Reversing starting test device for direct current brush motor

Abstract

The utility model discloses a commutation starting testing device for a DC brush motor, which comprises a motor to be detected, a rotating device and a PWM modulation voltage control device, the motor to be detected comprises a positive terminal, a negative terminal and a rotating shaft, the rotating shaft is provided with a magnetic induction coil, and the motor to be detected is provided with a stator matched with the magnetic induction coil; a commutator is arranged at the position, located at the upper end of the magnetic induction coil, of the rotating shaft, the commutator is provided with an electric brush matched with the commutator, the two ends, provided with the electric brush, of the electric brush are connected with the positive terminal and the negative terminal respectively, the rotating device is connected with the rotating end of the rotating shaft, and the rotating device is used for driving the rotating shaft to rotate by a preset angle and clamping and fixing the rotating shaft. The PWM modulation voltage control device is respectively connected with the positive terminal and the negative terminal, and is used for controlling the output waveform and the preset amplitude of the modulation voltage which is output, obtaining the consumption value of the output current and generating a comparison waveform.

Description

TECHNICAL FIELD

[0001] The utility model relates to a brush motor test equipment field, especially in a kind of commutating starting test device for DC brush motor. BACKGROUND

[0002] DC brush motor in use, while motor rotates, an electromotive force voltage opposite to voltage is generated, and this electromotive force voltage is called back electromotive force.

[0003] The generation of back electromotive force can cause serious sparking when commutator switches current, which can affect the performance of the motor and may not meet the predetermined rotation accuracy control requirements. Therefore, to reduce this back electromotive force, the voltage is consumed, which can reduce the generation of sparks. The existing method is generally to install a pressure-sensitive resistor on the commutator of the armature core.

[0004] But the pressure-sensitive resistor is a relatively fragile component, which is prone to cracking during production, and it is difficult to distinguish from appearance, so it is difficult to determine whether it meets the rotation accuracy requirements.

[0005] For example, the existing Chinese patent 202321421516.4 designs an induction brush to solve the electromotive force voltage, but the structure is relatively complex. CONTENT OF UTILITY MODEL

[0006] The main purpose of the utility model is to provide a commutating starting test device for DC brush motor, which is designed to consume electric energy by using pressure-sensitive resistor, and to drive motor by using PWM modulation voltage control device, to monitor the change of PWM average voltage, and to judge the quality of pressure-sensitive resistor.

[0007] To achieve the above purpose, the utility model provides a commutating starting test device for DC brush motor, comprising:

[0008] The motor to be detected includes a positive terminal, a negative terminal and a rotating shaft, the rotating shaft is provided with a magnetic sensing coil, the motor to be detected is provided with a stator matched with the magnetic sensing coil, and the motor to be detected is fixed on the clamp;

[0009] The rotating shaft is provided with a commutator at the upper end of the magnetic sensing coil, the commutator is provided with a matched brush, and the two ends of the brush are connected with the positive terminal and the negative terminal respectively;

[0010] Rotary device, the rotary device is connected with the rotating end of rotating shaft, and the rotary device drives the rotating shaft to rotate by a predetermined angle and clamps and fixes;

[0011] The PWM modulation voltage control device is connected with the positive terminal and the negative terminal respectively, and is used for controlling the output waveform and the predetermined amplitude of the modulation voltage of the control output, obtaining the consumption value of the output current and generating a comparison waveform;

[0012] When the average consumption value of the pressure sensitive resistor meets the predetermined requirement, the comparison waveform is consistent with the output waveform;

[0013] When the average consumption value of the pressure sensitive resistor does not meet the predetermined requirement, the average value of the comparison waveform is greater than the output waveform.

[0014] In actual design, the PWM modulation voltage control device is prior art, that is, the current voltage of the control output is predetermined, and whether the output current voltage meets the requirement is monitored;

[0015] When testing is needed, the rotating device can be understood as fixing the rotating shaft, so that the output current consumed by the pressure sensitive resistor is the same as the predetermined waveform when the rotating shaft is clamped and fixed, and the output current is greater than or less than the predetermined value when the pressure sensitive resistor is damaged, so that the dead point of the commutator can be judged;

[0016] However, in actual testing, the rotating device can rotate with the predetermined rotating speed, and the output waveform of the corresponding PWM modulation voltage control device has a predetermined waveform with the rotating speed, so that the comparison waveform can be recorded to judge the dead point position of the commutator;

[0017] The structure is simple, and has good reference model significance, and effectively solves the blind area of the existing pressure sensitive resistor detection.

