CN221428757U - Permanent magnet synchronous linear motor based on stator double-sided half-tooth slot structure - Google Patents

Abstract

The utility model relates to the field of permanent magnet synchronous linear motors, and discloses a permanent magnet synchronous linear motor based on a stator double-sided half-tooth slot structure, which comprises a stator core, a forming winding arranged in a stator core slot, a rotor plate and a permanent magnet fixedly arranged on the rotor plate, wherein the stator core is provided with a stator core; the two ends of the stator core are of half tooth slot structures, and each half tooth slot structure comprises side end half teeth and side end half slots; the stator core is characterized in that the middle of the stator core is of a full-tooth groove structure, the full-tooth groove structure is formed by arranging full teeth and full grooves at equal intervals, and the half-tooth groove structure and the full-tooth groove structure are integrally designed. According to the utility model, the half tooth slot structures are arranged at the two ends of the stator core, so that the positioning force of the motor is obviously reduced, the motor efficiency is improved, the iron core materials are saved, the optimization of the motor performance is realized, and the motor is suitable for more different application scenes.

Description

Permanent magnet synchronous linear motor based on stator double-sided half-tooth slot structure

Technical Field

The utility model relates to the field of permanent magnet synchronous linear motors, in particular to a permanent magnet synchronous linear motor based on a stator double-sided half-tooth slot structure.

Background

A permanent magnet synchronous linear motor (PERMANENT MAGNET LINEAR Synchronous Motor, PMLSM) is a linear motion motor, typically consisting of a stationary part and a moving part, typically the armature winding side is called primary, the permanent magnet side is called secondary, and depending on the moving parts, may also be called mover and stator. The fixed part includes a permanent magnet and the moving part includes a coil. Permanent magnet synchronous linear motors are widely used in various industrial applications, such as numerical control machine tools, semiconductor devices, and automated production lines.

The end effect of the permanent magnet synchronous linear motor refers to the end force influence caused by uneven distribution of electromagnetic force during the working process of the linear motor. In a linear motor, the generation and action of the magnetic field is accomplished by the interaction between a magnet fixed to one side of the motor and a coil on a movable part of the motor, such as a slider. The ends of the motor are subjected to greater magnetic field forces due to non-uniformity of the magnetic field distribution, causing some adverse effects. The stator core in the existing permanent magnet synchronous linear motor is of a full-tooth groove structure, namely the teeth and the grooves of the stator core are all of equal width, and only a single-layer forming winding can be arranged, and the specific structure is shown in fig. 2 and 3. The motor with the structure has some limitations in the operation process, limits the magnetic flux density, can possibly cause the problems of hysteresis loss, eddy current loss and the like, influences the efficiency and the stability of the motor, and limits the further application and development of the motor with the traditional full-tooth-slot structure.

Disclosure of Invention

The utility model provides a permanent magnet synchronous linear motor based on a stator double-sided single-sided slot structure, and aims to reduce manufacturing cost and loss while maintaining high reasoning density.

In order to achieve the above purpose, the present utility model provides the following technical solutions: a permanent magnet synchronous linear motor based on a stator double-sided half-tooth slot structure comprises a stator core, a forming winding arranged in a stator core slot, a rotor plate and a permanent magnet fixedly arranged on the rotor plate;

The two ends of the stator core are of half tooth slot structures, and each half tooth slot structure comprises side end half teeth and side end half slots;

The middle of the stator core is of a full-tooth groove structure, the full-tooth groove structure is formed by arranging full teeth and full grooves at equal intervals, and the half-tooth groove structure and the full-tooth groove structure are integrally designed; the width of the side half teeth is smaller than that of the full teeth, and the width of the side half grooves is smaller than that of the full grooves.

Further, the half tooth groove structure is composed of a right half tooth and a right half groove, or is composed of a left half tooth and a left half groove.

Further, the permanent magnet is made of neodymium iron boron materials through sintering and is arranged on the surface of the rotor flat plate.

Further, the forming winding is wound and fixed in a mould forming mode by adopting at least two enamelled wires and is connected to a driving circuit.

Further, the width of the full tooth is twice or more than the width of the side half tooth, the width of the full groove is twice or more than the width of the side half groove, and the groove depths of the full groove and the side half groove are the same.

Further, the formed winding is a single-layer winding or a double-layer winding, the double-layer winding is arranged in the whole slot, and the single-layer winding is arranged in the side end half slot.

The single-layer winding is wound into a single-layer coil which is orderly arranged on one side face of the tooth of the stator core, and the double-layer winding is alternately wound into two coils which are alternately arranged on two side faces of the tooth. The double-layer winding can effectively reduce the harmonic wave of the motor and improve the efficiency and control performance of the motor. The single-layer winding has simple structure and low manufacturing cost, but is easy to generate harmonic waves in a motor with high power and high rotating speed, so that the efficiency and the control performance of the motor are poor.

