CN113809892A - Disc type permanent magnet motor with multiple power units - Google Patents

Disc type permanent magnet motor with multiple power units Download PDF

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Publication number
CN113809892A
CN113809892A CN202111034036.8A CN202111034036A CN113809892A CN 113809892 A CN113809892 A CN 113809892A CN 202111034036 A CN202111034036 A CN 202111034036A CN 113809892 A CN113809892 A CN 113809892A
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Prior art keywords
permanent magnet
motor
disc
power
magnet motor
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CN202111034036.8A
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Chinese (zh)
Inventor
邵玉峰
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Anhui Wofu Permanent Magnet Technology Co Ltd
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Anhui Wofu Permanent Magnet Technology Co Ltd
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Priority to CN202111034036.8A priority Critical patent/CN113809892A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K16/00—Machines with more than one rotor or stator
    • 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
    • H02K1/16—Stator cores with slots for windings
    • H02K1/165—Shape, form or location of the slots
    • 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
    • H02K1/2793—Rotors axially facing stators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • 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
    • H02K21/24—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings
    • 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

Abstract

The invention discloses a disc type permanent magnet motor with multiple power units, which comprises a plurality of motor power units, wherein each motor power unit is an independent disc type permanent magnet motor, each disc type permanent magnet motor comprises a double stator and a double permanent magnet rotor, and each motor power unit is independently connected with an external controller to realize independent control or centralized control of the motor power units.

