Birotor permanent magnet servo drive motor

Abstract

The utility model discloses a double-rotor permanent magnet servo driving motor, which comprises a motor body, a driving shaft is arranged in the motor body, a plurality of rotor parts are arranged outside the driving shaft, a stator iron core is arranged on the outer side of each rotor part, and the plurality of rotor parts share one stator iron core. The air gap magnetic flux of at least one rotor component is adjustable. In the invention, the air gap magnetic flux of the rotor component can be adjusted, the size of the air gap magnetic flux can be controlled by externally adjusting the size of the exciting current, the air gap magnetic flux density can be improved when low-speed large torque is required, the overload capacity is improved, the input current can be reduced in the high-speed stage of the motor, and even the reverse current can be introduced; therefore, the air-gap flux is reduced, the air-gap flux density is reduced, and the purpose of high-speed rotation of the motor can be achieved.

Description

Technical Field

[0001] The utility model relates to the field of motors, in particular to a dual-rotor permanent magnet servo drive motor. Background Art

[0002] An electric motor, commonly known as a motor, is an electromagnetic device that converts or transmits electrical energy according to the law of electromagnetic induction. Its main function in a circuit is to generate driving torque as a power source for electrical appliances or various machines.

[0003] The Chinese utility model patent application (publication number CN2842847, publication date: 20061129) discloses a high-power permanent magnet motor, including a rotating shaft, a rotor, and a stator. A tile-shaped magnetic steel is attached to the outer axial surface of the rotor; a plurality of through holes are provided in the rotor, which are evenly arranged along the radial direction of the rotor, and metal bars with good thermal conductivity are cast and filled in the through holes, and then the metal bars and the two end rings of the rotor are cast into a whole. The rotor end rings and the bars are made of the same metal, so the metal bars and the rotor end rings form a heat-conducting cage; at the same time, the outer surface of the tile-shaped magnetic steel of the rotor is prestressed and tightly wound with magnetic-insulating stainless steel wire, and then coated with epoxy resin to prevent oxidation. The heat dissipation effect of the high-power permanent magnet motor is more uniform and rapid, which effectively reduces the temperature rise of the permanent magnet motor and breaks through the difficulty of increasing the capacity of the permanent magnet motor. According to the test, the maximum power of the permanent magnet motor can reach 120KW. It also improves the reliability and safety of the motor operation and greatly prolongs the life of the motor.

[0004] The existing technology has the following shortcomings: the rotor of the traditional motor, whether it is an inner rotor or an outer rotor, can only achieve one stator winding driving one rotor. When the motor needs to have multiple output terminals, multiple stator windings are required to drive multiple rotors; thereby increasing the number of stator windings of the motor and the cost of the motor. In addition, some application scenarios require the motor to have a large low-speed torque and achieve 3.5 times the torque output within the speed range of low-speed applications. For this occasion, the motors currently on the market are difficult to meet and often have to be split into two motors. Utility Model Content

[0005] The main purpose of the utility model is to provide a dual-rotor permanent magnet servo drive motor, aiming to solve the above technical problems.

[0006] To achieve the above-mentioned purpose, the utility model proposes a dual-rotor permanent magnet servo drive motor including a motor body, a drive shaft is provided inside the motor body, a plurality of rotor components are provided outside the drive shaft, a stator core is provided outside the rotor component, a plurality of the rotor components share one stator core, and the air gap flux of at least one of the rotor components is adjustable.

[0007] In one embodiment, the dual-rotor permanent magnet servo drive motor further includes a front end cover disposed on the front side of the motor body.

[0008] In one embodiment, the dual-rotor permanent magnet servo drive motor further includes a rear end cover disposed at the rear side of the motor body, and the drive shaft passes through the front end cover, the motor body and the rear end cover.

[0009] In one embodiment, a bearing component is provided between the driving shaft and the motor body.

[0010] In one embodiment, at least one of the rotor components is an electrically excited coil rotor.

[0011] In one embodiment, the remaining rotor components are rare earth neodymium iron boron rotors.

[0012] In one embodiment, a wind shield is disposed at the rear side of the motor body, and a fan is disposed in the wind shield.

[0013] In one embodiment, a driver is provided on the top of the motor body.

[0014] In the technical solution of the utility model, the dual-rotor permanent magnet servo drive motor includes a motor body, a drive shaft is arranged in the motor body, a plurality of rotor parts are arranged outside the drive shaft, a stator core is arranged outside the rotor part, a plurality of the rotor parts share one stator core, and the air gap flux of at least one of the rotor parts is adjustable. Therefore, in the technical solution, since the air gap flux of the rotor part can be adjusted, the air gap flux can be controlled by adjusting the excitation current externally, and the air gap flux density can be increased when low speed and high torque are required, thereby improving the overload capacity, and the input current can be reduced in the high-speed stage of the motor, and even a reverse current can be introduced, thereby reducing the air gap flux and reducing the air gap magnetic density, so as to achieve the purpose of high-speed rotation of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of a dual-rotor permanent magnet servo drive motor according to an embodiment of the utility model.

