CN112260424A - Induction type rotor and switched reluctance motor - Google Patents

Induction type rotor and switched reluctance motor Download PDF

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Publication number
CN112260424A
CN112260424A CN202011167173.4A CN202011167173A CN112260424A CN 112260424 A CN112260424 A CN 112260424A CN 202011167173 A CN202011167173 A CN 202011167173A CN 112260424 A CN112260424 A CN 112260424A
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CN
China
Prior art keywords
pole
rotor
wings
salient
switched reluctance
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Pending
Application number
CN202011167173.4A
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Chinese (zh)
Inventor
顾志强
李运忠
刘正昂
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Shenzhen Huayin Power Technology Co ltd
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Shenzhen Huayin Power Technology Co ltd
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Priority to CN202011167173.4A priority Critical patent/CN112260424A/en
Publication of CN112260424A publication Critical patent/CN112260424A/en
Pending legal-status Critical Current

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    • 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
    • H02K1/14—Stator cores with salient poles
    • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
    • 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
    • H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
    • 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
    • H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
    • H02K1/246—Variable reluctance rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Synchronous Machinery (AREA)

Abstract

The invention discloses an induction type rotor and a switched reluctance motor, and belongs to the field of switched reluctance motors. The induction type rotor comprises a rotor core and a conducting ring, wherein a salient pole is arranged on the rotor core, a pole body is arranged on the salient pole, and the conducting ring is arranged on the rotor by surrounding the pole body of the salient pole. The switched reluctance motor comprises a rotor and a stator, wherein the used rotor adopts the induction type rotor. The conducting rings are arranged on the salient poles of the rotor core, and induced current is generated by the conducting rings to form induction magnetic poles in the working process, so that a magnetic circuit is concentrated towards the salient poles of the rotor, and the magnetic energy utilization rate and the output torque are increased.

