A turntable motor protection circuit based on hall elements

Abstract

A turntable motor protection circuit based on Hall element relates to the technical field of turntable, when the marching lock is locked, the Hall detection chip senses the magnet installed at the lock core position of the marching lock in real time, the Hall detection chip outputs a low level signal, the U phase, V phase and W phase of the motor controller and the motor are cut off through the control circuit I, the control circuit II and the control circuit III, and the motor stops working. When the marching lock is unlocked, the Hall detection chip cannot sense the magnet at the lock core position, and the Hall detection chip outputs a high level. The U phase, V phase and W phase of the motor controller and the motor are closed through the control circuit I, the control circuit II and the control circuit III, and the motor works normally. The purpose of effectively preventing the motor of the turntable from being blocked after the turntable is locked by the marching lock, prolonging the service life of the motor and saving energy is achieved.

Description

Technical Field

[0001] This utility model relates to the field of turntable technology, specifically to a turntable motor protection circuit based on Hall elements. Background Technology

[0002] With the continuous maturation of technology, the application fields of photoelectric turntables are becoming increasingly widespread. In existing application scenarios such as coastal defense monitoring, forest fire prevention, and airport protection, functions with a large operating range and high flexibility, such as bird deterrence, radar, and anti-drone functions, are increasingly being used in conjunction with vehicle-mounted turntables. The turntable motor is crucial for vehicle-mounted turntables and applications requiring fixed-point monitoring. This is because vehicle-mounted turntables and fixed-point monitoring are generally used with military locks. However, even after the military lock is engaged, the turntable motor continues to operate, significantly reducing its lifespan. Furthermore, the need to remain in a fixed position for extended periods while locked can cause the turntable to stall, and in more serious cases, even lead to safety accidents and equipment damage. Summary of the Invention

[0003] In order to overcome the shortcomings of the above technologies, this utility model provides a turntable motor protection circuit to avoid reducing the lifespan of the turntable motor and causing it to stall and damage the equipment due to prolonged operation.

[0004] The technical solution adopted by this utility model to overcome its technical problem is:

[0005] A turntable motor protection circuit based on Hall effect elements includes:

[0006] The Hall effect sensor chip is installed in the keyhole of the trolley lock. A magnet is installed at the head end of the trolley lock cylinder. When the trolley lock is in the locked state, the magnet triggers the Hall effect sensor chip. The GND pin of the Hall effect sensor chip is grounded, and its VCC pin is connected to a 5V power supply.

[0007] The operational amplifier has its positive input terminal connected to the negative terminal of a Zener diode, the positive terminal of which is connected to the VOUT pin of a Hall effect sensor chip. The negative input terminal of the operational amplifier is grounded, its power supply terminal is connected to a 5V power supply, and its ground terminal is grounded.

[0008] The motor controller and the U-phase of the motor are connected to the output of the operational amplifier through control circuit I;

[0009] The motor controller and the V phase of the motor are connected to the output of the operational amplifier through control circuit II;

[0010] The motor controller and the motor's W phase are connected to the output of the operational amplifier via control circuit III;

[0011] When the operational amplifier outputs a low-level signal, control circuit I disconnects the motor controller from the motor's U phase, control circuit II disconnects the motor controller from the motor's V phase, and control circuit III disconnects the motor controller from the motor's W phase.

[0012] Preferably, the Hall effect detection chip is the MLX90248ESE type Hall effect detection chip.

[0013] Furthermore, it also includes capacitor I, resistor I, capacitor II, and capacitor III. One end of capacitor I is connected to the VCC pin of the Hall effect sensor chip, and the other end is connected to the GND pin of the Hall effect sensor chip. The VOUT pin of the Hall effect sensor chip is connected to one end of capacitor II, one end of resistor I, and one end of capacitor III, respectively. The other ends of capacitors II and III are grounded, and the other end of resistor I is connected to a 5V power supply.

