Novel torque detection motor

Abstract

The utility model relates to a novel torque detection motor, and relates to the technical field of motors, the novel torque detection motor comprises a motor body, the two radial sides of the motor body are fixedly provided with support plates, the bottom surface of each support plate is provided with a piezoelectric sensor, the bottom surface of each piezoelectric sensor is provided with a base, and the piezoelectric sensors completely support the weight of the motor body and the support plates. The base comprises a bottom plate and two supporting seats fixed to the bottom plate, the piezoelectric sensors are located on the supporting seats, and a space for the lower portion of the motor body to enter is formed between the two supporting seats. When the motor body drives the load to operate, the motor body is affected by the counter-acting force to generate torque, the torque acts on the piezoelectric sensor through the supporting plate, and the piezoelectric sensor outputs a signal to the control system. The piezoelectric sensor is adopted as a novel torque detection element, a traditional shaft connection type torque sensor does not need to be used, and therefore the situation that the axial space of the motor is occupied is avoided, and installation and use are facilitated in the occasion where the axial space of the motor is limited.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of electric machines, in particular to a novel torque detection electric machine. BACKGROUND

[0002] An electric machine is a basic electric mechanical device for outputting torque. For some working occasions that need to detect load changes and monitor torque, the electric machine is generally connected with a torque detection device.

[0003] The utility model discloses a motor torque sensor mounting structure and motor testing device, motor torque sensor mounting structure includes motor, motor base, limit cover, torque sensor and flange shaft, torque sensor is fixedly connected with motor on one side, and is fixedly connected with the end cover of motor base on the other side. The bearing arranged in the motor base is arranged in the motor base, and the motor and the torque sensor and the flange shaft fixedly connected with the motor are limited to move in the axial direction and the radial direction, and the circumferential rotation of the motor and the torque sensor and the flange shaft fixedly connected with the motor is limited through the circumferential fixed structure between the limit cover fixedly connected with the motor base and the flange shaft.

[0004] For the related technology in the above, the inventor believes that the existing torque sensor is generally installed at the axial end of the electric machine, which occupies a large amount of axial space, and when the installation place is limited, the problem of unable to install exists. UTILITY MODEL CONTENTS

[0005] The application provides a novel torque detection electric machine, which does not occupy the axial space of the electric machine, and is beneficial to installation and use in occasions where the axial space of the electric machine is limited.

[0006] The application provides a novel torque detection electric machine, which adopts the following technical scheme:

[0007] A novel torque detection electric machine comprises an electric machine body, support plates are fixed on the radial sides of the electric machine body, piezoelectric sensors are installed on the bottom surfaces of the support plates, and bases are installed on the bottom surfaces of the piezoelectric sensors.

[0008] When the electric machine body drives a load to run, the electric machine body is also affected by a reaction force and generates a torque, which acts on the piezoelectric sensors through the support plates, and the piezoelectric sensors output signals to a control system. The values obtained by the piezoelectric sensors are pressure values, and the values obtained by all the piezoelectric sensors can be obtained by simple addition and subtraction operations. Since the distance between the piezoelectric sensors and the central axis of the electric machine body is fixed, the size of the torque can be obtained by simple multiplication operation, so as to serve as a torque measurement value when the electric machine drives the load to run.

[0009] Optionally, the detection positions of all the piezoelectric sensors are located on the same plane as the central axis of the motor body.

[0010] By adopting the technical scheme, the force direction of the piezoelectric sensor is perpendicular to the force arm, thereby reducing errors and improving detection accuracy.

[0011] Optionally, the distance between each piezoelectric sensor and the central axis of the motor body is the same.

[0012] By adopting the technical scheme, the length of the force arm is the same, thereby simplifying the operation steps.

[0013] Optionally, two piezoelectric sensors are arranged on each side of the motor body.

[0014] By adopting the technical scheme, there are four piezoelectric sensors in total, and the design is symmetrical, thereby achieving the effect of stable support.

[0015] Optionally, one piezoelectric sensor is arranged on one side of the motor body, and two piezoelectric sensors are arranged on the other side of the motor body.

[0016] By adopting the technical scheme, compared with four piezoelectric sensors, the number of piezoelectric sensors is reduced, thereby reducing the cost, and the three-point support mode is easier to level, thereby avoiding the case that a piezoelectric sensor does not bear the load.

[0017] Optionally, the base comprises a bottom plate and two support seats fixed on the bottom plate, the piezoelectric sensor is arranged on the support seat, and a space for the lower part of the motor body to enter is formed between the two support seats.

[0018] By adopting the technical scheme, a space is left for the motor bottom to be suspended.

[0019] Optionally, a ventilation opening is formed in the middle of the bottom plate, and the ventilation opening is located directly below the motor body.

[0020] By adopting the technical scheme, the ventilation opening is used for ventilation, and also has the effect of reducing weight.

[0021] Optionally, the support plate is provided with a mounting hole through which a bolt passes, and the bolt is threadedly connected with the top surface of the piezoelectric sensor.