The utility model has the technical effects and advantages that:

1. By arranging the half tooth slot structures on the two sides of the stator core, the positioning force of the motor can be obviously reduced, the efficiency of the motor is improved, and the materials for the core are saved;

2. As the width of the edge teeth is reduced, the magnetic flux density of the edge teeth is denser along with the increase of the electric field input, and the size of the motor body can be greatly shortened under the condition of not influencing the electromagnetic thrust;

3. Through the adjustment of the width and the depth of the tooth slot, the motor performance can be optimized, so that the motor is suitable for more different application scenes.

4. The stator core is provided with double-layer windings in the whole slots, and single-layer windings in half slots at the side ends. Therefore, the harmonic wave of the motor can be effectively reduced, and the efficiency and the control performance of the motor are improved.

Drawings

Fig. 1 is a schematic structural diagram of a permanent magnet synchronous linear motor according to the present utility model;

Fig. 2 is a schematic diagram of a full-slot structure of a conventional stator core;

FIG. 3 is a schematic diagram illustrating the stator core and the molded winding of FIG. 2;

FIG. 4 is a schematic diagram of a half slot structure of a stator core according to the present utility model;

FIG. 5 is a schematic diagram illustrating the cooperation between the stator core and the molded winding in FIG. 4;

FIG. 6 is a graph showing the tooth magnetic flux density values of the stator core of the present utility model;

Fig. 7 is a graph showing the tooth magnetic flux density value of a conventional stator core.

In the figure: 1. a stator core; 2. right half tooth; 3. a right half groove; 4. full teeth; 5. a permanent magnet; 6. a mover plate; 7. a full groove; 8. a left half groove; 9. left half tooth; 10. and forming the winding.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Referring to fig. 1 and 3, the permanent magnet synchronous linear motor based on the double-sided half-tooth slot structure of the present utility model includes a stator core 1, wherein the stator core 1 is formed by laminating silicon steel sheets, the middle is a full-tooth slot structure, the full-tooth slot structure is formed by distributing full teeth 4 and full slots 7 at intervals, two ends of the full-tooth slot structure are respectively provided with a half-tooth slot structure, the half-tooth slot structure includes side half teeth and side half slots, the widths of the teeth and slots at the end are reduced to about half of the original size, and the double-sided half-tooth slot structure and the full-tooth slot structure are integrally formed. As shown in fig. 4, a half tooth groove structure is respectively arranged at two ends of the full tooth groove structure, wherein the half tooth groove structure at the right end consists of a right half tooth 2 and a right half groove 3, and the half tooth groove structure at the left end consists of a left half tooth 9 and a left half groove 8.

Wherein the width of the full teeth 4 is twice or more than the width of the side half teeth, the width of the full groove 7 is twice or more than the width of the side half groove, and the groove depths of the full groove 7 and the side half groove are the same.

As shown in fig. 2 and 3, the structure of the existing stator core is shown, wherein the teeth and the slots are all teeth 4 and all slots 7 with equal width and are arranged at equal intervals, and the formed winding 10 with a single layer is arranged.

As shown in fig. 4 and 5, the stator core with a half-tooth slot structure in the present application is a full-tooth slot structure formed by equally spacing full teeth and full slots, and two half-tooth slot structures are respectively arranged at two ends of the full-tooth slot structure. The formed winding 10 is a double-layer winding in the full slot of the full-slot structure, and a single-layer winding in the side half slot of the half-slot structure. The magnetic flux density of the stator core can be increased along with the reduction of the side half-tooth part in operation.

Experiments are carried out on the double-sided half-tooth-slot structure and the existing permanent magnet synchronous linear motor with the full-tooth-slot structure respectively. That is, under the rated working condition, the magnetic flux density value of the tooth structure on the stator core is collected in the same period, as shown in fig. 6 and 7. Experimental data show that the magnetic flux density of the side half teeth of the stator core with the half tooth slot structure is improved by 77.1% -83.9% compared with that of the stator core with the full tooth slot structure. Through the structure, the cogging effect of the motor can be reduced, the power density of the motor can be improved, and meanwhile, the noise of the motor can be reduced.

Referring to fig. 1 or fig. 4, the half-tooth groove structure is two butt-joint parts, wherein the half-tooth groove structure at the right end is formed by a right half tooth 2 and a right half groove 3, and the half-tooth groove structure at the left end is formed by a left half tooth 9 and a left half groove 8. The full teeth 4 and the full grooves 7 keep the original size, are of a full tooth groove structure, the width and the depth of the full tooth groove structure can be adjusted according to actual needs, and the permanent magnets 5 are regularly arranged and adhered to the surface of the rotor flat plate 6.

