CN104113150A - Combined type multi-tooth stator iron hybrid field switch flux motor - Google Patents

Abstract

The invention relates to a combined multi-tooth stator core hybrid excitation switch flux motor, which is characterized in that it comprises: a stator core tooth module, a stator core yoke module, a rotor core, an armature winding, a magnetic steel, an excitation winding and the like. The stator core tooth module is configured as a multi-teeth structure, and the magnetic steel, field winding and armature winding are arranged on the stator core tooth module. The stator core tooth module and the stator core yoke module are combined sequentially along the circumferential direction to form the stator of the switched flux motor, and the rotor of the switched flux motor is only provided with a rotor core. The multi-tooth structure can reduce the output torque ripple of the motor. By controlling the direction and amplitude of the input current of the excitation winding, it can adjust the motor's overload and field-weakening speed-up capability, and it is equipped with a coolant circulation system to uniformly cool and dissipate the motor. The stability and robustness of the motor give it significant advantages in the application of electromechanical equipment in the field of servo direct drive.

Description

A Combined Multi-tooth Stator Core Hybrid Excitation Switched Flux Motor

technical field

The invention belongs to the field of servo direct drive motors for electromechanical equipment, in particular to a combined multi-tooth stator core hybrid excitation switch flux motor.

Background technique

The direct drive of modern electromechanical equipment using AC servo motor can effectively improve the working efficiency and operation accuracy of the equipment. The existing AC servo motor is generally designed as a rotor permanent magnet motor structure. Long-term load operation and vibration environment are easy to cause damage, and the heat generated by the eddy current in the magnet is difficult to dissipate, which is easy to cause irreversible demagnetization of the magnet. The switched flux motor is a permanent magnet motor in which the magnetic steel is installed on the motor stator. The motor rotor only has a magnetic core, and the structure is very robust. The magnetic steel and armature windings on the motor stator The generated heat can be dissipated by designing the cooling system to improve the overload capacity of the motor. But at the same time, the existing switched flux motors have problems such as winding winding difficulties, large output torque fluctuations, and difficult adjustment of the excitation magnetic field, which make it difficult to apply them to servo direct drive of electromechanical equipment.

In view of the above technical problems, it is necessary to provide a new type of switched flux motor that can overcome the above defects, which can be used for servo direct drive of electromechanical equipment, and improve the operation stability and robustness of electromechanical equipment.

Contents of the invention

In view of the above situation, in order to overcome the defects of the prior art, the object of the present invention is to propose a combined multi-tooth stator core hybrid excitation switched flux motor, and the output torque fluctuation of the switched flux motor is greatly reduced by designing the multi-tooth core; The combined stator core structure is designed to facilitate the winding installation of the armature winding; the excitation winding is set to effectively improve the motor's overload capability and field-weakening speed-up capability.

To achieve the above object, the present invention adopts the following technical solutions:

A combined multi-tooth stator core hybrid excitation switched flux motor, comprising a switched flux stator, a rotor core, and a motor shaft, wherein the motor shaft is placed on the central axis of the rotor core, and the rotor core is located on the On the central axis of the switching flux stator; the switching flux stator includes a stator core tooth module, a stator core yoke module, an armature winding, a magnetic steel and an excitation winding; the stator core tooth module is a multi-convex tooth type The structure is made of laminated silicon steel sheets. On the central axis of the stator core tooth module, there is a slot for accommodating the magnetic steel. The two sides of the slot are symmetrically provided with tooth slots and convex teeth; the magnetic steel is installed on the In the slot, the excitation winding is nested on the tooth slot, the armature winding is a concentrated winding structure, and the ring is wrapped around the root of the stator core tooth module; the stator core yoke module is The circular arc structure is made of laminated silicon steel sheets. The two ends of the stator core yoke module are respectively provided with L-shaped concave parts, and the roots of the stator core tooth module are correspondingly provided with convex parts. When assembling, The convex part of the stator core tooth module is just stuck in the concave part of the stator core yoke module to achieve positioning and fixing; the magnetic steel is magnetized along the circumferential direction, and the magnetic steel adjacent to the circumferential direction is magnetized in the opposite direction, and the armature The winding directions of the windings are consistent, and the three-phase windings of A, B, and C are arranged in sequence along the circumferential direction, and the winding directions of the excitation windings are consistent; the stator core tooth module and the stator core yoke module are sequentially combined and arranged along the circumferential direction It is installed inside the magnetic isolation aluminum sleeve and fixed axially by the end cover of the aluminum sleeve; the rotor core is a sleeve structure with convex teeth, which is a switch flux motor rotor, and is sleeved on the motor shaft.

