Shaftless permanent magnet low-speed direct drive motor

Abstract

A shaftless permanent magnet low-speed direct drive motor is suitable for an equipment end with a transmission shaft and comprises a machine base, the transmission shaft of the equipment end penetrates through and extends out of an equipment shell, a stator and a rotor are further assembled in the machine base, the stator is connected to the inner wall of the machine base, and the rotor is connected to the inner wall of the machine base. And the rotor is sleeved on a transmission shaft at an equipment end and is matched with the stator. During application, the transmission shaft of the equipment end is directly connected with the rotor of the motor, integration of the direct-drive motor and the mechanical structure of the equipment end is achieved, structures such as a motor shaft, a bearing, a bearing inner cover and a bearing outer cover are omitted, and therefore the problem that a power source needs a large number of parts is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially relates to a shaftless permanent magnet low speed direct drive motor. BACKGROUND

[0002] The sand mill is also called the bead mill, and is mainly used for wet grinding of chemical liquid products. In the related art, the sand mill usually uses a whole permanent magnet synchronous motor as a power source. The stator of the whole permanent magnet synchronous motor is fixed in the inner cavity of a base. The rotor is fixed on the base through a front end cover, a rear end cover, a bearing, an inner and outer bearing gland and other structures. The motor shaft is connected with a transmission shaft through a belt structure to drive the transmission shaft to work. However, the whole permanent magnet synchronous motor as the power source needs to use many parts, which leads to a high total cost of the sand mill. SUMMARY

[0003] In view of the deficiencies in the background art, the utility model aims to provide a shaftless permanent magnet low speed direct drive motor.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme.

[0005] A shaftless permanent magnet low speed direct drive motor is suitable for a device end with a transmission shaft, comprising a base, the transmission shaft of the device end is arranged through the base and extends out of the base, the inside of the base is further provided with a stator and a rotor, the stator is connected to the inner wall of the base, and the rotor is sleeved on the transmission shaft of the device end and matched with the stator.

[0006] Further, the base comprises a shell and an end cover arranged at the top of the shell, and the transmission shaft is arranged through the end cover and exposed outside the end cover.

[0007] Further, the transmission shaft is sleeved with a water collecting disc at the position of the end cover, the end cover is provided with a water inlet hole in communication with the water collecting disc, and the water collecting disc is provided with a plurality of inclined baffles extending upward in the circumferential direction.

[0008] Further, the water collecting disc is communicated with a drain pipe, one end of the drain pipe is communicated with the water collecting disc, and the other end is communicated with the outside.

[0009] Further, it further comprises a flange structure, the flange structure comprises an interface flange and a first fastener, the interface flange is connected to the base, and the first fastener is arranged through the interface flange and inserted into the device end.

[0010] Further, the side of the device end close to the base is provided with a positioning stop, and the side of the interface flange close to the device end is provided with a positioning piece, and the positioning piece is inserted into the positioning stop.

[0011] Further, a junction box for electrical connection is further included, and the junction box is arranged on one side of the base.

[0012] Further, the rotor comprises a permanent magnet, a rotor core and a rotor support which are nested in sequence from outside to inside, and the rotor support comprises an outer cylinder portion, the rotor core is sleeved outside the outer cylinder portion, an inner cylinder portion is connected to the outer cylinder portion, the transmission shaft is connected to the inner cylinder portion, and an inner cylinder surface of the inner cylinder portion and an outer peripheral surface of the transmission shaft are matched with each other.

[0013] Further, a limiting step is arranged on the side wall of the transmission shaft, one end of the inner cylinder portion close to the equipment end is abutted against a step surface of the limiting step, and the other end is provided with a clamping groove.

[0014] Further, a shaft shoulder is arranged on the side wall of the transmission shaft close to the clamping groove, a close-fitting sleeve is arranged between the shaft shoulder and the clamping groove, and a second fastener is arranged in the close-fitting sleeve.

[0015] The utility model discloses the beneficial effect is:

[0016] 1. The utility model provides a kind of shaftless permanent magnet low-speed direct drive motor, by the transmission shaft of equipment end is directly connected with the rotor of motor, realize the integration of direct drive motor and equipment end mechanical structure, save motor shaft, bearing, bearing inner and outer cover and other structures, to improve the problem that many parts are needed to use by power source, reduce the total cost of equipment end, and, save part also make the installation of equipment end more simple, failure rate is lower and whole machine volume is smaller.

[0017] 2. The utility model provides a kind of shaftless permanent magnet low-speed direct drive motor, by the setting of end cover, end cover can avoid the structure in the motor to show outside, can protect the structure in the motor, can guarantee the cleanliness of motor internal structure simultaneously.

[0018] 3. The utility model provides a kind of shaftless permanent magnet low-speed direct drive motor, by the setting of flange structure, flange structure is used to connect the equipment end and the base, guarantee the connection stability of equipment end and motor.

[0019] 4. The utility model provides a kind of shaftless permanent magnet low-speed direct drive motor, by the setting of junction box, junction box is used to install controller, wire harness and other structures, to guarantee the appearance of whole machine.

