Outer rotor type switch synchronous motor

Abstract

The utility model relates to the field of electromechanical processes, in particular to an outer rotor type switch synchronous motor which is provided with a rotating outer rotor and a fixed stator with concentrated windings, the concentrated windings are arranged on protruding stator magnetic poles, the stator magnetic poles comprise stator pole shoes with tooth structures, and a magnetic circuit of the rotor is provided with rectangular rotor teeth. The rotor teeth are arranged parallel to the longitudinal axis of the electric machine. When the teeth of the rotor are located at specific positions relative to the tooth structures of the stator pole shoes to minimize the magnetic resistance of the magnetic circuit, the torque enabling the rotor to rotate is generated. The rotational speed of the rotor and the magnitude of the torque directly depend on the switching frequency and the voltage value of the voltage applied to the stator winding. The non-uniformity of the magnetic circuit of the rotor ensures that the torque and the rotating speed of the motor have a direct relation.

Description

Technical Field

[0001] This application relates to the field of electromechanical technology, and in particular to an external rotor type switch synchronous motor. Background Technology

[0002] A reluctance motor is a continuously operating electrical energy conversion device whose structure and operating principle differ significantly from ordinary AC and DC motors. The rotor's magnetic circuit has linear magnetic poles parallel to the motor shaft. When the rotor changes position relative to the stator magnetic poles to minimize the magnetic reluctance of the magnetic circuit, torque is generated, thus driving the rotor to rotate. The rotor's speed and torque magnitude directly depend on the voltage switching frequency and magnitude applied to the stator windings. The non-uniformity of the rotor's magnetic circuit ensures a direct relationship between the motor's torque and speed. However, current reluctance motors have poor torque regulation. Utility Model Content

[0003] In order to increase the torque value of the motor with the same external dimensions, this utility model provides an external rotor type switching synchronous motor.

[0004] The external rotor type switching synchronous motor provided by this utility model adopts the following technical solution:

[0005] An external rotor type switching synchronous motor includes a stator laminar core, the stator laminar core having a plurality of stator magnetic poles with stator pole shoes and spaced apart; the stator magnetic poles with stator pole shoes include tooth structures integrally formed therewith; the stator magnetic poles with stator pole shoes are distributed on the outer periphery of the stator laminar core and connected to the stator laminar core;

[0006] Stator winding coils, which are wound around each stator pole with a stator pole shoe; and

[0007] The rotor laminar core surrounds the outside of the stator laminar core. The rotor laminar core is connected to a plurality of spaced rectangular rotor teeth. These rectangular rotor teeth are located on the inside of the rotor laminar core and form an integral structure with the rotor laminar core.

[0008] Preferably, there is an air gap between the stator laminated core and the rotor laminated core.

[0009] Preferably, the number of stator magnetic poles is 8, and each stator magnetic pole is provided with two tooth structures.

[0010] By adopting the above technical solutions, the operating efficiency of motors driven by the same current can be improved.

[0011] Preferably, the rotor has 22 teeth.

[0012] By adopting the above technical solution, the operating efficiency of the motor can be improved under the same current drive.

[0013] Preferably, a stator winding coil made of copper wire is used, which is wound in two layers, with the second layer wound around the top of the stator magnetic pole near the tooth structure.

[0014] By adopting the above technical solution, not only is the efficiency of the motor improved, but the space between the magnetic poles can also be filled more effectively with coils, thereby reducing the electrical loss in the magnetic pole winding by 50%.

[0015] In summary, this utility model has the following beneficial effects:

[0016] Compared to statorless synchronous reluctance motors, this design simplifies the stator winding manufacturing process, makes better use of the stator slot space for winding arrangement, and reduces the number of stator poles and stator winding coils. Rapid rotor braking can be achieved by applying a reverse voltage to the stator windings, and effective motor cooling is achieved through the airflow generated by the externally rotating rotor. Furthermore, the absence of permanent magnets in this motor structure significantly reduces costs and allows it to operate at higher temperatures. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this application.

[0018] Figure 2 It shows the positional relationship between the stator core and the rotor core.

[0019] Figure 3 This is a cross-sectional view of the overall structure of this application.

[0020] Figure 4 This is a schematic diagram of the direction of magnetic flux flow in this application.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Rotor laminated iron core; 2. Stator laminated iron core; 3. Stator magnetic pole; 4. Stator pole shoe; 5. Rotor tooth; 6. Tooth structure; 7. Stator winding coil; 8. Stator hub; 9. Air gap; 10. Rotor magnetic circuit; 11. Stator magnetic circuit; 12. Fixed shaft; 13. Rotor ring; 14. Rim; 15. End cover; 16. Bearing assembly. Detailed Implementation

[0023] The following combination Figures 1-4 This application will be described in further detail.

