Motor fault prompting circuit

Abstract

The utility model discloses a motor fault prompt circuit, belongs to the technical field of motor fault detection, and solves the problems that the fault of overheating in a motor needs to be prompted, and the phenomenon of rotation speed increase in the motor needs to be eliminated. The temperature sensor is used for detecting the temperature in the motor and feeding back a temperature signal; and the input end of the first voltage comparison circuit is coupled with the output end of the temperature sensor. When the device works, the temperature sensor detects the temperature in the motor casing and feeds back a signal to the voltage comparison circuit, and when the temperature exceeds a preset value, the first switch circuit is triggered to control the Hall sensor, and the timing circuit is started at the same time. The Hall sensor feeds back signals when the metal block rotates, and after comparison of the second voltage, if the signals are accumulated for four times within timing, the multi-stage judgment circuit outputs low level, the third switching circuit is not conducted, and the prompting lamp is not turned on, it is indicated that the high temperature and the high rotating speed are normal. Otherwise, the prompting lamp is turned on to indicate a fault.

Description

Technical Field

[0001] The utility model relates to the technical field of motor fault detection, in particular to a motor fault prompt circuit. Background Art

[0002] Motor overheating is a common fault phenomenon that can be caused by a variety of factors and can seriously impact motor performance and lifespan. Generally speaking, motor overheating can be caused by factors such as excessive load, unstable power supply voltage, poor heat dissipation, high ambient temperature, and internal motor faults. For example, when a motor is running under load, current flowing through the windings and core generates heat. If this heat cannot be dissipated promptly, the motor will overheat. Overheating not only affects motor performance but can also damage insulation materials, reduce motor lifespan, and even cause safety hazards such as fire.

[0003] At the same time, when the motor's output shaft rotates too fast, heat will rise. This is a normal heat rise caused by the increase in the current value in the motor, and it is not a fault. Therefore, it is necessary to prompt the fault of internal motor overheating and eliminate the phenomenon of increased motor speed.

[0004] Therefore, a motor fault prompt circuit is proposed to solve or alleviate the above problems. Utility Model Content

[0005] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a motor fault prompt circuit.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A motor fault prompt circuit, comprising

[0008] A temperature sensor is used to detect the temperature inside the motor and provide feedback of the temperature signal;

[0009] a first voltage comparison circuit, wherein an input terminal of the first voltage comparison circuit is coupled to an output terminal of the temperature sensor, and the first voltage comparison circuit feeds back a first comparison signal in response to the temperature signal being greater than a preset temperature reference signal;

[0010] a first switch circuit, wherein an input terminal of the first switch circuit is coupled to an output terminal of the first voltage comparison circuit, and the first switch circuit controls a path thereof in response to a first comparison signal;

[0011] A Hall sensor and a metal block, wherein the metal block is arranged on an output shaft of the motor, and the Hall sensor is arranged on a housing of the motor and outputs a Hall signal in response to the metal block approaching;

[0012] a second voltage comparison circuit, wherein an input terminal of the second voltage comparison circuit is coupled to an output terminal of the Hall sensor, and the second voltage comparison circuit feeds back a second comparison signal in response to the Hall signal being greater than a preset Hall reference signal;

[0013] a timing circuit, wherein an input terminal of the timing circuit is coupled to an output terminal of the first voltage comparison circuit, and the timing circuit starts timing in response to the first comparison signal and outputs a timing signal within a timing time;

[0014] a second switch circuit, wherein an input terminal of the second switch circuit is coupled to an output terminal of the timing circuit, and the second switch circuit controls a path thereof in response to a timing signal;

[0015] a counting circuit, wherein an input terminal of the counting circuit is coupled to an output terminal of the second voltage comparison circuit via a second switch circuit, and the counting circuit generates a counting signal in response to the second comparison signal;

[0016] a multi-stage judgment circuit, wherein each input terminal of the multi-stage judgment circuit is coupled to each output terminal of the counting circuit, and the multi-stage judgment circuit outputs a judgment signal in response to all counting signals;

[0017] The multi-stage judgment circuit is coupled to a warning light via the third switching circuit, and the third switching circuit controls the warning light to be powered off in response to the judgment signal.

[0018] Preferably, the first voltage comparison circuit and the second voltage comparison circuit both include a first voltage comparator.

[0019] Preferably, the first switch circuit, the second switch circuit, and the third switch circuit all include triode switch circuits.

[0020] Preferably, the timing circuit includes an inverter and a minimum system based on a 555 time base chip, and the output end of the inverter is coupled to the input end of the minimum system based on the 555 time base chip.

[0021] Preferably, the counting circuit includes four D flip-flops.

[0022] Preferably, the multi-stage judgment circuit includes a first AND gate circuit, a second AND gate circuit, and a NAND gate circuit, the two input terminals of the first AND gate circuit are coupled to the first and second output terminals of the counting circuit, one input terminal of the second AND gate circuit is coupled to the output terminal of the first AND gate circuit, another input terminal of the second AND gate circuit is coupled to the third output terminal of the counting circuit, one input terminal of the NAND gate circuit is coupled to the output terminal of the second AND gate circuit, and another input terminal of the NAND gate circuit is coupled to the fourth output terminal of the counting circuit.

