Comprehensive test tool for low-voltage servo motor

Abstract

The invention relates to the field of motor testing, in particular to a comprehensive testing tool for a low-voltage servo motor. According to the invention, through an external PC terminal of the S1 driver and the S2 driver, the purpose of controlling the on-off of a circuit is realized through software written by the PC terminal, and the software detects basic motor parameters, including power, voltage, current, rotating speed, torque, counter electromotive force, rotational inertia, line resistance inductance, number of pole pairs, encoder type and the like, of the low-voltage servo motor when the low-voltage servo motor leaves a factory according to set values. Moreover, the number of devices used for testing is smaller, the testing steps are simple, the efficiency is higher, and the reliability is higher. The problems that multiple devices need to be adopted for the comprehensive testing process of an existing low-voltage servo motor, the steps are complex, the efficiency is low, and the reliability is difficult to guarantee are solved.

Description

Technical Field

[0001] The present invention relates to the field of motor testing, and specifically to a comprehensive testing tooling for low-voltage servo motors. Background Art

[0002] With the rapid development of intelligent manufacturing and related industries, there are increasingly high requirements for aspects such as the integration, miniaturization, precision, efficiency, and safety of servo systems. The application of low-voltage servo systems is becoming more and more extensive, and the market demand is increasing. At the same time, there are also higher requirements for the performance, reliability, and consistency of low-voltage servo motors. It is of great significance to quickly and effectively conduct a complete test on low-voltage servo motors and achieve full inspection of servo motors before leaving the factory.

[0003] In the existing comprehensive testing process of low-voltage servo motors, multiple devices are required. For example, a resistance and inductance testing instrument, a detection platform related to speed / torque / position are needed. Transfers are made according to different lead-out methods of low-voltage servo motors, and software is used to write the current loop gain, etc. The steps are numerous and the efficiency is low, and the reliability is difficult to guarantee. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a comprehensive testing tooling for low-voltage servo motors, which solves the problem that multiple devices are required in the existing comprehensive testing process of low-voltage servo motors, with numerous steps, low efficiency, and difficult-to-guarantee reliability.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A comprehensive testing tooling for low-voltage servo motors includes an AC output interface for accessing alternating current. This testing tooling further includes:

[0007] A switching power supply connected to the AC output interface. A middle relay and an opto-relay are respectively connected to the output of the switching power supply. An AC relay is connected to the middle relay. An S1 driver is connected between the AC relay and the opto-relay. An S2 driver whose power on and off are controlled by the S1 driver is also connected to the opto-relay. The S1 driver and the S2 driver perform data interaction with an external PC.

[0008] Preferably, the testing tooling further includes a leakage protector disposed between the switching power supply and the AC output interface. The live wire and neutral wire on the leakage protector are connected to the middle relay and then to the VCC port of the AC contactor.

[0009] Preferably, a fan is connected to the middle relay.

[0010] Preferably, a start button and an emergency stop button are sequentially connected between the AC output interface and the leakage protector. The live wire on the AC output interface passes through the start button and the emergency stop button and then the neutral wire is connected to the leakage protector.

[0011] Preferably, the S1 driver, the S2 driver and the switching power supply are connected to the housing ground PE.

[0012] Compared with the prior art, the present invention provides a comprehensive test tool for low-voltage servo motors, which has the following beneficial effects:

[0013] 1. In the present invention, the S1 driver and the S2 driver are connected to the external PC terminal, and the software written by the PC terminal is used to control the on-off of the circuit. The software detects the basic motor parameters of the low-voltage servo motor when leaving the factory according to the set values, including power, voltage, current, speed, torque, back electromotive force, moment of inertia, line resistance inductance, number of pole pairs, encoder type, etc. Moreover, fewer devices are used in the test, the test steps are simple, the efficiency is higher and the reliability is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings:

[0015] Figure 1 is the circuit schematic diagram of the present invention;

[0016] Figure 2 is the structural schematic diagram of the present invention;

[0017] Figure 3 is the flowchart of the use of the test tool of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific embodiments. Thereby, the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0019] Those of ordinary skill in the art can understand that all or part of the steps in the following embodiments can be completed by instructing relevant hardware through a program. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0020] To solve the problem that multiple devices are required in the comprehensive testing process of existing low-voltage servo motors, with complicated steps, low efficiency and difficult to guarantee reliability, the present invention provides a comprehensive testing tooling for low-voltage servo motors, including an AC output interface for accessing alternating current, such as Figure 1 and Figure 2 shown. The testing tooling further includes:

[0021] A switching power supply connected to the AC output interface. A middle relay and an opto-relay are respectively connected to the output of the switching power supply. The opto-relay is turned on by default at a low level. An AC relay is connected to the middle relay. An AC contactor is an automatic switching electrical appliance for connecting or disconnecting the main circuit of a motor or a load. It is an electrical appliance that uses electromagnetic force to close or open the switch. It is suitable for frequent operation and remote control of high-power circuits. An S1 driver is connected between the AC relay and the opto-relay. An S2 driver for controlling power on and off through the S1 driver is also connected to the opto-relay. The S1 driver and the S2 driver perform data interaction with an external PC. After the S1 driver is powered on, the control signals DO1 and DO2 default to output a high level. After the program starts, the output signal DO1 becomes low level to open the contact 1 of the opto-relay, and after a delay of 2 s, the output signal DO2 becomes low level to open the contact 2 of the opto-relay, enabling the S2 driver to be normally powered on.