[0024] An external rotor type switching synchronous motor, referenced Figures 1-4The motor includes a fixed shaft 12, a stator fixedly connected to the outer peripheral wall of the fixed shaft 12, and a rotor that rotates around the stator. The rotor includes a rotor lamination core 1 and rectangular rotor teeth 5. The number of rotor teeth 5 is 22, and they are evenly distributed on the inner side of the rotor lamination core 1. The rotor teeth 5 are integrally formed with the rotor lamination core 1.

[0025] The stator includes a stator laminated iron core 2, with stator poles 3 evenly distributed around its outer periphery. Each stator pole 3 has a stator pole shoe 4. The ends of the stator poles 3 are provided with tooth structures 6. There are eight stator poles 3, each with two tooth structures 6, and the tooth structures 6 are integrally formed with the stator pole 3. An air gap 9 exists between the rotor and the stator.

[0026] Reference Figure 2 The motor also includes a stator winding coil 7 made of copper wire wound into a conical shape. The stator winding coil 7 is wound around the stator magnetic pole 3 and is wound in two layers, with the second layer located at the top of the stator magnetic pole 3 near the tooth structure 6. The magnetic field generated by the stator winding coil 7 forms the stator magnetic circuit 11 through the stator laminated iron core 2.

[0027] Reference Figure 2 The motor also includes a stator hub 8, which is fixedly connected to a fixed shaft 12.

[0028] Reference Figure 3 The motor also includes a rotor ring 13 and a rim 14, with the rotor ring 13 surrounding the rotor and the rim 14 fixedly connected to the rotor ring 13. In this embodiment, the rotor ring 13 serves as a shield to protect the outer periphery of the rotor magnetic circuit 10.

[0029] Reference Figure 1 and Figure 3 The motor also includes two end caps 15, which are respectively located on both sides of the rotor. The outer edge of each end cap 15 is fixedly connected to the rotor ring 13. The fixed shaft 12 is rotatably connected to the end caps 15 through a bearing assembly 16, which allows the fixed shaft 12 to rotate freely between the two opposing end caps 15.

[0030] In this embodiment, the two end caps 15 interact with the rotor ring 13 to form a closed chamber, in which both the stator and the rotor are located, and the chamber serves as a shield for protection.

[0031] In this embodiment, the two end caps 15 serve as shielding protection devices on both sides of the stator and rotor.

[0032] The operating principle of this application is as follows: Due to the presence of rotor teeth 5 and tooth structures 6 on stator poles 3, the rotor magnetic circuit 10 has non-uniform magnetic reluctance. Furthermore, there is no need to install permanent magnets on the rotor. When a pair of stator winding coils 7 of stator poles 3 are energized, the rotor teeth 5 tend to occupy a position relative to tooth structure 6 that minimizes magnetic flux and magnetic reluctance, thus giving the motor a larger torque. Subsequently, the voltage switches to the next set of windings (stator poles 3), which are always opposite each other and 180 degrees to the rotor, thus the rotor occupies the new position. Since the winding pairs switch circumferentially, the rotor rotates synchronously in the switching direction. This switching method eliminates the need for a voltage inverter in the controller to convert DC to AC, as only DC is required, thus reducing costs. The rotor speed is closely related to the switching frequency of the voltage on the stator pole 3 winding coils. The advantage of this motor is that it does not exhibit slippage like asynchronous motors.

[0033] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. An external rotor type switching synchronous motor, characterized in that: Includes a stator lamination core (2), the stator lamination core (2) has a plurality of stator magnetic poles (3) with stator pole shoes (4) and spaced apart, the stator magnetic poles (3) with stator pole shoes (4) are distributed on the outer periphery of the stator lamination core (2) and connected to the stator lamination core (2), the end of the stator magnetic pole (3) is provided with a tooth structure (6) integrally formed therewith; Stator winding coils (7), which are wound around each of the stator poles (3) with stator pole shoes (4); and The rotor lamination core (1) surrounds the outside of the stator lamination core (2). The rotor lamination core (1) is connected with a plurality of spaced rectangular rotor teeth (5). These rectangular rotor teeth (5) are located inside the rotor lamination core (1) and form an integral structure with the rotor lamination core (1).

2. The external rotor type switching synchronous motor according to claim 1, characterized in that: The stator is composed of the stator lamination core (2), the stator magnetic pole (3) and the tooth structure (6), and the rotor lamination core (1) and the rotor teeth (5) are composed of the rotor. There is an air gap (9) between the stator and the rotor.

3. The external rotor type switching synchronous motor according to claim 1, characterized in that: The number of stator magnetic poles (3) is 8, and each stator magnetic pole (3) is provided with two tooth structures (6).

4. The external rotor type switching synchronous motor according to claim 1, characterized in that: The rotor teeth (5) number 22.

5. The external rotor type switching synchronous motor according to claim 1, characterized in that: A stator winding coil (7) made of copper wire is used, which is wound in two layers, with the second layer wound around the top of the stator pole (3) near the tooth structure (6).

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