Automatic control circuit of rotary table motor

Abstract

The utility model relates to an automatic control circuit of a rotary table motor, which is used for being matched with an upper computer to realize automatic control of the rotary table motor. Comprising a power supply module which is connected with a switching power supply and is used for supplying power, a main control chip, a 232 communication module which communicates with an upper computer, and a 24V power supply enabling module and a motor driving communication module which communicate with a servo motor driver through a DB-9 interface, the main control chip is respectively connected with the 232 communication module, the 24V power supply enabling module and the motor driving communication module, and the servo motor driver is connected with the rotary table motor. Compared with the prior art, the device has the advantages of simple structure, rich functions, low cost, easiness in operation and the like.

Description

Technical Field

[0001] The utility model relates to the field of automatic control of turntable motors, and in particular to an automatic control circuit for a turntable motor. Background Art

[0002] During the production of inclination sensors, it is necessary to debug and test the inclination sensor products. The inclination sensor products to be tested are installed on a high-precision turntable through a tooling plate, and the rotation of the turntable is achieved by controlling the driving motor of the turntable. It rotates to each debugging angle position and then cooperates with the upper computer to complete the angle debugging. In order to realize the automatic control of the turntable rotation and meet the requirements of automatic debugging, an automatic control circuit for a turntable motor is needed. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the defects existing in the above-mentioned prior art and provide an automatic control circuit for a turntable motor to cooperate with the upper computer to realize the automatic control of the turntable motor, including a power supply module connected to a switching power supply for power supply, a main control chip, a 232 communication module communicating with the upper computer, and a 24V power supply enabling module and a motor drive communication module respectively communicating with a servo motor driver through a DB-9 interface. The main control chip is respectively connected to the 232 communication module, the 24V power supply enabling module, and the motor drive communication module, and the servo motor driver is connected to the turntable motor.

[0004] Preferably, the power supply module includes a 24V input circuit, a 6.8V voltage conversion circuit, a 5V voltage conversion circuit, a 3.3V voltage conversion circuit, and a fan power supply circuit. The 24V input circuit is respectively connected to the switching power supply, the 6.8V voltage conversion circuit, the fan power supply circuit, the 24V power supply enabling module, and the relay module. The 6.8V voltage conversion circuit is respectively connected to the 5V voltage conversion circuit and the 3.3V voltage conversion circuit.

[0005] Preferably, the 232 communication module includes a 232 communication chip. The signal input end of the 232 communication chip is connected to the TTL signal output end of the main control chip, and the RS232 signal output end of the 232 communication chip communicates with the upper computer through a DB-9 connector.

[0006] Preferably, the 24V power supply enabling module includes a power load switch chip. The output end of the 1st pin of the power load switch chip is grounded through a varistor and a grounding resistor. The 2nd pin is grounded through a current limiting protection resistor R22. The 3rd pin is connected to the signal output end Pout of the main control chip through a resistor, and the 4th pin is connected to the 24V input circuit.

[0007] Preferably, the motor drive communication module includes a signal amplification chip. The control signal terminal of the main control chip is connected to the corresponding node of the DB-9 interface after signal amplification processing through the signal amplification chip.

[0008] Preferably, it further includes a USB communication module respectively communicating with the main control chip and the host computer, and the relay module communicating with the main control chip. The relay module communicates with the servo motor driver through the DB-9 interface.

[0009] Preferably, the USB communication module includes a USB interface, an electrostatic surge protection tube, and a triode. The USB signal sending terminal of the main control chip is connected to the signal receiving terminal of the USB interface through a resistor. One end of the electrostatic surge protection tube is connected between the USB signal sending terminal of the main control chip and the signal receiving terminal of the USB interface, and the other end is grounded. The base of the triode is connected to the USB enable signal terminal of the main control chip, the collector is connected to the output terminal of the 3.3V voltage conversion circuit, and the emitter is connected to the USB interface through a resistor.

[0010] Preferably, the relay module includes a relay and a triode. The base of the triode is connected to the signal output terminal Pout of the main control chip, the collector is connected to one end of the relay coil, the emitter is grounded, the other end of the relay coil is connected to the output terminal of the 5V voltage conversion circuit, one end of the relay switch is connected to the DB-9 interface, and the other end is connected to the output terminal of the 24V input circuit.

