CN107508449A - Unit motor module permanent magnetic linear synchronous motor - Google Patents

Abstract

The invention provides a unit motor modularized permanent magnet synchronous linear motor, which belongs to the technical field of motors. It consists of multiple unit motors, each unit motor includes a primary assembly and a secondary assembly. The primary assembly is composed of a primary iron core and an armature winding. The primary iron core is slotted, and the armature winding is arranged in the slot. The secondary assembly consists of permanent magnets and secondary cores. There is an air gap between the primary and secondary components. A magnetic modulation structure is arranged between two adjacent unit motors. The width of the magnetic modulation structure is S=(k+1/3)τ (k is an integer, and τ is the pole pitch of the motor). The arrangement order of the windings in the slots is different, and the winding directions of the windings on the two unit motors are opposite. The structure is beneficial to suppress the end effect, improve the asymmetry of the three-phase winding of the permanent magnet synchronous linear motor and reduce the thrust fluctuation.

Description

Unit Motor Modular Permanent Magnet Synchronous Linear Motor

technical field

The invention belongs to the field of motors, in particular to a modularized permanent magnet synchronous linear motor of a unit motor.

Background technique

The direct transmission technology based on linear motors eliminates the need for intermediate complex transmission mechanisms. It has been applied in linear motion occasions such as machine tools and elevators, and its application fields are gradually expanding to various fields of production and life. The permanent magnet synchronous linear motor has the advantages of simple and reliable structure, high thrust and thrust density, so it has broad application prospects in various high-precision linear motion control occasions. Different from the rotating motor, the iron core of the linear motor has an end, and the end effect causes the harmonic component of the magnetic field to increase, causing the positioning force and thrust fluctuation to increase. Therefore, reducing the positioning force and thrust fluctuation of the permanent magnet synchronous linear motor becomes the The problems that must be solved in the research and application of similar motors. The existing permanent magnet synchronous linear motors often use optimized end core structure to suppress thrust fluctuations, but the optimization of the end core has limited effect on the one hand, and on the other hand, it is easy to increase the length of the motor and reduce the volume and mass of the motor. increases, the thrust density decreases.

Contents of the invention

In order to solve the problem of large thrust fluctuation of the existing permanent magnet synchronous linear motor, the present invention proposes a unit motor modular permanent magnet synchronous linear motor.

Concrete technical scheme of the present invention is as follows:

The unit motor modular permanent magnet synchronous linear motor includes a unit motor 1 and a unit motor 2 2, and each unit motor includes a primary component and a secondary component. The primary assembly is composed of a primary iron core 3 and an armature winding 4. A slot 3-3 is formed on the primary iron core 3 to form a primary yoke 3-1 and a primary tooth 3-2 structure, and the armature winding 4 is arranged in the slot 3-3. The secondary assembly consists of a secondary core 5 and a permanent magnet 6 . There is an air gap 7 between the primary and secondary components. A magnetic modulation structure 8 is arranged between the unit motor one 1 and the unit motor two 2 . Adjacent unit motor one 1 and unit motor two 2 are arranged in different order of windings in the slots, unit motor one 1 is arranged from left to right, and the slots are provided with A phase winding 4-1, B phase winding 4-2, The C-phase winding 4-3, the unit motor 2 from left to right, the C-phase winding 4-4, the A-phase winding 4-5, and the B-phase winding 4-6 are arranged in sequence in the slot. The winding direction of the same-phase winding on the adjacent unit motor 1 and unit motor 2 is opposite: the winding direction of the A-phase winding 4-1 and 4-5 is opposite, and the winding direction of the B-phase winding 4-2 and 4-6 The directions are opposite, and the winding directions of the C-phase windings 4-3 and 4-4 are opposite.

A further design of the present invention is:

The magnetic modulation structure 8 is made of a magnetically permeable material and integrated with the primary iron core 3 .

Magnetic adjustment structure 8 comprises magnetic adjustment yoke part 8-1 and magnetic adjustment tooth part 8-2, and the width of magnetic adjustment yoke part 8-1 is S=(k+1/3)τ (k is an integer, and τ is the motor's pole pitch), the width S ₁ ≤ S of the magnetic adjustment tooth portion 8-2, the height h ₁ ≤ h of the magnetic adjustment tooth portion 8-2, h is the height of the core tooth 3-2 of the unit motor.