[0014] Furthermore, the aforementioned control circuit I includes an optocoupler I, a transistor I, and a relay I. The anode of the input terminal of the optocoupler I is grounded, its cathode is connected to the output terminal of the operational amplifier, its collector is connected to a 12V power supply, its emitter is connected to the base of the transistor I, the collector of the transistor I is connected to the anode of the diode I, the cathode of the diode I is connected to a 12V power supply, and the emitter of the transistor I is grounded. One end of the coil of the relay I is connected to a 12V power supply, and the other end of the coil is connected to the collector of the transistor I. The normally closed terminal of the relay I is connected to the U-phase input terminal of the motor controller, and the common terminal of the relay I is connected to the U-phase input terminal of the motor.

[0015] Furthermore, the aforementioned control circuit II includes an optocoupler II, a transistor II, and a relay II. The anode of the input terminal of the optocoupler II is grounded, its cathode is connected to the output terminal of the operational amplifier, its collector is connected to a 12V power supply, its emitter is connected to the base of the transistor II, the collector of the transistor II is connected to the anode of the diode II, the cathode of the diode II is connected to the 12V power supply, and the emitter of the transistor II is grounded. One end of the coil of the relay II is connected to the 12V power supply, and the other end of the coil is connected to the collector of the transistor II. The normally closed terminal of the relay II is connected to the V-phase input terminal of the motor controller, and the common terminal of the relay II is connected to the V-phase input terminal of the motor.

[0016] Furthermore, the aforementioned control circuit Ⅲ includes an optocoupler Ⅲ, a transistor Ⅲ, and a relay Ⅲ. The anode of the input terminal of the optocoupler Ⅲ is grounded, its cathode is connected to the output terminal of the operational amplifier, its collector is connected to a 12V power supply, its emitter is connected to the base of the transistor Ⅲ, the collector of the transistor Ⅲ is connected to the anode of the diode Ⅲ, the cathode of the diode Ⅲ is connected to a 12V power supply, and the emitter of the transistor Ⅲ is grounded. One end of the coil of the relay Ⅲ is connected to a 12V power supply, and the other end of the coil is connected to the collector of the transistor Ⅲ. The normally closed terminal of the relay Ⅲ is connected to the W-phase input terminal of the motor controller, and the common terminal of the relay Ⅲ is connected to the W-phase input terminal of the motor.

[0017] Furthermore, it also includes resistors II, III, and IV, and capacitor IV. The negative input terminal of the operational amplifier is connected to one end of resistors III and IV, respectively. The other end of resistor III is connected to one end of capacitor IV and ground, respectively. The other end of resistor IV is connected to the cathode of the input terminals of optocouplers I, II, and III, respectively. The positive input terminal of the operational amplifier is connected to one end of resistor II, and the other end of resistor II is connected to the negative terminal of the Zener diode and the other end of capacitor IV, respectively.

[0018] Furthermore, it also includes capacitors V, VI, and VII. One end of capacitor V is connected to the anode of the input terminal of optocoupler I and the 3.3V power supply, and the other end is grounded. One end of capacitor VI is connected to the anode of the input terminal of optocoupler II and the 3.3V power supply, and the other end is grounded. One end of capacitor VII is connected to the anode of the input terminal of optocoupler III and the 3.3V power supply, and the other end is grounded.

[0019] Furthermore, it also includes resistors V, VIII, and XI. One end of resistor V is connected to the output of the operational amplifier, and the other end is connected to the input cathode of optocoupler I. One end of resistor VIII is connected to the output of the operational amplifier, and the other end is connected to the input cathode of optocoupler II. One end of resistor XI is connected to the output of the operational amplifier, and the other end is connected to the input cathode of optocoupler III.

[0020] Furthermore, it also includes resistors VI, VII, IX, X, XII, and XIII. The base of transistor I is connected to one end of resistor VI and one end of resistor VII, respectively. The other end of resistor VI is connected to the emitter of the output terminal of optocoupler I, and the other end of resistor VII is grounded. The base of transistor II is connected to one end of resistor IX and one end of resistor X, respectively. The other end of resistor IX is connected to the emitter of the output terminal of optocoupler II, and the other end of resistor XIII is grounded. The base of transistor III is connected to one end of resistor XII and one end of resistor XIII, respectively. The other end of resistor XII is connected to the emitter of the output terminal of optocoupler III, and the other end of resistor XIII is grounded.