Description

Induction type rotor and switched reluctance motor
Technical Field
The invention relates to the field of switched reluctance motors, in particular to an induction type rotor and a switched reluctance motor.
Background
The principle of the switched reluctance motor is that a magnetic circuit is always closed to a path with the minimum magnetic resistance, and an ideal magnetic circuit path is that the magnetic circuit starts from a stator core electrified salient pole, passes through an air gap, then passes through a rotor core action salient pole, then passes through a rotor core yoke part, then passes through a rotor core action salient pole and then returns to the stator core electrified salient pole through the air gap; however, due to the limitation of iron core magnetizing saturation and the characteristic that the magnetic circuit diverges outside the magnetic pole, part of the magnetic circuit deviates from the designed path and is closed, even reverse torque is generated, so that the magnetic energy utilization rate is reduced, and the output torque is reduced.
It is further understood that the magnetic circuit is always concentrated towards the magnetic pole, and the salient pole of the switched reluctance motor has no magnetic pole polarity, so that the magnetic circuit cannot be concentrated towards the salient pole, and the magnetic energy utilization rate of the existing switched reluctance motor is low.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an induction type rotor and a switched reluctance motor.
The technical scheme adopted by the invention for solving the technical problem is as follows:
an induction rotor for a switched reluctance motor, the rotor comprising a rotor core and a conductive ring, the rotor core having salient poles disposed thereon, the salient poles having pole bodies, the conductive ring being disposed on the rotor through the pole bodies surrounding the salient poles.
In the invention, the conducting rings on the salient poles are independent from each other.
In the invention, the induction type rotor is further applied to a q-phase switched reluctance motor with a stator core having a pole number of m, q is more than or equal to 3, the number of salient poles on the rotor core is n, n is more than or equal to 2, m/n is q, the salient poles are also provided with pole wings, the left side and the right side of the radial outer end part of the pole body are respectively connected with the pole wings, the pole wings extend towards the outer side far away from the pole body, and the distance between the radial outer side surfaces of the pole wings and the center of the rotor core is gradually changed in the extending direction. On the basis, preferably, the radial outer side surfaces of the pole wings are arc surfaces, two pole wings on the same rotor core salient pole are equal in size and symmetrical in structure and are on the same arc surface, the central point of each arc surface is arranged on the central line of the pole body, and the radius R of each arc surface is smaller than the radius R of the rotor core.
In the invention, the induction type rotor is further applied to a q-phase switched reluctance motor with a stator core having a pole number of m, q is more than or equal to 3, the number of salient poles on the rotor core is n, n is more than or equal to 2, and m/n is q, the salient poles are also provided with pole wings, the left side and the right side of the radial outer end part of the pole body are respectively connected with the pole wings, the pole wings and the pole body are in a step shape with a high pole body and a low pole body, the pole wings extend towards the outer side far away from the pole body, the radial outer side surfaces of the pole wings are in a step shape, and in the extending direction of the pole wings, the distance between the radial outer side surfaces of the pole wings and the center of the rotor core is; the number of the steps on the left side and the right side of the pole body is x respectively, and x is more than or equal to 2.
In the present invention, further, the conductive ring is made of copper or aluminum.
The invention also provides a switched reluctance motor which comprises a rotor and a stator, wherein the rotor adopts the induction type rotor.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the conducting rings are arranged on the salient poles of the rotor core, and in the working process, the conducting rings generate induction current to form induction magnetic poles, so that a magnetic circuit is concentrated towards the salient poles of the rotor. When the rotor runs at a low speed, the magnetic field change is slowed down, the induced current is weakened, the motor performance tends to show the characteristics of a pure switched reluctance motor, and the characteristic of strong starting capability of the switched reluctance motor is reserved; when the rotor runs at high speed, the magnetic field change is accelerated, the induced current generated by the conducting ring is enhanced to generate an induced magnetic pole, and the action salient pole of the rotor generates permanent magnetic polarity, so that the output torque and the output power can be increased. Through tests, under the conditions that the voltage is the same, the rated rotating speed is higher than 1/3, and other structures of the two groups of switched reluctance motors are the same, the rotor of one group of switched reluctance motors is provided with the conducting ring, the rotor of the other group of switched reluctance motors is not provided with the conducting ring, and the output power of the motor provided with the conducting ring can be improved by at least 10%.
2. For the switched reluctance motor with the stator core pole number of m and the rotor core salient pole number of n, if the relation of the pole number ratio is m/n-q, the salient pole of the rotor core is further provided with a pole wing, so that an edge air gap is reduced, the radial outer side surface of the pole wing is an arc surface or a stepped surface, so that a gradual air gap is formed between the pole wing and the stator core salient pole, gradual inductance can be generated, and the purpose of reducing the torque pulsation of the switched reluctance motor is achieved.
Drawings
Fig. 1 is a schematic plan view of an induction rotor according to the present invention.
Fig. 2 is a schematic perspective view of an induction rotor in embodiment 1 of the present invention.
Fig. 3 is a schematic plan view of a switched reluctance motor having an induction rotor according to embodiment 1 of the present invention.
Fig. 4 is a schematic plan view of an induction rotor according to embodiment 2 of the present invention.
FIG. 5 is a schematic plan view of a switched reluctance motor with an induction rotor according to embodiment 2 of the present invention
The meanings of the labels in the figures are: 100-rotor, 110-rotor core, 111-salient pole, 111 a-pole body, 111 b-pole wing, 120-conducting ring, 200-stator.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by the following embodiments with reference to fig. 1-5. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to improve the output torque of the switched reluctance motor, the present invention provides an induction rotor 100, the induction rotor 100 comprises a rotor core 110 and a conducting ring 120, the rotor core 110 is provided with a salient pole 111, the salient pole 111 is provided with a pole body 111a, and the conducting ring 120 is arranged on the rotor 100 through the pole body 111a surrounding the salient pole 111. In the present invention, the conductive ring 120 may be made of a conductive material such as copper or aluminum. According to the invention, the conducting rings 120 are arranged on the salient poles 111 of the rotor core, in the working process, the conducting rings 120 generate induction current to form induction magnetic poles, when the rotor 100 runs at a high speed, the change of a magnetic field is accelerated, the induction current generated by the conducting rings 120 is enhanced to generate the induction magnetic poles, and the salient poles 111 of the rotor 100 generate permanent magnetic polarities, so that the output torque and the output power can be increased.
The conducting rings 120 on the salient poles 111 are preferably independent from each other, so that the concentration of a magnetic circuit to each acting salient pole 111 on the rotor core 110 is ensured, and the maximization of magnetic energy utilization is realized.
The salient pole of the rotor core can be a conventional rectangular salient pole, and can be applied to a common switched reluctance motor to achieve the purpose of increasing the magnetic energy utilization rate and the output torque.