[0011] Preferably, it further includes a status indication module and a signal indication module respectively connected to the main control chip.

[0012] Preferably, a test port for testing the signal functions of each signal of the main control chip is further provided on the servo control board.

[0013] The object of the present invention can be achieved by the following technical solutions:

[0014] Compared with the prior art, the present invention realizes the precise control of the Yaskawa motor of the tilt sensor test turntable through the self-designed servo control board circuit and the chassis, and also reserves redundant circuits for expansion and prevention of failures. In addition, test interfaces are designed for easy use during testing. The structure is simple, the functions are rich, the cost is low, and it is easy to operate. It can meet the requirements of automatic debugging by cooperating with the automatic debugging software of the host computer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic circuit diagram of the present invention.

[0016] Figure 2 Circuit structure diagram of the 24V input circuit.

[0017] Figure 3 Circuit structure diagram of the 6.8V voltage conversion circuit.

[0018] Figure 4 Circuit structure diagram of the 5V voltage conversion circuit and the 3.3V voltage conversion circuit.

[0019] Figure 5 Circuit structure diagram of the fan power supply circuit.

[0020] Figure 6 Circuit structure diagram of the main control chip and its peripheral circuits.

[0021] Figure 7 Circuit structure diagram of the 232 communication module.

[0022] Figure 8 Circuit structure diagram of the USB communication module.

[0023] Figure 9 Circuit structure diagram of the status indication module.

[0024] Figure 10 Circuit structure diagram of the 24V power supply enable module.

[0025] Figure 11 Circuit structure diagram of the relay module.

[0026] Figure 12 Circuit structure diagram of the signal indication module.

[0027] Figure 13 Circuit structure diagram of the motor drive communication module.

[0028] Description of the reference numerals:

[0029] 1. Turntable motor, 2. Servo motor driver, 3. Switching power supply, 4. Servo control board, 41. Power module, 42. 232 communication module, 43. USB communication module, 44. Status indication module, 45. 24V power supply enable module, 46. Relay module, 47. Signal indication module, 48. Motor drive communication module, 5. Fan, 6. Chassis, 7. Host computer, 8. Three-phase power supply. Detailed implementation manners

[0030] The present utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present utility model, and detailed implementation manners and specific operation procedures are given, but the protection scope of the present utility model is not limited to the following embodiments.

[0031] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0032] In the description of this embodiment, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0033] The terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0034] In the description of this embodiment, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0035] To make the objectives, technical solutions, and advantages of the present utility model clearer, the embodiments of the present utility model will be described in further detail below in conjunction with the drawings.

[0036] Embodiment

[0037] As Figure 1 shown, the present utility model provides an automatic control circuit for a turntable motor. This automatic control circuit is set on a servo control board 4. The servo control board 4 communicates with a host computer 7 and controls the turntable motor 1 (in this example, a Yaskawa servo motor) through a servo motor driver 2 to achieve high-precision control of the tilt sensor debugging turntable. The servo motor driver 2, a switching power supply 3, the servo control board 4, and a fan 5 are all set in a chassis 6. The switching power supply 3 is connected to an external three-phase power supply 8 for power supply.

[0038] The automatic control circuit includes a power supply module 41, a main control chip U5 and its peripheral circuit, a 232 communication module 42, a USB communication module 43, a status indication module 44, a 24V power supply enabling module 45, a relay module 46, a signal indication module 47, and a motor drive communication module 48. The power supply module 41 is connected to a 24V switching power supply 3. The main control chip U5 communicates with a host computer 7 through the 232 communication module 42 using the 232 serial communication method (when the 232 communication module 42 fails, it can communicate with the host computer 7 through the USB communication module 43 using the USB communication method). The main control chip U5 is connected to a DB-9 interface J3 through the 24V power supply enabling module 45, and the DB-9 interface J3 communicates with a servo motor driver 2 (when the 24V power supply enabling module 45 fails, it can be connected to the DB-9 interface J3 through the relay module 46 using the relay method). Moreover, the main control chip U5 is connected to a DB-9 interface through the motor drive communication module 48 to achieve communication with the servo motor driver 2; the status indication module 44 and the signal indication module 47 are respectively connected to the main control chip U5 to achieve status and signal indication.

