GB2574279A - Permanent magnet conical motors, stators and rotors thereof - Google Patents

Permanent magnet conical motors, stators and rotors thereof Download PDF

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Publication number
GB2574279A
GB2574279A GB1811943.8A GB201811943A GB2574279A GB 2574279 A GB2574279 A GB 2574279A GB 201811943 A GB201811943 A GB 201811943A GB 2574279 A GB2574279 A GB 2574279A
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GB
United Kingdom
Prior art keywords
rotor
permanent magnet
stator
cone angle
conical motor
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Granted
Application number
GB1811943.8A
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GB2574279B (en
GB201811943D0 (en
Inventor
Galea Michael
Roggia Sara
Cupertino Francesco
Zhang He
Gerada Christopher
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University of Nottingham Ningbo China
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University of Nottingham Ningbo China
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/02—Details
    • H02K21/021—Means for mechanical adjustment of the excitation flux
    • H02K21/022—Means for mechanical adjustment of the excitation flux by modifying the relative position between field and armature, e.g. between rotor and stator
    • H02K21/025—Means for mechanical adjustment of the excitation flux by modifying the relative position between field and armature, e.g. between rotor and stator by varying the thickness of the air gap between field and armature
    • H02K21/027—Conical air gap machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/06—Machines characterised by the presence of fail safe, back up, redundant or other similar emergency arrangements

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

A permanent magnet conical motor comprises a stator whose inner surface has a cone shape and a rotor having a truncated cone shape where a cone angle of the rotor is the same as a cone angle of the stator. The rotor may have a permanent magnet and rotate axially with respect to the stator. A spring mounted on a shaft of the rotor may negate an axial force produced by the magnet when the motor is not energized. The spring elasticity coefficient may be based on the axial force produced by the magnet when the motor is at no load. The cone angle may be calculated based on torque demand and an axial force required for an axial movement. When energized, a force acting on the rotor has a normal component and a tangential component with respect to a rotor lateral surface, and the tangential component may be proportional to rotor torque and a shear stress produced on the surface. The rotor axial force may be determined according to magnet characteristics at no load, and the magnet characteristics are based on the torque demand.