[0021] The beneficial effects of this invention are as follows: When the lock is engaged, the Hall effect sensor chip detects the magnet installed at the lock cylinder position in real time, outputting a low-level signal. This signal, transmitted through control circuits I, II, and III, disconnects the motor controller from the motor's U, V, and W phases, causing the motor to stop working. When the lock is unlocked, the Hall effect sensor chip no longer detects the magnet at the lock cylinder position, outputting a high-level signal. This signal, transmitted through control circuits I, II, and III, closes the connection between the motor controller and the motor's U, V, and W phases, allowing the motor to operate normally. This effectively prevents the turntable motor from stalling after the lock is engaged, extends motor life, and saves energy. Attached Figure Description

[0022] Figure 1 This is a diagram showing the state of the military lock of this utility model when it is locked.

[0023] Figure 2 This is a diagram showing the state of the field lock of this utility model when it is unlocked;

[0024] Figure 3 This is a circuit structure diagram of the present invention;

[0025] In the diagram: 1. Hall effect sensor chip; 2. Capacitor I; 3. Resistor I; 4. Capacitor II; 5. Zener diode; 6. Capacitor III; 7. Capacitor IV; 8. Operational amplifier; 9. Resistor II; 10. Resistor III; 11. Resistor IV; 12. Optocoupler I; 13. Capacitor V; 14. Resistor V; 15. Transistor I; 16. Diode I; 17. Resistor VI; 18. Resistor VII; 19. Relay I; 20. Optocoupler II; 21. Capacitor VI; 22. Resistor VIII; 23. Transistor II; 24. Diode II; 25. Resistor IX; 26. Resistor X; 27. Relay II; 28. Optocoupler III; 29. ​​Capacitor VII; 30. Resistor XI; 31. Transistor III; 32. Diode III; 33. Resistor XII; 34. Resistor XIII; 35. Relay III. 36. Motor controller 37. Motor 38. Military lock 39. Magnet. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1 Appendix Figure 2 Appendix Figure 3 The present invention will be further described below.

[0027] As attached Figure 3As shown, a turntable motor protection circuit based on Hall effect elements includes: a Hall effect detection chip 1, installed in the lock hole of a trolley lock 38; a magnet 39 is installed at the head end of the lock cylinder of the trolley lock 38; when the trolley lock 38 is in the locked state, the magnet 39 triggers the Hall effect detection chip 1; the GND pin of the Hall effect detection chip 1 is grounded, and its VCC pin is connected to a 5V power supply; an operational amplifier 8, whose positive input terminal is connected to the negative terminal of a Zener diode 5; the positive terminal of the Zener diode 5 is connected to the VOUT pin of the Hall effect detection chip 1; the negative input terminal of the operational amplifier 8 is grounded, and its power supply terminal is connected to a 5V power supply. Its grounding terminal is grounded; the U phase of motor controller 36 and motor 37 is connected to the output terminal of operational amplifier 8 through control circuit I; the V phase of motor controller 36 and motor 37 is connected to the output terminal of operational amplifier 8 through control circuit II; the W phase of motor controller 36 and motor 37 is connected to the output terminal of operational amplifier 8 through control circuit III; when operational amplifier 8 outputs a low-level signal, control circuit I disconnects the U phase of motor controller 36 and motor 37, control circuit II disconnects the V phase of motor controller 36 and motor 37, and control circuit III disconnects the W phase of motor controller 36 and motor 37. (See attached diagram) Figure 1 As shown, when the lock is locked, the Hall effect sensor chip 1 senses the magnet 39 installed in the lock cylinder position in real time, and outputs a low-level signal. This output signal is regulated by the Zener diode 5 and amplified by the operational amplifier 8, then disconnects the U-phase, V-phase, and W-phase of the motor controller 36 from the motor 37 via control circuits I, II, and III respectively, stopping the motor 37 from operating and protecting it. (See attached diagram) Figure 2 As shown, when the trolley lock 38 is unlocked, the Hall effect sensor chip 1 cannot sense the magnet 39 at the lock cylinder position, and the Hall effect sensor chip 1 outputs a high level. After being regulated and amplified, the high level simultaneously closes the U, V, and W phases of the motor controller 36 and the motor 37 through control circuits I, II, and III, allowing the motor 37 to operate normally. This effectively prevents the turntable motor 37 from stalling after the turntable is locked by the trolley lock 38, extends the life of the motor 37, and saves energy.

