Fault-tolerant modular permanent magnet assisted synchronous reluctance motor and modular winding design method

Patent metadata

Field	Value
Publication number	US-11522400-B2
Application number	US-201916487021-A
Country	US
Kind code	B2
Filing date	Jan 4, 2019
Priority date	Apr 27, 2018
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

The present invention relates to a fault-tolerant modular permanent magnet assisted synchronous reluctance motor (PMaSynRM) and provides a modular winding connection method. The modular winding connection is to change the positions of inlet and outlet coils based on the slot electrical potential star vectogram. Then, each module has a separate set of winding and the left and right relative distribution will be adopted on the winding connection. The invention has the advantages of modularization in structure, high independence between the modules, effectively avoiding overlapping of magnetic lines between the modules, and improving fault tolerance and reliability of the motor. The invention has the advantages of modularization in structure, high independence between the modules, magnetic decoupling between the modules, and improvement of fault tolerance and reliability of the motor.

First claim

The invention claimed is:

1. A fault-tolerant modular permanent magnet assisted synchronous reluctance motor (PMaSynRM) comprising a modular stator and an asymmetric rotor, wherein
the modular stator includes a stator iron core, armature windings, non-magnetic conductors, and a plurality of teeth and slots in the circumferential direction,
wherein the modular stator comprises at least one module, each of the at least one module formed between two circumferentially adjacent non-magnetic conductor distributed along the circumference;
the slots closest to both sides of the non-magnetic conductor are shifting circumferentially away from the non-magnetic conductor;
the rotor includes rotor iron core, flux barriers and permanent magnets;
the flux barrier angles are different in each pole and the flux barrier angles of adjacent poles are also different; and
the permanent magnets are inserted in the flux barriers and the N poles and the S poles of the permanent magnets adjacent in the circumferential direction are alternately arranged; and wherein slots a slots b are configured as closest to both sides of the non-magnetic conductor, and comprise different shifting angles, and wherein the remaining slots have the same slot spacing.

2. The fault-tolerant module PMaSynRM of claim 1 , wherein each modular is connected by a separate three-phase distributed winding, wherein said three-phase distributed winding comprises a single layer or a double layer.

3. The fault-tolerant module PMaSynRM of claim 1 , wherein the clockwise flux barrier angles along the reference module are

β
+
θ

,

β
+

2
⁢
θ
⁢

⁢
…
⁢

⁢
β

+

n
-
1

2

⁢
θ

,

the counterclockwise flux barrier angles along with the reference module:

β
+
θ

,

β
+

2
⁢
θ
⁢

⁢
…
⁢

⁢
β

-

n
-
1

2

⁢
θ

,

p=n, when the number of rotor poles pair p is an odd number and the flux barrier angle β of any modular is selected as the reference, and wherein the clockwise flux barrier angles along the reference module are

β
+
θ

,

β
+

2
⁢
θ
⁢

⁢
…
⁢

⁢
β

+

(

n
2

-
1

)

⁢
θ

,
β
,

β
-
θ

,

β
-

2
⁢
θ
⁢

⁢
…
⁢

⁢
β

-

(

n
2

-
1

)

⁢
θ

,

p=n, when the number of rotor poles pair p is an even number.

4. The fault-tolerant module PMaSynRM of claim 1 , wherein the shifting angles of slot a and slot b are θ 1 and θ 2 , and wherein the specific values of θ 1 and θ 2 are set to 2.2 degrees and 2 degrees, respectively.

5. A method for a modular winding design in the fault-tolerant modular PMaSynRM comprises the following steps:
Step 1: Providing the fault-tolerant modular PMaSynRM comprising a modular stator and an asymmetric rotor, wherein the modular stator includes a stator iron core, armature windings, non-magnetic conductors and a plurality of teeth and slots in the circumferential direction, and wherein
wherein the modular stator comprises at least one module, each of the at least one module formed between circumferentially adjacent non-magnetic conductor distributed along the circumference;
the slots closest to both sides of the non-magnetic conductor are shifting circumferentially away from the non-magnetic conductor;
the rotor includes rotor iron core, flux barriers and permanent magnets;
the flux barrier angles are different in each pole and the flux barrier angles of adjacent poles are also different; and
the permanent magnets are inserted in the flux barriers and the N poles and the S poles of the permanent magnets adjacent in the circumferential direction are alternately arranged;

Step 2: Selecting the appropriate number of modules according to the numbers of slots and poles of the PMaSynRM with distributed winding, wherein the number of stator slots contained in each module is greater than or equal to 2 m, m≥3;
Step 3: Splitting the windings based on the slot electrical potential star vectogram, wherein each module is guaranteed to have an independent set of windings and the set of windings only uses stator slots in the same module, and wherein in order not to change the winding factor of the motor, the winding pitch is the same as the conventional connection and the left and right relative distribution will be adopted on the winding connection; and
Step 4: Inserting

Assignees

• Univ Jiangsu

Inventors

• Liu Guohai
• Xu Meimei
• Zhao Wenxiang
• Ji Jinghua
• Chen Qian
• Ling Zhijian

Classifications

• H02K21/14 Primary

  with magnets rotating within the armatures · CPC title

• H02K16/04

  Machines with one rotor and two stators · CPC title

• H02K1/16

  Stator cores with slots for windings · CPC title

• H02K3/28 Primary

  Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) · CPC title

• H02K1/2766

  having a flux concentration effect · CPC title