Stepping motor working torque testboard

Abstract

The utility model relates to a stepping motor working torque testboard which comprises an assembly test part, a driving heating part used for controlling test temperature, and a stepping motor frequency conversion control part. The assembly testing part comprises a torque testing scale, a torque testing table, a stepping motor metal pressing plate and an assembly fixing table; the assembly fixing table is fixed on the end side of the torque testing scale, the torque testing table is fixed on the stress surface of the torque testing scale, and a stepping motor to be tested is fixed on an extension arm of the assembly fixing table through the stepping motor metal pressing plate; the stepping motor, the torque test bench and the torque test scale are sequentially arranged in the longitudinal direction, and the position setting meets the condition that when the stepping motor frequency conversion control part controls the stepping motor to work, the motor extends out of a conical head to be aligned with the torque test bench to transmit impact force to the torque test scale. Compared with the prior art, the testing device can meet the requirements of accurate and convenient testing of the working torque of the stepping motor under different frequencies and different environment temperatures.

Description

Technical Field

[0001] The utility model relates to the field of motor testing, in particular to a stepping motor working torque test bench. Background Art

[0002] With the rapid development of society, the maturity of motorcycle manufacturing technology, and the continuous improvement of international and domestic emission standards, motorcycles have also been upgraded from carburetors to electronic fuel injection control systems (ECUs). Based on the parameters of each sensor, the ECU accurately calculates the amount of oil and gas required by the engine under each operating condition, and injects the required injection amount and ignition advance angle into the intake duct through the injector. In order for the ECU to achieve these controls, various corresponding sensors and components are indispensable, among which the sensors at the engine intake and injection ends are particularly important. For example, the function of the stepper motor is to achieve precise adjustment of the air flow by accurately adjusting the area of ​​the interception channel of the bypass airway of the throttle body, so that the engine idle speed is consistent with the set expected idle speed.

[0003] The stepper motor is mounted on the throttle body. The number of steps of the commonly used stepper motor is about 0-200 steps. The larger the number of steps, the larger the corresponding gas volume. The stepper motor itself has no feedback signal. The ECU sends a control command to drive. Whether the required number of steps is reached is not recognized by the ECU, so the motor inevitably loses steps. There are many reasons that affect the motor's step loss, the most important of which is that the motor itself does not have enough working torque and is not able to drive the load.

[0004] In view of the phenomenon that the motor working torque is insufficient, it is urgent to design a stepper motor working torque test bench that can meet the requirements of driving at different frequencies and different ambient temperatures. Summary of the invention

[0005] The purpose of the utility model is to provide a stepper motor working torque test bench to overcome the defects of the above-mentioned prior art, which can meet the driving test requirements at different frequencies and different ambient temperatures.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A stepper motor working torque test bench comprises an assembly test section, a driving and heating section for controlling the test temperature, and a stepper motor frequency conversion control section;

[0008] The assembly test section includes a torque test scale, a torque test bench, a stepper motor metal pressure plate and an assembly fixing table; the assembly fixing table is fixed on the end side of the torque test scale, the torque test bench is fixed on the force-bearing surface of the torque test scale, and the stepper motor to be tested is fixed on the extended arm of the assembly fixing table through the stepper motor metal pressure plate; the stepper motor, the torque test bench and the torque test scale are arranged in sequence in the longitudinal direction, and the position setting satisfies: when the stepper motor frequency conversion control section controls the stepper motor to work, the stepper motor extends a cone head to align with the torque test bench to transmit impact force to the torque test scale.

[0009] Preferably, the torque test scale is an electronic scale with a zero reset function and meets the accuracy requirements; a weighing sensor is arranged inside the torque test scale, a strain gauge is pasted on the surface of the weighing sensor, and the force-bearing end of the weighing sensor is processed with a mounting hole that cooperates with a bolt to fix the assembly fixing platform.

