CN211405819U - A permanent magnet motor - Google Patents

Abstract

The utility model relates to the technical field of permanent magnet motors, and discloses a permanent magnet motor, which comprises a motor casing, a rotor structure and a stator structure; the rotor structure includes a magnet conducting body and a permanent magnet group, and the stator structure includes a sequence from the inside to the outside. The inner stator and the outer stator are coaxially sleeved; a plurality of the permanent magnet groups are arranged on the magnetic conductor in a circular array, and the permanent magnet group separates the magnetic conductor into the inner magnetic pole of the rotor and the outer magnetic pole of the rotor; The magnetization directions of the adjacent permanent magnet groups are opposite; the permanent magnet group includes a left permanent magnet and a right permanent magnet, the inner ends of the left permanent magnet and the right permanent magnet are provided with a gap, and the outer stator and the rotor are The outer magnetic poles form the outer air gap magnetic field of the motor, and the inner stator and the rotor inner magnetic poles form the inner air gap magnetic field of the motor. Two air gap magnetic fields are provided to achieve double air gaps using a double stator structure, doubling the air gap for the motor.

Description

A permanent magnet motor

technical field

The utility model relates to the technical field of permanent magnet motors, in particular to a permanent magnet motor.

Background technique

A motor is an electromagnetic mechanical device that converts electrical energy into mechanical energy, and the power conversion and transmission of the motor occurs in the air gap between the stator and the rotor. Now all motors in the world are composed of a stator and a rotor. This motor has only one air gap magnetic field. When the motor is running, the magnetic field of one of the stator and the rotor of the motor is always fixed, and the air gap magnetic field of the motor can only be changed by the change of the other magnetic field to make the motor work. This greatly limits the efficiency and power density of the motor.

Utility model content

The utility model mainly provides a permanent magnet motor, which solves the problem that the efficiency and power density of the motor are greatly limited in the prior art.

In order to solve the above-mentioned technical problems, the utility model adopts the following technical solutions:

A permanent magnet motor, comprising a motor casing, a rotor structure and a stator structure; the rotor structure includes a magnetic conductor and a permanent magnet group, and the stator structure includes an inner stator and an outer stator that are coaxially sleeved from the inside to the outside in sequence; The permanent magnet groups are arranged on the magnet conductors in a circular array, and the permanent magnet groups divide the magnet conductors into rotor inner magnetic poles and rotor outer magnetic poles; the magnetizing directions of the adjacent permanent magnet groups are opposite; The permanent magnet group includes a left permanent magnet and a right permanent magnet, the inner ends of the left permanent magnet and the right permanent magnet are provided with a gap, the outer stator and the outer magnetic pole of the rotor form an outer air gap magnetic field of the motor, and the outer magnetic field of the motor is formed by the outer stator and the outer magnetic pole of the rotor. The inner stator and the inner magnetic poles of the rotor form an inner air gap magnetic field of the motor.

The purpose of the present invention is to provide a permanent magnet motor with two air gap magnetic fields and two magnetic circuits for each magnetic pole. This technology doubles the air gap area of the motor and doubles the magnetic circuit. The bidirectional variable magnetic motor is composed of an outer stator, a rotor and an inner stator. The rotor part adopts a magnetic pole with inner and outer double-sided magnetic poles, and each magnetic pole of the rotor is composed of two sets of independent magnetic fields. The outer magnetic pole of the rotor and the outer stator An outer air gap magnetic field is formed between them, and an inner air gap magnetic field is formed between the inner magnetic poles of the rotor and the inner stator. When the air gap magnetic field of the motor changes, one group of magnetic fields of each magnetic pole of the rotor will increase, and the other group of magnetic fields will decrease, and the magnetic field of each group of rotor magnetic poles changes with the change of the stator magnetic field; Two sets of magnetic field changes on the rotor poles drive the motor rotor to rotate. Since the electromagnetic torque of the motor is proportional to the square of the air gap diameter, the double air gap formed by the double stator structure doubles the air gap for the motor.

Further, the distance between the inner surface of the outer stator and the inner surface of the magnetic conductor is 0.2 mm to 1 mm; the distance between the outer surface of the inner stator and the inner surface of the magnetic conductive body is 0.2 mm to 1 mm. 1mm.

Further, the outer ends of the left permanent magnet and the right permanent magnet are provided with isolation reinforcements made of non-magnetic conductive material.