[0022] By adopting the technical scheme, the bolt is screwed into the mounting hole, thereby fixing the support plate and the piezoelectric sensor.

[0023] Optionally, a plurality of positioning pins are fixed on the base, and a positioning hole for inserting the positioning pin is formed in the bottom surface of the piezoelectric sensor.

[0024] By adopting the technical scheme, the positioning pin is inserted into the positioning hole, the piezoelectric sensor is prevented from spontaneous displacement, compared with bolt fixing, the assembly efficiency is improved by the positioning pin, and the normal operation of the motor is not affected.

[0025] Optionally, a plurality of foot holes are formed in the base, and the foot holes are strip-shaped holes.

[0026] By adopting the technical scheme, when the base is fixed by the foot bolts, the installation position can be slightly adjusted, and the output shaft of the motor body and the load end are accurately connected.

[0027] To sum up, the application has the following beneficial technical effects:

[0028] The piezoelectric sensor is used as a new torque detection element, and the traditional shaft connection type torque sensor is not used, so that the axial space of the motor is avoided, and the motor is installed and used in the occasion where the axial space is limited. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a perspective view of a new torque detection motor of embodiment one;

[0030] Figure 2 is a partial exploded view of embodiment one;

[0031] Figure 3 is a perspective view of embodiment two.

[0032] BRIEF DESCRIPTION OF DRAWINGS: 1, motor body; 11, support plate; 2, piezoelectric sensor; 3, base; 31, bottom plate; 32, support seat; 33, foot hole; 34, ventilation hole; 12, mounting hole; 35, positioning pin; 21, positioning hole. DETAILED DESCRIPTION

[0033] The application will be further described in detail below with reference to the drawings.

[0034] Embodiment one:

[0035] Referring to Figure 1 The embodiment discloses a new torque detection motor, which comprises a motor body 1, support plates 11 are fixed on the two radial sides of the motor body 1, piezoelectric sensors 2 are installed on the bottom surfaces of the support plates 11, bases 3 are installed on the bottom surfaces of the piezoelectric sensors 2, and the piezoelectric sensors 2 completely support the weights of the motor body 1 and the support plates 11.

[0036] The piezoelectric sensor 2 of the embodiment is provided with two on both sides of the motor body 1, and is symmetrically distributed. The distance between all piezoelectric sensors 2 and the central axis of the motor body 1 is equal, and the detection position of all piezoelectric sensors 2 is located in the same plane as the central axis of the motor body 1. The piezoelectric sensor 2 is a sensor based on the piezoelectric effect. The sensitive element of the piezoelectric sensor 2 is made of piezoelectric material. The surface of the piezoelectric material generates an electric charge after being stressed. The electric charge is amplified and impedance-converted by a charge amplifier and a measurement circuit to become an electric quantity output proportional to the external force.

[0037] The reason for using the piezoelectric sensor 2 is that the piezoelectric sensor 2 has high detection accuracy. A small amount of deformation can be detected and an electric signal can be output. In actual implementation, the deformation of the piezoelectric sensor 2 is controlled to be within 10 um to reduce the influence of the detection surface inclination on the detection accuracy. Since the torque is the product of the force arm and the force, the longer the force arm, the smaller the force on the piezoelectric sensor 2. The length of the support plate 11 is pre-set according to the corresponding motor body 1 model and working parameters, so as to control the deformation range of the piezoelectric sensor 2. The model of the piezoelectric sensor 2 is preferably U10M. The U10M force sensor is a pull / push bidirectional force sensor for static and dynamic measurement, and has high detection accuracy.

[0038] The base 3 includes a bottom plate 31 and two support seats 32 fixed to the bottom plate 31. The piezoelectric sensor 2 is located on the support seat 32, and a space is formed between the two support seats 32 for the lower part of the motor body 1 to enter. The motor body 1 does not contact the bottom plate 31.

[0039] A plurality of foot holes 33 are formed in the base 3. The foot hole 33 is a strip hole. The foot hole 33 is specifically formed at the corner position of the bottom plate 31. The length direction of the strip hole is along the axial direction of the motor body 1. When the base 3 is fixed by the anchor bolt through the strip-shaped foot hole 33, the installation position can be adjusted slightly, and the output shaft of the motor body 1 and the load end can be accurately connected. A ventilation hole 34 is formed in the middle of the bottom plate 31. The ventilation hole 34 is located directly below the motor body 1. After the bottom plate 31 is installed and fixed on the two cross beams through the foot hole 33, the middle part of the bottom plate 31 can be suspended. The ventilation hole 34 is used for ventilation and also has a weight reduction effect.

[0040] Referring to Figure 1 and Figure 2 , the mounting method of the piezoelectric sensor 2 is as follows: the support plate 11 is provided with a mounting hole 12 for the bolt to pass through, and the bolt is threadedly connected with the top surface of the piezoelectric sensor 2. A plurality of positioning pins 35 are fixed on the base 3, and the bottom surface of the piezoelectric sensor 2 is provided with a positioning hole 21 for the positioning pin 35 to insert. When the axis of the motor body 1 is horizontally installed, the combination of the positioning pin 35 and the positioning hole 21 is stable enough. In another embodiment, the bottom surface of the piezoelectric sensor 2 and the base 3 can also be fixed by a bolt.