[0039] The power supply module 41 is used to provide +24V, +6.8V, +5V, and +3.3V voltage outputs, and includes a 24V input circuit, a 6.8V voltage conversion circuit, a 5V voltage conversion circuit, a 3.3V voltage conversion circuit, and a fan power supply circuit.

[0040] As Figure 2 shown, in the 24V input circuit, the J1 port is connected to the switching power supply 3, and a 24V voltage (24V_INPUT) is input from the J1 port. M1 is a varistor, and F1 is a resettable fuse, preferably 100mA / 30V in this example, which plays a role in protecting against excessive current; D10 is an overvoltage protection device, preferably 40V overvoltage protection, D0 is a one-way conduction diode, which plays a role in preventing reverse connection, and C1 is a filter capacitor between the first output terminal Vin of the 24V input circuit and the pin 1 of the chip U1. In addition, the 24V voltage input (24V_INPUT) is used as the second output terminal Servor_24V of the 24V input circuit to connect to the pin 4 of the chip U6 after passing through the resettable fuse F2 (it is also connected to the relay switch K1 of the relay module 46).

[0041] As Figure 3 shown, the 6.8V voltage conversion circuit includes a power management chip U1 and its peripheral circuit, which is used to convert the first output terminal Vin of the 24V input circuit into a 6.8V voltage output. The model of the power management chip U1 is TD1509PR, and its voltage output Vout = 1.23*(1 + R2 / R1). D9 is an output rectifier diode, L1 is an output inductor, C3 and C4 are both output capacitors, and C2 is a feedforward capacitor.

[0042] AsFigure 4 As shown, the input terminals of the 5V voltage conversion circuit and the 3.3V voltage conversion circuit are respectively connected to the output terminal of the 6.8V voltage conversion circuit, for converting the +6.8V voltage into +5V voltage and +3.3V voltage. C13 and C15 are input terminal filter capacitors. The 6.8V voltage is converted into 3.3V output through chip U3 (model LM1117-3.3), and converted into 5V output through chip U4 (model LM1117-5.0). C25 and C27 are 5V output terminal capacitors, and C24 and C26 are 3.3V output terminal filter capacitors.

[0043] As Figure 5 shown, in the fan power supply circuit, chip U2 (model TD1509PR) and its peripheral circuit are used to convert the first output terminal Vin of the 24V input circuit into 5V voltage and output it to the fan power supply interface J8. The fan power supply interface J8 is then connected to the fan 5, and its voltage output Vout = 1.23*(1 + R42 / R41). D20 is the output terminal rectifier diode, L2 is the output terminal inductor, C43 and C44 are the output terminal capacitors, C42 is the feedforward capacitor (can be not soldered), D21 is the overvoltage protection diode, and R100 is the current limiting resistor, which is 1k ohm in this example.

[0044] As Figure 6 shown, the model of the main control chip U5 is STM32F103CB; J6 is the programming port. Its pin 1 D3.3V is connected to pin 1 of the main control chip U5, its pin 2 SWDIO is connected to pin 34 of the main control chip U5, its pin 3 SWCLK is connected to pin 37 of the main control chip U5, and pin 4 is grounded.

[0045] Pins 1, 24, 48, and 36 of the main control chip U5 are respectively connected to the 3.3V voltage output. C32, C19, C18, C17, and C16 are all filter capacitors to the ground. Pin 9 is connected to D3.3V, and C14 is the filter capacitor to the ground. Pins 8, 23, 35, and 47 are grounded.

[0046] D3.3V is connected to pin 7 of the main control chip U5 through resistor R24, and C21 is the filter capacitor to the ground for pin 7.

[0047] The crystal oscillator Y2 is connected to pins 5 and 6 of the main control chip U5 through C35 and C37 to provide the clock level signal. Pin 44 of the main control chip U5 is grounded through resistor R25, and pin 20 is connected to D3.3V through R26.

[0048] As Figure 7As shown, the 232 communication module 42 includes a 232 communication chip U7 (model SP3232E in this example) and peripheral circuits, which are used to convert the TTL signal output by the main control chip U5 into a 232 signal, and then communicate with the host computer 7 through the DB-9 interface of the J2 connector. In the 232 communication module 42, the 12th pin of the main control chip U5 is connected to the 10th pin of the chip U7 through the resistor R33, and the 13th pin of the main control chip U5 is connected to the 9th pin of the chip U7 through the resistor R34. J5 is a redundant 232 signal connection port.