Further, the inner stator includes an inner stator iron core and an inner stator winding arranged on the inner stator iron core, the outer stator includes an outer stator iron core, and an outer stator arranged on the outer stator iron core winding; the inner stator iron core is installed on the fixed shaft of the motor rotor, the outer stator iron core is installed on the inner wall of the motor casing, and the inner stator iron core and the outer stator iron core have the same number of winding slots , the winding modes of the inner stator winding and the outer stator winding are the same, and the winding phases of the inner stator winding and the outer stator winding are different by 180 degrees. The stator structure of this scheme adopts fractional slot, single-layer and double-layer hybrid concentrated winding. The beneficial effect of this winding is to reduce the cogging torque of the motor, improve the output torque of the motor, reduce the usage of copper wires, and reduce the The resistance of the winding reduces the copper loss of the motor and reduces the temperature rise of the motor.

Further, it includes a front end cover; the front end cover is arranged at the front end of the magnetic conductor, and the front end cover is provided with a rotating shaft that is coaxial with the magnetic conductor and a mounting position for installing a bearing; the front end cover is connected to the Flanges are arranged between the magnetic conductors and at the other end of the magnetic conductors, and bolts for connecting the flanges at both ends of the magnetic conductors are arranged through the gaps. In this scheme, the rear end cover on the rotor is removed, and the rotor is suspended between the inner and outer stators of the motor. The magnetic poles of the rotor are suspended between the inner and outer stators, and at the same time, the materials constituting the rotor structure are reduced, and the weight of the entire rotor structure is very light, so that the rotational inertia of the rotor is very low, the acceleration or deceleration of the motor is faster, and the motor accelerates more energy efficient.

Further, it also includes a first end cover, a second end cover and a fixed shaft; the first end cover and the second end cover are respectively arranged on the motor casing corresponding to both ends of the outer stator; The middle part of the end cover is provided with a bearing hole that is coaxial with the outer stator and used to install the bearing, the fixed shaft is arranged coaxially with the inner stator, and one end of the fixed shaft is fixed on the second end cover , the other end of the fixed shaft is installed in the installation position through the inner stator.

Further, the thickness of the inner magnetic pole of the rotor is 5 mm to 10 mm, the thickness of the outer magnetic pole of the rotor is the same as that of the inner magnetic pole of the rotor, and the distance between the isolation reinforcements between the adjacent permanent magnet groups is 1mm to 3mm, the distance from the inner end surface of the isolation reinforcement member to the inner wall of the inner magnetic pole of the rotor is 0.5mm to 1mm, and the distance from the outer end surface of the isolation reinforcement member to the outer wall of the outer magnetic pole of the rotor is 0.5mm to 1mm, so The thickness of the isolation reinforcement in the direction of the permanent magnet group array is 5 mm to 10 mm.

Further, recesses are provided on one side surface of the isolation reinforcement member close to the left permanent magnet and the right permanent magnet.

Further, the left permanent magnet and the right permanent magnet are provided with grooves on the side of the inner magnetic pole of the rotor, and the inner magnetic pole of the rotor is provided with convex strips matched with the grooves.

Further, the magnetic conductor, the inner stator iron core and the outer stator iron core are all formed by stacking silicon steel sheets.

Beneficial effects: The utility model provides a dual-phase synchronous drive permanent magnet motor with two air-gap magnetic fields and two magnetic circuits for each magnetic pole. This technology doubles the air-gap area of the motor and doubles the magnetic field. road. The bidirectional variable magnetic motor is composed of an outer stator, a rotor and an inner stator. The rotor part adopts a magnetic pole with inner and outer double-sided magnetic poles, and each magnetic pole of the rotor is composed of two sets of independent magnetic fields. The outer magnetic pole of the rotor and the outer stator An outer air gap magnetic field is formed between them, and an inner air gap magnetic field is formed between the inner magnetic poles of the rotor and the inner stator. When the air gap magnetic field of the motor changes, one group of magnetic fields of each magnetic pole of the rotor will increase, and the other group of magnetic fields will decrease, and the magnetic field of each group of rotor magnetic poles changes with the change of the stator magnetic field; Two sets of magnetic field changes on the rotor poles drive the motor rotor to rotate. Since the electromagnetic torque of the motor is proportional to the square of the air gap diameter, the double air gap formed by the double stator structure doubles the air gap for the motor.