[0018] The utility model has the advantages of:

[0019] 1. The blank position of the duty ratio and the pressure sensitive characteristic are ingeniously and effectively utilized, and the reaction is collected on the change of the voltage.

[0020] 2. The low-cost and high-efficiency improvement mode improves product quality.

[0021] 3. The consistency of the product is ensured, and the satisfaction of the customer is improved. DRAWINGS

[0022] Figure 1 It is a schematic view of the utility model;

[0023] Figure 2 It is the cooperation relationship of the brush and the commutator;

[0024] Figure 3 It is a test Figure 1 ;

[0025] Figure 4 It is a testFigure 2 ;

[0026] Figure 5 To test Figure 3 .

[0027] In the figure,

[0028] 1 is an electric motor to be tested, 10 is a rotating shaft,

[0029] 2 is a commutator, 20 is a brush,

[0030] 3 is a rotating device, 30 is a PWM modulated voltage control device,

[0031] 100 is a clamp. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0034] In addition, if the embodiments of the present application involve descriptions of "first" or "second", etc., the descriptions of "first" or "second" are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of a person skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0035] As shown in Figures 1 to 4 A commutator starting test device for a DC brush motor, comprising:

[0036] The motor to be detected comprises a positive terminal, a negative terminal and a rotating shaft, the rotating shaft is provided with a magnetic induction coil, the motor to be detected is provided with a stator matched with the magnetic induction coil, and the motor to be detected is fixed to the clamp;

[0037] The upper end of the rotating shaft provided with the commutator is provided with a brush matched with the commutator, and the two ends of the brush are connected with the positive terminal and the negative terminal respectively;

[0038] The rotating device (wherein the rotating device can be provided with a clamp jaw for the rotating shaft to extend into, thereby driving the rotating shaft to rotate) is connected with the rotating end of the rotating shaft, and the rotating device drives the rotating shaft to rotate by a predetermined angle and is clamped and fixed;

[0039] The PWM modulation voltage control device is connected with the positive terminal and the negative terminal respectively, is used for controlling the output waveform and the predetermined amplitude of the output modulation voltage, and obtains the consumption value of the output current and generates a comparison waveform;

[0040] When the average consumption value of the piezoresistor meets the predetermined requirement, the comparison waveform is consistent with the output waveform;

[0041] When the average consumption value of the piezoresistor does not meet the predetermined requirement, the average value of the comparison waveform is greater than the output waveform.

[0042] In actual design, the PWM modulation voltage control device is a prior art, that is, the output current voltage is controlled and monitored whether the output current voltage meets the requirement;

[0043] When testing is required, it can be understood that the rotating device fixes the rotating shaft, and then the piezoresistor load requirement is met, and the output current consumed when the rotating shaft is clamped and fixed is the same as the predetermined waveform, when the piezoresistor is damaged, the output current is greater than or less than the predetermined value, and then the dead point of the commutator can be judged;

[0044] But in actual testing, the rotating device can rotate with a predetermined rotating speed, and then the output waveform of the corresponding PWM modulation voltage control device has a predetermined waveform with the rotating speed, so that the comparison waveform can be recorded to judge the dead point position of the commutator;

[0045] The structure is simple, and has good reference model significance, and effectively solves the blind area of the existing piezoresistor detection.

[0046] The advantages of the utility model are:

[0047] 1. The blank position of the duty ratio and the piezoresistance characteristic are ingeniously and effectively utilized, and the reaction is collected on the change of voltage.

[0048] 2. Low cost, high efficiency, improved way to improve product quality.

[0049] 3. Ensure product consistency, improve customer satisfaction.

[0050] In actual design, automatic detection can also be realized, and the motor can be placed on the jig, wherein the PWM modulation voltage control device connected with the electrode of the motor and the rotating device (or rotating device, the jig can realize positioning of the motor) are further included, and the PWM modulation voltage control device and the rotating device can be respectively arranged above and below the jig.