[0010] Preferably, the extending arm is provided with a U-shaped opening on the end side away from the main body of the assembly fixing platform, the opening of which faces the direction away from the main body of the assembly fixing platform, for loading the stepping motor to be tested from the end side.

[0011] Preferably, a stepper motor mounting and positioning sink is provided at the innermost side of the U-shaped opening in the extending arm.

[0012] Preferably, the stepper motor metal pressing plate is a single-side opening structure, and when the stepper motor is fixed, the opening direction of the stepper motor metal pressing plate is perpendicular to the opening direction of the U-shaped opening.

[0013] Preferably, the torque test bench is provided with a cone head positioning transverse groove adapted to the shape of the cone head extending from the motor, and the shape of the cone head positioning transverse groove is adapted to the shape of the cone head extending from the motor.

[0014] Preferably, the torque test bench is an integrated molded structure with a cavity, and a through long strip opening is provided on the top surface of the integrated molded structure, which is used to clamp the cone head and drive the torque test bench to be forced upward when the cone head of the stepper motor is retracted, so as to measure the working torque when the cone head of the stepper motor is retracted;

[0015] The width of the strip opening satisfies the following requirements: it does not interfere with the screw rod of the stepper motor entering the cavity from the end of the strip opening, and the cone head of the stepper motor cannot be retracted vertically out of the cavity.

[0016] Preferably, the stepper motor frequency conversion control unit comprises a frequency conversion driver connected to the stepper motor wiring harness, and the frequency conversion driver is provided with forward and backward drive buttons and a frequency adjustment knob.

[0017] Preferably, the driving heating part comprises a heating coil, a temperature probe and a heating controller; the temperature probe and the heating controller constitute a temperature control module.

[0018] Preferably, the heating coil is a frame-type structure, which is sleeved above the extending arm of the assembly fixing platform, and the inner cavity formed by the heating coil is satisfied with not interfering with the stepping motor.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] 1) The assembly test part and the drive heating part of the utility model are arranged in sequence in the longitudinal direction through the stepper motor, the torque test bench and the torque test scale. When testing the stepper motor, the motor extends the cone head to align with the torque test bench to transmit the impact force to the torque test scale, which can realize the accurate, efficient and convenient working torque test of the stepper motor at different driving frequencies and ambient temperatures, can meet the drive test of different types of stepper motors, and has the advantages of simple operation, convenient installation and low cost.

[0021] 2) A stepper motor installation positioning sink is set on the extended arm of the assembly fixing table. Combined with the stepper motor metal pressure plate locking, the stepper motor can be accurately and firmly fixed to prevent displacement during testing that affects the accuracy of the measurement results.

[0022] 3) The cone head positioning transverse groove of the utility model can, on the one hand, realize the precise positioning of the cone head when the stepper motor is extended, thereby improving the convenience and efficiency of the test; on the other hand, it can also test the working torque when the stepper motor retracts the cone head. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural diagram of the stepping motor working torque test bench of the utility model;

[0024] Figure 2 This is a plan view of the stepper motor working torque test bench of the utility model; wherein (a), (b), and (c) correspond to the front view, the left view, and the top view, respectively;

[0025] Figure 3 This is a partially enlarged schematic diagram of the torque test bench and the torque test scale;

[0026] Figure 4 This is a schematic diagram of the structure of the positioning sinker for the stepping motor installation;

[0027] Figure 5 This is a schematic diagram of the metal pressure plate of the stepper motor;

[0028] Figure 6 Schematic diagram of the torque test bench structure; (a) is a three-dimensional diagram, and (b) is a cross-sectional diagram after the stepper motor is assembled;

[0029] Figure 7 This is a schematic diagram of the internal connection of the driving heating unit;

[0030] Figure 8 It is the schematic diagram of the strain gauge force;

[0031] Fig. 9 It is the working principle circuit of the torque test scale;