Description of drawings

1 is a schematic half-section schematic diagram of the motor structure of the present embodiment;

FIG. 2 is a half-section schematic diagram of the rotor structure of the present embodiment;

FIG. 3 is a schematic structural diagram of the magnetic conductor of this embodiment;

4 is an enlarged schematic diagram of part A of the present embodiment;

5 is a schematic diagram of the installation of the stator structure of the present embodiment;

6 is a schematic half-section schematic diagram of the stator structure of the present embodiment;

Fig. 7 is the stator winding distribution diagram of this embodiment;

Reference numerals: magnet 1, rotor inner magnetic pole 11, rotor outer magnetic pole 12, protruding strip 13, flange 14, permanent magnet group 2, left permanent magnet 21, right permanent magnet 22, groove 23, gap 3, Isolation reinforcement 4, recess 41, front end cover 5, installation position 51, rotating shaft 52, inner stator iron core 6, outer stator iron core 7, fixed shaft 8, motor casing 9, first end cover 91, second end cover 92 , bearing seat 93 , winding tooth slot 10 .

Detailed ways

The technical solution of a permanent magnet motor involved in the present invention will be further described in detail below with reference to the embodiments.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. Detachable connection, or integral connection; may be mechanical connection or electrical connection; may be direct connection, or indirect connection through an intermediate medium, or internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

As shown in FIGS. 1 to 7 , a permanent magnet motor in this embodiment includes a motor casing 9, a rotor structure and a stator structure; the rotor structure includes a magnetic conductor 1 and a permanent magnet group 2, and the stator structure includes a The inner stator and the outer stator are coaxially sleeved from the inside to the outside; a plurality of the permanent magnet groups 2 are arranged on the magnet conductor 1 in a circular array, and the permanent magnet group 2 separates the magnet conductor 1 into the inner magnetic poles of the rotor 11 and the outer magnetic pole 12 of the rotor; the magnetization directions of the adjacent permanent magnet groups are opposite; the permanent magnet group 2 includes a left permanent magnet 21 and a right permanent magnet 22, and the left permanent magnet 21 and the right permanent magnet 22 are The inner end is provided with a gap 3, and the outer stator and the outer magnetic poles 12 of the rotor form the outer air gap magnetic field of the motor. The inner stator and the inner magnetic poles 11 of the rotor form an inner air gap magnetic field of the motor. The distance between the inner side of the outer stator and the inner side of the magnetizer 1 is 0.2mm to 1mm; the distance between the outer side of the inner stator and the inner side of the magnetizer 1 is 0.2mm to 1mm. 1mm. The distance between the inner side of the outer stator and the inner side of the magnetizer 1 is 0.2mm to 1m; the distance between the outer side of the inner stator and the inner side of the magnetizer 1 is 0.2mm to 1m. 1mm. The inner stator includes an inner stator iron core 6 and inner stator windings arranged on the inner stator iron core 6 , the outer stator includes an outer stator iron core 7 , and an inner stator winding arranged on the outer stator iron core 7 . The outer stator winding; the inner stator iron core 6 is installed on the fixed shaft 8 of the motor rotor, the outer stator iron core 7 is installed on the inner wall of the motor casing 9, the inner stator iron core 6 and the outer stator iron core 7 The number of winding slots 10 is the same, the inner stator winding and the outer stator winding are wound in the same way, and the winding phases of the inner stator winding and the outer stator winding are 180 degrees out of phase. It includes a front end cover 5; the front end cover 5 is arranged at the front end of the magnetic conductor 1, and the front end cover 5 is provided with a rotating shaft 52 coaxial with the magnetic conductor 1 and an installation position 51 for installing the bearing; A flange 14 is provided between the front end cover 5 and the magnetic conductor 1 and at the other end of the magnetic conductor 1 , and bolts for connecting the flanges 14 at both ends of the magnetic conductor 1 are provided through the gap 3 . . It also includes a first end cover 91, a second end cover 92 and a fixed shaft 8; the first end cover 91 and the second end cover 92 are respectively disposed on the motor casing 9 corresponding to both ends of the outer stator; The middle part of the first end cover 91 is provided with a bearing hole coaxial with the outer stator and used for installing a bearing, the fixed shaft 8 is arranged coaxially with the inner stator, and one end of the fixed shaft 8 Fixed on the second end cover 92 , the other end of the fixed shaft 8 is installed in the installation position 51 through the inner stator. The thickness of the rotor inner layer magnetic pole 11 is 5 mm to 10 mm, the thickness of the rotor outer layer magnetic pole 12 is the same as that of the rotor inner layer magnetic pole 11, and the thickness of the isolation reinforcement 4 between the adjacent permanent magnet groups is The distance is 1mm to 3mm, the distance from the inner end surface of the isolation reinforcement 4 to the inner wall of the rotor inner magnetic pole 11 is 0.5 mm to 1 mm, and the distance from the outer end surface of the isolation reinforcement 4 to the outer wall of the rotor outer magnetic pole 12 0.5mm to 1mm, the thickness of the isolation reinforcement 4 in the direction of the permanent magnet group array is 5mm to 10mm. A recess 41 is provided on one side of the isolation reinforcement 4 close to the left permanent magnet 21 and the right permanent magnet 22. The left permanent magnet 21 and the right permanent magnet 22 are provided with grooves 23 on the side of the rotor inner magnetic pole 11 , and the rotor inner magnetic pole 11 is provided with a protruding strip 13 matched with the groove 23 . . The magnetic conductor 1 , the inner stator iron core 6 and the outer stator iron core 7 are all formed by stacking silicon steel sheets.