[0023] The utility model has the following beneficial effects:

[0024] During operation, the temperature sensor detects the temperature inside the motor housing and feeds a signal back to the voltage comparison circuit. When the temperature exceeds a preset value, the first switch circuit triggers the Hall effect sensor, simultaneously activating the timing circuit. The Hall effect sensor feeds back a signal as the metal block rotates. After a second voltage comparison, if the signal accumulates four times within the timing, the multi-level judgment circuit outputs a low level, the third switch circuit becomes non-conductive, and the indicator light turns off, indicating normal high temperature and high speed. Otherwise, the indicator light turns on, indicating a fault. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 It is a structural block diagram of the utility model;

[0027] Figure 2 This is a wiring diagram of the temperature sensor, the first voltage comparison circuit, the first switch circuit, the Hall sensor, the second voltage comparison circuit, and the second switch circuit in the present invention;

[0028] Figure 3 This is the wiring diagram of the timing circuit in the present utility model;

[0029] Figure 4 This is the wiring diagram of the counting circuit in the present utility model;

[0030] Figure 5 This is a wiring diagram of the multi-stage judgment circuit and the third switch circuit in the utility model.

[0031] 1. Temperature sensor; 2. First voltage comparison circuit; 3. Timing circuit; 4. First switching circuit; 5. Hall sensor; 6. Second voltage comparison circuit; 7. Second switching circuit; 8. Counting circuit; 9. Multi-level judgment circuit; 10. Third switching circuit; 11. Warning light. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0035] In the description of the present invention, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the utility model product is usually placed when in use, or are the orientation or position relationship commonly understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] Furthermore, the terms “first,” “second,” “third,” etc., are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0037] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0038] A motor fault prompt circuit, such as Figure 1As shown, it includes a temperature sensor 1, a first voltage comparison circuit 2, a first switching circuit 4, a Hall sensor 5 and a metal block, a second voltage comparison circuit 6, a timing circuit 3, a second switching circuit 7, a counting circuit 8, a multi-level judgment circuit 9, a third switching circuit 10, and a warning light 11.

[0039] like Figure 1 and Figure 2 As shown, the temperature sensor 1 is used to detect the temperature inside the motor and feed back a temperature signal; the input end of the first voltage comparison circuit 2 is coupled to the output end of the temperature sensor 1, and the first voltage comparison circuit 2 feeds back a first comparison signal in response to the temperature signal being greater than a preset temperature reference signal; the input end of the first switch circuit 4 is coupled to the output end of the first voltage comparison circuit 2, and the first switch circuit 4 controls its path in response to the first comparison signal; the metal block is used to be set on the output shaft of the motor, and the Hall sensor 5 is used to be set on the housing of the motor and outputs a Hall signal in response to the metal block approaching; the input end of the second voltage comparison circuit 6 is coupled to the output end of the Hall sensor 5, and the second voltage comparison circuit 6 feeds back a second comparison signal in response to the Hall signal being greater than a preset Hall reference signal; The input end of the timing circuit 3 is coupled to the output end of the first voltage comparison circuit 2, and the timing circuit 3 starts timing in response to the first comparison signal and outputs a timing signal within the timing time; the input end of the second switch circuit 7 is coupled to the output end of the timing circuit 3, and the second switch circuit 7 controls its path in response to the timing signal; the input end of the counting circuit 8 is coupled to the output end of the second voltage comparison circuit 6 through the second switch circuit 7, and the counting circuit 8 counts the signal in response to the second comparison signal; each input end of the multi-level judgment circuit 9 is coupled to each output end of the counting circuit 8, and the multi-level judgment circuit 9 outputs a judgment signal in response to all counting signals; the multi-level judgment circuit 9 is coupled to the prompt light 11 through the third switch circuit 10, and the third switch circuit 10 controls the prompt light 11 to be powered off in response to the judgment signal.

[0040] The first voltage comparison circuit 2 and the second voltage comparison circuit 6 each include a first voltage comparator, and the first switch circuit 4 , the second switch circuit 7 , and the third switch circuit 10 each include a triode switch circuit.

[0041] like Figure 3 As shown, the timing circuit 3 includes an inverter and a minimum system based on a 555 time base chip. The output end of the inverter is coupled to the input end of the minimum system based on a 555 time base chip, as shown in FIG. Figure 4 As shown, the counting circuit 8 includes four D flip-flops.

[0042] like Figure 5As shown, the multi-stage judgment circuit 9 includes a first AND gate circuit, a second AND gate circuit, and a NAND gate circuit. The two input terminals of the first AND gate circuit are coupled to the first and second output terminals of the counting circuit 8, one input terminal of the second AND gate circuit is coupled to the output terminal of the first AND gate circuit, another input terminal of the second AND gate circuit is coupled to the third output terminal of the counting circuit 8, one input terminal of the NAND gate circuit is coupled to the output terminal of the second AND gate circuit, and another input terminal of the NAND gate circuit is coupled to the fourth output terminal of the counting circuit 8.