[0028] In one embodiment of this utility model, the Hall detection chip 1 is selected as the MLX90248ESE type Hall detection chip.

[0029] In one embodiment of this utility model, it further includes capacitor I2, resistor I3, capacitor II4, and capacitor III6. One end of capacitor I2 is connected to the VCC pin of Hall effect sensor chip 1, and the other end is connected to the GND pin of Hall effect sensor chip 1. The VOUT pin of Hall effect sensor chip 1 is connected to one end of capacitor II4, one end of resistor I3, and one end of capacitor III6, respectively. The other ends of capacitors II4 and III6 are grounded, and the other end of resistor I3 is connected to a 5V power supply. Capacitors I2, II4, and III6 are all filter capacitors, and resistor I3 is a pull-up resistor.

[0030] In one embodiment of this utility model, the control circuit I includes an optocoupler I 12, a transistor I 15, and a relay I 19. The anode of the input terminal of the optocoupler I 12 is grounded, the cathode of its input terminal is connected to the output terminal of the operational amplifier 8, the collector of its output terminal is connected to a 12V power supply, the emitter of its output terminal is connected to the base of the transistor I 15, the collector of the transistor I 15 is connected to the anode of the diode I 16, the cathode of the diode I 16 is connected to the 12V power supply, the emitter of the transistor I 15 is grounded, one end of the coil of the relay I 19 is connected to the 12V power supply, the other end of its coil is connected to the collector of the transistor I 15, the normally closed terminal of the relay I 19 is connected to the U-phase input terminal of the motor controller 36, and the common terminal of the relay I 19 is connected to the U-phase input terminal of the motor 37.

[0031] In one embodiment of this utility model, the control circuit II includes an optocoupler II 20, a transistor II 23, and a relay II 27. The anode of the input terminal of the optocoupler II 20 is grounded, the cathode of its input terminal is connected to the output terminal of the operational amplifier 8, the collector of its output terminal is connected to a 12V power supply, the emitter of its output terminal is connected to the base of the transistor II 23, the collector of the transistor II 23 is connected to the anode of the diode II 24, the cathode of the diode II 24 is connected to the 12V power supply, the emitter of the transistor II 23 is grounded, one end of the coil of the relay II 27 is connected to the 12V power supply, the other end of its coil is connected to the collector of the transistor II 23, the normally closed terminal of the relay II 27 is connected to the V-phase input terminal of the motor controller 36, and the common terminal of the relay II 27 is connected to the V-phase input terminal of the motor 37.

[0032] In one embodiment of this utility model, the control circuit III includes an optocoupler III 28, a transistor III 31, and a relay III 35. The anode of the input terminal of the optocoupler III 28 is grounded, the cathode of its input terminal is connected to the output terminal of the operational amplifier 8, the collector of its output terminal is connected to a 12V power supply, the emitter of its output terminal is connected to the base of the transistor III 31, the collector of the transistor III 31 is connected to the anode of the diode III 32, the cathode of the diode III 32 is connected to a 12V power supply, the emitter of the transistor III 32 is grounded, one end of the coil of the relay III 35 is connected to a 12V power supply, the other end of its coil is connected to the collector of the transistor III 32, the normally closed terminal of the relay III 35 is connected to the W-phase input terminal of the motor controller 36, and the common terminal of the relay III 35 is connected to the W-phase input terminal of the motor 37.