[0020] 5. The utility model provides a kind of shaftless permanent magnet low-speed direct drive motor, by the setting of water receiving tray, water receiving tray is used to contain the water drop of transmission shaft's feeding end scattered, prevent water from entering the motor, improve work safety, and drain pipe is arranged to the water accumulated in water receiving tray to outside.

[0021] 6. The utility model provides a kind of shaftless permanent magnet low-speed direct drive motor, by the setting of close-fitting cover, the vibration generated when rotor operates can be reduced, and it is convenient to assist fixed rotor simultaneously. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 It is a sectional view of the shaftless permanent magnet low-speed direct drive motor of the utility model;

[0024] Figure 2 It is Figure 1 the enlarged view of A of;

[0025] Figure 3 It is Figure 1 the enlarged view of B of;

[0026] Figure 4 It is a plan view of the shaftless permanent magnet low-speed direct drive motor of the utility model.

[0027] In the drawing, 101, housing;102, end cover;1021, water inlet hole;20, stator;301, rotor core;302, outer tube portion;303, inner tube portion;401, water pan;402, drain pipe;501, interface flange;502, first fastener;5011, positioning piece;60, junction box;3021, clamping groove;70, close-fitting cover;701, second fastener;801, transmission shaft;8011, limiting step;8012, shaft shoulder. DETAILED DESCRIPTION

[0028] The utility model will be described in detail in combination with Figures 1-4 The utility model is described in detail.

[0029] A kind of shaftless permanent magnet low-speed direct drive motor, as Figures 1-4 Shown, it is applicable to the equipment end with transmission shaft 801, including machine base, the transmission shaft 801 of equipment end is worn and is stretched to the outside of machine base, the inside of machine base is also equipped with stator 20 and rotor, stator 20 is connected to the inner wall of machine base, rotor is sleeved on the transmission shaft 801 of equipment end and cooperates with stator 20.

[0030] The equipment is a sand mill, which has a housing 802 and a hollow drive shaft 801. One end of the drive shaft 801 extends outside the housing 802 and is used for feeding. It is understood that the motor proposed in this invention, when applied to the sand mill, directly mounts the drive shaft 801 of the sand mill onto the motor's rotor; that is, the motor is a direct-drive motor. Therefore, the direct-drive motor replaces the integral permanent magnet synchronous motor as the power source. By directly installing the direct-drive motor into the existing structure of the sand mill, the mechanical structure of the direct-drive motor and the sand mill are integrated, eliminating the need for motor shafts, bearings, and bearing inner and outer covers. This improves the problem of numerous parts required for the power source and reduces the overall cost of the sand mill. Furthermore, eliminating some parts also simplifies the installation of the sand mill, reduces the failure rate, and makes the overall size of the machine smaller.

[0031] In practical applications, when the motor is used in a sand mill, the motor base can be directly connected to the sand mill housing 802 using screws; alternatively, screws can be used to connect the motor base to the sand mill housing 802 via a flange structure. When the motor is used in a sand mill, its operation can be controlled by a frequency converter, allowing for better adjustment of the motor's power and variable speed operation, thereby achieving a better grinding effect.

[0032] In this embodiment, the base includes a housing 101 and an end cover 102 disposed on the top of the housing 101. The drive shaft 801 passes through the end cover 102 and is exposed outside the end cover 102. The end cover 102 can prevent the internal structure of the motor from being exposed, protect the internal structure of the motor, and ensure the cleanliness of the internal structure of the motor.

[0033] In this embodiment, a water receiving tray 401 is sleeved on the drive shaft 801 at the position of the end cover 102. The end cover 102 is provided with a water inlet hole 1021 that communicates with the water receiving tray 401. Several baffles extending obliquely upward are provided inside the water receiving tray 401 along its circumferential direction.

[0034] In this embodiment, the water receiving tray 401 is connected to a drain pipe 402, one end of which is connected to the water receiving tray 401 and the other end is connected to the outside.

[0035] In this embodiment, as Figure 3 As shown, it also includes a flange structure, which comprises an interface flange 501 and a first fastener 502. The interface flange 501 is connected to the base, and the first fastener 502 passes through the interface flange 501 and is inserted into the equipment end. The first fastener 502 can be a screw, bolt, or other connection structure. Furthermore, a positioning stop is provided on the side of the equipment end near the base, and a positioning element 5011 is provided on the side of the interface flange 501 near the equipment housing 802. The positioning element 5011 is inserted into the positioning stop.

[0036] In the embodiment, a junction box 60 for electrical connection is further included, and the junction box 60 is arranged on one side of the base.

[0037] In the embodiment, the rotor includes, from outside to inside, a permanent magnet, a rotor core 301, and a rotor support. The rotor support includes an outer cylinder portion 302, and the rotor core 301 is sleeved on the outer cylinder portion 302. The rotor support further includes an inner cylinder portion 303 connected to the inner side of the outer cylinder portion 302, and a transmission shaft 801 connected to the inner side of the inner cylinder portion 303, and the inner cylinder surface of the inner cylinder portion 303 and the outer peripheral surface of the transmission shaft 801 are matched with each other.