Description

PERMANENT MAGNET CONICAL MOTORS, STATORS AND ROTORS THEREOF
Background of the Invention
1. Field of the Invention
The present invention relates to a new topology of electrical machines, and more particularly to a permanent magnet conical motor, a stator, and a rotor thereof.
2. Description of the Prior Art
A normal torque is used to produce a rotational movement, and a rotor of a motor will also be able to perform an axial movement. This is ideal for applications where active engagement/disengagement is required, for example, like traction applications in aircraft and automotive.
Conical electrical machines exist and are in production. However, all available conical electrical machines today are from the induction electrical machine family. This is due to the fact that when the electrical machines are not energized through the power terminals, the induction electrical machines do not have a residual excitation. Therefore, there is no resident attraction between the stator and the rotor when the electrical machine is “off”. This is highly important for conical electrical machines as an existing attraction will result in an axial movement of the rotor. However, the main challenge for the induction electrical machines is their inherent low values of power density and torque density.
Today for mobile applications, the most popular electrical machine technology is that which use permanent magnets. This is due to the capability of permanent magnet electrical machines to achieve much higher torque density and power density and much better efficiency. However, when considering permanent magnet technology for a conical motor application, there are significant challenges to be overcome, mainly due to the permanent excitation nature of the electrical machines (resulted from the permanent magnets). For this reason, there is no permanent magnet electrical machine that has a conical nature today. Thus, no one has yet achieved the combined advantages of permanent magnet motors (high power density and high efficiency) and a conical geometry (axial movement) nowadays.
Hence, how to design a permanent magnet conical motor has become an important topic for the person skilled in the art.
Summary of the Invention i
It is one objective of the present invention to provide a permanent magnet conical motor, a stator and a rotor, so as to overcome at least one existing technical problem in the prior art.
According to one exemplary embodiment of the present invention, a permanent magnet conical motor is provided. The permanent magnet conical motor includes a stator, a rotor, and a spring. An inner surface of the stator has a cone shape. The rotor rotates axially with respect to the stator, an outer surface of the rotor has a truncated cone shape, a cone angle of the rotor is the same as a cone angle of the stator, and a permanent magnet is disposed on the rotor. The spring is mounted on a shaft of the rotor. When the permanent magnet conical motor is not energized, an axial force produced by the permanent magnet is negated by the spring.
In one example, an elasticity coefficient of the spring is determined based on the axial force produced by the permanent magnet when the permanent magnet conical motor is at no load.
In one example, the cone angle is calculated based on a torque demand of the permanent magnet conical motor and an axial force required for an axial movement.
In one example, when the permanent magnet conical motor is energized, a force acting on the rotor has a normal component and a tangential component with respect to a lateral surface of the rotor, and the tangential component is proportional to a torque of the rotor and a shear stress produced on the lateral surface of the rotor.
In one example, the axial force of the rotor is determined according to magnet characteristics of the permanent magnet when the permanent magnet conical motor is at no load, and the magnet characteristics of the permanent magnet is chosen based on the torque demand of the permanent magnet conical motor.
According to one exemplary embodiment of the present invention, a stator for use by a permanent magnet conical motor is provided. An inner surface of the stator has a cone shape, and a cone angle of the stator is the same as a cone angle of a rotor, wherein an outer surface of the rotor has a truncated cone shape, and the stator is matched with the rotor.
According to one exemplary embodiment of the present invention, a rotor for use by a permanent magnet conical motor is provided. An outer surface of the rotor has a truncated cone shape, and a cone angle of the rotor is the same as a cone angle of a stator, wherein an inner surface of the stator has a cone shape, and the rotor is matched with the stator. A permanent magnet is disposed on the rotor. A spring is mounted on the shaft of the rotor. When the permanent magnet conical motor is not energized, the axial force produced by the permanent magnet is negated by the spring.
In one example, an elasticity coefficient of the spring is determined based on the axial force produced by the permanent magnet when the permanent magnet conical motor is at no load.
In one example, the cone angle is calculated based on a torque demand of the permanent magnet conical motor and an axial force required for an axial movement.
In one example, when the permanent magnet conical motor is energized, a force acting on the rotor has a normal component and a tangential component with respect to a lateral surface of the rotor, and the tangential component is proportional to a torque of the rotor and a shear stress produced on the lateral surface of the rotor.