[0033] When the turntable locking lock is engaged, Hall effect chip 1 detects magnet 39 at the lock head position and outputs a low-level signal. The output voltage level signal, after being regulated and amplified by Zener diode 5 and operational amplifier 8, simultaneously reaches the input terminals of optocoupler I 12, optocoupler II 20, and optocoupler III 28. The photodiodes at the input terminals of optocouplers I 12, II 20, and III 28 conduct, and the transistors at their output terminals conduct, thereby turning on transistors I 15, II 23, and III 31 respectively. This, in turn, causes current to flow through the coils of relays I 19, II 27, and III 35, energizing them. The U, V, and W phases of motor 37, located at the common terminal, switch from normally closed to normally open. Motor controller 36 can no longer detect the phase of motor 37, and motor 37 stops working, thus protecting motor 37. When the lock is unlocked, Hall effect sensor 1 cannot sense magnet 39 at the lock cylinder position, and outputs a high level. The output level signal, after being regulated and amplified by Zener diode 5 and operational amplifier 8, simultaneously reaches the input terminals of optocoupler I 12, optocoupler II 20, and optocoupler III 28. The photodiodes at the input terminals of optocoupler I 12, optocoupler II 20, and optocoupler III 28 are cut off, thereby cutting off transistors I 15, II 23, and III 31 respectively. Consequently, no current flows through the coils of relays I 19, II 27, and III 35 respectively. The U-phase, V-phase, and W-phase of motor 37 at the common terminal of the coils of relays I 19, II 27, and III 35 are normally closed, and motor 37 operates normally.

[0034] Preferably, diodes I 16, II 24, and III 32 are 1N4148W type diodes. Optocouplers I 12, II 20, and III 28 are TLP292 type optocouplers. Relays I 19, II 27, and III 35 are HHC67E-1Z type relays.

[0035] In one embodiment of this utility model, it further includes resistors II 9, III 10, IV 11, and capacitor IV 7. The negative input terminal of operational amplifier 8 is connected to one end of resistors III 10 and IV 11, respectively. The other end of resistor III 10 is connected to one end of capacitor IV 7 and ground, respectively. The other end of resistor IV 11 is connected to the cathode of the input terminals of optocouplers I 12, II 20, and III 28, respectively. The positive input terminal of operational amplifier 8 is connected to one end of resistor II 9, and the other end of resistor II 9 is connected to the negative terminal of Zener diode 5 and the other end of capacitor IV 7, respectively. Resistor II 9 is a voltage divider resistor, resistor III 10 is a current limiting resistor, resistor IV 11 is a feedback resistor, and capacitor IV 7 is a filter capacitor.

[0036] In one embodiment of this utility model, capacitors V13, VI21, and VII29 are also included. One end of capacitor V13 is connected to the anode of the input terminal of optocoupler I 12 and the 3.3V power supply, and the other end is grounded. One end of capacitor VI21 ​​is connected to the anode of the input terminal of optocoupler II 20 and the 3.3V power supply, and the other end is grounded. One end of capacitor VII29 is connected to the anode of the input terminal of optocoupler III 28 and the 3.3V power supply, and the other end is grounded. Capacitors V13, VI21, and VII29 are all filter capacitors.

[0037] In one embodiment of this utility model, resistors V14, VIII 22, and XI 30 are further included. One end of resistor V14 is connected to the output terminal of operational amplifier 8, and the other end is connected to the input cathode of optocoupler I 12. One end of resistor VIII 22 is connected to the output terminal of operational amplifier 8, and the other end is connected to the input cathode of optocoupler II 20. One end of resistor XI 30 is connected to the output terminal of operational amplifier 8, and the other end is connected to the input cathode of optocoupler III 28. Resistors V14, VIII 22, and XI 30 are all bias resistors.

[0038] In one embodiment of this utility model, resistors VI 17, VII 18, IX 25, X 26, XII 33, and X 34 are further included. The base of transistor I 15 is connected to one end of resistor VI 17 and one end of resistor VII 18, respectively. The other end of resistor VI 17 is connected to the emitter of the output terminal of optocoupler I 12, and the other end of resistor VII 18 is grounded. The base of transistor II 23 is connected to one end of resistor IX 25 and one end of resistor X II 26, respectively. The other end of resistor IX 25 is connected to the emitter of the output terminal of optocoupler II 20, and the other end of resistor X II 26 is grounded. The base of transistor III 31 is connected to one end of resistor XII 33 and one end of resistor XIII 34, respectively. The other end of resistor XII 33 is connected to optocoupler III. The emitter of the output terminal of 28 is connected to ground at the other end of resistor XIII 34. Resistors VI 17, IX 25, and XII 33 are all bias resistors, while resistors VII 18, X 26, and X 34 are all current-limiting resistors.