In some preferred embodiments, the induction rotor 100 may also be applied to a q-phase switched reluctance motor having a stator core with a pole number of m, q ≧ 3, where n is the number of salient poles 111 on the rotor core 110, n ≧ 2, and m/n ═ q, the salient poles 111 of the rotor core of the present invention are preferably provided with pole wings 111b, i.e., the pole wings 111b are respectively connected to the left and right sides of the radially outer end of the pole body 111a, see fig. 1 and 2, the pole wings 111b extend outward away from the pole body 111a, and the distance between the radially outer side surfaces of the pole wings 111b and the center of the rotor core 110 in the extending direction changes in a gradually decreasing manner. On this basis, it is preferable that the radially outer side surface of the pole wing 111b is an arc surface, two pole wings 111b on the same rotor core salient pole 111 have the same size and are structurally symmetrical and are on the same arc surface, the center point of the arc surface is arranged on the center line of the pole body 111a, and the radius R of the arc surface is smaller than the radius R of the rotor core 110. When the rotor core 110 is applied to the switched reluctance motor, compared with a rectangular salient pole structure, the arrangement of the pole wings 111b can reduce the edge air gap, and the distance between the radial outer side surfaces of the pole wings 111b and the center of the rotor core 110 is set to be gradually reduced, so that the air gap between the pole wings and the stator core salient pole 111 is gradually changed when the pole wings are applied to the switched reluctance motor, thereby generating gradual inductance, further achieving the purpose of reducing the torque pulsation of the switched reluctance motor, and obtaining the switched reluctance motor with smaller torque pulsation.
In some preferred embodiments, the induction rotor 100 is applied to a q-phase switched reluctance motor having a stator core with a pole number of m, q is equal to or greater than 3, the number of salient poles 111 on the rotor core 110 is n, n is equal to or greater than 2, and m/n is equal to q, then the rotor core salient poles 111 of the present invention preferably further includes pole wings 111b, i.e., the left and right sides of the radially outer end of the pole body 111a are respectively connected with the pole wings 111b, the structural form of the pole wings 111b can be further preferably changed, i.e., the space between the pole wings 111b and the pole body 111a is stepped, i.e., the pole wings 111b are higher than the pole wings 111b, see fig. 4, the pole wings 111b extend to the outer side far from the pole body 111a, the radially outer side faces of the pole wings 111b are stepped, and the distance between the radially outer side faces of the pole wings 111b and the center of the rotor; the number of the steps on the left side and the right side of the pole body 111a is x respectively, and x is more than or equal to 2. By providing the stepped pole wing 111b, when the rotor core 110 is applied to a switched reluctance motor, a smoother change rate of the volume of the salient pole air gap can be obtained, so that the torque ripple is smoother, and the motor can run more smoothly.
Based on this, the invention also provides a switched reluctance motor with an induction type rotor, which is shown in fig. 3 and 5, and comprises a rotor 100 and a stator 200, wherein the structure of the rotor 100 adopts the structure described above. By arranging the conducting rings 120 on the salient poles 111 of the rotor core, in the working process, the conducting rings 120 generate induction current to form induction magnetic poles, so that a magnetic circuit is concentrated towards the rotor salient poles 111, when the rotor 100 runs at a high speed, the change of a magnetic field is accelerated, the induction current generated by the conducting rings 120 is enhanced to generate the induction magnetic poles, and the action salient poles 111 of the rotor 100 generate permanent magnetic polarities, so that the output torque and the output power can be increased. Through the arrangement of the pole wings, the air gaps between the pole wings and the salient poles of the stator core form gradually-changed air gaps, and meanwhile, the switched reluctance motor with smaller torque pulsation is obtained.
Example 1
Fig. 1-2 show a schematic view of an induction rotor according to the invention. The induction rotor 100 includes a rotor core 110 and a conducting ring 120, the rotor core 110 is provided with a salient pole 111, the salient pole 111 is provided with a pole body 111a, and the conducting ring 120 is provided on the rotor 100 through the pole body 111a surrounding the salient pole 111. The salient poles 111 of the rotor core 110 are further provided with pole wings 111b, the pole wings 111b are connected to the left and right sides of the radially outer end portions of the pole body 111a, respectively, the pole wings 111b extend outward away from the pole body 111a, and the distance between the radially outer side surfaces of the pole wings 111b and the center of the rotor core 110 in the extending direction changes in a gradually decreasing manner.
In the switched reluctance motor shown in fig. 3, the induction rotor 100 of the present embodiment is applied, the number of poles of the stator core of the switched reluctance motor is m 12, the number of phases q is 3, the number of salient poles 111 of the rotor core 110 is n 3, and the relationship of m/n q is satisfied, and the salient poles 111 of the rotor core 110 are further provided with pole pieces 111b, that is, the pole pieces 111b are connected to the left and right sides of the radially outer end portions of the pole pieces 111a, respectively, the pole pieces 111b extend outward away from the pole pieces 111a, and the distance between the radially outer side surfaces of the pole pieces 111b and the center of the rotor core 110 in the extending direction changes in a stepwise manner.
Example 2
Fig. 4 shows another schematic view of the induction rotor according to the invention. The induction rotor 100 includes a rotor core 110 and a conducting ring 120, the rotor core 110 is provided with a salient pole 111, the salient pole 111 is provided with a pole body 111a, and the conducting ring 120 is provided on the rotor 100 through the pole body 111a surrounding the salient pole 111. The salient pole 111 of the rotor core 110 is further provided with a pole wing 111b, the left side and the right side of the radial outer end part of the pole body 111a are respectively connected with the pole wing 111b, a step shape that the pole body 111a is higher than the pole wing 111b is formed between the pole wing 111b and the pole body 111a, the pole wing 111b extends towards the outer side far away from the pole body 111a, the radial outer side surface of the pole wing 111b is in a step shape, and in the extending direction of the pole wing 111b, the distance between the radial outer side surface of the pole wing 111b and the center of the rotor core 110 is gradually changed in a step shape; the number of steps on the left and right sides of the pole body 111a is 4.
In the switched reluctance motor shown in fig. 5, the induction rotor 100 of the present embodiment is applied, the number of poles of the stator core of the switched reluctance motor is m 12, the number of phases q is 3, the number of salient poles 111 on the rotor core 110 is n 3, and the relationship of m/n q is satisfied, the salient poles 111 of the rotor core 110 are further provided with pole pieces 111b, the left and right sides of the radial outer end portions of the pole pieces 111a are respectively connected with the pole pieces 111b, the pole pieces 111b and the pole pieces 111a are in a step shape with the pole pieces 111a higher than the pole pieces 111b, the pole pieces 111b extend to the outer side away from the pole pieces 111a, the radial outer side surfaces of the pole pieces 111b are in a step shape, and the distance between the radial outer side surfaces of the pole pieces 111b and the center of the rotor core 110 in the extending direction of the pole pieces 111b is gradually decreased; the number of steps on the left and right sides of the pole body 111a is 4.
Through tests, under the conditions that the voltage is the same, the rated rotating speed is higher than 1/3, and other structures of the two groups of switched reluctance motors are the same, the rotor of one group of switched reluctance motors is provided with the conducting ring, the rotor of the other group of switched reluctance motors is not provided with the conducting ring, and the output power of the motor provided with the conducting ring can be improved by at least 10%.
The invention is not limited to the specific details of construction and arrangement of parts illustrated and described herein, which are presently preferred, since various modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (7)