[0017] Explanation of the accompanying drawings: 10, motor body; 20, driving shaft; 30, rotor component; 40, stator core; 50, front cover; 60, rear cover; 70, bearing component; 80, wind cover; 90, driver.

[0018] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0022] Furthermore, the technical solutions of the various embodiments of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] The utility model provides a double-rotor permanent magnet servo drive motor.

[0024] like Figure 1 As shown, the dual-rotor permanent magnet servo drive motor provided by the embodiment of the utility model includes a motor body 10, a drive shaft 20 is provided inside the motor body 10, a plurality of rotor components 30 are provided outside the drive shaft 20, a stator core 40 is provided outside the rotor component 30, a plurality of the rotor components 30 share one stator core 40, and the air gap flux of at least one of the rotor components 30 is adjustable.

[0025] In this embodiment, the dual-rotor permanent magnet servo drive motor includes a motor body 10, a drive shaft 20 is provided inside the motor body 10, a plurality of rotor parts 30 are provided outside the drive shaft 20, a stator core 40 is provided outside the rotor part 30, a plurality of the rotor parts 30 share one stator core 40, and the air gap flux of at least one of the rotor parts 30 is adjustable. Therefore, in this technical solution, since the air gap flux of the rotor part 30 can be adjusted, the air gap flux can be controlled by adjusting the excitation current externally, and the air gap flux density can be increased when low speed and high torque are required, thereby improving the overload capacity, and the input current can be reduced in the high-speed stage of the motor, and even a reverse current can be introduced, thereby reducing the air gap flux and reducing the air gap magnetic density, so as to achieve the purpose of high-speed rotation of the motor.

[0026] In an optional embodiment, the number of rotor components 30 is two, and one of the rotor components 30 is a rare earth Ni-Fe-B rotor that can generate a fixed air gap flux, and the other rotor component 30 is an electric excitation coil rotor, and the size of the air gap flux can be controlled by adjusting the excitation current from the outside. Therefore, when low speed and high torque are required, the air gap flux density can be increased, thereby improving the overload capacity; in the high-speed stage of the motor, the input current can be reduced, and even a reverse current can be introduced, thereby reducing the air gap flux and reducing the air gap flux density, so as to achieve the purpose of high-speed rotation of the motor.

[0027] Of course, in other embodiments, the number of rotor components 30 may be greater than two, and at least one rotor component 30 is an electric excitation coil rotor whose air gap magnetic flux can be controlled by adjusting the excitation current from the outside.

[0028] In the present application, the dual-rotor permanent magnet servo drive motor further includes a front end cover 50 disposed on the front side of the motor body 10. The dual-rotor permanent magnet servo drive motor further includes a rear end cover 60 disposed on the rear side of the motor body 10, and the drive shaft 20 passes through the front end cover 50, the motor body 10 and the rear end cover 60. The drive motor is sealed by the front end cover 50 and the rear end cover 60 to improve the sealing performance.

[0029] In addition, a bearing component 70 is provided between the driving shaft 20 and the motor body 10 to improve the smoothness of the driving shaft 20 during rotation.

[0030] At the same time, a fan 80 is provided at the rear side of the motor body 10, a fan is provided in the fan 80, and a driver 90 is provided at the top of the motor body 10. In the present application, the stator core 40, the driver 90, the fan and the encoder provided on the motor body 10 are all common parts, which can effectively reduce material input and reduce investment cost.

[0031] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the concept of the utility model, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A dual-rotor permanent magnet servo drive motor, characterized in that: The dual-rotor permanent magnet servo drive motor comprises a motor body (10), a drive shaft (20) is arranged inside the motor body (10), a plurality of rotor components (30) are arranged outside the drive shaft (20), a stator core (40) is arranged outside the rotor component (30), a plurality of the rotor components (30) share one stator core (40), and the air gap magnetic flux of at least one of the rotor components (30) is adjustable.

2. The dual-rotor permanent magnet servo drive motor according to claim 1, characterized in that: The dual-rotor permanent magnet servo drive motor further comprises a front end cover (50) arranged on the front side of the motor body (10).

3. The dual-rotor permanent magnet servo drive motor according to claim 2, characterized in that: The dual-rotor permanent magnet servo drive motor further comprises a rear end cover (60) arranged on the rear side of the motor body (10), and the drive shaft (20) passes through the front end cover (50), the motor body (10) and the rear end cover (60).

4. The dual-rotor permanent magnet servo drive motor according to claim 1, characterized in that: A bearing component (70) is provided between the driving shaft (20) and the motor body (10).

5. The dual-rotor permanent magnet servo drive motor according to claim 1, characterized in that: At least one of the rotor components (30) is an electrically excited coil rotor.

6. The dual-rotor permanent magnet servo drive motor according to claim 5, characterized in that: The remaining rotor components (30) are rare earth Ru-Fe-B rotors.

7. The dual-rotor permanent magnet servo drive motor according to claim 1, characterized in that: A wind cover (80) is arranged at the rear side of the motor body (10), and a fan is arranged inside the wind cover (80).

8. The dual-rotor permanent magnet servo drive motor according to claim 1, characterized in that: A driver (90) is provided on the top of the motor body (10).

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