[0051] Specifically, the output current of the PWM modulation voltage control device is 0-5V.

[0052] Specifically, the rotating device is a servo rotating motor, wherein the driving end of the servo rotating motor is provided with a clamping structure.

[0053] In the embodiment of the utility model, the rotation angle of the rotating device is 1 degree.

[0054] Specifically, low voltage: DC 0-5V. When testing, the test method is: the rotating device rotates 1 degree each time, and the PWM modulation voltage control device is powered once, and whether there is a dead point between the brush and the rotor commutator is judged by the size of the current value; current waveform production, analysis and output.

[0055] Specifically, the rotating device rotates intermittently or at a predetermined speed for a predetermined angle.

[0056] In the embodiment of the utility model, the consumption value of the current is used to judge the contact state and breakpoint phenomenon of the brush and the commutator, and when the pressure sensitive resistance between the brush and the commutator is less than the predetermined value during actual driving, the corresponding waveforms do not appear.

[0057] Specifically, the waveform is a column chart, for example, when rotating intermittently, a column chart can be used.

[0058] In the embodiment of the utility model, the waveform is a wave chart, and different actual detections are used, for example, a wave chart can be used when rotating continuously.

[0059] The modulation voltage is 15KHZ 15% duty cycle.

[0060] If 30V electric modulation is used, the average voltage is 4.5V.

[0061] After matching the pressure sensitive resistor, the back electromotive force of the motor is suppressed, and the waveform is basically consistent with the modulation voltage. Figure 3

[0062] Figure 4 ​​, the average voltage of the power supply PWM 15% waveform test will be higher than the modulated PT voltage, and the current will be lower.

[0063] As Figure 5 , the power supply PWM 15% waveform DV after the rupture cannot offset the back electromotive force voltage, so that the current will be higher.

[0064] If the current suddenly becomes small or there is no current at a certain angle, it indicates that the tested motor has poor contact or no contact at that point. In the case of such a state, if the motor stops at that position when driving the motor, the motor cannot be started due to poor contact. The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation or direct / indirect application in other related technical fields within the scope of the present application is included in the patent protection scope of the present application.

Claims

1. A commutation start-up test device for a DC brushed motor, characterized in that, include: The motor to be tested includes a positive terminal, a negative terminal, and a rotating shaft. The rotating shaft is equipped with a magnetic coil. The motor to be tested is equipped with a stator that cooperates with the magnetic coil. The motor to be tested is fixed to a fixture. The rotating shaft is located at the upper end of the magnetic induction coil and has a commutator. The commutator is equipped with a matching brush, and the two ends of the brush are respectively connected to the positive terminal and the negative terminal. A rotating device is connected to the rotating end of a rotating shaft, the rotating device being used to drive the rotating shaft to rotate by a predetermined angle and to clamp and fix it. A PWM modulation voltage control device is connected to the positive terminal and the negative terminal respectively, and is used to control the output waveform and predetermined amplitude of the modulation voltage of the control output, and to obtain the consumption value of the output current and generate a comparison waveform. When the average consumption value of the varistor meets the predetermined requirements, the comparison waveform matches the output waveform; When the average consumption value of the varistor does not meet the predetermined requirements, the average value of the comparison waveform is greater than the output waveform.

2. The commutation start test device for a DC brushed motor as described in claim 1, characterized in that: The output current of the PWM modulation voltage control device is 0-5V.

3. The commutation start test device for a DC brushed motor as described in claim 1, characterized in that: The rotating device is a servo rotary motor.

4. The commutation start test device for a DC brushed motor as described in claim 1, characterized in that: The rotation angle of the rotating device is 1 degree.

5. The commutation start test device for a DC brushed motor as described in claim 1, characterized in that: The rotating device rotates intermittently or rotates at a predetermined speed and by a predetermined angle.

6. The commutation start test device for a DC brushed motor as described in claim 1, characterized in that: The current consumption value is used to determine the contact status and breakage phenomenon of the brushes and commutator.

7. The commutation start test device for a DC brushed motor as described in claim 1, characterized in that: The waveform is a bar chart.

8. The commutation start test device for a DC brushed motor as described in claim 1, characterized in that: The waveform is a wave diagram.

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