In one example, the axial force of the rotor is determined according to magnet characteristics of the permanent magnet when the permanent magnet conical motor is at no load, and the magnet characteristics of the permanent magnet is chosen based on the torque demand of the permanent magnet conical motor.
The present invention has the following beneficial effects:
The permanent magnet motor and the conical geometry are combined in the present invention, such that the permanent magnet conical motor has a higher torque, a higher power density and a higher efficiency. When the permanent magnet conical motor is deenergized, the resident attraction between the stator and the rotor is eliminated by means of the spring mounted on the shaft of the rotor, which avoids axial movement of the rotor, thereby achieving the advantages of both the permanent magnet motor and the conical motor.
These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.
Brief Description of the Drawings
FIG. 1a is a cross-section diagram of a permanent magnet conical motor according to one embodiment of the present invention.
FIG. 1b is a schematic diagram of each vector when the motor target torque is reduced byq according to one embodiment of the present invention.
FIG. 2 is a schematic diagram showing the decomposition of the force acting on the rotor of the permanent magnet conical motor.
FIG. 3 is a structural diagram of a rotor according to one embodiment of the present invention.
FIG. 4a is a torque measurement graph when the rotational speed is 50 rpm according to one embodiment of the present invention.
FIG. 4b is a torque measurement graph when the rotational speed is 500 rpm according to one embodiment of the present invention.
FIG. 5 is a schematic diagram showing the axial force according to one embodiment of the present invention.
Detailed Description
Certain terms are used throughout the following descriptions and claims to refer to particular system components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This document does not intend to distinguish between components that differ in name but not differ in functionality. In the following discussion and in the claims, the terms “include”, “including”, “comprise”, and “comprising” are used in an open-ended fashion, and thus should be interpreted to mean “including, but not limited to ...” The terms “couple” and “coupled” are intended to mean either an indirect or a direct electrical connection. Thus, if a first device couples to a second device, that connection may be through a direct electrical connection, or through an indirect electrical connection via other devices and connections.
The figures are only illustrations of an example, wherein the units or procedure shown in the figures are not necessarily essential for implementing the present invention. Those skilled in the art will understand that the units in the device in the example can be arranged in the device in the examples as described, or can be alternatively located in one or more devices different from that in the examples. The units in the examples described can be combined into one module or further divided into a plurality of sub-units.
Embodiment 1
Please refer to FIG. 1a. FIG. 1a is a cross-section diagram of a permanent magnet conical motor according to one embodiment of the present invention. As shown in FIG. 1a, a permanent magnet conical motor includes, but not limited to, a stator, a rotor, and a spring. An inner surface of the stator has a cone shape. The rotor rotates axially with respect to the stator, an outer surface of the rotor has a truncated cone shape, a cone angle of the rotor is the same as a cone angle of the stator, and a permanent magnet is disposed on the rotor. The spring is mounted on a shaft of the rotor. When the permanent magnet conical motor is not energized, an axial force produced by the permanent magnet is negated by the spring.
In a specific implementation, an elasticity coefficient of the spring is determined based on the axial force produced by the permanent magnet when the permanent magnet conical motor is at no load, thereby farther counteracting the axial force produced by the permanent magnet.
The cone angle is the main parameter that influences the performance of the conical motor during the optimization process of the conical motor design. In a specific implementation, the cone angle is calculated based on a torque demand of the permanent magnet conical motor and an axial force required for an axial movement. For example, assuming that an optimum design of the permanent magnet conical motor has been designed, the cone angley may be selected to limit the torque reduction resulted from the cone shape of the rotor to a fixed valuer). The maximum torque minusq is set to a preferred value that allows satisfaction of application requirement, wherein the cone angley can be selected from the equation (2). The equation (2) is an expression of the cone angle γ defined by a function of the length and the radius of the permanent magnet conical motor. The equation (1) corresponds the conical torque to the cylindrical torque. If the equation (1) is further derived, the equation (2) is obtained when the cone angley explicitly expresses a variable determined by reducing η from the target torque.
—2 r i αχ ,γ ax
100 (1).
ax
COS/ ' ζ?2 η ax t 10Q (2).