[0032] Figure markings: 1-torque test scale, 11-weighing sensor, 12-strain gauge, 13-fixing bolt; 2-torque test table, 21-cone head positioning transverse groove, 22-long strip opening; 3-stepping motor metal pressure plate; 4-assembly fixing table, 41-extending arm, 42-stepping motor installation positioning sinker; 5-temperature probe; 6-heating coil; 7-heating controller. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0034] Example

[0035] like Figure 1 and Figure 2 As shown, this embodiment provides a stepper motor working torque test bench, including an assembly test section, a driving and heating section for controlling the test temperature, and a stepper motor frequency conversion control section;

[0036] The assembly test part includes a torque test scale 1, a torque test bench 2, a stepper motor metal pressure plate 3 and an assembly fixing table 4; the assembly fixing table 4 is fixed on the end side of the torque test scale 1, the torque test bench 2 is fixed on the force-bearing surface of the torque test scale 1, and the stepper motor to be tested is fixed on the extended arm 41 of the assembly fixing table 4 through the stepper motor metal pressure plate 3; the stepper motor, the torque test bench 2 and the torque test scale 1 are arranged in sequence in the longitudinal direction, and the position setting satisfies: when the stepper motor is working, the motor extends the cone head to align with the torque test bench 2 to transmit the impact force to the torque test scale 1.

[0037] Next, various components of the test bench in this embodiment are introduced in detail.

[0038] 1. Torque test scale

[0039] The torque test scale 1 uses a common high-precision scale on the market with a zero reset function. This embodiment uses a Kaifeng X5-S electronic scale. The torque test table 2 and the assembly fixing table 4 are metal parts, which are manufactured by processing.

[0040] like Figure 3 and Figure 8 As shown, a load cell 11 is provided in the torque test scale 1, a strain gauge 12 is pasted on the surface of the load cell 11, and a mounting hole is processed at the force-bearing end of the load cell 11 to cooperate with a fixing bolt 13 to fix the assembly fixing platform 4. During assembly, the housing of the torque test scale 1 is removed, and the torque test platform 2 and the assembly fixing platform 4 are installed on the torque test scale 1 by bolts.

[0041] When the motor cone extends forward or backward, the motor extends the cone head to align with the torque test bench 2 to transmit the impact force to the torque test scale 1, causing the strain gauge 12 to deform. When the strain gauge 12 is deformed, its resistance changes, the circuit balance is broken and a small voltage is generated, and then the force analog signal is converted into a digital signal through the built-in amplifier circuit. The working principle circuit of the torque test scale is as follows Fig. 9 shown.

[0042] 2. Assembly fixed table

[0043] like Figure 4 As shown, the extension arm 41 of the assembly fixing platform 4 is provided with a U-shaped opening facing away from the main body of the assembly fixing platform 4 at the end side away from the main body of the assembly fixing platform 4, which is used to load the stepper motor to be tested from the end side. The innermost side of the U-shaped opening in the extension arm 41 is provided with a stepper motor installation positioning sink 42.

[0044] 3. Stepper motor metal plate

[0045] like Figure 5 As shown, the stepper motor metal pressing plate 3 is a single-side opening structure. When the stepper motor is fixed, the opening direction of the stepper motor metal pressing plate 3 is perpendicular to the opening direction of the U-shaped opening.

[0046] 4. Torque test bench

[0047] like Figure 6 As shown, the torque test bench 2 is provided with a cone head positioning transverse groove 21 adapted to the shape of the protruding cone head of the motor, and the shape of the cone head positioning transverse groove 21 is adapted to the shape of the protruding cone head of the motor.

[0048] The torque test bench 2 is an integrated molded structure with a cavity. The top surface of the integrated molded structure is provided with a through long strip opening 22, which is used to clamp the cone head and drive the torque test bench 2 to be forced upward when the stepper motor reverses and retracts the cone head, so as to measure the working torque when the stepper motor retracts the cone head;

[0049] The width of the strip opening 22 satisfies the following requirements: it does not interfere with the stepper motor's lead screw entering the cavity from the end of the strip opening, it does not restrict the stepper motor's lead screw from extending and retracting, and the stepper motor's cone head cannot be retracted vertically out of the cavity.

