Linear motor dynamic characteristic test platform

Abstract

The utility model discloses a dynamic characteristic test platform for a linear motor, which relates to the technical field of motor equipment test and comprises a linear motor, the linear motor comprises a base, a stator and a rotor, the stator is fixedly arranged in a groove of the base, the rotor is movably sleeved outside the stator, a sliding plate is fixedly arranged at the top of the rotor, and the sliding plate is fixedly arranged on the base. A force sensor is fixedly arranged on the sliding plate; a fixed steel plate is fixedly arranged above one end of the base, a lead screw is arranged in a penetrating mode through the fixed steel plate, one end of the lead screw penetrates through the worm gear device and extends to the outer side of the worm gear device, the worm gear device is connected with a servo motor through a coupler, an end flange is fixedly arranged at the other end of the lead screw, and the lead screw moves to drive the end flange to abut against the force sensor. The linear motor to be tested can be controlled by the servo motor to move at a constant speed along the guide rail, the force sensor is used for measuring the interaction force between the sliding plate and the end flange, and the dynamic thrust of the linear motor can be tested.

Description

Technical Field

[0001] The utility model relates to the technical field of motor equipment testing, in particular to a linear motor dynamic characteristic testing platform. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art.

[0003] A linear motor is an electromagnetic device that can directly generate progressive unidirectional or back-and-forth oscillating stroke motion without a connecting rod device. It is a motor with a special structural form. A linear generator is also an electromagnetic device that utilizes linear motion, which can convert the mechanical energy of linear motion into single-phase AC electrical energy. A rotary motor can be in a motor operating state or a generator operating state. A linear motor is similar to a rotary motor and can also work in a motor operating state or a generator operating state. From this point of view, linear motors and rotary motors correspond to each other. A linear motor is equivalent to a rotary motor laid out along a straight line. Unlike the linear motion driven by a rotary motor, a linear motor can directly complete linear motion without the aid of auxiliary transmission devices such as ball screws and gears. It has broad application prospects in linear transportation and other linear drive occasions.

[0004] Dynamic thrust testing can help evaluate the thrust output capability of a linear motor during motion, taking into account factors such as acceleration and speed, which is closer to actual working conditions. Dynamic thrust testing helps evaluate the performance of a linear motor in actual applications, especially when frequent changes in speed or load are required.

[0005] The traditional linear motor dynamic characteristics test platform has some shortcomings. First, the test device is not convenient for testing linear motors. Different linear motors have different specifications and shapes. The traditional test device is difficult to ensure that the travel direction of the linear motor and the travel direction of the test device are in the same straight line. As the main component of precision motion control, it is extremely important to test the thrust distribution of the actuator at various positions. The traditional test method mainly relies on manual or simple test devices for testing, which has the problems of difficult testing and low accuracy. Utility Model Content

[0006] In order to solve the technical problems existing in the prior art, the utility model provides a linear motor dynamic characteristic test platform to achieve the test of the dynamic thrust of the linear motor.

[0007] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0008] A linear motor dynamic characteristics test platform comprises a linear motor, wherein the linear motor comprises a base, a stator and a mover, wherein the stator is fixedly arranged in a groove of the base, the mover is movably sleeved on the outer side of the stator, a sliding plate is fixedly arranged on the top of the mover, and a force sensor is fixedly arranged on the sliding plate; a fixed steel plate is fixedly arranged above one end of the base, a lead screw is inserted through the fixed steel plate, one end of the lead screw passes through a worm gear device and extends to the outside of the worm gear device, the worm gear device is connected to a servo motor through a coupling, and an end flange is fixedly arranged on the other end of the lead screw, and the movement of the lead screw drives the end flange to abut against the force sensor.

[0009] According to a further technical solution, a support frame is fixedly arranged on the outer side of one end of the base, and the support frame is sleeved on the outer side of the end portion of the base and fixedly connected to the fixed steel plate.

[0010] According to a further technical solution, guide rails are fixedly arranged on both sides of the top of the base, and two guide rail sliders are slidably arranged on the guide rails on each side.

[0011] According to a further technical solution, the sliding plate is located between the guide rail sliders and is fixedly connected to the guide rail sliders.

[0012] According to a further technical solution, the worm gear device comprises a worm wheel and a worm which mesh with each other.

[0013] According to a further technical solution, a lead screw passes through the center hole of the worm wheel.