Herein, lax represents an axial extension distance of an isosceles triangle formed by extending the axis; lax,Y represents the sum of the rotor axis distance and lax; γ represents the cone angle; rmax represents the radius of a larger bottom surface of the rotor; R, and rmax in the above formula represent the same physical quantity; rmin represents the radius of the smaller bottom surface of the rotor; R, is the variable to be solved between rmax and rmin; LFe represents the axial length of the rotor; and l_Fe,Y represents the length of a lateral surface of the rotor.
Furthermore, the size of the permanent magnet conical motor can be modified to meet application requirements.
Please refer to FIG. 2. FIG. 2 is a schematic diagram showing the decomposition of the force acting on the rotor of the permanent magnet conical motor. As shown in FIG. 2, Si is the larger bottom surface of the rotor, S2 is the later surface of the rotor, and S3 is the smaller bottom surface of the rotor. In a specific implementation, when the permanent magnet conical motor is energized, the force Fn acting on the rotor has a normal component Fr and a tangential component Fz with respect to the lateral surface S2 of the rotor, and the tangential component Fz is proportional to a torque of the rotor and a shear stress produced on the lateral surface of the rotor. The normal component Fr, if evaluated in a cylindrical coordinate system, has radial and axial contributions, as shown in FIG. 2. Radial forces around the rotor surface are usually negligible as the resulting vector sum of radial stresses over the circumference of the rotor approaches zero. Due to the inherent attraction between the rotor and the stator, the axial component of the force is controlled to push or pull the rotor in the horizontal direction.
In a specific implementation, the axial force of the rotor is determined according to magnet characteristics of the permanent magnet when the permanent magnet conical motor is at no load, and the magnet characteristics of the permanent magnet is chosen based on the torque demand of the permanent magnet conical motor.
Embodiment 2
In this embodiment, a stator for use by a permanent magnet conical motor is provided. An inner surface of the stator has a cone shape, and a permanent magnet is disposed on the inner surface of the stator. A cone angle of the stator is the same as a cone angle of a rotor, wherein an outer surface of the rotor has a truncated cone shape, and the stator is matched with the rotor. In a specific implementation, the calculation method of the cone angle in Embodiment 2 is the same as the calculation method of the cone angle in Embodiment 1.
Embodiment 3
In this embodiment, a rotor for use by a permanent magnet conical motor is provided, as shown in FIG. 3. An outer surface of the rotor has a truncated cone shape, and a cone angle of the rotor is the same as a cone angle of a stator, wherein an inner surface of the stator has a cone shape, and the rotor is matched with the stator. A permanent magnet is disposed on the rotor. A spring is mounted on the shaft of the rotor. When the permanent magnet conical motor is not energized, the axial force produced by the permanent magnet is negated by the spring.
In one example, an elasticity coefficient of the spring is determined based on the axial force produced by the permanent magnet when the permanent magnet conical motor is at no load.
In one example, the cone angle is calculated based on a torque demand of the permanent magnet conical motor and an axial force required for an axial movement.
In one example, when the permanent magnet conical motor is energized, a force acting on the rotor has a normal component and a tangential component with respect to a lateral surface of the rotor, and the tangential component is proportional to a torque of the rotor and a shear stress produced on the lateral surface of the rotor.
The cone angle has an important influence on the torque performance, and the cone angle must be calculated in accordance with torque demand and the axial force required for an axial movement.
In order to prove and validate the present invention, a demonstrator has been designed, developed, and tested. FIG.4 (including FIG. 4a and FIG. 4b) and FIG. 5 show the experimental results that validate the operation of the permanent magnet conical motor of the present invention. FIG. 4a is a torque measurement graph when the rotational speed is 50 rpm according to one embodiment of the present invention. FIG. 4b is a torque measurement graph when the rotational speed is 500 rpm according to one embodiment of the present invention. FIG. 5 is a schematic diagram showing the axial force according to one embodiment of the present invention.
Reference in the specification to one example or an example means that a particular feature, structure, or characteristic described in connection with the example is included in at least an implementation. The appearances of the phrase in one example in various places in the specification are not necessarily all referring to the same example. Thus, although examples have been described in language specific to structural features and/or methodological acts, it is to be understood that claimed subject matter may not be limited to the specific features or acts described. Rather, the specific features and acts are disclosed as sample forms of implementing the claimed subject matter.
The above are only preferred examples of the present invention is not intended to limit the present invention within the spirit and principles of the present invention, any changes made, equivalent replacement, or improvement in the protection of the present invention should contain within the range.
Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.

