Connecting device for permanent magnet motor

Abstract

The utility model relates to the technical field of permanent magnet motors, and discloses a connecting device for a permanent magnet motor, which comprises a motor body and a connecting mechanism, the connecting mechanism comprises an outer rotor, a shaft connecting hole is arranged in the middle of the other side of the outer rotor, an outer magnet is fixedly connected in the middle of the inner part of the outer rotor, and the shaft connecting hole is communicated with the outer magnet. An isolation sleeve is movably connected to one side of the interior of the outer rotor, a rotor bearing is fixedly connected to one side of the interior of the isolation sleeve in a sleeving mode, an inner rotor is movably connected to the interior of the rotor bearing in a sleeving mode, and an inner magnet is fixedly connected to the middle of the outer side of the inner rotor; a static magnetic field is generated through the outer magnet of the outer rotor, through interaction of the magnetic field, the outer rotor rotates to generate magnetic force, torque is transmitted to the inner rotor to enable the inner rotor to rotate, when the load is too large, the inner rotor slips, the magnetic field changes to generate a large amount of heat to demagnetize the outer magnet and the inner magnet, and the overload protection effect is facilitated. And motor damage caused by overload is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of permanent magnet motors, and more specifically to a connecting device for permanent magnet motors. Background Art

[0002] A motor is an electromagnetic device that realizes the conversion or transmission of electric energy according to the law of electromagnetic induction. It is divided into electric motors (symbolized by M) and generators (symbolized by G). A permanent magnet motor is a form of a hybrid permanent magnet motor with a rectangular pulse wave and a sine wave current. A permanent magnet motor is composed of a stator pole, a rotor, a brush, a casing, etc. The stator pole is made of permanent magnets (permanent magnetic steel) with materials such as ferrite, aluminum nickel cobalt, and neodymium iron boron. According to its structural form, it can be divided into cylindrical and tile types. The rotor is generally made of laminated silicon steel sheets. A coupling is generally used to connect a permanent magnet motor to other devices. A coupling is a device that connects two shafts or a shaft and a rotating part, rotates together during the transmission of motion and power, and does not disengage under normal circumstances. It is sometimes also used as a safety device to prevent the connected parts from being subjected to excessive loads, thereby playing a role in overload protection.

[0003] Existing deficiencies: The existing motor connection device has a relatively complex structure and is a contact connection with the motor. When overload occurs, it will cause serious wear to the motor, or even damage the motor and make it unusable, which is not conducive to the connection; secondly, when the existing motor connection device is running in different media, it is necessary to use a sealing element for dynamic sealing, which either increases the rotational resistance to ensure reliable sealing, or the sealing is not tight and leakage occurs, which is not conducive to motor connection. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the utility model provides a connection device for a permanent magnet motor to solve the problems existing in the above-mentioned background technology.

[0005] The utility model provides the following technical solution: a connection device for a permanent magnet motor, comprising a motor body and a connection mechanism, wherein one side of the motor body is movably connected with the connection mechanism, the front and back sides of the bottom of the motor body are fixedly connected with a motor base, the connection mechanism comprises an outer rotor, a shaft connection hole is opened in the middle of the other side of the outer rotor, an outer magnet is fixedly connected to the middle of the inner part of the outer rotor, an inner side of the outer rotor is movably connected with an isolation sleeve, an inner side of the isolation sleeve is fixedly sleeved with a rotor bearing, the inner side of the rotor bearing is movably sleeved with an inner rotor, and the outer side of the inner rotor is fixedly connected with an inner magnet in the middle.

[0006] Furthermore, a side of the outer magnet close to the inner rotor is aligned with a side of the inner magnet close to the outer rotor, and the number of the outer magnets and the inner magnets is an even number, and they are arranged circumferentially in a NS pole crossing manner.

[0007] Furthermore, mounting holes are provided at the top and bottom of one side and the middle of the front and back sides of the isolation sleeve, and a fixing bolt is movably connected inside the mounting hole, and a fixing nut is movably connected on the other side of the fixing bolt.

[0008] Furthermore, the motor body includes a motor housing, a junction box is fixedly connected to one side of the top of the motor housing, a tail housing is fixedly connected to the other side of the motor housing, and a heat dissipation net is fixedly connected to the middle of the other side of the tail housing.

[0009] Furthermore, a stator core is fixedly connected to the inside of the motor housing, a winding groove is provided on the side of the stator core away from the motor housing, and the stator winding is movably connected inside the winding groove, a permanent magnet rotor is movably sleeved on the middle part of the inside of the stator core, a motor shaft is fixedly sleeved on the middle part of the inside of the permanent magnet rotor, rotating bearings are movably sleeved on both sides of the motor shaft, and a cooling fan is fixedly connected to the other side of the motor shaft.

[0010] Furthermore, base holes are provided on both sides of the top front of the motor base, and a support plate is fixedly connected to the middle of the front of the motor base.