Description

Disc type permanent magnet motor with multiple power units
Technical Field
The invention relates to the technical field of permanent magnet motors, in particular to a disc type permanent magnet motor with multiple power units.
Background
The permanent magnet motor has been widely used in recent years due to its high power density and high efficiency, and the output power and output torque of the motor are also getting larger and larger, and the volume and weight of the motor are also getting larger and larger, which brings great difficulty to the production and manufacture of the motor, and brings great difficulty to the design and production of the high voltage controller, for example: at present, load main drive motors used in industries such as mines, electric power, metallurgy, cement and the like are basically over 300kW, the voltage of the motors is basically 6kV and 10kV, and for the design and production of a motor stator, a high-voltage insulation structure is required; it is necessary for the motor controller to configure a high voltage inverter. The cost of the insulation structure of the high-voltage motor is obviously higher than that of the low-voltage motor, high-voltage electronic components and power supplies are very expensive, and the performance and reliability of the insulation structure of the high-voltage motor are far lower than those of a low-voltage frequency converter.
There have been many studies in the field of multi-disc combination of disc motors, such as: the patent of "multilayer disc motor and car with the motor" with patent No. CN107370317A focuses on switching between star connection and delta connection of multiple disc windings to obtain better motor performance and generator performance, that is, it adopts a multi-disc structure for not solving the high-voltage and high-power problems of motor and controller, and the patent of "a low-voltage and high-power axial combined disc permanent magnet motor" with patent No. CN108964389B describes a high-power motor adopting a multi-motor unit combination design, but its motor stator disc is composed of a stator yoke disc and a stator tooth block, which is not beneficial to production and manufacturing.
The invention splits the high power of the motor into small power units, superposes or reduces the power according to the load condition in the working process, avoids the condition that a big horse pulls a trolley, and further realizes the functions of overload protection, soft start, speed regulation and the like.
Disclosure of Invention
The invention aims to provide a disc type permanent magnet motor with multiple power units, which splits the high power of the motor into small power units, adopts a low-voltage motor structure and a disc type motor structure, and ensures that the axial size of the motor is short and is not too large after being superposed.
The purpose of the invention can be realized by the following technical scheme:
a disc type permanent magnet motor with multiple power units comprises a plurality of motor power units, wherein each motor power unit is an independent disc type permanent magnet motor, and each disc type permanent magnet motor comprises double stators and double permanent magnet rotors;
each motor power unit is independently connected with an external controller, so that the independent control or the centralized control of the motor power units is realized.
As a further scheme of the invention: the power of a plurality of said motor power units can be equal or unequal.
As a further scheme of the invention: the stator of the disc type permanent magnet motor is composed of a slotted winding type iron core and a coil winding embedded in a slot, and the center lines of the A-phase windings of the double stators are aligned.
As a further scheme of the invention: the permanent magnet rotor of the disc type permanent magnet motor is composed of a yoke plate and permanent magnets arranged on two sides of the yoke plate, the polarities of opposite surfaces of the permanent magnets on two sides are consistent, and the magnet center lines are aligned.
As a further scheme of the invention: and yoke plates of the motor power units are fixedly connected with the rotating shaft so as to output the combined torque and power.
As a further scheme of the invention: the permanent magnets are alternately arranged on the yoke plate in an N pole and an S pole.
As a further scheme of the invention: the coil winding adopts fractional slot concentrated winding, the winding pitch is 1, and the number q of slots of each pole and each phase is
Figure BDA0003246399900000021
As a further scheme of the invention: and the external controller adopts a low-voltage frequency converter to control the disc type permanent magnet motor.
As a further scheme of the invention: the stator winding of the disc permanent magnet motor can be one phase or multiple phases which are symmetrically connected.
As a further scheme of the invention: the stator windings of the two stator discs of the disc-type permanent magnet motor can be connected in series or in parallel.
As a further scheme of the invention: the motor power unit can be designed with a low voltage class.
The invention has the beneficial effects that:
(1) the high-power motor is split into the plurality of low-power motors, so that the power unit of the motor does not need to adopt a high-voltage grade design, the motor is simple to produce and manufacture, compact in structure and free to operate and control, can be controlled by a low-voltage frequency converter with better performance and reliability, is low in cost and high in safety, and is added with the functions of overload protection, soft start, speed regulation and the like, so that the motor is high in practicability and flexibility;
(2) the invention adopts the multi-power unit to split the high-power motor into a plurality of low-power motors for design and production, and does not need to adopt a high-voltage motor insulation structure, thereby greatly reducing the production difficulty and the production cost of the motor;
(3) the multi-power unit disc type permanent magnet motor can be controlled by adopting the low-voltage frequency converter with better performance and reliability, so that the reliability of the controller is greatly improved, and the cost of the controller is reduced;
(4) according to the multi-power-unit disc type permanent magnet motor, the power unit adopts a double-stator and double-rotor structure, so that the inherent axial force of the disc type motor is actively eliminated (the disc type motor with a single stator and a single rotor has axial force in principle);
(5) the multi-power unit disc type permanent magnet motor has better fault-tolerant capability, and when one power unit has a problem, the other power units can also normally operate;
(6) according to the multi-power-unit disc type permanent magnet motor, due to the characteristics of short axial size and high power density of the disc type motor, after the multi-power-unit disc type permanent magnet motor is adopted, the axial size is shorter than that of a radial magnetic flux motor.