Claims (18)

  1. What is claimed is:
    1. A permanent magnet conical motor, comprising:
    a stator, wherein an inner surface of the stator has a cone shape;
    a rotor, wherein the rotor rotates axially with respect to the stator, an outer surface of the rotor has a truncated cone shape, a cone angle of the rotor is the same as a cone angle of the stator, and a permanent magnet is disposed on the rotor; and a spring, wherein the spring is mounted on a shaft of the rotor;
    wherein when the permanent magnet conical motor is not energized, an axial force produced by the permanent magnet is negated by the spring.
  2. 2. The permanent magnet conical motor of claim 1, wherein an elasticity coefficient of the spring is determined based on the axial force produced by the permanent magnet when the permanent magnet conical motor is at no load.
  3. 3. The permanent magnet conical motor of claim 1, wherein the cone angle is calculated based on a torque demand of the permanent magnet conical motor and an axial force required for an axial movement.
  4. 4. The permanent magnet conical motor of claim 1, wherein the following equation (1) corresponds a conical torque to a cylindrical torque:
    αχ ,χ 1 ax i ι λλ
    1UU (1); werein, lax represents an axial extension distance of an isosceles triangle formed by extending the axis; lax,Y represents the sum of the rotor axis distance and lax; γ represents the cone angle; rmax represents the radius of a larger bottom surface of the rotor; R, and rmax in the above formula represent the same physical quantity; rmin represents the radius of the smaller bottom surface of the rotor; R, is the variable to be solved between rmax and rmin; LFe represents the axial length of the rotor; and l_Fe,Y represents the length of a lateral surface of the rotor.
  5. 5. The permanent magnet conical motor of claim 1, wherein the cone angle is selected based on the following equation (2):
    =CA2— cosy 100 (2);
    wherein lax represents an axial extension distance of an isosceles triangle formed by extending the axis; lax,y represents the sum of the rotor axis distance and lax; γ represents the cone angle; rmax represents the radius of a larger bottom surface of the rotor; Ri and rmax in the above formula represent the same physical quantity; rmin represents the radius of the smaller bottom surface of the rotor; Ri is the variable to be solved between rmax and rmin; LFe represents the axial length of the rotor; and LFe, γ represents the length of a lateral surface of the rotor.
  6. 6. The permanent magnet conical motor of claim 1, wherein when the permanent magnet conical motor is energized, a force acting on the rotor has a normal component and a tangential component with respect to a lateral surface of the rotor, and the tangential component is proportional to a torque of the rotor and a shear stress produced on the lateral surface of the rotor.
  7. 7. The permanent magnet conical motor of claim 1, wherein the axial force of the rotor is determined according to magnet characteristics of the permanent magnet when the permanent magnet conical motor is at no load, and the magnet characteristics of the permanent magnet is chosen based on the torque demand of the permanent magnet conical motor.
  8. 8. A stator for use by a permanent magnet conical motor, wherein an inner surface of the stator has a cone shape, a cone angle of the stator is the same as a cone angle of a rotor, an outer surface of the rotor has a truncated cone shape, and the stator is matched with the rotor.
  9. 9. The stator of claim 8, wherein the cone angle is calculated based on a torque demand of the permanent magnet conical motor and an axial force required for an axial movement.
  10. 10. The stator of claim 8, wherein the following equation (1) corresponds a conical torque to a cylindrical torque:
    —2 ? 77 ,, r > = loxR —1—
    CIX , γ UX l 1 A A
    1UU (1); werein, lax represents an axial extension distance of an isosceles triangle formed by extending the axis; lax,Y represents the sum of the rotor axis distance and lax; γ represents the cone angle; rmax represents the radius of a larger bottom surface of the rotor; R, and rmax in the above formula represent the same physical quantity; rmin represents the radius of the smaller bottom surface of the rotor; R, is the variable to be solved between rmax and rmin; LFe represents the axial length of the rotor; and l_Fe,Y represents the length of a lateral surface of the rotor.
  11. 11. The stator of claim 8, wherein the cone angle is selected based on the following equation (2):
    =— cos/ 100 (2);
    wherein lax represents an axial extension distance of an isosceles triangle formed by extending the axis; lax,y represents the sum of the rotor axis distance and lax; γ represents the cone angle; rmax represents the radius of a larger bottom surface of the rotor; Ri and rmax in the above formula represent the same physical quantity; rmin represents the radius of the smaller bottom surface of the rotor; Ri is the variable to be solved between rmax and rmin; LFe represents the axial length of the rotor; and LFe, γ represents the length of a lateral surface of the rotor.
  12. 12. A rotor for use by a permanent magnet conical motor, wherein an outer surface of the rotor has a truncated cone shape, a cone angle of the rotor is the same as a cone angle of a stator, an inner surface of the stator has a cone shape, and the rotor is matched with the stator; wherein a permanent magnet is disposed on the rotor; wherein a spring is mounted is mounted on a shaft of the rotor; and wherein when the permanent magnet conical motor is not energized, an axial force produced by the permanent magnet is negated by the spring.
  13. 13. The rotor of claim 12, wherein an elasticity coefficient of the spring is determined based on the axial force produced by the permanent magnet when the permanent magnet conical motor is at no load.
  14. 14. The rotor of claim 12, wherein the cone angle is calculated based on a torque demand of the permanent magnet conical motor and an axial force required for an axial movement.
  15. 15. The stator of claim 12, wherein the following equation (1) corresponds a conical torque to a cylindrical torque:
    iax 7 / = CR, —
    1UU (1); werein, lax represents an axial extension distance of an isosceles triangle formed by extending the axis; lax,Y represents the sum of the rotor axis distance and lax; γ represents the cone angle; rmax represents the radius of a larger bottom surface of the rotor; R, and rmax in the above formula represent the same physical quantity; rmin represents the radius of the smaller bottom surface of the rotor; R, is the variable to be solved between rmax and rmin; LFe represents the axial length of the rotor; and l_Fe,Y represents the length of a lateral surface of the rotor.
  16. 16. The stator of claim 12, wherein the cone angle is selected based on the following equation (2):
    =LK— cos/ 100 (2);
    wherein lax represents an axial extension distance of an isosceles triangle formed by extending the axis; lax,y represents the sum of the rotor axis distance and lax; γ represents the cone angle; rmax represents the radius of a larger bottom surface of the rotor; Ri and rmax in the above formula represent the same physical quantity; rmin represents the radius of the smaller bottom surface of the rotor; Ri is the variable to be solved between rmax and rmin; LFe represents the axial length of the rotor; and LFe, γ represents the length of a lateral surface of the rotor.
  17. 17. The rotor of claim 12, wherein when the permanent magnet conical motor is energized, a force acting on the rotor has a normal component and a tangential component with respect to a lateral surface of the rotor, and the tangential component is proportional to a torque of the rotor and a shear stress produced on the lateral surface of the rotor.
  18. 18. The rotor of claim 12, wherein the axial force of the rotor is determined according to magnet characteristics of the permanent magnet when the permanent magnet conical motor is at no load, and the magnet characteristics of the permanent magnet is chosen based on the torque demand of the permanent magnet conical motor.
GB1811943.8A 2018-05-30 2018-07-23 Permanent magnet conical motors, stators and rotors thereof Active GB2574279B (en)