[0049] As Figure 8 shown, the USB communication module 43 is a redundant design, which is used to communicate the USB interface signal converted by the main control chip U5 with the host computer 7. In actual use, the 232 communication module 42 is adopted. When expansion is needed or the 232 communication module 42 fails, the USB communication module 43 is used to replace the communication.

[0050] The USB communication module 43 includes a USB interface J4, an electrostatic surge protection tube D17 (model NUP2201MR6), and a triode Q3. The 32nd pin USB_DM of the main control chip U5 is connected to the 2nd pin DU- of the USB interface J4 through R76, and the 33rd pin USB_DP of the main control chip U5 is connected to the 3rd pin DU+ of the USB interface J4 through R75. One end of the electrostatic surge protection tube D17 is respectively connected to the 2nd pin DU- and the 3rd pin DU+ of the USB interface J4, and the other end is grounded. The base of the triode Q3 is connected to the USB enable signal terminal (25th pin USB_EN) of the main control chip U5, the collector is connected to the output terminal of the 3.3V voltage conversion circuit, and the emitter is connected to the USB interface J4 through a resistor.

[0051] When a high level is input to the USB enable signal terminal (25th pin USB_EN) of the main control chip U5, the triode Q3 conducts. At this time, a voltage of about 2.5V is added to DU+. Thus, the communication between the main control chip U5 and the host computer 7 is realized.

[0052] As Figure 9 shown, in the status indication module 44, the 2nd and 3rd pins of the main control chip U5 respectively control the lighting and extinguishing of the light-emitting diodes D15 and D16. When LED1 outputs a high level, D15 lights up; when LED2 outputs a high level, D16 lights up.

[0053] As Figure 10As shown, in the 24V power supply enabling module 45, the 14th pin Pout of the main control chip U5 is connected to the 3rd pin of the power load switch chip U6 (model ISP452 in this example) via the resistor R20. The 4th pin of the chip U6 is connected to Servor_24V. C10 is a filter capacitor, D12 is an overvoltage protection diode. The 2nd pin of the chip U6 is grounded after passing through the current limiting protection resistor R22 (preferably 150 ohms). The output end of the 1st pin of the chip U6 is grounded through the varistor R23 and the ground resistor R80.

[0054] When the 14th pin Pout of the main control chip U5 outputs a high level, the output voltage of the 1st pin of the chip U6 (motor power supply signal MOS_24V_SW) is approximately equal to Servor_24V. The motor power supply signal MOS_24V_SW is connected to the 4th pin of the J3 interface and connected to the servo motor driver 2.

[0055] As Figure 11 As shown, the relay module 46 is a redundant design of the 24V power supply enabling module 45. When the 24V power supply enabling module 45 fails, it switches to the relay module 46. The relay module 46 includes the relay K1 and the triode Q8. The base of the triode Q8 is connected to the 14th pin Pout of the main control chip U5, the collector is connected to one end of the coil of the relay K1, the emitter is grounded. The other end of the coil of the relay K1 is connected to the output end of the 5V voltage conversion circuit. One end of the switch of the relay K1 is connected to the DB-9 interface J3, and the other end is connected to the output end of the 24V input circuit.

[0056] The signal of the 14th pin Pout of the main control chip U5 realizes the conduction and disconnection between the second output end Servor_24V of the 24V input circuit and RLY_24V_SW by controlling the relay K1. When the 14th pin pout of the main control chip U5 outputs a high level, the triode Q3 conducts, the coil of the relay K1 is energized, and the switch of the relay K1 acts, so that RLY_24V_SW is connected to the second output end Servor_24V of the 24V input circuit. And RLY_24V_SW is connected to the 9th pin of J3, and 24V voltage is output.