[0014] According to a further technical solution, the outer periphery of the lead screw is provided with threads which are screwed to the center hole of the worm wheel.

[0015] According to a further technical solution, the worm is connected to the output shaft of the servo motor via a coupling.

[0016] According to a further technical solution, a position sensor is fixedly installed below the side of the mover.

[0017] According to a further technical solution, the sliding plate comprises a transverse plate and a vertical plate connected vertically, and a force sensor is fixedly arranged on a side of the vertical plate facing the lead screw.

[0018] Beneficial effects of the utility model:

[0019] The utility model can realize the test of the dynamic thrust of the linear motor. The lead screw is fixed on the base by a steel plate, which ensures that the motor mover does not undergo relative displacement when measuring force. By setting up a lead screw moving system, the motor rotational motion is converted into linear motion, and the movement speed and progress can be accurately controlled by the servo motor, so that the linear motor to be tested can be controlled to move at a uniform speed along the guide rail. A force sensor is used to measure the interaction force (i.e., dynamic thrust) between the sliding plate fixed on the mover and the lead screw end flange, so as to realize the test of the dynamic thrust of the linear motor.

[0020] The utility model arranges a corresponding magnetic grid channel on the edge of the inner wall of the stator, and can read the position information of the sliding plate fixed above the mover in real time through the position sensor, so that the position information can be accurately grasped; a servo motor is used in the screw moving system to control the system speed, so that the moving speed is more accurate and reliable; the screw is used to ensure that the test device (i.e., the screw moving system, the force sensor, etc.) is in the same straight line as the movement direction of the sliding plate, so that the test data is more reliable; the above-mentioned settings improve the test accuracy of the test platform for the dynamic characteristics of the linear motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0022] Figure 1 This is a schematic diagram of the test platform structure of an embodiment of the utility model;

[0023] Figure 2 It is a schematic diagram of the top view of the test platform of an embodiment of the utility model;

[0024] Figure 3 Schematic diagram of a linear motor according to an embodiment of the utility model.

[0025] Among them, 1-base, 2-stator, 3-guide rail, 4-guide rail slider, 5-fixed steel plate, 6-support frame, 7-screw, 8-worm gear device, 9-coupling, 10-servo motor, 11-end flange, 12-force sensor, 13-sliding plate, 130-horizontal plate, 131-vertical plate. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] like Figure 1As shown, an embodiment of the utility model provides a linear motor dynamic characteristics test platform, including a linear motor, wherein the linear motor includes a base 1, a stator 2 and a mover, the stator 2 is fixedly arranged in a groove of the base 1, and the mover is movably sleeved on the outer side of the stator 2; a sliding plate 13 is fixedly arranged on the top of the mover, and a force sensor 12 is fixedly arranged on the sliding plate 13; a fixed steel plate 5 is fixedly arranged above one end of the base 1, a lead screw 7 is inserted through the fixed steel plate 5, one end of the lead screw 7 passes through a worm gear device 8 and extends to the outside of the worm gear device 8, the worm gear device 8 is connected to a servo motor 10 through a coupling 9, and an end flange 11 is fixedly arranged on the other end of the lead screw 7, and the movement of the lead screw 7 drives the end flange 11 to abut against the force sensor 12.

[0028] In this embodiment, if Figure 3 As shown, the base 1 is a U-shaped structure as a whole, with a groove, the motor stator 2 is fixedly arranged inside the groove, and the mover is sleeved on the outside of the stator 2 and moves above the stator 2. The mover is a magnet, and the stator 2 is a coil winding, that is, after the linear motor is powered on, the stator 2 generates a magnetic field, so that the mover moves in the groove of the base 1. It should be noted that the linear motor including the base 1, the stator 2 and the mover in this embodiment is an existing device, and its working principle is the existing technology, wherein the moving principle and process of the mover will not be described in detail here.

[0029] A support frame 6 is fixedly provided on the outside of one end of the base 1. The support frame 6 is a U-shaped structure as a whole, which is sleeved on the outside of the end of the base 1 and fixedly connected to the fixed steel plate 5 to provide necessary support for the base 1, ensure the stability and firmness of the entire test platform, and prevent shaking or displacement. The setting of the support frame 6 also improves the strength of the base 1, facilitates the fixing of the fixed steel plate 5 on the base 1, and provides support force for it, improves the stability of the fixed steel plate 5, and then improves the stability of the screw moving system.

