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CN-121995214-A - Testing device of miniature stepping motor

CN121995214ACN 121995214 ACN121995214 ACN 121995214ACN-121995214-A

Abstract

The invention aims to provide a testing device of a miniature stepping motor. The micro-motor driving device comprises a motor driving plate, wherein the motor driving plate is connected with a micro-motor product through a signal switching module, the signal switching module comprises a signal switching plate and a pin point switching plate, the motor driving plate comprises a control module, the control module is connected with a signal communication module, a motor driving IC and a rotating speed acquisition circuit, the motor driving IC is connected with a power module, the motor driving plate is responsible for controlling and acquiring the work, working current voltage and rotating speed of the micro-motor product, the signal switching module is responsible for switching signals of the micro-motor product to the motor driving plate, and the power module is responsible for controlling the power voltage of the motor driving IC. The invention is applied to the technical field of stepper motor testing.

Inventors

  • XIONG ZHIYONG
  • WANG HAILAI
  • LI SHUANG
  • ZENG JINYAN
  • SU JIN

Assignees

  • 珠海市运泰利自动化设备有限公司

Dates

Publication Date
20260508
Application Date
20260310

Claims (7)

  1. 1. A testing device of a miniature stepping motor comprises a motor driving plate (1), wherein the motor driving plate (1) is connected with a micro motor product (3) through a signal switching module (2), the signal switching module (2) comprises a signal switching plate (4) and a needle switching plate (5), and is characterized in that the motor driving plate (1) comprises a control module (6), the control module (6) is connected with a signal communication module (7), a motor driving IC (8) and a rotating speed acquisition circuit (9), the motor driving IC (8) is connected with a power supply module (10), the motor driving plate (1) is responsible for controlling and acquiring the work, working current voltage and rotating speed of the micro motor product (3), the signal switching module (2) is responsible for switching signals of the micro motor product (3) to the motor driving plate (1), the power supply module (10) controls the power supply voltage of the motor driving IC (8), the signal communication module (7) transmits instructions of an upper computer to the control module (6), and the control module (6) is responsible for controlling and the UART (3) to read the rotating speed of the micro motor product (3).
  2. 2. The micro stepping motor testing device according to claim 1, wherein the signal communication module (7) comprises a UART chip (U902), the UART chip (U902) is connected with a TVS transient diode (U901), the TVS transient diode (U901) is connected with a USBMiniB interface (J901), the USBMiniB interface (J901) is connected with an upper computer, the UART chip (U902) is connected with a pi-type filter circuit, and the pi-type filter circuit comprises a first resistor (R914), a second resistor (R915), a first capacitor (C921), a second capacitor (C922), a third capacitor (C923) and a fourth capacitor (C924).
  3. 3. The device for testing the micro stepping motor according to claim 1, wherein the power module (10) comprises a first output module and a second output module, the first output module supplies power to the system of the motor driving board (1), the second output module supplies power to the motor driving IC (8), and the first output module comprises a first voltage stabilizer (U803), a second voltage stabilizer (U800) and a converter (U801) which are sequentially connected.
  4. 4. The device for testing a micro stepping motor according to claim 3, wherein the second output module comprises a third voltage stabilizer (U802), the third voltage stabilizer (U802) is connected with a third resistor (R800) and a fourth resistor (R806), the third voltage stabilizer (U802) is connected with a digital-to-analog converter (U804) through a fifth resistor (R810), the output voltage of the digital-to-analog converter (U804) is dac_outa, abbreviated as VSETA of dac_outa, the VSENSE pin voltage of the third voltage stabilizer (U802) is VFB, VFB is 1.221V, and the relation between the output voltage pp_drive and dac_outa is deduced according to the calculation formula of the third voltage stabilizer (U802) according to the law of KCL as follows: Where IFB is the output current of VSENSE for U800, which is negligible in the calculation because it is very small; R800 = 91kohm R810 = 10kohm R806 = 10kohm VFB = 1.221V the voltage relationship from Vout to VSETA is thus deduced to be (in V): PP_DRIVER =23.4432-9.1×VSETA。
  5. 5. The test device of a micro stepping motor according to claim 1, wherein the motor driving IC (8) comprises a low voltage stepping motor driver (U1001), the low voltage stepping motor driver (U1001) is connected with a differential operational amplifier (U1000) and a fifth resistor (R1004), the fifth resistor (R1004) is used as a sampling resistor Rs, the current Idriver is converted into a differential voltage vdiff_curr after passing through the sampling resistor Rs, and the differential operational amplifier (U1000) amplifies the differential voltage to obtain a test single-ended voltage Vcurr, and the formula is derived as follows: Vdiff_curr = Idriver×Rs Vcurr =Vdiff_curr × Gain; wherein Rs=0.1 ohm Gain =100; The drive IC current Idriver can thus be obtained as: Idriver = Vcurr/10。
  6. 6. the device for testing a micro-stepper motor according to claim 5, wherein the front end of the differential operational amplifier (U1000) is provided with an RFI filter whose cut-off frequency is calculated as follows: wherein fcm is the common mode cut-off frequency; fdiff is the differential mode cut-off frequency; R1000 = 1kohm C1001 = 10nF C1002 = 100nF from this, fcm and fdiff can be calculated as follows: fcm = 15.9kHz fdiff = 0.757kHz。
  7. 7. The device for testing the micro stepping motor according to claim 1, wherein the rotation speed acquisition circuit (9) is matched with an output shaft of the micro motor product (3) through an optical fiber amplifier, a lens and an optical fiber sensor, the rotation speed acquisition circuit (9) comprises a hysteresis comparator (U1100), the hysteresis comparator (U1100) is connected with an NMOS tube (Q1100), when an optical fiber signal is input to be at a high level, a drain electrode of the NMOS tube is pulled down and passes through the hysteresis comparator (U1100) to output a low level, when the optical fiber signal is input to be at a low level, the NMOS tube (Q1100) is not conducted, the drain electrode is at a high level and passes through the hysteresis comparator (U1100) to output to be at a high level, and the signal frequency F is acquired by the control module (6) through level conversion as above; The rotational speed V is as follows: 。