[0041] The implementation principle of the new torque detection motor of the embodiment of the application is as follows: when the motor is installed, the axis of the motor body 1 is installed horizontally, and all piezoelectric sensors 2 are preferably on the same horizontal plane. When the motor body 1 is not running, no torque is generated, and at this time, all piezoelectric sensors 2 share the gravity of the motor body 1, and the force detection value at this time is calibrated as zero.

[0042] When the motor body 1 drives the load to run, the motor body 1 is also affected by the reaction force to generate torque, and the torque acts on the piezoelectric sensor 2 through the support plate 11. The torque causes the piezoelectric sensor 2 on one side of the motor body 1 to be pressed, and the piezoelectric sensor 2 on the other side to be pulled. The piezoelectric sensor 2 outputs a signal to the control system. The value obtained by the piezoelectric sensor 2 is the pressure, and the values obtained by all piezoelectric sensors 2 can be obtained by simple addition and subtraction operation. The distance between each piezoelectric sensor 2 and the central axis of the motor body 1 is the same, so the length of the force arm is the same. Therefore, the size of the torque can be obtained by simple multiplication operation, so as to serve as the torque measurement value when the motor drives the load to run. All operations are completed by the control system.

[0043] By setting the detection positions of all piezoelectric sensors 2 and the central axis of the motor body 1 on the same plane, the force direction of the piezoelectric sensor 2 is perpendicular to the force arm, thereby reducing the error and improving the detection accuracy. By setting the distance between each piezoelectric sensor 2 and the central axis of the motor body 1 to be the same, the length of the force arm is the same, thereby simplifying the operation steps.

[0044] In summary, the piezoelectric sensor 2 is used as a new torque detection element in the application, and the traditional shaft connection type torque sensor is not needed, thereby avoiding occupying the axial space of the motor, and facilitating installation and use in occasions where the axial space of the motor is limited.

[0045] Embodiment two:

[0046] Reference Figure 3 A new torque detection motor, the difference between embodiment two and embodiment one is that one piezoelectric sensor 2 is arranged on one side of the motor body 1, and two piezoelectric sensors 2 are arranged on the other side of the motor body 1.

[0047] After the number of piezoelectric sensors 2 is changed to three, according to the principle of three-point support, the weight of the motor body 1 can still be stably supported, and there is no difference in the calculation of torque. Since the number of piezoelectric sensors 2 is reduced, the cost is reduced, and through the three-point support mode, it is easier to level, and the situation that a piezoelectric sensor 2 does not bear the weight is avoided.

[0048] The above are preferred embodiments of the application, and do not limit the protection scope of the application, so: any equivalent changes made on the basis of the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. A new type of torque detection motor comprising a motor body (1), characterized in that: The motor body (1) is fixed with support plates (11) on both sides in the radial direction, the bottom surface of the support plates (11) is provided with piezoelectric sensors (2), the bottom surface of the piezoelectric sensors (2) is provided with bases (3), and the piezoelectric sensors (2) completely support the weight of the motor body (1) and the support plates (11).

2. A novel torque detection motor according to claim 1, characterized in that: The detection positions of all the piezoelectric sensors (2) are located in the same plane as the central axis of the motor body (1).

3. A novel torque detection motor as claimed in claim 1, wherein: The distance between each piezoelectric sensor (2) and the central axis of the motor body (1) is the same.

4. A novel torque detection motor according to claim 1, characterized in that: Two piezoelectric sensors (2) are arranged on both sides of the motor body (1).

5. A novel torque detection motor as claimed in claim 1, wherein: One piezoelectric sensor (2) is arranged on one side of the motor body (1), and two piezoelectric sensors (2) are arranged on the other side of the motor body (1).

6. A novel torque detection motor as claimed in claim 1, wherein: The base (3) comprises a bottom plate (31) and two support seats (32) fixed on the bottom plate (31), the piezoelectric sensor (2) is located on the support seat (32), and a space for the lower part of the motor body (1) to enter is formed between the two support seats (32).

7. A novel torque detection motor as claimed in claim 6, wherein: A ventilation opening (34) is formed in the middle of the bottom plate (31), and the ventilation opening (34) is located directly below the motor body (1).

8. A novel torque detection motor as claimed in claim 1, wherein: The support plate (11) is provided with mounting holes (12) for bolts to pass through, and the bolts are threadedly connected to the top surface of the piezoelectric sensor (2).

9. A novel torque detection motor as claimed in claim 1, wherein: A plurality of positioning pins (35) are fixed on the base (3), and the bottom surface of the piezoelectric sensor (2) is provided with positioning holes (21) for the positioning pins (35) to be inserted.

10. A novel torque detection motor as claimed in claim 1, wherein: A plurality of foot holes (33) are formed in the base (3), and the foot holes (33) are strip-shaped holes.

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