[0057] As Figure 12As shown in the figure, there are 8 indicator lamp circuits in the signal indication module 47. Among them, R51 and the light-emitting diode D1 are connected in series to indicate the Motor_CW signal (pin 10 of the main control chip U5), R52 and the light-emitting diode D2 are connected in series to indicate the Motor_PWM signal (pin 11 of the main control chip U5), R53 and the light-emitting diode D3 are connected in series to indicate the Motor_CLR signal (pin 38 of the main control chip U5), R54 and the light-emitting diode D4 are connected in series to indicate the TIM1_CH1 signal (pin 29 of the main control chip U5), R55 and the light-emitting diode D5 are connected in series to indicate the TIM1_CH1N signal (pin 26 of the main control chip U5), R56 and the light-emitting diode D6 are connected in series to indicate the TIM4_CH1 signal (pin 42 of the main control chip U5), R57 and the light-emitting diode D7 are connected in series to indicate the TIM4_CH2 signal (pin 43 of the main control chip U5), and R58 and the light-emitting diode D8 are connected in series to indicate the TIM3_CH1 signal (pin 16 of the main control chip U5).

[0058] In addition, in cooperation with the 8 indicator lamp circuits in the signal indicator lamp module 47, a test port P1 for facilitating wiring to test the functions of each signal during the R & D stage is also provided on the servo control board 4. The test port P1 is respectively connected to the 10th pin Motor_CW, 11th pin Motor_PWM, 38th pin Motor_CLR, 29th pin TIM1_CH1, 26th pin TIM1_CH1N, 42nd pin TIM4_CH1, 43rd pin TIM4_CH2, and 16th pin TIM3_CH1 of the main control chip U5.

[0059] Such as Figure 13As shown in the figure, in the motor drive communication module 48, the 10th pin Motor_CW, the 11th pin Motor_PWM, the 38th pin Motor_CLR, the 29th pin TIM1_CH1, the 26th pin TIM1_CH1N, the 42nd pin TIM4_CH1, the 43rd pin TIM4_CH2, and the 16th pin TIM3_CH1 of the main control chip U5 are respectively connected to the signal amplification chip U10 (ULN2803ADW is used in this example) for signal amplification processing. The signal PULS+ after passing through R61, the signal SIGN+ after passing through R62, and the signal CLR+ after passing through R63 of the 5V voltage output of the 5V voltage conversion circuit are respectively connected to the 1st, 2nd, and 3rd pins of J3. The 18th pin Motor_CW_OUT and the 15th pin TIM1_CH1_OUT of the chip U10 are respectively connected to the 6th pin of J3. The 17th pin Motor_PWM_OUT and the 14th pin TIM1_CH1N_OUT of the chip U10 are respectively connected to the 7th pin of J3. The 16th pin Motor_CLR_OUT of the chip U10 is connected to the 8th pin of J3. RLY_24V_SW is connected to the 9th pin of J3, and the motor power supply signal MOS_24V_SW is connected to the 4th pin of J3.

[0060] The servo control board 4 communicates with the servo motor driver 2 through the DB-9 interface J3. The 1st, 6th, 2nd, 7th, 4th, and 5th pins of the DB-9 interface J3 are respectively connected to the 7th, 8th, 11th, 12th, 47th, and 40th pins of the servo motor driver 2 CN1, so as to realize the motion control of the Yaskawa servo motor 1 through the servo motor driver 2, and further realize the precise control of the tilt sensor turntable.

[0061] The signal definitions of each pin in the DB-9 interface J3 are as follows:

[0062] PULS+ is connected to the output terminal of the 5V voltage conversion circuit as the +5V pull-up power supply;

[0063] PULS- is a PWM signal used to control the rotation speed of the turntable motor;

[0064] SIGN+ is connected to the output terminal of the 5V voltage conversion circuit as the +5V pull-up power supply;

[0065] SIGN- is a high and low level signal used to control the forward and reverse rotation of the turntable motor. It rotates forward at a high level and reverses at a low level;

[0066] CLR+ is connected to the output terminal of the 5V voltage conversion circuit as the +5V pull-up power supply;

[0067] MOS24V SW is a 24V voltage switch used to control the start and stop of the turntable motor;

[0068] The RLY24V SW is a spare 24V voltage switch.

[0069] The utility model realizes the precise control of the Yaskawa motor of the tilt sensor test turntable through the self-designed servo control board circuit and the chassis, and also reserves redundant circuits for expansion and fault prevention. In addition, a test interface is designed for easy use during testing. It has a simple structure, rich functions, low cost, and is easy to operate. It can meet the requirements of automatic debugging by cooperating with the automatic debugging software of the upper computer.