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CN201810540233.9A CN108667164A (en) 2018-05-30 2018-05-30 Permanent magnetism Cone-shaped electric machine and stator, rotor

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CN112910170A (en) * 2021-03-25 2021-06-04 广州小鹏汽车科技有限公司 Motor, motor control method, vehicle and medium

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US20150171721A1 (en) * 2013-12-18 2015-06-18 Hyundai Motor Company Air gap variable motor
CN206559208U (en) * 2017-03-15 2017-10-13 江苏俊云机械科技有限公司 Double-stator conical permanent-magnet synchronous hub motor structure

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Publication number Priority date Publication date Assignee Title
GB733975A (en) * 1952-10-01 1955-07-20 Bendix Aviat Corp Improvements in or relating to alternators
EP0304974A1 (en) * 1987-08-10 1989-03-01 Karel Holden Alternator
JPH0880019A (en) * 1994-09-08 1996-03-22 Matsushita Electric Ind Co Ltd Motor
US6455975B1 (en) * 1999-12-03 2002-09-24 Pacific Scientific Electro Kinetics Division Regulated permanent magnet generator
CN101604891A (en) * 2009-07-20 2009-12-16 哈尔滨工业大学 Double-stator conical adjustable air gap permanent magnet motor
US20150171721A1 (en) * 2013-12-18 2015-06-18 Hyundai Motor Company Air gap variable motor
CN206559208U (en) * 2017-03-15 2017-10-13 江苏俊云机械科技有限公司 Double-stator conical permanent-magnet synchronous hub motor structure

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GB201811943D0 (en) 2018-09-05
CN108667164A (en) 2018-10-16

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