[0043] When the present invention is working, the temperature sensor 1 detects the temperature inside the motor casing and feeds back a temperature signal. The temperature signal is given to the first voltage comparison circuit 2. The first voltage comparison circuit 2 feeds back a first comparison signal in response to the temperature signal being greater than a preset temperature reference signal. The first comparison signal is simultaneously given to the base of the first switch circuit 4 and the inverter in the timing circuit 3. In this way, the first switch circuit 4 controls the Hall sensor 5 to be energized. The Hall sensor 5 can feed back a Hall signal when the output shaft of the motor drives the metal block to rotate. After the first comparison signal is reversed and the level is reduced in the inverter, the timing circuit 3 starts timing, and outputs a timing signal to the base of the second switch circuit 7 during the timing time. After the Hall signal is given to the second voltage comparison circuit 6, the second voltage comparison circuit 6 responds. After the Hall signal is greater than the preset Hall reference signal, the second comparison signal is fed back to the collector of the second switch circuit 7. After the base of the second switch circuit 7 responds to the timing signal, the collector and emitter of the second switch circuit 7 are turned on, and the second comparison signal is transmitted to the counting circuit 8 for counting. After counting once, a counting signal is output. After the counting signal is given to the multi-level judgment circuit 9 a total of four times within the timing time, the multi-level judgment circuit 9 can finally output a low-level judgment signal to the base of the third switch circuit 10. Then the collector and emitter of the third switch circuit 10 cannot be turned on, and the warning light 11 cannot light up. This indicates that the temperature is high and the speed of the motor is high, so the temperature increase is normal. On the contrary, if the warning light 11 lights up, it means that the temperature increase is abnormal and there is a fault.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A motor fault prompt circuit, characterized in that: include A temperature sensor (1) is used to detect the temperature inside the motor and feed back a temperature signal; a first voltage comparison circuit (2), wherein an input end of the first voltage comparison circuit (2) is coupled to an output end of the temperature sensor (1), and the first voltage comparison circuit (2) feeds back a first comparison signal in response to the temperature signal being greater than a preset temperature reference signal; a first switch circuit (4), wherein an input end of the first switch circuit (4) is coupled to an output end of the first voltage comparison circuit (2), and the first switch circuit (4) controls its path in response to a first comparison signal; A Hall sensor (5) and a metal block, wherein the metal block is arranged on an output shaft of a motor, and the Hall sensor (5) is arranged on a housing of the motor and outputs a Hall signal in response to the metal block approaching; a second voltage comparison circuit (6), wherein an input end of the second voltage comparison circuit (6) is coupled to an output end of the Hall sensor (5), and the second voltage comparison circuit (6) feeds back a second comparison signal in response to the Hall signal being greater than a preset Hall reference signal; a timing circuit (3), wherein an input end of the timing circuit (3) is coupled to an output end of the first voltage comparison circuit (2), and the timing circuit (3) starts timing in response to the first comparison signal and outputs a timing signal within the timing time; a second switch circuit (7), wherein an input end of the second switch circuit (7) is coupled to an output end of the timing circuit (3), and the second switch circuit (7) controls its path in response to a timing signal; a counting circuit (8), wherein an input end of the counting circuit (8) is coupled to an output end of a second voltage comparison circuit (6) via a second switch circuit (7), and the counting circuit (8) generates a counting signal in response to a second comparison signal; a multi-stage judgment circuit (9), wherein each input terminal of the multi-stage judgment circuit (9) is coupled to each output terminal of the counting circuit (8), and the multi-stage judgment circuit (9) outputs a judgment signal in response to all counting signals; A third switch circuit (10), wherein the multi-stage judgment circuit (9) is coupled to a warning light (11) via the third switch circuit (10), and the third switch circuit (10) controls the warning light (11) to be powered off in response to a judgment signal.

2. A motor fault prompt circuit according to claim 1, characterized in that: The first voltage comparison circuit (2) and the second voltage comparison circuit (6) both include a first voltage comparator.

3. A motor fault prompt circuit according to claim 1, characterized in that: The first switch circuit (4), the second switch circuit (7), and the third switch circuit (10) all comprise triode switch circuits.

4. A motor fault prompt circuit according to claim 1, characterized in that: The timing circuit (3) comprises an inverter and a minimum system based on a 555 time base chip, wherein the output end of the inverter is coupled to the input end of the minimum system based on the 555 time base chip.

5. A motor fault prompt circuit according to claim 1, characterized in that: The counting circuit (8) includes four D flip-flops.

6. A motor fault prompt circuit according to claim 1, characterized in that: The multi-stage judgment circuit (9) includes a first AND gate circuit, a second AND gate circuit, and a NAND gate circuit, wherein the two input terminals of the first AND gate circuit are coupled to the first and second output terminals of the counting circuit (8), one input terminal of the second AND gate circuit is coupled to the output terminal of the first AND gate circuit, another input terminal of the second AND gate circuit is coupled to the third output terminal of the counting circuit (8), one input terminal of the NAND gate circuit is coupled to the output terminal of the second AND gate circuit, and another input terminal of the NAND gate circuit is coupled to the fourth output terminal of the counting circuit (8).

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