[0070] The preferred specific embodiments of the utility model have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field based on the concept of the utility model through logical analysis, reasoning, or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. An automatic control circuit for a turntable motor, used to cooperate with a host computer (7) to realize automatic control of a turntable motor (1), characterized in that: The invention comprises a power supply module (41) connected to a switching power supply (3) for supplying power, a main control chip (U5), a 232 communication module (42) communicating with the host computer (7), and a 24V power supply enabling module (45) and a motor drive communication module (48) respectively communicating with a servo motor driver (2) via a DB-9 interface (J3); the main control chip (U5) is respectively connected to the 232 communication module (42), the 24V power supply enabling module (45) and the motor drive communication module (48); and the servo motor driver (2) is connected to the turntable motor (1).

2. The automatic control circuit of a turntable motor according to claim 1, characterized in that: The power supply module (41) comprises a 24V input circuit, a 6.8V voltage conversion circuit, a 5V voltage conversion circuit, a 3.3V voltage conversion circuit and a fan power supply circuit; the 24V input circuit is respectively connected to the switching power supply (3), the 6.8V voltage conversion circuit, the fan power supply circuit, the 24V power supply enabling module (45) and the relay module (46); the 6.8V voltage conversion circuit is respectively connected to the 5V voltage conversion circuit and the 3.3V voltage conversion circuit.

3. The automatic control circuit of a turntable motor according to claim 1, characterized in that: The 232 communication module (42) comprises a 232 communication chip (U7), a signal input end of the 232 communication chip (U7) is connected to a TTL signal output end of the main control chip (U5), and an RS232 signal output end of the 232 communication chip (U7) communicates with the host computer (7) via a DB-9 connector (J2).

4. The automatic control circuit of a turntable motor according to claim 2, characterized in that: The 24V power supply enabling module (45) comprises a power load switch chip (U6), wherein the output end of pin 1 of the power load switch chip (U6) is grounded via a varistor and a ground resistor, pin 2 is grounded after passing through a current limiting protection resistor R22, pin 3 is connected to the signal output end Pout of the main control chip (U5) via a resistor, and pin 4 is connected to the 24V input circuit.

5. The automatic control circuit of a turntable motor according to claim 1, characterized in that: The motor drive communication module (48) comprises a signal amplifying chip (U10), and the control signal end of the main control chip (U5) is connected to the corresponding node of the DB-9 interface (J3) after signal amplification processing is performed by the signal amplifying chip (U10).

6. The automatic control circuit of a turntable motor according to claim 2, characterized in that: It also includes a USB communication module (43) that communicates with the main control chip (U5) and the host computer (7) respectively, and a relay module (46) that communicates with the main control chip (U5), and the relay module (46) communicates with the servo motor driver (2) through the DB-9 interface (J3).

7. The automatic control circuit of a turntable motor according to claim 6, characterized in that: The USB communication module (43) comprises a USB interface (J4), an electrostatic surge protection tube and a triode (Q3); the USB signal sending end of the main control chip (U5) is connected to the signal receiving end of the USB interface (J4) via a resistor; one end of the electrostatic surge protection tube is connected between the USB signal sending end of the main control chip (U5) and the signal receiving end of the USB interface (J4), and the other end is grounded; the base of the triode (Q3) is connected to the USB enable signal end of the main control chip (U5), the collector is connected to the output end of the 3.3V voltage conversion circuit, and the emitter is connected to the USB interface (J4) via a resistor.

8. The automatic control circuit of a turntable motor according to claim 6, characterized in that: The relay module (46) comprises a relay (K1) and a transistor (Q8), wherein the base of the transistor (Q8) is connected to the signal output terminal Pout of the main control chip (U5), the collector is connected to one end of the coil of the relay (K1), the emitter is grounded, the other end of the coil of the relay (K1) is connected to the output end of the 5V voltage conversion circuit, one end of the switch of the relay (K1) is connected to the DB-9 interface (J3), and the other end is connected to the output end of the 24V input circuit.

9. The automatic control circuit of a turntable motor according to claim 1, characterized in that: It also includes a status indication module (44) and a signal indication module (47) respectively connected to the main control chip (U5).

10. The automatic control circuit of a turntable motor according to claim 1, characterized in that: The servo control board (4) is also provided with a test port (P1) for testing various signal functions of the main control chip (U5).

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