[0038] The rotor core 301 is sleeved on the outer cylinder portion 302 of the rotor support to ensure that the rotor support has sufficient supporting strength for the rotor. The transmission shaft 801 is connected to the inner cylinder portion 303 of the rotor support, and the inner side surface of the inner cylinder portion 303 and the outer side surface of the transmission shaft 801 are matched with each other, which can improve the connection reliability between the transmission shaft 801 and the rotor support.

[0039] In the embodiment, as shown in Figure 2 The side wall of the transmission shaft 801 is provided with a limiting step 8011, one end of the inner cylinder portion 303 close to the equipment is abutted against the step surface of the limiting step 8011, and the other end is provided with a clamping groove 3021. By abutting the end of the inner cylinder portion 303 close to the equipment shell 802 against the step surface of the limiting step 8011, relative sliding of the inner cylinder portion 303 relative to the transmission shaft 801 can be avoided, and the inner cylinder portion 303 can be limited and fixed. A flat key is arranged between the inner cylinder portion 303 and the transmission shaft 801.

[0040] In the embodiment, the side wall of the transmission shaft 801 is provided with a shaft shoulder 8012 close to the clamping groove 3021, a close-fitting sleeve is arranged between the shaft shoulder 8012 and the clamping groove 3021, and a second fastener 701 is arranged in the close-fitting sleeve. The second fastener 701 can be a connecting structure such as a screw or a bolt, which can improve the stability between the rotor and the transmission shaft 801 to avoid relative movement between the rotor and the transmission shaft 801, so that the rotor of the motor can stably drive the transmission shaft 801 to rotate through the flat key connection and the close-fitting sleeve 70.

[0041] During installation, the rotor is installed first. By continuously tightening the locking member, the close-fitting sleeve 70, the rotor support, the rotor core 301, and the like can be fastened and connected with the transmission shaft 801. Then, the base is installed. Since the rotor is provided with a magnetic steel, the stator 20 and the rotor are attracted together before the base is fastened to the sand mill body. During installation, the base and the sand mill body are fastened and connected by positioning through the flange structure and continuously tightening the locking member, so that the stator 20 and the rotor are transformed from the attracted state to the separated state, and normal installation of the motor is realized.

[0042] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A shaftless permanent magnet low-speed direct drive motor, suitable for a device end with a transmission shaft, characterized in that, The device comprises a base, a transmission shaft of the device end penetrates through and extends out of the base, and a stator and a rotor are arranged inside the base.

2. The shaftless permanent magnet low-speed direct drive motor of claim 1, wherein, The base comprises a housing and an end cover arranged on the top of the housing, the transmission shaft penetrates through the end cover and is exposed to the outside of the end cover.

3. The shaftless permanent magnet low-speed direct drive motor of claim 2, wherein, The transmission shaft is sleeved with a water pan at the position of the end cover, the end cover is provided with a water inlet hole in communication with the water pan, and the water pan is provided with a plurality of inclined baffles extending upward in the circumferential direction.

4. The shaftless permanent magnet low-speed direct drive motor of claim 3, wherein, The water pan is communicated with a drain pipe, one end of the drain pipe is communicated with the water pan, and the other end is communicated with the outside.

5. The shaftless permanent magnet low-speed direct drive motor of claim 1, wherein, The device further comprises a flange structure, the flange structure comprises an interface flange and a first fastener, the interface flange is connected to the base, and the first fastener penetrates through the interface flange and is inserted into the device end.

6. The shaftless permanent magnet low-speed direct drive motor of claim 5, wherein, The device end is provided with a positioning stop near one side of the base, and the interface flange is provided with a positioning piece near one side of the device end, the positioning piece is inserted into the positioning stop.

7. The shaftless permanent magnet low-speed direct drive motor of claim 1, wherein, The device further comprises a junction box for electrical connection, and the junction box is arranged on one side of the base.

8. The shaftless permanent magnet low-speed direct drive motor of claim 1, wherein, The rotor comprises a permanent magnet, a rotor core and a rotor support which are nested in sequence from outside to inside, the rotor support comprises an outer cylinder portion, the rotor core is sleeved outside the outer cylinder portion, an inner cylinder portion is connected to the inside of the outer cylinder portion, the transmission shaft is connected to the inside of the inner cylinder portion, and the inner cylinder surface of the inner cylinder portion and the outer peripheral surface of the transmission shaft are matched with each other.

9. The shaftless permanent magnet low-speed direct drive motor of claim 8, wherein, The side wall of the transmission shaft is provided with a limiting step, one end of the inner cylinder portion near the device end abuts against the step surface of the limiting step, and the other end is provided with a clamping groove.

10. The shaftless permanent magnet low-speed direct drive motor of claim 9, wherein, The side wall of the transmission shaft is provided with a shaft shoulder near the position of the clamping groove, a close-fitting sleeve is arranged between the shaft shoulder and the clamping groove, and a second fastener is arranged in the close-fitting sleeve.

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