Specifically, the rotor inner magnetic pole 11 and the rotor outer magnetic pole 12 have the same thickness, and the thickness of the rotor inner magnetic pole 11 is set as a; the thickness of the left permanent magnet 21 and the right permanent magnet 22 are the same, and the thickness of the left permanent magnet 21 Set as b; set the thickness of the isolation reinforcement 4 as c; set the distance between adjacent isolation reinforcements 4 as d; set the distance from the inner end face of the isolation reinforcement 4 to the inner wall of the inner magnetic pole 11 of the rotor as e; The distance from the outer end face of the reinforcement 4 to the inner wall of the rotor outer magnetic pole 12 is set as f; in this embodiment, a is 6 mm, b is 5 mm, c is 7 mm, d is 2 mm, e is 0.8 mm, and f is 0.8 mm .

In the rotor structure of this scheme, the permanent magnet group 2 is used to separate the magnetic conductor 1 into the rotor inner magnetic pole 11 and the rotor outer magnetic pole 12, which are used as the inner and outer magnetic poles of the rotor, and the permanent magnet group 22 is used as the constant magnetic source of the rotor. , The outer magnetic pole provides magnetic force. The rotor structure has inner and outer double-sided magnetic poles, and each magnetic pole of the rotor is composed of two sets of independent magnetic fields to form two magnetic circuits. decrease. While driving the rotor to rotate, the stator magnetic field also controls the change of the size of the two magnetic fields of the rotor magnetic poles, so as to improve the efficiency of the motor by the change of the size of the two magnetic paths of the rotor.

The stator structure of this scheme adopts fractional slot, single-layer and double-layer hybrid concentrated winding. The beneficial effect of this winding is to reduce the cogging torque of the motor, improve the output torque of the motor, reduce the usage of copper wires, and reduce the The resistance of the winding reduces the copper loss of the motor and reduces the temperature rise of the motor. Remove the rear end cover on the rotor, and the rotor is suspended between the inner and outer stators of the motor, mainly relying on the bearings on the main shaft, the front end cover 5 of the rotor, the middle bearing seat 93 of the motor, the front end cover 5 of the motor and the motor casing 9 The rotor magnetic pole is suspended between the inner and outer stators, and at the same time, the materials constituting the rotor structure are reduced, and the entire rotor structure is light in weight, so that the rotational inertia of the rotor is very low, the acceleration or deceleration of the motor is faster, and the motor More energy efficient when accelerating.

The purpose of the present invention is to provide a permanent magnet motor with two air gap magnetic fields and two magnetic circuits for each magnetic pole. This technology doubles the air gap area of the motor and doubles the magnetic circuit. The bidirectional variable magnetic motor is composed of an outer stator, a rotor and an inner stator. The rotor part adopts a magnetic pole with inner and outer double faces, and each magnetic pole of the rotor is composed of two independent magnetic fields. The outer magnetic pole 12 of the rotor is connected to the outer magnetic field. An outer air gap magnetic field is formed between the stators, and an inner air gap magnetic field is formed between the inner magnetic poles 11 of the rotor and the inner stator. When the air gap magnetic field of the motor changes, one group of magnetic fields of each magnetic pole of the rotor will increase, and the other group of magnetic fields will decrease, and the magnetic field of each group of rotor magnetic poles changes with the change of the stator magnetic field; Two sets of magnetic field changes on the rotor poles drive the motor rotor to rotate. Since the electromagnetic torque of the motor is proportional to the square of the air gap diameter, the double air gap formed by the double stator structure doubles the air gap for the motor.

Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes and modifications can be made to these embodiments without departing from the principles and spirit of the present invention , alternatives and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (10)

1. a permanent magnet motor, comprising a motor casing, a rotor structure and a stator structure; it is characterized in that: the rotor structure comprises a magnetic conductor and a permanent magnet group, and the stator structure comprises an inner stator that is coaxially sleeved from the inside to the outside in turn and the outer stator; a plurality of the permanent magnet groups are arranged in a circular array on the magnetic conductor, and the permanent magnet group divides the magnetic conductor into the inner magnetic pole of the rotor and the outer magnetic pole of the rotor; adjacent to the permanent magnet group The magnetizing directions are opposite; the permanent magnet group includes a left permanent magnet and a right permanent magnet, a gap is provided between the inner ends of the left permanent magnet and the right permanent magnet, and the outer stator and the outer magnetic pole of the rotor form the outer surface of the motor. The air gap magnetic field, the inner stator and the inner magnetic poles of the rotor form the inner air gap magnetic field of the motor. 2 . The permanent magnet motor according to claim 1 , wherein the distance between the inner side surface of the outer stator and the inner side surface of the magnetic conductor is 0.2 mm to 1 mm; the outer side surface of the inner stator is 0.2 mm to 1 mm. The distance between the side surface and the inner side surface of the magnet conducting body is 0.2 mm to 1 mm. 3 . The permanent magnet motor according to claim 1 , wherein the outer ends of the left permanent magnet and the right permanent magnet are provided with isolation reinforcements made of non-magnetic conductive material. 4 . 4 . The permanent magnet motor according to claim 1 , wherein the inner stator includes an inner stator iron core and an inner stator winding arranged on the inner stator iron core, and the outer stator includes an outer stator. 5 . a stator iron core, and an outer stator winding arranged on the outer stator iron core; the inner stator iron core is installed on the fixed shaft of the motor rotor, the outer stator iron core is installed on the inner wall of the motor casing, the The inner stator core and the outer stator core have the same number of winding slots, the inner stator winding and the outer stator winding are wound in the same way, and the winding phases of the inner stator winding and the outer stator winding differ by 180 degrees. 5 . The permanent magnet motor according to claim 1 , characterized in that it comprises a front end cover; the front end cover is arranged on the front end of the magnetic conductor, and the front end cover is provided with a coaxial center with the magnetic conductor. 6 . The rotating shaft and the installation position for installing the bearing; flanges are provided between the front end cover and the magnetic conductive body and the other end of the magnetic conductive body, and a flange for connecting the two ends of the magnetic conductive body is provided through the gap. the flange bolts. 6 . The permanent magnet motor according to claim 5 , further comprising a first end cover, a second end cover and a fixed shaft; the first end cover and the second end cover are respectively arranged on the on the motor casing corresponding to both ends of the outer stator; the middle part of the first end cover is provided with bearing holes coaxial with the outer stator and used for installing bearings, and the fixed shaft is coaxial with the inner stator In the configuration, one end of the fixed shaft is fixed on the second end cover, and the other end of the fixed shaft penetrates the inner stator and is installed in the installation position. 7 . The permanent magnet motor according to claim 3 , wherein the thickness of the inner magnetic pole of the rotor is 5 mm to 10 mm, and the thickness of the outer magnetic pole of the rotor is the same as that of the inner magnetic pole of the rotor, so The spacing between the isolation reinforcements between the adjacent permanent magnet groups is 1 mm to 3 mm, the distance from the inner end face of the isolation reinforcement to the inner wall of the inner magnetic pole of the rotor is 0.5 mm to 1 mm, and the outer surface of the isolation reinforcement is 0.5 mm to 1 mm. The distance from the end face to the outer wall of the outer magnetic pole of the rotor is 0.5 mm to 1 mm, and the thickness of the isolation reinforcement in the direction of the permanent magnet group array is 5 mm to 10 mm. 8 . The permanent magnet motor according to claim 3 , wherein a recess is provided on a side surface of the isolation reinforcement member close to the left permanent magnet and the right permanent magnet. 9 . 9 . The permanent magnet motor according to claim 1 , wherein the left permanent magnet and the right permanent magnet are provided with grooves on the side of the inner magnetic pole of the rotor, and the inner magnetic pole of the rotor is provided with a groove. 10 . There are protruding strips matched with the grooves. 10 . The permanent magnet motor according to claim 4 , wherein the magnetic conductor, the inner stator iron core and the outer stator iron core are all made of stacked silicon steel sheets. 11 .

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