Rotor for wound-rotor motor and wound-rotor motor having the same

Patent metadata

Field	Value
Publication number	US-10686342-B2
Application number	US-201715837937-A
Country	US
Kind code	B2
Filing date	Dec 11, 2017
Priority date	Dec 14, 2016
Publication date	Jun 16, 2020
Grant date	Jun 16, 2020

Abstract

Disclosed herein is a rotor for a wound-rotor motor. The rotor for a wound-rotor motor includes: a rotor core including a hollow formed in a central portion thereof and coupled to a shaft; a teeth portion radially formed on an outer side surface of the rotor; and a pole shoe formed to extend from an end portion of the teeth portion in one direction and including a part of a cross section of an outer side surface formed in an arc shape of a first imaginary circle (C 1 ) having a first radius (r 1 ) which is a distance from a central point (CP 1 ) of the hollow to an outermost position (P 1 ) thereof.

First claim

What is claimed is:

1. A rotor for a wound-rotor motor, comprising:
a rotor core including a hollow defined in a central portion thereof and coupled to a shaft;
a teeth portion radially disposed on an outer side surface of the rotor; and
a pole shoe extending from an end portion of the teeth portion in one direction and including a part of a cross section of an outer side surface having an arc shape of a first imaginary circle (C 1 ) having a first radius (r 1 ) which is a distance from a central point (CP 1 ) of the hollow to an outermost position (P 1 ) thereof,
wherein the teeth portion and the pole shoe includes n teeth portions and n pole shoes,
wherein the n teeth portions are disposed on an outer circumferential surface of the rotor core in a circumferential direction to be spaced 360/n degrees from each other,
winding regions in which coils are wound are defined between the n teeth portions,
when an outer side surface of each of then pole shoes extends from one end position to the other end position of the pole shoe at a first rotation angle in a direction in which the rotor rotates, the first rotation angle ranges from 18° to 45°,
wherein a part of a cross section of the outer side surface of the pole shoe has an arc shape of a second imaginary circle (C 2 ) having a second central point (CP 2 ) and a second radius (r 2 ),
wherein the second imaginary circle is internally tangent to the first imaginary circle at a first intersection point,
wherein the second central point (CP 2 ) is spaced apart from a central point (CP 1 ) of the first imaginary circle by a difference between the first radius and the second radius,
wherein at least of a part of a cross section of the outer side surface of the pole shoe has an arc shape of a third imaginary circle (C 3 ) having a third central point (CP 3 ) and a third radius (r 3 ),
wherein the third imaginary circle is externally tangent to the second imaginary circle at a second intersection point, and
wherein the third radius (r 3 ) ranges from 110% of the first radius (r 1 ) to 125% of the first radius r 1 .

2. The rotor for a wound-rotor motor of claim 1 , wherein the second radius (r 2 ) ranges from 60% of the first radius (r 1 ) to 80% of the first radius (r 1 ).

3. The rotor for a wound-rotor motor of claim 1 , wherein the second radius (r 2 ) ranges from 50% of the first radius (r 1 ) to 70% of the first radius (r 1 ).

4. The rotor for a wound-rotor motor of claim 1 , wherein each of the first rotation angle, a second rotation angle, and a third rotation angle is an angle at which a first imaginary line, which passes the one end position of the pole shoe and the central point (CP 1 ), is inclined in a rotational direction of the rotor.

5. The rotor for a wound-rotor motor of claim 4 , wherein the second central point is positioned on a second imaginary line spaced the second rotation angle from the first imaginary line in the rotational direction of the rotor and configured to extend from the first central point.

6. The rotor for a wound-rotor motor of claim 5 , wherein the third central point is positioned on a third imaginary line spaced the third rotation angle from the first imaginary line in the rotational direction of the rotor and configured to extend from the first central point.

7. The rotor for a wound-rotor motor of claim 4 , wherein the second rotation angle ranges from 10% of the first rotation angle (θ 1 ) to 20% of the first rotation angle (θ 1 ).

8. The rotor for a wound-rotor motor of claim 4 , wherein the second rotation angle ranges from 40% of the first rotation angle (θ 1 ) to 50% of the first rotation angle (θ 1 ).