Drawings
The invention will be further described with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a multi-power unit disc type permanent magnet motor of the present invention.
Fig. 2 is a schematic diagram of a single power cell configuration of the present invention.
Fig. 3 is a schematic view of a stator disc wound core.
Fig. 4 is a schematic diagram of a power unit in which two stator windings are connected in series according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a power unit according to an embodiment of the present invention in which two stator windings are connected in parallel.
Fig. 6 is a schematic center line alignment diagram of a slotted dual stator wound core phase a winding in a power unit in accordance with an embodiment of the present invention.
Fig. 7 is a schematic diagram showing the alignment of the polarity and the center line of the permanent magnets on both sides of the yoke plate in the power unit according to the embodiment of the present invention.
Fig. 8 is a schematic diagram of a controller for two power cell sets according to an embodiment of the present invention.
Fig. 9 is a schematic diagram of the power inequality between two power units according to the embodiment of the present invention.
In the figure: 1. a rotating shaft; 2. slotting a wound core; 21. a coil winding; 3. a yoke plate; 4. and a permanent magnet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention relates to a multi-power-unit disc type permanent magnet motor which comprises a plurality of motor power units, wherein each motor power unit is an independent disc type permanent magnet motor and is independently connected with an external controller, so that the independent control or the centralized control of the motor power units is realized;
referring to fig. 2 specifically, the motor power unit adopts a double-stator and permanent magnet double-rotor structure, the stator windings can be one phase or multiple phases which are symmetrically connected, the embodiment is a three-phase winding Y-connection method, and the stator windings can be connected in series (as shown in fig. 4) or connected in parallel (as shown in fig. 5) between two stator discs;
however, in actual manufacturing, the phase resistances of the windings, such as a1 and a2, cannot be absolutely equal, so that the parallel connection method may generate circulating currents, and the following measures are required for achieving the optimal effect of the disc type permanent magnet motor of the power unit:
s1: as shown in fig. 3, in order to eliminate the cogging torque, the wound core 2 is a skewed slot or a permanent magnet rotor skewed pole (no skewed slot is shown in fig. 3), and the skewed slot or the skewed pole can weaken the tooth harmonic caused by slotting the core, thereby improving the air gap flux density waveform;
s2: the coil winding 21 adopts fractional slot concentrated winding, the winding pitch is 1, and the number q of slots of each pole and each phase is
Figure BDA0003246399900000051
Compared with an integral slot, the problem that the number of poles of a low-speed motor is large and the number of slots is limited is solved, the number of slots under each pair of poles is reduced, the slot fullness rate is improved, the number of elements is small, the wire inserting and wiring process can be simplified, and the cost is reduced; the short distance and the distribution effect of the winding are increased, and the waveform of the counter potential is improved; because the pitch is 1, each coil is only wound on one tooth, the perimeter and the end extension length of the coil are shortened, the copper consumption is reduced, the resistance and the copper consumption are reduced, and the motor efficiency is further improved; the end parts of the coils are not overlapped, and interphase insulation is not required to be arranged; the automatic winding production process is more convenient to adopt;
s3: the surface of the wound iron core 2 can generate eddy current under the action of an alternating magnetic field so as to generate loss, in order to reduce the loss to the maximum extent, the wound iron core 2 adopts a cold-rolled silicon steel sheet (such as 0.35mm, 0.2mm or thinner) or a material similar to the material with good magnetic conductivity and eddy current reduction performance, and the wound interlayer insulation is processed well in the processing;
s4: as shown in fig. 3, the wound core is formed by winding according to a spiral line, and the outer circle of each layer is not a regular perfect circle, so that the center distance of each adjacent groove is not equal when the groove is punched, and a special punching process is needed to ensure the uniformity of the groove shape.
S5: as shown in fig. 6, the stator of the disc-type permanent magnet motor is composed of a slotted wound core 2 and a coil winding 21 embedded in a slot, and the center lines of the a-phase windings of the slotted double-stator wound core are aligned, i.e. the center lines of a1 and a2 are ensured to be aligned;
s6: as shown in fig. 7, the permanent magnet rotor of the disk-type permanent magnet motor is composed of a yoke plate 3 and permanent magnets 4 arranged on both sides of the yoke plate 3, and the polarities of the opposite surfaces of the permanent magnets 4 on both sides are consistent, and the magnet center lines are aligned.
The power of the motor power units can be equal or unequal, and the use flexibility of the disc type permanent magnet motor with the multiple power units is improved.
The yoke plates 3 of the motor power units are fixedly connected with the rotating shaft 1, so that the output of the combined torque and power is realized.
The permanent magnets 4 are alternately arranged on the yoke plate 3 in an N pole and an S pole.
Wherein, external controller adopts the low-voltage inverter to control disk permanent-magnet machine, makes disk permanent-magnet machine's manufacturing simple, can adopt the better low-voltage inverter of performance and reliability to control, and is with low costs and the security is high.
Example 2
As shown in fig. 1, the embodiment of this embodiment is substantially the same as the embodiment of example 1, except that this embodiment includes two motor power units and two controllers, the motor power units are separately controlled, and the black dots in fig. 1 indicate that several motor power units are omitted.
Example 3
As shown in fig. 8, the embodiment of the present embodiment is substantially the same as the embodiment of embodiment 2, except that two motor power units are controlled by one controller.
Example 4
As shown in fig. 9, the embodiment of the present embodiment is substantially the same as the embodiment of embodiment 1, except that the powers of the two motor power units are not equal, and the two motor power units are separately controlled by the controller.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims (9)

