Direct starting synchronous reluctance motor rotor, motor and rotor manufacturing method

Patent metadata

Field	Value
Publication number	US-11824409-B2
Application number	US-201917604126-A
Country	US
Kind code	B2
Filing date	Dec 27, 2019
Priority date	Jun 19, 2019
Publication date	Nov 21, 2023
Grant date	Nov 21, 2023

Abstract

The present disclosure provides a direct starting synchronous reluctance motor rotor, a motor and a rotor manufacturing method. The direct starting synchronous reluctance motor rotor comprises: a rotor core provided with a plurality of slit grooves, two ends of each of the slit grooves being provided with a filling groove respectively to form a magnetic barrier layer, a first end of the filling groove being disposed adjacent to the slit groove, a second end of the filling groove being extended towards an outside of the rotor core, and an outer peripheral surface of the rotor core being provided with a notch communicated with the second end of the filling groove. By disposing notches and bevels at the end of the filling grooves, a reluctance torque of the motor can be increased, and then torque ripples generated by rotor and stator slots can be weakened mutually, thereby achieving the purpose of reducing the torque ripple of the motor and vibration noise of the motor, while improving an efficiency of the motor with the rotor and a starting capability of the motor.

First claim

The invention claimed is:

1. A direct starting synchronous reluctance motor rotor, comprising:
a rotor core provided with a plurality of slit grooves; and
two filling grooves respectively disposed adjacent to two ends of each of the slit grooves to form a magnetic barrier layer,
wherein a first end of a filling groove being disposed adjacent to a slit groove, a second end of the filling groove being extended towards an outside of the rotor core, and an outer peripheral surface of the rotor core being provided with a notch communicated with the second end of the filling groove, and
wherein a width of the notch is L, which is less than a width of the second end of the filling groove, and 0.5σ≤L≤4σ, wherein σ is an air gap width between a stator core and the rotor core.

2. The direct starting synchronous reluctance motor rotor according to claim 1 , wherein the notch is disposed at the second end of the filling groove adjacent to a d-axis.

3. The direct starting synchronous reluctance motor rotor according to claim 1 , wherein the width of the notch satisfies 1.5σ≤L≤3σ.

4. The direct starting synchronous reluctance motor rotor according to claim 1 , wherein a beveled edge is disposed on the second end of the filling groove away from a d-axis of the rotor core beveled edge, and one end of the beveled edge adjacent to the peripheral surface of the rotor core ( 10 ) is extended to the notch.

5. The direct starting synchronous reluctance motor rotor according to claim 1 , wherein 0.1W≤L≤0.7W, wherein W is a width of the second end of the filling groove.

6. The direct starting synchronous reluctance motor rotor according to claim 4 , wherein an included angle θ is between the beveled edge and a sidewall of the filling groove away from the side in the d-axis, wherein 125°≤θ≤165°.

7. The direct starting synchronous reluctance motor rotor according to claim 1 , wherein an extending direction of the filling groove is parallel with or at an included angle with a d-axis of the rotor core, and lengths of the filling grooves are gradually increased towards a d-axis of the rotor core.

8. The direct starting synchronous reluctance motor rotor according to claim 1 , wherein the slit groove and the filling groove have shapes of rectangles, circular arcs, or combinations of multiple shapes.

9. The direct starting synchronous reluctance motor rotor according to claim 1 , wherein there is an interval between the filling groove in a q-axis of the rotor core and an outer peripheral surface of the rotor core.

10. The direct starting synchronous reluctance motor rotor according to claim 1 , wherein at different poles of the rotor core, the adjacent slit grooves are symmetrically disposed along a d-axis of the rotor core on a rotor circumference, and the filling grooves are disposed symmetrically along the d-axis or a q-axis, and there are at least two of the magnetic barrier layers formed by the slit groove and the filling grooves at both ends thereof in a radial direction of the rotor core.

11. The direct starting synchronous reluctance motor rotor according to claim 10 , wherein a reinforcing rib is disposed between the filling groove and the slit groove in a same magnetic barrier layer, and a width of the reinforcing rib is L 1 , wherein 0.8σ≤L 1 ≤3σ.

12. The direct starting synchronous reluctance motor rotor according to claim 1 , wherein a ratio of a sum of a total width of all of the slit grooves in a q-axis and a width of the filling groove in the q-axis to an effective core width in a radial direction of the rotor core is Q 1 , wherein 0.35≤Q 1 ≤0.5.

13. The direct starting synchronous reluctance motor rotor according to claim 1 , wherein a part of the slit grooves and a part of the filling grooves are filled with a conductive magnetic-insulation material, or all of the filling grooves are filled with the conductive magnetic-insulation material, and a ratio of a filling area of the conductive magnetic-insulation material to a total area of all of the filling grooves and the slit grooves is Q 2 , wherein 0.3≤Q 2 ≤0.7.

14. The direct starting synchronous reluctance motor rotor according to claim 1 , wherein two conductive end ring are disposed on two ends of the rotor core to communicate filling materials in all of the two filling grooves, such that a squirrel cage is formed, and a material of the conductive end ring is the same as that in the filling groove.

15. The direct starting synchronous reluctance motor rotor according to claim 1 , wherein at least a part of the slit grooves are air grooves penetrating in an axial direction of a rotor.

16. The direct starting synchronous reluctance motor rotor according to claim 1 , wherein widths of the slit grooves are gradually decreased outward in a radial direction of the rotor core.

17. The direct starting synchronous reluctance motor rotor according to claim 1 , wherein widths of a magnetic conduction channels formed between adjacent two of the slit grooves are gradually decreased outward in a radial direction of the rotor core.

18. A motor, comprising the direct starting synchronous reluctance motor rotor according to claim 1 .

19. A rotor manufacturing method to manufacture the direct starting synchronous reluctance motor rotor according to claim 1 , the method comprising:
producing a rotor core, and disposing closed filling grooves on the rotor core, so that the filling grooves have temporary ribs adjacent to an peripheral surface of the rotor core;
filling a material into the filling grooves, and disposing conductive end rings at ends of the rotor core to form a squirrel cage; and
removing the temporary ribs by turning to form notches of the filling grooves.

Assignees

• Gree Electric Appliances Inc Zhuhai

Inventors

• Hu Yusheng
• Chen Bin
• Shi Jinfei
• Xiao Yong
• Li Xia
• Yu Qinhong

Classifications

• H02K15/023

  Cage rotors · CPC title

• H02K19/14 Primary

  having additional short-circuited windings for starting as asynchronous motors · CPC title

• H02K15/0012

  Electricity · mapped topic

• H02K1/22 Primary

  Rotating parts of the magnetic circuit · CPC title

• H02K1/246 Primary

  Variable reluctance rotors · CPC title