The combined multi-tooth stator core hybrid excitation switch flux motor is supported by the motor base, the inner wall of the motor base is provided with through-holes for winding incoming and outgoing wires, and the outer circumference of the motor base is arranged with axial coolant pipes; The two axial ends of the motor base are provided with end covers, and one side of the end cover is provided with a cooling liquid flow chamber along the circumferential direction, and the cooling liquid flow chamber is connected with two adjacent cooling liquid pipes along the circumferential direction.

The axial ends of the motor shaft are respectively provided with bearings, and the bearings are respectively connected with the end cover and the motor frame.

The combined multi-tooth stator core hybrid excitation switch flux motor of the present invention has at least the following advantages: the present invention weakens the output torque ripple of the motor through the design of the multi-tooth stator core, and makes the motor assembly convenient and simple through the design of the combined stator structure; Set the excitation winding, change the motor magnetic field, and improve the motor overload and field-weakening speed-up capabilities. In addition, the present invention inherits the structure in which the magnetic steel of the traditional switched flux motor is installed on the stator, and through the design of the cooling fluid circulation system, the magnetic steel, the armature winding and the excitation winding are easy to dissipate heat, and the stability and robustness of the motor are improved. . Therefore, compared with the existing AC servo motor, the motor of the present invention has more advantages and better adaptability as a servo direct drive power source for electromechanical equipment.

Description of drawings

Fig. 1 is a schematic diagram of the topology of a combined multi-tooth stator core hybrid excitation switched flux motor of the present invention;

Fig. 2 is a schematic structural diagram of the stator core tooth module in Fig. 1;

Fig. 3 is a schematic structural diagram of the stator core yoke module;

Fig. 4 is a schematic diagram of a three-dimensional structure of a stator core tooth module in Fig. 1;

Fig. 5 is a three-dimensional structure schematic diagram of the stator part of the combined multi-tooth stator core hybrid excitation switch flux motor of the present invention;

Fig. 6 is a three-dimensional structure schematic diagram of the rotor part of the combined multi-tooth stator core hybrid excitation switched flux motor of the present invention;

Fig. 7 is a structural schematic diagram of the motor base of the combined multi-tooth stator core hybrid excitation switch flux motor of the present invention;

Fig. 8 is a structural schematic diagram of the motor end cover of the combined multi-tooth stator core hybrid excitation switch flux motor of the present invention;

Fig. 9 is a schematic diagram of the overall axial expansion structure of the combined multi-tooth stator core hybrid excitation switched flux motor of the present invention;

Fig. 10 is a schematic diagram of the topology of a conventional switched flux motor;

Fig. 11 is a torque output waveform diagram within one pole pitch of the motor of the present invention and the traditional switched flux motor;

Fig. 12 is a waveform diagram of excitation turn linkage flux of the motor of the present invention under different conditions.

Detailed ways

The composition structure and electromagnetic performance of a combined multi-tooth stator core hybrid excitation switching flux motor of the present invention will be specifically introduced below in conjunction with the accompanying drawings:

Referring to Fig. 1, a combined multi-tooth stator core hybrid excitation switch flux motor of the present invention mainly consists of a stator core tooth module 1, a stator core yoke module 2, a rotor core 3, an armature winding 4, and a magnetic steel 5. Composition of field winding 6, motor base 7, magnetic isolation aluminum sleeve 9, aluminum sleeve end cover 10, motor shaft 12, etc.

As shown in FIG. 1 and FIG. 2, the stator core tooth module 1 is a multi-tooth structure, and its center is coaxially provided with a slot 21, and the two sides of the slot are symmetrically provided with tooth slots 31, and the slots 31 is formed by the space between adjacent stacks of protruding teeth 41 , and the stator core teeth module 1 is made of a single silicon steel sheet which is punched or wire cut and then laminated one by one.

As shown in Fig. 1, Fig. 2 and Fig. 4, the magnetic steel 5 is installed in the inter-slot 21, the excitation winding 6 is nested on the tooth slot 31, and the armature winding 4 is a concentrated winding structure, the ring is set at the root of the stator core tooth module 1.