[0039] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A turntable motor protection circuit based on Hall effect elements, characterized in that, include: Hall detection chip (1) is installed in the lock hole of the military lock (38). A magnet (39) is installed at the head end of the lock cylinder of the military lock (38). When the military lock (38) is in the locked state, the magnet (39) triggers the Hall detection chip (1). The GND pin of the Hall detection chip (1) is grounded, and its VCC pin is connected to a 5V power supply. The positive input terminal of the operational amplifier (8) is connected to the negative terminal of the Zener diode (5), the positive terminal of the Zener diode (5) is connected to the VOUT pin of the Hall detection chip (1), the negative input terminal of the operational amplifier (8) is grounded, its power supply terminal is connected to a 5V power supply, and its ground terminal is grounded. The U phase of the motor controller (36) and the motor (37) are connected to the output of the operational amplifier (8) through the control circuit I; The V phase of the motor controller (36) and the motor (37) are connected to the output of the operational amplifier (8) through the control circuit II; The motor controller (36) and the W phase of the motor (37) are connected to the output of the operational amplifier (8) through the control circuit III; When the operational amplifier (8) outputs a low-level signal, control circuit I disconnects the U phase between the motor controller (36) and the motor (37), control circuit II disconnects the V phase between the motor controller (36) and the motor (37), and control circuit III disconnects the W phase between the motor controller (36) and the motor (37).

2. The turntable motor protection circuit based on Hall element according to claim 1, characterized in that: The Hall detection chip (1) is the MLX90248ESE type Hall detection chip.

3. The turntable motor protection circuit based on Hall elements according to claim 1, characterized in that: It also includes capacitor I (2), resistor I (3), capacitor II (4) and capacitor III (6). One end of capacitor I (2) is connected to the VCC pin of Hall detection chip (1), and the other end is connected to the GND pin of Hall detection chip (1). The VOUT pin of Hall detection chip (1) is connected to one end of capacitor II (4), one end of resistor I (3) and one end of capacitor III (6). The other ends of capacitor II (4) and capacitor III (6) are grounded, and the other end of resistor I (3) is connected to a 5V power supply.

4. The turntable motor protection circuit based on Hall element according to claim 1, characterized in that: The control circuit I includes an optocoupler I (12), a transistor I (15), and a relay I (19). The anode of the input terminal of the optocoupler I (12) is grounded, the cathode of its input terminal is connected to the output terminal of the operational amplifier (8), the collector of its output terminal is connected to a 12V power supply, the emitter of its output terminal is connected to the base of the transistor I (15), the collector of the transistor I (15) is connected to the positive terminal of the diode I (16), the negative terminal of the diode I (16) is connected to a 12V power supply, the emitter of the transistor I (15) is grounded, one end of the coil of the relay I (19) is connected to a 12V power supply, the other end of its coil is connected to the collector of the transistor I (15), the normally closed terminal of the relay I (19) is connected to the U-phase input terminal of the motor controller (36), and the common terminal of the relay I (19) is connected to the U-phase input terminal of the motor (37).

5. The turntable motor protection circuit based on Hall elements according to claim 4, characterized in that: The control circuit II includes an optocoupler II (20), a transistor II (23), and a relay II (27). The anode of the input terminal of the optocoupler II (20) is grounded, the cathode of its input terminal is connected to the output terminal of the operational amplifier (8), the collector of its output terminal is connected to a 12V power supply, the emitter of its output terminal is connected to the base of the transistor II (23), the collector of the transistor II (23) is connected to the positive terminal of the diode II (24), the negative terminal of the diode II (24) is connected to a 12V power supply, the emitter of the transistor II (23) is grounded, one end of the coil of the relay II (27) is connected to a 12V power supply, the other end of its coil is connected to the collector of the transistor II (23), the normally closed terminal of the relay II (27) is connected to the V-phase input terminal of the motor controller (36), and the common terminal of the relay II (27) is connected to the V-phase input terminal of the motor (37).