Description

Testing device of miniature stepping motor Technical Field The invention is applied to the technical field of stepper motor testing, and particularly relates to a testing device of a miniature stepper motor. Background The micro stepping motor test is mainly used for driving the micro stepping motor to rotate and testing various electrical performance parameters. In particular to a miniature stepping motor with a board-to-board connector on the product. The structure of the motor is approximately shown in fig. 12, and mainly comprises a switching soft board, a motor body, a gearbox steering shaft and an output shaft. The coil inside the motor body is connected with the connector through the switching Flex so as to switch signals out and access the control system, and the motor is convenient to connect with the control system. The main functions of the miniature motor are used for intelligent wearing, entertainment equipment such as cameras and projectors, and even for development of VR glasses, so that the miniature motor is high in precision, accurate in positioning and high in anti-interference capability. The current driving scheme for realizing the miniature motor in the market mainly uses a driver module to realize the driving of the miniature motor by directly buckling with a product B2B connector and realize the driving function of the motor by equipment. As disclosed in chinese patent publication No. CN207166317U, the connector and the integrated power driving system having the same, B2B on the driving module is directly buckled with the product connector, and under long-term use, the B2B of the micro motor driver module is easy to be damaged, and may also be damaged during the buckling process, so that the B2B of the product is damaged, resulting in the situation of rising loss cost. When testing motor power, a dynamometer is mostly adopted to test driving input current. When the device is used as a miniature motor for driving, the device is easy to cause the conditions of high cost and large occupied space. Therefore, it is necessary to provide a testing device for a micro stepping motor, which has the advantages of simple circuit, low cost, flexible operation, convenient maintenance, compatibility with various functions and capability of realizing performance test of the micro motor. Disclosure of Invention The invention aims to solve the technical problem of overcoming the defects of the prior art, and provides a testing device of a micro stepping motor, which has the advantages of simple circuit, low cost, flexible operation, convenient maintenance, compatibility with multiple functions and realization of performance test of the micro motor. The micro-motor driving device comprises a motor driving plate, wherein the motor driving plate is connected with a micro-motor product through a signal transfer module, the signal transfer module comprises a signal transfer plate and a pin point transfer plate, the motor driving plate comprises a control module, the control module is connected with a signal communication module, a motor driving IC and a rotating speed acquisition circuit, the motor driving IC is connected with a power module, the motor driving plate is used for controlling and acquiring the work, working current voltage and rotating speed of the micro-motor product, the signal transfer module is used for transferring signals of the micro-motor product to the motor driving plate, the power module is used for controlling the power voltage of the motor driving IC, the signal communication module is used for transmitting instructions of an upper computer to the control module, the control module is used for controlling the motor driving IC through a UART (universal asynchronous receiver/transmitter) to drive the micro-motor product to rotate forwards and reversely, and the rotating speed acquisition circuit is used for reading the rotating speed of the micro-motor product. The application adopts the proposal of needle point switching and driver modular design, which not only solves the problem of reducing the damage probability of the driver module, but also saves the space and cost of the module, has lower test cost, is suitable for the project with limited budget, is flexible in operation, is convenient for maintenance and test, and reduces the problem of false detection caused by misoperation in operation. The preferred scheme is that the signal communication module comprises a UART chip, the UART chip is connected with a TVS transient diode, the TVS transient diode is connected with a USBMiniB interface, the USBMiniB interface is connected with an upper computer, the UART chip is connected with a pi-type filter circuit, and the pi-type filter circuit comprises a first resistor, a second resistor, a first capacitor, a second capacitor, a third capacitor and a fourth capacitor. The power supply module comprises a first output module and a second output module, wherein the first output module