to detect a distance value between the rotor and the sensor on a preset plane; the control device is configured to receive the distance value and determine the minimum distance value and the maximum distance value between the rotor and the magnetic bearing according to the distance value, and obtain an absolute value of a difference of the maximum distance value and the minimum distance value; and the control device obtains a protective air gap value according to the absolute value and a preset protection coefficient when the absolute value is less than or equal to a preset air gap value.

First claim

What is claimed is:

1. A magnetic bearing compressor, comprising:
a rotor;
a magnetic bearing, sleeved on the rotor;
a sensor, arranged on the magnetic bearing and configured to detect a distance value between the rotor and the sensor on a preset plane; and
a control device, configured to:
receive the distance value and determine a minimum distance value and a maximum distance value between the rotor and the magnetic bearing according to the distance value;
obtain an absolute value of a difference between the maximum distance value and the minimum distance value; and
obtain a protective air gap value according to the absolute value and a preset protection coefficient when the absolute value is less than or equal to a preset air gap value.

2. The magnetic bearing compressor of claim 1 , wherein the control device is further configured to:
set a product of the preset air gap value and the preset protection coefficient as the protective air gap value when the absolute value is greater than the preset air gap value.

3. The magnetic bearing compressor of claim 2 , wherein the control device is further configured to:
alternately send a first electric signal and a second electric signal to the magnetic bearing within a first preset duration;
control, by the first electric signal, the magnetic bearing to attract the rotor in a first direction where the sensor is located until the rotor is in contact with the magnetic bearing;
control, by the second electric signal, the magnetic bearing to attract the rotor in a direction opposite to the first direction until the rotor is in contact with the magnetic bearing; and
acquire the distance value between the rotor and the sensor on the preset plane within the first preset duration to determine the minimum distance value and the maximum distance value.

4. The magnetic bearing compressor of claim 2 , wherein the magnetic bearing comprises a first magnetic bearing and a second magnetic bearing, and the sensor comprises a first sensor and a second sensor;
wherein the first magnetic bearing is provided with the first sensor, and the second magnetic bearing is provided with the second sensor.

5. The magnetic bearing compressor of claim 4 , wherein the control device is further configured to:
alternately send a third electric signal and a fourth electric signal to the first magnetic bearing within a second preset duration;
control, by the third electric signal, the first magnetic bearing to attract the rotor in a second direction where the first sensor is located until the rotor is in contact with the first magnetic bearing;
control, by the fourth electric signal, the first magnetic bearing to attract the rotor in a direction opposite to the second direction until the rotor is in contact with the first magnetic bearing;
determine a first maximum distance value and a first minimum distance value between the rotor and the first sensor within the second preset duration;
obtain a first absolute value of a difference of the first maximum distance value and the first minimum distance value; and
determine a first protective air gap value of the first magnetic bearing according to the first absolute value.

6. The magnetic bearing compressor of claim 5 , wherein the control device is further configured to:
send a fifth electric signal to the second magnetic bearing while sending the third electric signal to the first magnetic bearing within the second preset duration;
send a sixth electric signal to the second magnetic bearing while sending the fourth electric signal to the first magnetic bearing;
control, by the fifth electric signal, the second magnetic bearing to attract the rotor in a third direction where the second sensor is located until the rotor is in contact with the second magnetic bearing;
control, by the sixth electric signal, the second magnetic bearing to attract the rotor in a direction opposite to the third direction until the rotor is in contact with the second magnetic bearing;
determine a second maximum distance value and a second minimum distance value between the rotor and the second sensor within the second preset duration;
obtain a second absolute value of a difference of the second maximum distance value and the second minimum distance value; and
determine a second protective air gap value of the second magnetic bearing according to the second absolute value;
wherein the third direction is opposite to the second direction.

7. The magnetic bearing compressor of claim 1 , wherein the preset plane is a plane where the sensor is located and which is perpendicular to an axis of the magnetic bearing; and
the preset protection coefficient is a natural number greater than 0 and less than 1.

8. An air conditioner, comprising the magnetic bearing compressor of claim 1 .

9. A protective air gap value setting method, for the magnetic bearing compressor of claim 1 , comprising:
controlling a sensor to detect a distance value between a rotor and the sensor on a preset plane;
receiving the distance value and determining a minimum distance value and a maximum distance value between the rotor and the magnetic bearing according to the distance value;
obtaining an absolute value of a difference of the maximum distance value and the minimum distance value; and
obtaining a protective air gap value according to the absolute value and a preset protection coefficient when the absolute value is less than or equal to a preset air gap value.

10. The protective air gap value setting method of claim 9 , further comprising:
setting a product of the preset air gap value and the preset protection coefficient as the protective air gap value when the absolute value is greater than the preset air gap value.

11. The protective air gap value setting method of claim 10 , wherein determining a minimum distance value and a maximum distance value between the rotor and the magnetic bearing according to the distance value comprises:
alternately sending a first electric signal and a second electric signal to the magnetic bearing within a first preset duration;
controlling, by the first electric signal, the magnetic bearing to attract the rotor in a first direction where the sensor is located until the rotor is in contact with the magnetic bearing;
controlling, by the second electric signal, the magnetic bearing to attract the rotor in a direction opposite to the first direction until the rotor is in contact with the magnetic bearing; and
acquiring the distance value between the rotor and the sensor on the preset plane within the first preset duration to determine the minimum distance value and the maximum distance value.

12. The protective air gap value setting method of claim 10 , wherein the magnetic bearing comprises a first magnetic bearing and a second magnetic bearing, and the sensor comprises a first sensor and a second sensor;
wherein the first magnetic bearing is provided with the first sensor, and the second magnetic bearing is provided with the second sensor.

13. The protective air gap value setting method of claim 12 , wherein determining a minimum distance value and a maximum distance value between the rotor and the magnetic bearing according to the distance value comprises:
alternately sending a third electric signal and a fourth electric signal to the first magnetic bearing within a second preset duration;
controlling, by the third electric signal, the first magnetic bearing to attract the rotor in a second direction where the first sensor is located until the rotor is in contact with the first magnetic bearing;
controlling, by the fourth electric signal, the first magnetic bearing

Assignees

• Hefei Midea Heating & Ventilating Equipment Co Ltd
• Gd Midea Heating & Ventilating Equipment Co Ltd
• Gd Midea Heating & Ventilating Equipment Co Ltd Foshan Cn

Inventors

• Yang Bin
• Wang Fengshuang

Classifications

• F25B49/022 Primary

  Compressor control arrangements · CPC title

• F24F11/30

  for purposes related to the operation of the system, e.g. for safety or monitoring · CPC title

• F24F11/64

  using pre-stored data · CPC title

• F04C23/00 Primary

  Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids (F04C25/00 takes precedence) · CPC title

• F25B49/02 Primary

  for compression type machines, plants or systems · CPC title