[0030] like Figure 2 As shown, guide rails 3 are fixedly provided on both sides of the top of the base 1, and two guide rail sliders 4 are slidably provided on the guide rails 3 on each side, that is, there are four guide rail sliders 4 on the slide rails on both sides of the base 1. The sliding plate 13 is fixedly provided on the top of the mover and extends a certain distance on both sides of the mover, that is, the width of the sliding plate 13 is greater than the width of the mover. The sliding plate 13 is located between the guide rail sliders 4, and the guide rail sliders 4 on each side of the guide rail 3 are respectively fixed at the corresponding positions of the sliding plate 13, that is, the four guide rail sliders 4 are respectively fixed at the four corners of the sliding plate 13. The guide rail sliders 4 match on the guide rails 3 to perform sliding motion, and the guide rail sliders 4 are fixedly connected to the sliding plate 13. When the sliding plate 13 slides, the friction resistance is reduced by the guide rail sliders 4, so that the movement of the sliding plate 13 is smoother, thereby making the movement of the linear motor smoother.

[0031] In some embodiments, the base 1 is a marble base. Other materials may also be used, and can be flexibly configured according to actual conditions.

[0032] In this embodiment, the lead screw 7, the worm gear device 8, the end flange 11 and the servo motor 10 constitute a lead screw moving system, which converts the rotational motion of the servo motor 10 into the linear motion of the lead screw 7, so that the linear motion of the lead screw 7 is consistent with the motion direction of the sliding plate 13 (or the mover), and the motion speed and progress can be accurately controlled by the servo motor 10.

[0033] like Figure 1 , Figure 2 As shown, the worm gear device 8 includes a worm wheel and a worm that mesh with each other. The lead screw 7 is fixed on the top of the base 1 through the fixed steel plate 5 at one end of the base 1. One end of the lead screw 7 passes through the fixed steel plate 5 and extends to the outside of the worm gear device 8 through the center hole of the worm wheel. The worm of the worm gear device 8 is connected to the output shaft of the servo motor 10 through the coupling 9. The other end of the lead screw 7 is fixedly connected with an end flange 11. The outer periphery of the lead screw 7 is provided with a thread, which is screwed with the center hole of the worm wheel. When the servo motor 10 is started, the worm is driven to rotate, the worm drives the worm wheel to rotate, and the rotation of the worm wheel drives the lead screw 7 to move linearly.

[0034] The length of the lead screw 7 is equal to that of the linear motor, and the movement of the lead screw 7 drives the end flange 11 to move linearly above the base 1 to test the dynamic thrust of the linear motor. The lead screw 7 is fixed to the base 1 through the fixed steel plate 5, ensuring that the sliding plate 13 does not move relative to each other during force measurement.

[0035] In some implementations, the worm gear device 8 may adopt a worm gear reducer, which may be flexibly selected according to actual conditions and is not specifically limited in this embodiment.

[0036] In this embodiment, the linear motor includes a base 1, a stator 2 and a mover, wherein the stator 2 is fixedly arranged in a groove of the base 1, and a mover is provided on a movable sleeve outside the stator 2. The mover is fixedly connected to the sliding plate 13, and the stator 2 is fixedly connected to the stator connection block, which refers to a slide groove in the groove of the base, and is a connection device for fixing the stator in the groove.

[0037] A position sensor is fixedly installed below the side of the mover, and a corresponding magnetic grid channel is provided on the inner wall edge of the stator 2. The position sensor can read the position information of the sliding plate 13 fixed above the mover in real time to record the position at the moment of measuring dynamic thrust.

[0038] like Figure 3As shown, the sliding plate 13 includes a horizontal plate 130 and a vertical plate 131, which are vertically connected to each other. A force sensor 12 is fixedly arranged on a side wall of the vertical plate 131 facing the lead screw 7. The force sensor 12 is located between the vertical plate 131 of the sliding plate 13 and the end flange 11 of the lead screw 7, and is used to measure the interaction force between the end flange 11 and the sliding plate 13, that is, to test the thrust of the linear motor.

[0039] In some embodiments, both the horizontal plate and the vertical plate are rectangular structures, which can be flexibly arranged according to actual conditions without specific limitation.