[0011] Technical effects and advantages of the utility model:

[0012] 1. The utility model is provided with a connecting mechanism, which is connected to the motor shaft through the shaft connecting hole of the outer rotor. The rotation of the motor shaft drives the outer rotor to rotate, and the external magnet generates a static magnetic field. Through the interaction of the magnetic fields, a magnetic force is generated to transmit the torque to the inner rotor and rotate it, thereby rotating the output shaft. When the load is too large, the inner rotor slips, and the magnetic field changes to generate a large amount of heat to demagnetize the external magnet and the inner magnet, which is beneficial to play the role of overload protection and prevent the motor from being damaged by overload.

[0013] 2. The utility model is provided with a connecting mechanism, which is fixedly connected to the outer rotor through an isolating sleeve to isolate the outer rotor from the inner rotor, so that the sealing performance of the connecting mechanism is good, which is conducive to solving the problem of dynamic seal leakage, thereby improving the application range of the connecting mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0015] Figure 2 It is a schematic cross-sectional structure diagram of the connecting mechanism of the utility model.

[0016] Figure 3 It is a structural schematic diagram of the motor body of the utility model.

[0017] Figure 4 It is a schematic diagram of the cross-sectional structure of the motor body of the utility model.

[0018] The accompanying drawings are marked as follows: 1. Motor body; 101. Motor housing; 102. Junction box; 103. Tail housing; 104. Heat dissipation net; 105. Stator core; 106. Permanent magnet rotor; 107. Motor shaft; 108. Rotating bearing; 109. Cooling fan; 2. Connecting mechanism; 201. Outer rotor; 202. Shaft connecting hole; 203. Outer magnet; 204. Isolation sleeve; 205. Rotor bearing; 206. Inner rotor; 207. Inner magnet; 208. Mounting hole; 209. Fixing bolt; 210. Fixing nut; 3. Motor base; 301. Base hole; 302. Support plate. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are merely illustrative. The connection device for a permanent magnet motor involved in the present invention is not limited to the various structures recorded in the following embodiments. All other implementations obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0020] Reference Figure 1-Figure 4 The utility model provides a connection device for a permanent magnet motor, including a motor body 1 and a connection mechanism 2. The connection mechanism 2 is movably connected to one side of the motor body 1, and the front and back sides of the bottom of the motor body 1 are fixedly connected to a motor base 3. The connection mechanism 2 includes an outer rotor 201, and an axis connection hole 202 is opened in the middle of the other side of the outer rotor 201. An outer magnet 203 is fixedly connected to the middle of the inner part of the outer rotor 201. An isolation sleeve 204 is movably connected to one side of the inner part of the outer rotor 201. A rotor bearing 205 is fixedly sleeved on one side of the inner part of the isolation sleeve 204. The inner part of the rotor bearing 205 is movably sleeved. There is an inner rotor 206, and an inner magnet 207 is fixedly connected to the middle part of the outer side of the inner rotor 206. The motor shaft 107 is connected through the shaft connecting hole 202 of the outer rotor 201. The rotation of the motor shaft 107 drives the outer rotor 201 to rotate. The outer magnet 203 generates a static magnetic field. Through the interaction of the magnetic fields, magnetic force is generated to transmit torque to the inner rotor 206 and rotate it, thereby rotating the output shaft. When the load is too large, the inner rotor 206 slips, and the change in the magnetic field generates a large amount of heat to demagnetize the outer magnet 203 and the inner magnet 207, which is beneficial to play the role of overload protection and prevent damage to the motor caused by overload.

[0021] In a preferred embodiment, the side of the outer magnet 203 close to the inner rotor 206 is aligned with the side of the inner magnet 207 close to the outer rotor 201, and the number of the outer magnets 203 and the inner magnets 207 is even, and they are arranged circumferentially in a NS pole crossing manner.

[0022] In a preferred embodiment, mounting holes 208 are provided at the top and bottom of one side and the middle of the front and back sides of the isolation sleeve 204, and a fixing bolt 209 is movably connected inside the mounting hole 208, and a fixing nut 210 is movably connected on the other side of the fixing bolt 209. The fixing bolt 209 and the fixing nut 210 cooperate with each other, and the isolation sleeve 204 is fixedly connected to the outer rotor 201 to isolate the outer rotor 201 from the inner rotor 206, so that the sealing of the connecting mechanism 2 is good, which is conducive to solving the problem of dynamic seal leakage, thereby improving the application range of the connecting mechanism 2.

[0023] In a preferred embodiment, the motor body 1 includes a motor housing 101, a junction box 102 is fixedly connected to one side of the top of the motor housing 101, a tail housing 103 is fixedly connected to the other side of the motor housing 101, and a heat dissipation net 104 is fixedly connected to the middle of the other side of the tail housing 103.