[0050] The width of the horizontal groove at the bottom of the torque test bench 2 is larger than the size of the top of the stepper motor cone head. The cone head is similar in shape to a truncated cone, and the top edge of the cone head has a chamfer. The cone head positioning horizontal groove 21 is used to prevent the stepper motor cone head from offsetting after it presses against the torque test bench 2, which will cause the cone head force to be unable to be concentrated at the center point of the torque test bench 2. The stepper motor is extended and retracted by a lead screw, which is connected to the cone head by a thread.

[0051] 5. Stepper motor frequency conversion control unit

[0052] The stepper motor frequency conversion control unit also includes a frequency conversion driver connected to the stepper motor wiring harness, and the frequency conversion driver is provided with front and rear drive buttons and a frequency adjustment knob.

[0053] 6. Drive heating unit

[0054] like Figure 7 As shown, the driving heating unit includes a heating coil 6, a temperature probe 5 and a heating controller 7, and the temperature probe 5 and the heating controller 7 constitute a temperature control module. Further, the heating coil 6 is a frame structure, such as Figure 1 As shown, it can be mounted on the extended arm of the assembly fixing platform 4, and the inner cavity formed by the heating coil 6 satisfies the requirement of not interfering with the stepping motor.

[0055] During the normal temperature test, the opening at the end of the extended arm is used to slide the stepper motor into the stepper motor installation positioning sink corresponding to the assembly fixing platform 4, and the stepper motor metal pressure plate 3 is installed and the bolts are locked. The stepper motor is connected to the variable frequency drive through the corresponding connector. The variable frequency drive adjusts the driving frequency and the forward and reverse rotation of the stepper motor. The frequency is related to the torque of the stepper motor. Press the forward button of the variable frequency drive, and the stepper motor extends the cone head to support the torque test bench 2. Since the motor cone head has not reached the maximum extension stroke at this time, the motor cone head has a downward extension force that continuously impacts the torque test bench 2. The torque test bench 2 is fixed on the weighing sensor 11. The continuous impact force acts through the torque test bench and is transmitted to the strain gauge 12 on the surface of the weighing sensor 11. After the strain gauge 12 on the weighing sensor 11 is deformed, the pressure sensor collects the impact force, and converts the analog signal of the impact force into the digital signal required for the standard kilogram through the ADC circuit, and the value is output by the display screen of the torque test scale 1. On the contrary, when the reverse button on the frequency converter is pressed, the stepper motor reverses and retracts the cone head to pull the torque test bench 2. After the strain gauge 12 on the surface of the weighing sensor 11 is deformed, the analog signal of the impact force is converted into a digital signal required for the standard kilograms through the ADC, and the value is output by the display screen.

[0056] During high temperature testing, the installation is the same as that of normal temperature testing. The heating coil 6 is framed on the assembly fixing table 4, and the temperature probe 5 is placed on the edge of the coil wall (it can be hung on it). The heating coil 6 is connected to the heating controller 7 through the corresponding connector. The heating knob of the heating controller 7 can be rotated to the predetermined temperature scale. When the temperature is reached, the heating will stop. When the temperature is lower than the predetermined temperature, the heating will be reheated and the cycle will be repeated. The stepper motor will lose steps when it is heated, which is a manifestation of the decrease in working torque. This heating coil part can simulate different ambient temperature conditions of the stepper motor in actual use. The high temperature drive and normal temperature drive operations are the same. Both drive the telescopic cone head of the stepper motor to act on the torque test bench to the weighing sensor, so that the weighing sensor and the strain gauge 12 are deformed, and the analog signal of the impact force is converted into the digital signal required for the standard kilograms through the ADC circuit, and the digital signal is output by the display screen.