The motor can adopt n (n≥3) unit motor structures, and a magnetic modulation structure 8 is arranged between two adjacent unit motors. The setting of the upper winding of the unit motor is: A phase winding-B phase winding-C phase winding ;The setting of the second upper winding of the unit motor is: C-phase winding-A-phase winding-B-phase winding; the setting of the third upper winding of the unit motor is: B-phase winding-C-phase winding-A-phase winding; the setting of the fourth upper winding of the unit motor It is: A-phase winding-B-phase winding-C-phase winding. In turn, the cycle is performed according to the winding structure of each group of three unit motors. On any two adjacent unit motors, the winding directions of the same-phase windings are opposite.

The advantages of the present invention are:

(1) Through the design of the magnetic adjustment structure and the adjustment of the winding settings on the unit motor, on the one hand, the magnetic field distribution at the end is adjusted, and on the other hand, the relative position between each phase winding and the end is changed, thereby reducing the influence of the end effect on each phase winding , reduce the asymmetry of the three-phase windings caused by the end effect, and finally achieve the purpose of reducing the thrust fluctuation of the motor and improving the control performance of the permanent magnet synchronous linear motor system;

(2) Compared with the existing optimization design method of modular linear motor and end additional cogging, the minimum width of the set magnetic modulation structure can be 1/3τ, while suppressing the end effect, the primary The value of length increase is very small, which is beneficial to reduce the volume mass of the motor and improve the thrust density.

Description of drawings

Fig. 1 is a one-unit motor modularized permanent magnet synchronous linear motor according to an embodiment.

Figure 2 is a schematic diagram of the structure of the primary core.

Fig. 3 is a schematic diagram of the primary assembly of unit motor one.

Fig. 4 is a schematic structural diagram of the primary assembly of unit motor 2.

Fig. 5 is a schematic diagram of the magnetic modulation structure.

Fig. 6 is a three-unit motor modular permanent magnet synchronous linear motor in Embodiment 2.

In the figure, 1: unit motor one; 2: unit motor two; 3: primary iron core; 3-1: primary yoke; 3-2: primary teeth; 3-3: slot; 4: armature winding; 4-1: A-phase winding on unit motor one; 4-2: B-phase winding on unit motor one; 4-3: C-phase winding on unit motor one; 4-4: C-phase winding on unit motor two; 4-5: unit motor 2. Upper A phase winding; 4-6: Unit motor 2 upper B phase winding; 5: Secondary iron core; 6: Permanent magnet; 7: Air gap; 8: Magnetic adjustment structure; 8-1: Magnetic adjustment yoke; 8- 2: Adjusting magnetic teeth

detailed description

Below in conjunction with accompanying drawing and embodiment the present invention will be further described

Implementation mode one:

As shown in Figures 1, 2, 3, 4, and 5, the unit motor modular permanent magnet synchronous linear motor includes unit motor one 1 and unit motor two 2, and each unit motor includes a primary component and a secondary component. The primary assembly is composed of a primary iron core 3 and an armature winding 4. A slot 3-3 is formed on the primary iron core 3 to form a structure of a primary yoke 3-1 and a primary tooth 3-2. The armature winding 4 is arranged in the slot 3-3. The secondary assembly consists of a secondary core 5 and a permanent magnet 6 . There is an air gap 7 between the primary and secondary components. A magnetic modulation structure 8 is arranged between the unit motor 1 and the unit motor 2 . The magnetic modulation structure 8 is made of a magnetically permeable material and integrated with the primary iron core 3 . On the magnetic adjustment structure 8, the width of the magnetic adjustment yoke portion 8-1 is S=(k+1/3)τ (k is an integer, and τ is the pole pitch of the motor), and the width S of the magnetic adjustment tooth portion 8-2 is ₁ ≤S, the height h ₁ of the magnetic adjustment tooth portion 8-2 ≤h, h is the height of the core tooth 3-2 of the unit motor.