6. The turntable motor protection circuit based on Hall elements according to claim 5, characterized in that: The control circuit Ⅲ includes an optocoupler Ⅲ (28), a transistor Ⅲ (31), and a relay Ⅲ (35). The anode of the input terminal of the optocoupler Ⅲ (28) is grounded, the cathode of its input terminal is connected to the output terminal of the operational amplifier (8), the collector of its output terminal is connected to a 12V power supply, the emitter of its output terminal is connected to the base of the transistor Ⅲ (31), the collector of the transistor Ⅲ (31) is connected to the positive terminal of the diode Ⅲ (32), the negative terminal of the diode Ⅲ (32) is connected to a 12V power supply, the emitter of the transistor Ⅲ (32) is grounded, one end of the coil of the relay Ⅲ (35) is connected to a 12V power supply, the other end of its coil is connected to the collector of the transistor Ⅲ (32), the normally closed terminal of the relay Ⅲ (35) is connected to the W-phase input terminal of the motor controller (36), and the common terminal of the relay Ⅲ (35) is connected to the W-phase input terminal of the motor (37).

7. The turntable motor protection circuit based on Hall element according to claim 6, characterized in that: It also includes resistors II (9), III (10), IV (11), and capacitor IV (7). The negative input terminal of the operational amplifier (8) is connected to one end of resistors III (10) and IV (11), respectively. The other end of resistor III (10) is connected to one end of capacitor IV (7) and ground, respectively. The other end of resistor IV (11) is connected to the cathode of the input terminal of optocoupler I (12), optocoupler II (20), and optocoupler III (28), respectively. The positive input terminal of the operational amplifier (8) is connected to one end of resistor II (9), and the other end of resistor II (9) is connected to the negative terminal of Zener diode (5) and the other end of capacitor IV (7), respectively.

8. The turntable motor protection circuit based on Hall elements according to claim 6, characterized in that: It also includes capacitor V (13), capacitor VI (21) and capacitor VII (29). One end of capacitor V (13) is connected to the anode of the input terminal of optocoupler I (12) and the 3.3V power supply, and the other end is grounded. One end of capacitor VI (21) is connected to the anode of the input terminal of optocoupler II (20) and the 3.3V power supply, and the other end is grounded. One end of capacitor VII (29) is connected to the anode of the input terminal of optocoupler III (28) and the 3.3V power supply, and the other end is grounded.

9. The turntable motor protection circuit based on Hall elements according to claim 6, characterized in that: It also includes resistors V (14), VIII (22), and XI (30). One end of resistor V (14) is connected to the output of operational amplifier (8), and the other end is connected to the input cathode of optocoupler I (12). One end of resistor VIII (22) is connected to the output of operational amplifier (8), and the other end is connected to the input cathode of optocoupler II (20). One end of resistor XI (30) is connected to the output of operational amplifier (8), and the other end is connected to the input cathode of optocoupler III (28).

10. The turntable motor protection circuit based on Hall elements according to claim 6, characterized in that: It also includes resistors VI (17), VII (18), IX (25), X (26), XII (33), and X (34). The base of transistor I (15) is connected to one end of resistor VI (17) and one end of resistor VII (18), respectively. The other end of resistor VI (17) is connected to the emitter of the output terminal of optocoupler I (12), and the other end of resistor VII (18) is grounded. The base of transistor II (23) is connected to the... One end of resistor IX (25) and one end of resistor X (26) are connected. The other end of resistor IX (25) is connected to the emitter of the output terminal of optocoupler II (20). The other end of resistor X (26) is grounded. The base of transistor III (31) is connected to one end of resistor XII (33) and one end of resistor XIII (34). The other end of resistor XII (33) is connected to the emitter of the output terminal of optocoupler III (28). The other end of resistor XIII (34) is grounded.

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