As shown in FIG. 1 and FIG. 3 , the stator core yoke module 2 is arranged in a circular arc structure, which is formed by lamination of single silicon steel sheets after punching or wire cutting. The two ends of the stator core yoke module 2 are provided with L-shaped recesses, so that the two ends of the stator core yoke module 2 form flanges, and the corresponding positions of the stator core tooth module 1 are provided with convex parts. When the root of the stator core tooth module 1 and the stator core yoke module 2 are assembled together, the convex part of the root of the stator core tooth module 1 is just caught in the concave part of the stator core yoke module 2 .

As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5, the magnetic steel 5, the field winding 6 and the armature winding 4 are sequentially installed in the stator core tooth module 1 to form an independent module, This module and the stator core yoke module 2 are sequentially combined and arranged on the inner side of the magnetic isolation aluminum sleeve 9 along the circumferential direction, and are axially fixed by the aluminum sleeve end cover 10 .

The stator core tooth module 1, the stator core yoke module 2, the armature winding 4, the magnetic steel 5 and the field winding 6 form a switched flux motor stator 11, the magnetic steel 5 is magnetized along the circumferential direction, and the circumferentially adjacent magnetic steel 5. The direction of magnetization is opposite, and the winding direction of the armature winding 4 is the same, and the three-phase windings of A, B, and C are sequentially arranged along the circumferential direction. The winding direction of the excitation winding 6 is the same. The different requirements change the direction and magnitude of the input current. The rotor core 3 is a sleeve structure with convex teeth, which is a switch flux motor rotor, and is sleeved on the motor shaft 12 .

As shown in FIG. 1 and FIG. 6 , the rotor core 3 is a sleeve structure with convex teeth, and is a switch flux motor rotor, which is sleeved on the motor shaft 12 .

As shown in FIG. 7 and FIG. 8 , an axial coolant pipe 71 is arranged on the outer circumference of the motor frame 7 , and a through hole 72 for winding incoming and outgoing wires is provided on the inner wall of the motor frame 7 . The motor base 7 is provided with end covers 8 at both ends in the axial direction, and one side of the end cover 8 is provided with a cooling liquid flow cavity 81 along the circumferential direction, and the cooling liquid flow cavity 81 is circumferentially adjacent to two The coolant pipes 71 are connected to form a coolant circulation system as a whole.

As shown in FIG. 5, FIG. 6 and FIG. 9, the switch flux stator 11 is placed in the motor frame 7 by installing a magnetic isolation aluminum sleeve 9, and the rotor core 3 is arranged on the switch through the motor shaft 12. In the magnetic flux stator 11 , bearings 13 are arranged at both axial ends of the motor shaft 12 , and the front and rear bearings 13 are respectively connected with the end cover 8 and the motor frame 7 .

Referring again to Fig. 1, as a preferred embodiment of the present invention, six stator core tooth modules 1 are placed on the inner side of the magnetic isolation aluminum sleeve 9 along the circumferential direction, and each stator core tooth module 1 is correspondingly provided with four A convex tooth 41, a magnetic steel 5, a centralized armature winding 4, and an excitation winding 6, correspondingly set the optimal number of convex teeth on the rotor core to be 19. According to application requirements, the number of stator core tooth modules can be set to a multiple of 6, the number of 41 convex teeth can be set to 4 or 6, and the number of convex teeth that best corresponds to the rotor core 3 can be selected.

Referring to Fig. 10, it is a topology structure of a traditional switched flux motor, which is mainly composed of a stator core tooth module 1 corresponding to the motor of the present invention in Fig. 1, an armature winding 4, a magnetic steel 5 and a rotor core 3. The commonly used stator and rotor tooth pole combination structure is 12 stator cores corresponding to 10 rotor cores. Compared with the present invention, the difference in topological structure lies in that the stator core module of the motor of the present invention is a multi-tooth structure. Using finite element simulation analysis, under the same external dimensions, compare the output torque waveforms of the motor of the present invention and the traditional switched flux motor at one pole pitch, as shown in Figure 11, it can be seen that, compared with the traditional switched flux motor, this The invented multi-tooth stator core switched flux motor has less pulsation in the output torque and is more ideal as a direct drive source for electromechanical equipment. At the same time, as shown in Figure 4, the present invention uses a combined stator core structure to enable the armature winding 6 to be directly fitted onto the stator core tooth module 1 after being integrally wound by a winding die. The assembly is simple and convenient, overcoming many Difficulty in winding the tooth core stator.