The setting order of the windings in the slots on unit motor one 1 and unit motor two 2 is different. On unit motor one 1, from left to right, the slots are sequentially provided with A phase winding 4-1, B phase winding 4-2, and C phase winding 4-3, from left to right on the unit motor 2, there are C-phase windings 4-4, A-phase windings 4-5, and B-phase windings 4-6 in the slots. The winding directions of the same-phase windings on unit motor one 1 and unit motor two 2 are opposite: the winding directions of A-phase winding 4-1 and 4-5 are opposite, and the winding directions of B-phase winding 4-2 and 4-6 are opposite, The winding directions of the C-phase windings 4-3 and 4-4 are opposite.

The adjustment of the magnetic field structure 8 and the adjustment of the phase sequence and winding direction of the windings on different unit motors can not only ensure that the phases of the same-phase windings on each unit motor are the same, but also adjust the influence of the end effect on the asymmetry of the phase windings, reducing the motor’s Thrust fluctuations are beneficial to the improvement of control system performance.

Implementation mode two:

As shown in FIG. 6 , the motor adopts three unit motor structures, a magnetic modulation structure 12 is set between the first unit motor 9 and the second unit motor 10 , and a magnetic modulation structure 13 is set between the second unit motor 10 and the third unit motor 11 . The phase sequence of the windings on unit motor one 9 is set according to phase A winding-phase B winding-phase C winding. The phase sequence of the windings on the unit motor 2 10 is set according to phase C winding-phase A winding-phase B winding. The phase sequence of the windings on the unit motor three 11 is set according to B-phase winding-C-phase winding-A-phase winding. On any two adjacent unit motors, the winding directions of the same-phase windings are opposite.

Claims (4)

1. Unit motor The modular permanent magnet synchronous linear motor includes unit motor one 1 and unit motor two 2, and each unit motor includes a primary component and a secondary component. The primary assembly is composed of a primary iron core 3 and an armature winding 4. A slot 3-3 is formed on the primary iron core 3 to form a primary yoke 3-1 and a primary tooth 3-2 structure, and the armature winding 4 is arranged in the slot 3-3. The secondary assembly consists of a secondary core 5 and a permanent magnet 6 . There is an air gap 7 between the primary and secondary components. A magnetic modulation structure 8 is arranged between the unit motor one 1 and the unit motor two 2 . The arrangement order of the windings in the slots on the adjacent unit motor 1 and unit motor 2 is different. On unit motor one 1, from left to right, A phase windings 4-1, B phase windings 4-2, C phase windings 4-3 are arranged in sequence in the slot, and unit motor two 2 is arranged in turn from left to right in the slots C phase winding 4-4, A phase winding 4-5, B phase winding 4-6. The winding direction of the same-phase winding on the adjacent unit motor 1 and unit motor 2 is opposite: the winding direction of the A-phase winding 4-1 and 4-5 is opposite, and the winding direction of the B-phase winding 4-2 and 4-6 The directions are opposite, and the winding directions of the C-phase windings 4-3 and 4-4 are opposite. 2 . The unit motor modularized permanent magnet synchronous linear motor according to claim 1 , characterized in that: the magnetic modulation structure 8 is made of a magnetically permeable material and integrated with the primary iron core 3 . 3. The unit motor modular permanent magnet synchronous linear motor according to claim 1, characterized in that: the magnetic adjustment structure 8 includes a magnetic adjustment yoke 8-1 and a magnetic adjustment tooth 8-2, and the magnetic adjustment yoke 8- The width of 1 is S=(k+1/3)τ (k is an integer, and τ is the pole pitch of the motor), the width S ₁ ≤ S of the magnetically regulating tooth portion 8-2, and the height of the magnetically regulating tooth portion 8-2 h ₁ ≤ h, h is the height of the iron core teeth 3-2 of the unit motor. 4. The unit motor modular permanent magnet synchronous linear motor according to claim 1, characterized in that: the motor adopts n (n≥3) unit motor structures, and a magnetic modulation structure is arranged between adjacent two unit motors 8. The setting of the upper winding of the unit motor 1 is: A phase winding-B phase winding-C phase winding; the setting of the upper winding of the unit motor 2 is: C phase winding-A phase winding-B phase winding; the setting of the third upper winding of the unit motor The setting is: B-phase winding-C-phase winding-A-phase winding; the setting of the four upper windings of the unit motor is: A-phase winding-B-phase winding-C-phase winding. In turn, the cycle is performed according to the winding structure of each group of three unit motors. On any two adjacent unit motors, the winding directions of the same-phase windings are opposite.