[0040] In another embodiment, when the sliding plate 13 moves to the right, the force sensor 12 can be fixedly connected to the end flange 11 of the lead screw 7 on one side and fixedly connected to the sliding plate 13 on the other side to measure the rightward pulling force of the linear motor.

[0041] In some embodiments, the force sensor 12 is fixedly connected to the sliding plate 13 through mechanical parts (such as nuts, bolts and other mechanical parts); the end flange 11 is a circular flange. It can be flexibly set according to actual conditions and is not specifically limited in this embodiment.

[0042] Working principle details:

[0043] By setting up a screw moving system, the servo motor's rotational motion is converted into linear motion, making it consistent with the motion direction of the linear motor to be tested, and the servo motor can accurately control the speed and progress of the screw. Figure 1 , 2 As shown, the servo motor controls the speed to make the lead screw move from right to left at a uniform speed. When the linear motor is powered on, the actuator drives the sliding plate to move from right to left. Since the sliding plate is accelerating, but is supported by the end flange connected to the lead screw, the sliding plate can only move at a uniform speed along with the lead screw. When the two move at a uniform speed, the external force is balanced. The interaction force between the end flange and the sliding plate is the dynamic thrust. Since a force sensor is fixed on the side of the sliding plate facing the end flange, the force sensor between the two is used for measurement. The dynamic thrust at different speeds can be measured by controlling the servo motor. Among them, the function of the servo motor is to make the lead screw move at a uniform speed in a straight line.

[0044] The force sensor feeds the thrust value tested to the signal amplifier and digital display instrument, which can realize the test of the dynamic thrust of the linear motor. At the same time, the back electromotive force of the linear motor in uniform motion can be tested through an oscilloscope. During the test, zero current excitation is applied to the linear motor, and the servo motor drives the mover to move at a uniform speed. The back electromotive force waveform of the linear motor in uniform motion is tested through an oscilloscope.

[0045] When the lead screw is fixed, the linear motor is energized, and the sliding plate is subjected to a force to the left. At this time, the static thrust is measured.

[0046] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A linear motor dynamic characteristics test platform, comprising a linear motor, the linear motor comprising a base, a stator and a mover, the stator being fixedly arranged in a groove of the base, and a mover being arranged on a movable sleeve outside the stator, characterized in that: A sliding plate is fixedly provided on the top of the mover, and a force sensor is fixedly provided on the sliding plate; a fixed steel plate is fixedly provided above one end of the base, and a lead screw is inserted through the fixed steel plate, one end of the lead screw passes through the worm gear device and extends to the outside of the worm gear device, and the worm gear device is connected to the servo motor through a coupling, and an end flange is fixedly provided on the other end of the lead screw, and the movement of the lead screw drives the end flange to abut against the force sensor.

2. A linear motor dynamic characteristics test platform as claimed in claim 1, characterized in that: A support frame is fixedly arranged on the outer side of one end of the base, and the support frame is sleeved on the outer side of the end portion of the base and fixedly connected to the fixed steel plate.

3. A linear motor dynamic characteristics test platform as claimed in claim 1, characterized in that: Guide rails are fixedly arranged on both sides of the top of the base, and two guide rail sliders are slidably arranged on the guide rails on each side.

4. A linear motor dynamic characteristics test platform as claimed in claim 3, characterized in that: The sliding plate is located between the guide rail sliders and is fixedly connected to the guide rail sliders.

5. A linear motor dynamic characteristics test platform as claimed in claim 1, characterized in that: The worm gear device includes a worm wheel and a worm which mesh with each other.

6. A linear motor dynamic characteristics test platform as claimed in claim 5, characterized in that: A lead screw penetrates through the center hole of the worm wheel.

7. A linear motor dynamic characteristics test platform as claimed in claim 6, characterized in that: The outer periphery of the lead screw is provided with threads which are screwed to the center hole of the worm wheel.

8. A linear motor dynamic characteristics test platform as claimed in claim 5, characterized in that: The worm is connected to the output shaft of the servo motor through a coupling.

9. A linear motor dynamic characteristics test platform as claimed in claim 1, characterized in that: A position sensor is fixedly installed below the side of the mover.

10. A linear motor dynamic characteristics test platform as claimed in claim 1, characterized in that: The sliding plate comprises a transverse plate and a vertical plate which are vertically connected, and a force sensor is fixedly arranged on a side of the vertical plate which faces the lead screw.

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