Referring to Fig. 12, the adjustment performance of the excitation winding 6 to the magnetic field of the motor of the present invention is studied by means of finite element simulation analysis. The main magnetic field of the motor of the present invention is composed of the magnetic steel 5 and the excitation winding 6 to form a hybrid excitation magnetic field, which belongs to a hybrid excitation motor. The armature winding 4 generates a turn chain induction magnetic flux under the mixed excitation magnetic field. When the field winding 6 does not pass current, the electromagnetic field is completely generated by the magnetic steel 5, and the flux linkage of the 4 turns of the armature winding is the rated no-load flux linkage in Fig. Under the condition of constant electromagnetic parameters, the greater the amplitude of the turn chain, the greater the output torque of the motor and the stronger the load capacity. Therefore, passing a direct current with a certain direction and amplitude to the field winding 6 can increase the flux linkage amplitude of the armature winding 4 and improve the load overload capacity of the motor, as shown in the overload magnetization described in Figure 12 magnetic link. On the other hand, when a direct current in the direction opposite to the magnetizing flux linkage is passed into the field winding 6, the amplitude of the turn-link flux linkage of the armature winding 4 is reduced, and when the input rated current of the armature winding remains unchanged, The output torque of the motor is reduced, the output speed of the motor is increased, the effect of magnetic field weakening and speed increase is achieved, and the speed regulation range of the motor can be improved. As shown in Figure 12, the excitation winding 6 has a significant adjustment effect on the flux linkage amplitude, thereby greatly expanding the overload range and speed regulation range of the motor of the present invention, which has a significant effect on the servo direct drive of electromechanical equipment. superiority.

The above is only one embodiment of the present invention, not all or the only embodiment. Any equivalent transformation of the technical solution of the present invention adopted by those of ordinary skill in the art by reading the description of the present invention is the right of the present invention. covered by the requirements.

Claims (3)

1. the multiple tooth stator core hybrid excitation switched flux motor of composite type, it is characterized in that: comprise switch magnetic flow stator (11), rotor core (3), and motor shaft (12), wherein, described motor shaft is placed on the central shaft of rotor core, and described rotor core (3) is positioned on the central shaft of described switch magnetic flow stator (11); Described switch magnetic flow stator (11) comprises stator core tooth portion module (1), stator core yoke portion module (2), armature winding (4), magnet steel (5) and excitation winding (6); Described stator core tooth portion's module (1) is many double wedges formula structure, by silicon steel plate stacking, formed, on the central axis of this stator core tooth portion module (1), offer hold magnet steel (5) between groove (21), the bilateral symmetry of this groove (21) is provided with teeth groove (31) and double wedge (41); Described magnet steel (5) be arranged on described between in groove (21), described excitation winding (6) is nested on described teeth groove (31), described armature winding (4) is for concentrating winding construction, and ring set is at described stator core tooth portion module (1) root of stating;

Described stator core yoke portion's module (2) is arc structure, by silicon steel plate stacking, formed, two ends of described stator core yoke portion's module (2) offer respectively L shaped recess, the root correspondence of described stator core tooth portion's module (1) is provided with protuberance, during assembling, the protuberance of described stator core tooth portion's module (1) be just stuck in described stator core yoke portion's module (2) thus recess in to realize location fixing;

Described magnet steel (5) is along circumferentially magnetizing, and circumferentially adjacent magnet steel (5) magnetizing direction is contrary, and described armature winding (4) direction of winding is consistent, along circumferentially setting gradually as A, and B, C tri-phase windings, described excitation winding (6) direction of winding is consistent;

Described stator core tooth portion's module (1) and stator core yoke portion module (2) along circumferentially successively combined discharging in described installation every magnetic aluminium cover (9) inner side, and by described aluminium cover end cap (10) axial restraint;

Described rotor core (3), for band double wedge tube-in-tube structure, is switch magnetic flow rotor, is sleeved on described motor shaft (12).

2. the multiple tooth stator core hybrid excitation switched flux motor of a kind of composite type according to claim 1, it is characterized in that: the multiple tooth stator core hybrid excitation switched flux motor of described composite type is supported by motor base (7), described electric machine stand (7) inwall is provided with winding line through hole (72), and described electric machine stand (7) excircle is furnished with axial coolant duct (71); Described electric machine stand (7) is axially provided with end cap (8) in two ends, described end cap one side outer is circumferentially provided with coolant flow chamber (81), and described coolant flow chamber (81) is along being circumferentially connected with adjacent two coolant ducts (71).

3. the multiple tooth stator core hybrid excitation switched flux motor of a kind of composite type according to claim 1, it is characterized in that: described motor shaft (12) is axially respectively arranged with bearing (13) in two ends, and described bearing (13) is connected with described electric machine stand (7) with described end cap (8) respectively.