[0057] In this embodiment, the parameters of the stepper motor to be tested are as follows: when the telescopic torque is 200 pps, the driving torque standard is: 2 kgf.cm=0.196 Nm, the step amplitude is 0.0417 mm±0.0063 mm, and the maximum stroke is 240 pps.

[0058] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A stepper motor working torque test bench, characterized in that: It includes an assembly test section, a driving and heating section for controlling the test temperature, and a stepping motor frequency conversion control section; The assembly test section comprises a torque test scale (1), a torque test bench (2), a stepper motor metal pressure plate (3) and an assembly fixing table (4); the assembly fixing table (4) is fixed to the end side of the torque test scale (1), the torque test bench (2) is fixed to the force-bearing surface of the torque test scale (1), and the stepper motor to be tested is fixed to the extended arm (41) of the assembly fixing table (4) through the stepper motor metal pressure plate (3); the stepper motor, the torque test bench (2) and the torque test scale (1) are arranged in sequence in the longitudinal direction, and the position arrangement satisfies that when the stepper motor frequency conversion control section controls the stepper motor to work, the stepper motor extends a cone head to align with the torque test bench (2) to transmit the impact force to the torque test scale (1).

2. A stepper motor working torque test bench according to claim 1, characterized in that: The torque test scale (1) is an electronic scale with a zero reset function and meets the accuracy requirements; a weighing sensor (11) is arranged inside the torque test scale (1), a strain gauge (12) is attached to the surface of the weighing sensor (11), and a mounting hole is processed at the force-bearing end of the weighing sensor (11) for cooperating with a bolt to fix the assembly fixing platform (4).

3. A stepper motor working torque test bench according to claim 1, characterized in that: The end side of the extending arm (41) away from the main body of the assembly fixing platform (4) is provided with a U-shaped opening with its opening facing away from the main body of the assembly fixing platform (4), and is used for loading the stepping motor to be tested from the end side.

4. A stepper motor working torque test bench according to claim 1, characterized in that: A stepping motor installation positioning sink (42) is arranged at the innermost side of the U-shaped opening in the extending arm (41).

5. A stepper motor working torque test bench according to claim 4, characterized in that: The stepper motor metal pressing plate (3) is a single-side opening structure. When the stepper motor is fixed, the opening direction of the stepper motor metal pressing plate (3) is perpendicular to the opening direction of the U-shaped opening.

6. A stepper motor working torque test bench according to claim 1, characterized in that: The torque test bench (2) is provided with a cone head positioning transverse groove (21) adapted to the shape of the protruding cone head of the motor, and the shape of the cone head positioning transverse groove (21) is adapted to the shape of the protruding cone head of the motor.

7. A stepper motor working torque test bench according to claim 1, characterized in that: The torque test bench (2) is an integrated molded structure with a cavity, and a through-going long strip opening (22) is provided on the top surface of the integrated molded structure, which is used to clamp the cone head and drive the torque test bench (2) to be forced upward when the cone head of the stepper motor is retracted, so as to measure the working torque when the cone head of the stepper motor is retracted; The width of the long strip opening (22) satisfies the following requirements: it does not interfere with the screw rod of the stepping motor entering the cavity from the end of the long strip opening, and the cone head of the stepping motor cannot be vertically retracted out of the cavity.

8. The stepper motor working torque test bench according to claim 1, characterized in that: The stepper motor frequency conversion control unit comprises a frequency conversion driver connected to the stepper motor wiring harness, and the frequency conversion driver is provided with front and rear drive buttons and a frequency adjustment knob.

9. A stepper motor working torque test bench according to claim 1, characterized in that: The driving heating unit comprises a heating coil (6), a temperature probe (5) and a heating controller; the temperature probe (5) and the heating controller form a temperature control module.

10. A stepper motor working torque test bench according to claim 9, characterized in that: The heating coil (6) is a frame-type structure and is sleeved above the extended arm of the assembly fixing platform (4). The inner cavity formed by the heating coil (6) is sufficient to not interfere with the stepping motor.

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