PERMANENT MAGNET MOTOR, COMPRESSOR AND REFRIGERATION SYSTEM

• US 20200136448A1
• Filed: 12/30/2019
• Published: 04/30/2020
• Est. Priority Date: 06/30/2017
• Status: Active Grant

• Current Assignee: Guangdong Meizhi Compressor Limited (Midea Group Co., Ltd)
• Original Assignee: Guangdong Meizhi Compressor Limited (Midea Group Co., Ltd)
• Inventors: QIAO, Zhengzhong, MAO, Linshu, QIU, Xiaohua, YU, Yangbo
• Granted Patent: US 11,177,705 B2
• Time in Patent Office: Days
• CPC Class Codes: F25B 2400/077 Compressor control units, e.g. terminal boxes, mounted on the compressor casing wall containing for example starter, protection switches or connector contacts
• CPC Class Codes: H02K 1/146 consisting of a generally annular yoke with salient poles
• CPC Class Codes: H02K 1/2766 having a flux concentration effect
• CPC Class Codes: H02K 11/33 Drive circuits, e.g. power electronics H02K11/38 takes precedence
• CPC Class Codes: H02K 21/14 with magnets rotating within the armatures
• CPC Class Codes: H02K 21/16 having annular armature cores with salient poles with homopolar co-operation H02K21/20
• CPC Class Codes: H02K 2203/06 Machines characterised by the wiring leads, i.e. conducting wires for connecting the winding terminations
• CPC Class Codes: H02K 2213/03 Machines characterised by numerical values, ranges, mathematical expressions or similar information
• CPC Class Codes: H02K 29/03 with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
• CPC Class Codes: H02K 3/28 Layout of windings or of connections between windings windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32

Abstract

Disclosed are a permanent magnet motor, a compressor and a refrigeration system. In the permanent magnet motor, the diameter D of a contour circle of the smallest inner periphery of a stator, the diameter d of a contour circle of the largest outer periphery of a rotor, the fundamental wave amplitude Bm1 of an air-gap flux density at an average gap between the stator and the rotor, the axial length L of the rotor, the total number of serially connected turns Ns of each phase winding, and a bus DC voltage Udc of a frequency converter supplying power to the permanent magnet motor before inversion are set as: 0.003 Udc≤(D+d)×L×Bm1×Ns≤0.008 Udc.

Claims

1. A permanent magnet motor comprising:

a stator and a rotor, the stator comprising a stator core and a stator winding, and the rotor comprising a rotor core and a permanent magnet provided on the rotor core,

wherein the stator winding comprises an A-phase winding, a B-phase winding, and a C-phase winding, the A-phase winding, the B-phase winding and the C-phase winding each comprising a first group of connectors and a second group of connectors;

wherein the second group of connectors of the A-phase winding and the first group of connectors of the B-phase winding are connected to a common lead-out wire;

the second group of connectors of the B-phase winding and the first group of the C-phase winding are connected to a common lead-out wire; and

the second group of connectors of the C-phase winding and the first group of connectors of the A-phase winding are connected to a common lead-out wire;

wherein a contour circle of the smallest inner periphery of the stator has a diameter D, a contour circle of the largest outer periphery of the rotor has a diameter d, an air-gap flux density at an average gap between the stator and the rotor has a fundamental wave amplitude Bm1, the rotor has an axial length L, the total number of serially connected turns of each phase winding is Ns, and a frequency converter supplying power to the permanent magnet motor has a bus DC voltage Udc before inversion; and

wherein the diameter D, the diameter d, the fundamental wave amplitude Bm1, the axial length L, the total number of serially connected turns Ns and the bus DC voltage Udc satisfy;

0.003 Udc≤

(D+d)×

L×

Bm1×

Ns≤

0.008 Udc.

2. The permanent magnet motor according to claim 1, wherein the bus DC voltage Udc satisfies:

250≤

Udc≤

540.

3. The permanent magnet motor according to claim 2, wherein the diameter D, the diameter d, the fundamental wave amplitude Bm1, the axial length L, and the total number of serially connected turns Ns satisfy:

1.2≤

(D+d)×

L×

Bm1×

Ns≤

4.0.

4. The permanent magnet motor according to claim 1, wherein the bus DC voltage Udc satisfies:

Udc≤

72.

5. The permanent magnet motor according to claim 4, wherein the diameter D, the diameter d, the fundamental wave amplitude Bm1, the axial length L, and the total number of serially connected turns Ns satisfy:

0.03≤

(D+d)×

L×

Bm1×

Ns≤

0.5.

6. The permanent magnet motor according to claim 1, wherein each phase winding has at least one coil group.

7. The permanent magnet motor according to claim 1, wherein:

the current for the second group of connectors of the A-phase winding and the current for the first group of connectors of the B-phase winding have the same phase at the same time;

the current for the second group of connectors of the B-phase winding and the current for the first group of connectors of the C-phase winding have the same phase at the same time; and

the current for the second group of connectors of the C-phase winding and the current for the first group of the A-phase winding have the same phase at the same time.

8. A compressor comprising a permanent magnet motor according to claim 1.

9. A refrigeration system comprising:

a compressor according to claim 8; and

a frequency converter connected to the compressor and comprising an inverter.

10. The refrigeration system according to claim 9, wherein the frequency converter further comprises a rectifier.