The permanent magnet 5 is made of permanent magnet materials such as neodymium iron boron and the like, is arranged on the surface of the rotor flat plate 6 according to requirements, and generates thrust by the interaction of the magnetic field of the stator and the magnetic field of the permanent magnet in the running process of the motor. The molded winding 10 is wound by a mold, so that complex processes caused by wire embedding and wire arrangement are greatly reduced, and the winding is distributed in the stator core slot.

In an embodiment, specific parameters of the motor are as follows: the stator core 1 is formed by laminating silicon steel sheets and riveting, the thickness of a single sheet is 0.35mm, the total thickness of the laminated sheet is 64mm, the total height of the laminated sheet is 43mm, a formed winding 10 is formed by winding and fixing a plurality of strands of enamelled wires in a mold forming mode, the wire diameter is 1.25mm, a permanent magnet 5 is made of sintered neodymium iron boron materials, the thickness of the laminated sheet is 5mm, the widths of two-sided half teeth 2 and 9 are 3.5mm, the width of a full tooth 4 is 7.66mm, the widths of two-sided half grooves 3 and 8 are 4.5mm, the groove depth is 35mm, the width of the full groove 7 is 9mm, the groove depth is 35mm, and the thickness of a rotor flat plate 6 is 8mm.

Referring to fig. 5, the forming winding 10 adopts a double-layer winding in the full-tooth slot structure of the stator core, and two coils which are arranged alternately and interpenetrated are wound on two side surfaces of the full tooth; a single-layer winding layer is adopted in a half tooth slot structure at the end part, then the single-layer winding layer is placed in each slot of a stator core and connected to a driving circuit, the driving circuit generates three-phase current, and the current can generate traveling wave magnetic fields in the winding and the excitation magnetic fields generated by the permanent magnets to interact to generate electromagnetic thrust. The double-layer winding can effectively reduce the harmonic wave of the motor and improve the efficiency and control performance of the motor.

The working principle of the utility model is as follows: when the stator core 1 is used, a high-permeability silicon steel sheet is adopted, a double-sided half-tooth-slot structure and a middle full-tooth-slot structure are integrally formed, a forming winding 10 is wound by a die, the forming winding 10 is respectively arranged in slots of the stator core 1, a permanent magnet 5 is composed of permanent magnet materials such as neodymium iron boron and the like and is fixed on the surface of a rotor flat plate 6, and in the running process of a motor, the magnetic field of the stator interacts with the magnetic field of the permanent magnet to generate thrust; the shaped winding 10 may comprise one or more groups of distributed windings, the shaped winding 10 being placed in slots of the stator core 1 and being connected to a drive circuit, which generates a three-phase current that will produce a travelling wave magnetic field in the winding that interacts with the excitation magnetic field produced by the permanent magnets, producing an electromagnetic thrust.

The above embodiments are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.

Claims (5)

1. The permanent magnet synchronous linear motor based on the stator double-sided half-tooth slot structure is characterized by comprising a stator core (1), a forming winding (10) arranged in the stator core (1), a rotor flat plate (6) and a permanent magnet (5) fixedly arranged on the rotor flat plate (6);

Both ends of the stator core (1) are of a half-tooth groove structure, and the half-tooth groove structure comprises side-end half-teeth and side-end half-grooves;

The middle of the stator core (1) is of a full-tooth-slot structure, the full-tooth-slot structure is formed by arranging full teeth (4) and full slots (7) at equal intervals, and the half-tooth-slot structure and the full-tooth-slot structure are of an integrated design; the width of the side half teeth is smaller than that of the full teeth (4), and the width of the side half grooves is smaller than that of the full grooves (7).

2. The permanent magnet synchronous linear motor based on the stator double-sided half-tooth groove structure according to claim 1, wherein the half-tooth groove structure is composed of a right half tooth (2) and a right half groove (3) or is composed of a left half tooth (9) and a left half groove (8).

3. The permanent magnet synchronous linear motor based on the stator double-sided half-tooth slot structure according to claim 1, wherein the width of the full tooth (4) is twice or more than the width of the side half-tooth, the width of the full slot (7) is twice or more than the width of the side half-slot, and the slot depths of the full slot (7) and the side half-slot are the same.

4. The permanent magnet synchronous linear motor based on the stator double-sided half-tooth slot structure according to claim 1, wherein the forming winding (10) is connected with a driving circuit.

5. The permanent magnet synchronous linear motor based on the stator double-sided half-tooth slot structure according to claim 1, wherein the forming winding (10) is a single-layer winding or a double-layer winding, the full slot (7) is internally provided with the double-layer winding, and the side end half slot is internally provided with the single-layer winding.