[0024] In a preferred embodiment, a stator core 105 is fixedly connected to the inside of the motor housing 101, a winding groove is opened on the side of the stator core 105 away from the motor housing 101, and the stator winding is movably connected inside the winding groove, a permanent magnet rotor 106 is movably sleeved in the middle part of the stator core 105, a motor shaft 107 is fixedly sleeved in the middle part of the permanent magnet rotor 106, rotating bearings 108 are movably sleeved on both sides of the motor shaft 107, and a cooling fan 109 is fixedly connected to the other side of the motor shaft 107.

[0025] In a preferred embodiment, base holes 301 are opened on both sides of the top front of the motor base 3 , and a support plate 302 is fixedly connected to the middle of the front of the motor base 3 .

[0026] Working principle of the utility model: when working, the current enters the stator winding on the stator core 105 inside the motor through the junction box 102, and an electromagnetic force is generated between the stator core 105 and the permanent magnet rotor 106. The electromagnetic force causes the permanent magnet rotor 106 to rotate relative to the stator core 105, and then the motor shaft 107 rotates with the rotating bearing 108 as the support point. The rotation of the motor shaft 107 drives the cooling fan 109 to rotate, and the heat generated by the operation of the motor body 1 is blown from the heat dissipation net 104 to the outside of the tail shell 103, so as to dissipate the heat inside the motor shell 101. The motor shaft 107 is connected through the shaft connection hole 202 of the outer rotor 201. The rotation of the motor shaft 107 drives the outer rotor 201 to rotate, and the outer magnet 203 generates The static magnetic field generates magnetic force through the interaction of magnetic fields to transmit torque to the inner rotor 206, which then causes the inner rotor 206 to rotate inside the rotor bearing 205, and then causes the output shaft to rotate. When the load is too large, the inner rotor 206 slips, and the change in the magnetic field generates a large amount of heat to demagnetize the outer magnet 203 and the inner magnet 207, which is beneficial to overload protection and prevents damage to the motor caused by overload. The fixing bolts 209 and the fixing nuts 210 cooperate with each other, and the isolation sleeve 204 is fixedly connected to the outer rotor 201 to isolate the outer rotor 201 and the inner rotor 206, so that the sealing of the connecting mechanism 2 is good, which is beneficial to solving the problem of dynamic seal leakage, thereby improving the application range of the connecting mechanism 2.

[0027] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A connection device for a permanent magnet motor, comprising a motor body (1), characterized in that: The motor body (1) further comprises a connection mechanism (2), wherein one side of the motor body (1) is movably connected to the connection mechanism (2), the front and back sides of the bottom of the motor body (1) are fixedly connected to a motor base (3), the connection mechanism (2) comprises an outer rotor (201), a shaft connection hole (202) is provided in the middle of the other side of the outer rotor (201), an outer magnet (203) is fixedly connected to the middle of the inner part of the outer rotor (201), an isolation sleeve (204) is movably connected to one side of the inner part of the outer rotor (201), a rotor bearing (205) is fixedly sleeved on one side of the inner part of the isolation sleeve (204), an inner rotor (206) is movably sleeved on the inner part of the rotor bearing (205), and an inner magnet (207) is fixedly connected to the middle of the outer side of the inner rotor (206).

2. A connection device for a permanent magnet motor according to claim 1, characterized in that: The side of the outer magnet (203) close to the inner rotor (206) and the side of the inner magnet (207) close to the outer rotor (201) are aligned with each other, and the number of the outer magnets (203) and the inner magnets (207) is an even number, and they are arranged in a circle in a NS pole crossing manner.

3. A connection device for a permanent magnet motor according to claim 1, characterized in that: The isolation sleeve (204) is provided with mounting holes (208) at the top, bottom and middle of the front and back sides of one side, and a fixing bolt (209) is movably connected inside the mounting hole (208), and a fixing nut (210) is movably connected to the other side of the fixing bolt (209).

4. A connection device for a permanent magnet motor according to claim 1, characterized in that: The motor body (1) comprises a motor housing (101), a junction box (102) is fixedly connected to one side of the top of the motor housing (101), a tail housing (103) is fixedly connected to the other side of the motor housing (101), and a heat dissipation net (104) is fixedly connected to the middle of the other side of the tail housing (103).

5. A connection device for a permanent magnet motor according to claim 4, characterized in that: A stator core (105) is fixedly connected to the inside of the motor housing (101); a winding groove is provided on a side of the stator core (105) away from the motor housing (101); and a stator winding is movably connected inside the winding groove; a permanent magnet rotor (106) is movably sleeved in the middle of the inside of the stator core (105); a motor shaft (107) is fixedly sleeved in the middle of the inside of the permanent magnet rotor (106); rotating bearings (108) are movably sleeved on both sides of the motor shaft (107); and a cooling fan (109) is fixedly connected to the other side of the motor shaft (107).

6. A connection device for a permanent magnet motor according to claim 1, characterized in that: Base holes (301) are provided on both sides of the top front of the motor base (3), and a support plate (302) is fixedly connected to the middle of the front of the motor base (3).

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