1. The disc type permanent magnet motor with multiple power units is characterized by comprising a plurality of motor power units, wherein each motor power unit is an independent disc type permanent magnet motor which comprises double stators and double permanent magnet rotors;
the stator of the disc type permanent magnet motor is composed of a slotted winding type iron core (2) and a coil winding (21) embedded in a slot, and the central lines of the A-phase windings of the double stators are aligned;
each motor power unit is independently connected with an external controller, so that the independent control or the centralized control of the motor power units is realized.
2. A multiple power cell disc permanent magnet machine according to claim 1, wherein the power of a plurality of said machine power cells is equal or unequal.
3. The disc type permanent magnet motor with multiple power units as claimed in claim 1, wherein the permanent magnet rotor of the disc type permanent magnet motor is composed of a yoke plate (3) and permanent magnets (4) arranged on two sides of the yoke plate (3), the polarities of the opposite surfaces of the permanent magnets (4) on the two sides are consistent, and the magnet center lines are aligned.
4. A multi-power-unit disc-type permanent magnet motor according to claim 3, wherein the yoke plates (3) of a plurality of said motor power units are fixedly connected to the rotating shaft (1).
5. A multi-power-unit disc permanent magnet machine according to claim 3, characterized in that the permanent magnets (4) are arranged alternately with N-poles and S-poles on the yoke plate (3).
6. A multi-power-unit disc permanent magnet machine according to claim 1, characterized in that the coil winding (21) is a fractional-slot concentrated winding with a winding pitch of 1 and a number of slots per pole per phase q of 1
Figure FDA0003246399890000011
7. The disc-type permanent magnet motor with multiple power units as claimed in claim 1, wherein the external controller controls the disc-type permanent magnet motor by using a low voltage frequency converter.
8. The disc permanent magnet motor with multiple power units of claim 1, wherein the stator windings of the disc permanent magnet motor are one phase or multiple phases symmetrically connected.
9. The disc permanent magnet motor of claim 8, wherein the stator windings of the two stator discs of the disc permanent magnet motor are connected in series or in parallel.
CN202111034036.8A 2021-09-03 2021-09-03 Disc type permanent magnet motor with multiple power units Pending CN113809892A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1034641A (en) * 1987-12-30 1989-08-09 上海现代信息技术研究所 Axial air gap electric machine
CN102868267A (en) * 2012-09-28 2013-01-09 北京交通大学 Multi-power solid rotor and laminated rotor tandem type permanent magnet synchronous motor system
CN206389221U (en) * 2016-12-27 2017-08-08 平顶山仁和电力科技有限公司 A kind of bimorph transducer single rotor from shock-absorbing motor
CN108964389A (en) * 2018-08-31 2018-12-07 沈阳工业大学 A kind of low-pressure high-power axial direction combination disc-type permanent magnet motor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1034641A (en) * 1987-12-30 1989-08-09 上海现代信息技术研究所 Axial air gap electric machine
CN102868267A (en) * 2012-09-28 2013-01-09 北京交通大学 Multi-power solid rotor and laminated rotor tandem type permanent magnet synchronous motor system
CN206389221U (en) * 2016-12-27 2017-08-08 平顶山仁和电力科技有限公司 A kind of bimorph transducer single rotor from shock-absorbing motor
CN108964389A (en) * 2018-08-31 2018-12-07 沈阳工业大学 A kind of low-pressure high-power axial direction combination disc-type permanent magnet motor

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