[0022] The testing tooling also includes a leakage protector disposed between the switching power supply and the AC output interface. The live wire and the neutral wire on the leakage protector are connected to the middle relay and then to the VCC port of the AC contactor.

[0023] A fan is connected to the middle relay for cooling during the testing process. The power cord of the fan is connected to the positive and negative poles of the middle relay.

[0024] A start button and an emergency stop button are sequentially connected between the AC output interface and the leakage protector. The live wire on the AC output interface passes through the start button and the emergency stop button and then the neutral wire is connected to the leakage protector.

[0025] The shell ground PE is connected to the S1 driver, the S2 driver and the switching power supply.

[0026] The following further details the circuit connection method of the present invention:

[0027] (1) First, connect the live wire to the leakage protector through the emergency stop button and then connect it to the leakage protector together with the neutral wire.

[0028] (2) The live wire and the neutral wire passing through the leakage protector supply power to the switching power supply and are also connected to the contacts of the middle relay and the AC contactor.

[0029] (3) The first 48V path of the switching power supply passes through the start button and then returns to the VCC of the middle relay. The button controls the operation of the middle relay.

[0030] (4) The live wire and neutral wire from the leakage protector on the contact of the intermediate relay are connected to the VCC of the AC contactor through the contacts at the other end. In this way, when the intermediate relay works, the live wire and neutral wire of the contacts are connected, enabling the AC contactor to work.

[0031] (5) The second 48V of the switching power supply is connected to the contacts of the opto-relay through the contacts of the intermediate relay, and the 48V of the fan is connected to the output of the 48V contacts of the intermediate relay. When the start button is pressed, the S1 driver is powered on, the opto-relay contacts also have 48V power, and the fan starts to work.

[0032] (6) The 48V of the opto-relay is connected to the common contact of the first path, and the normally open contact of the first path is used to connect to the common contact of the second path, and then the normally open contact of the second path is connected to the main circuit control DC+ of the S2 driver. And a 20-ohm 5W resistor is connected in parallel between the common contact and the normally open contact of the second path.

[0033] (7) The 24V output after the S1 driver is powered on will be connected to the VCC of the opto-relay, so as to effectively control the input signal of the opto-relay. DO1+ and DO2+ respectively control the input 1 and input 2 of the opto-relay (corresponding to the closing of the normally open contacts of the first path and the second path).

[0034] (8) The S1 and S2 drivers communicate through the rs485 interface. The 485 signal of the S2 driver is converted into a USB signal and connected to the external PC. Through the software, commands such as powering on and off the two drivers and outputting instructions can be realized.

[0035] (9) Connect the PE shield ground network, switching power supply, driver, etc. together to form a protection circuit. Connect the 0V network to the corresponding driver and relay 0V network to form an effective power circuit.

[0036] (10) The RS485 is converted into a USB signal and connected to the PC. Through the software command, the S1 and S2 drivers are controlled to act. Modifying the parameters of the software code can test different low-voltage DC motors. When testing, as Figure 3 shown, the tooling is debugged. First, the software detects the basic motor parameters of the low-voltage servo motor when it leaves the factory according to the set values, including power, voltage, current, speed, torque, back electromotive force, moment of inertia, line resistance and inductance, number of pole pairs, encoder type, etc. Subsequently, the software identifies the mechanical angle of the motor of the low-voltage servo motor, starts to run the motor after obtaining the position information, runs at low speed and the highest speed, and tests the speed fluctuation error, which needs to be within the error range to be qualified.

[0037] The above embodiments have introduced the present invention in detail. Specific examples are used in this text to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation on the present invention.

Claims

1. A low voltage servo motor comprehensive test tool, including an AC output interface for connecting to AC power, characterized in that: The test fixture also includes: A switching power supply connected to the AC output interface has an intermediate relay and an optocoupler relay connected to its output, an AC relay connected to the intermediate relay, an S1 driver connected between the AC relay and the optocoupler relay, and an S2 driver connected to the optocoupler relay for controlling power on and off through the S1 driver. The S1 driver and the S2 driver exchange data with an external PC.

2. The test tool according to claim 1, characterized in that: The test fixture also includes a leakage protector arranged between the switching power supply and the AC output interface. The live and neutral wires on the leakage protector are connected to the intermediate relay and then connected to the VCC port of the AC contactor.

3. The test tool according to claim 2, characterized in that: The intermediate relay is connected with a fan.

4. The test tool according to claim 2, characterized in that: A start button and an emergency stop button are connected in sequence between the AC output interface and the leakage protector. The live wire on the AC output interface passes through the start button and the emergency stop button and then is connected to the leakage protector with the neutral wire.

5. The test tool according to claim 1, characterized in that: The S1 driver, the S2 driver and the switch power supply are connected to a housing ground PE.

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