1. The utility model provides an induction type rotor, is applied to switched reluctance motor which characterized in that: the rotor comprises a rotor core and a conducting ring, a salient pole is arranged on the rotor core, a pole body is arranged on the salient pole, and the conducting ring is arranged on the rotor through the pole body surrounding the salient pole.
2. An induction rotor as defined in claim 1, wherein: the conducting rings on the salient poles are independent from each other.
3. An induction rotor according to claim 1, applied to a q-phase switched reluctance motor having a stator core with a pole number of m, q ≧ 3, characterized in that: the number of the salient poles on the rotor core is n, n is larger than or equal to 2, m/n is q, the salient poles are further provided with pole wings, the left side and the right side of the radial outer end of the pole body are respectively connected with the pole wings, the pole wings extend towards the outer side far away from the pole body, and the distance between the radial outer side faces of the pole wings and the center of the rotor core is gradually changed in the extending direction.
4. An induction rotor according to claim 1, applied to a q-phase switched reluctance motor having a stator core with a pole number of m, q ≧ 3, characterized in that: the number of the salient poles on the rotor iron core is n, n is more than or equal to 2, m/n is q, the salient poles are further provided with pole wings, the left side and the right side of the radial outer end part of the pole body are respectively connected with the pole wings, the pole wings and the pole body are in a step shape with the height of the pole body and the height of the pole body, the pole wings extend towards the outer side far away from the pole body, the radial outer side surfaces of the pole wings are in the step shape, and in the extending direction of the pole wings, the distance between the radial outer side surfaces of the pole wings and the center of the rotor iron core is gradually changed in a step; the number of the steps on the left side and the right side of the pole body is x respectively, and x is more than or equal to 2.
5. An induction rotor according to claim 3, characterized in that: the radial outer side surfaces of the pole wings are arc surfaces, two pole wings on the same rotor core salient pole are equal in size and symmetrical in structure and are arranged on the same arc surface, the central point of each arc surface is arranged on the central line of the pole body, and the radius R of each arc surface is smaller than the radius R of the rotor core.
6. An induction rotor as defined in claim 1, wherein: the conductive ring is made of copper or aluminum.
7. A switched reluctance motor comprises a rotor and a stator, and is characterized in that: the rotor is an induction rotor as claimed in any one of claims 1 to 6.
CN202011167173.4A 2020-10-27 2020-10-27 Induction type rotor and switched reluctance motor Pending CN112260424A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011167173.4A CN112260424A (en) 2020-10-27 2020-10-27 Induction type rotor and switched reluctance motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011167173.4A CN112260424A (en) 2020-10-27 2020-10-27 Induction type rotor and switched reluctance motor

Publications (1)

Publication Number Publication Date
CN112260424A true CN112260424A (en) 2021-01-22

Family

ID=74261539

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011167173.4A Pending CN112260424A (en) 2020-10-27 2020-10-27 Induction type rotor and switched reluctance motor

Country Status (1)

Country Link
CN (1) CN112260424A (en)

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