9. The rotor for a wound-rotor motor of claim 4 , wherein the third rotation angle ranges from 80% of the first rotation angle (θ 1 ) to 90% of the first rotation angle (θ 1 ).

10. The rotor for a wound-rotor motor of claim 4 , wherein the third rotation angle ranges from 60% of the first rotation angle (θ 1 ) to 70% of the first rotation angle (θ 1 ).

11. The rotor for a wound-rotor motor of claim 6 , wherein a cross section from the one end position of the pole shoe to the first intersection point (m 1 ) of the outer side surface of the pole shoe has the arc shape of the first imaginary circle (C 1 ),
wherein a cross section from the first intersection point (m 1 ) to the second intersection point (m 2 ) has the arc shape of the second imaginary circle (C 2 ), and
wherein a cross section from the second intersection point (m 2 ) to the other end position of the pole shoe has the arc shape of the third imaginary circle (C 3 ).

12. The rotor for a wound-rotor motor of claim 6 , wherein a cross section from the one end position of the pole shoe to an outermost position of the pole shoe has the arc shape of the first imaginary circle (C 1 ),
wherein a cross section from the outermost position of the pole shoe to the second intersection point (m 2 ) has the arc shape of the second imaginary circle (C 2 ), and
wherein a cross section from the second intersection point (m 2 ) to the other end position of the pole shoe has the arc shape of the third imaginary circle (C 3 ).

13. A wound-rotor motor comprising:
the rotor of claim 1 ; and
a stator configured to cover an outer circumferential surface of the rotor and disposed to be spaced apart from the outer circumferential surface of the rotor.

14. A rotor for a wound-rotor motor, comprising:
a rotor core including a hollow defined in a central portion thereof and coupled to a shaft;
a teeth portion radially disposed on an outer side surface of the rotor; and
a pole shoe extending from an end portion of the teeth portion in one direction and including a part of a cross section of an outer side surface having an arc shape of a first imaginary circle (C 1 ) having a first radius (r 1 ) which is a distance from a central point (CP 1 ) of the hollow to an outermost position (P 1 ) thereof,
wherein the teeth portion and the pole shoe includes n teeth portions and n pole shoes,
wherein the n teeth portions are disposed on an outer circumferential surface of the rotor core in a circumferential direction to be spaced 360/n degrees from each other,
winding regions in which coils are wound are defined between the n teeth portions,
when an outer side surface of each of then pole shoes extends from one end position, to the other end position of the pole shoe at a first rotation angle in a direction in which the rotor rotates, the first rotation angle ranges from 18° to 45°,
wherein a part of a cross section of the outer side surface of the pole shoe has an arc shape of a second imaginary circle (C 2 ) having a second central point (CP 2 ) and a second radius (r 2 ),
wherein the second imaginary circle is internally tangent to the first imaginary circle at a first intersection point,
wherein the second central point (CP 2 ) is spaced apart from a central point (CP 1 ) of the first imaginary circle by a difference between the first radius and the second radius,
wherein at least a part of a cross section of the outer side surface of the pole shoe has an arc shape of a third imaginary circle (C 3 ) having a third central point (CP 3 ) and a third radius (r 3 );
wherein the third imaginary circle is internally tangent to the second imaginary circle at a second intersection point, and
wherein the third radius (r 3 ) ranges from 10% of the first radius (r 1 ) to 30% of the first radius (r 1 ).

15. The rotor for a wound-rotor motor of claim 14 , wherein each of the first rotation angle, a second rotation angle, and a third rotation angle is an angle at which a first imagin

Assignees

• Mando Corp

Inventors

• Park Seung Young

Classifications

• H02K1/24 Primary

  Rotor cores with salient poles {; Variable reluctance rotors} · CPC title

• H02K1/22 Primary

  Rotating parts of the magnetic circuit · CPC title

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title

• H02P6/08

  Arrangements for controlling the speed or torque of a single motor (H02P6/10, H02P6/28 take precedence) · CPC title

• H02K1/243

  of the claw-pole type · CPC title