CN207008023U - A kind of motor status detection means - Google Patents

Abstract

The utility model relates to a motor state detection device, comprising a central control module, the central control module is electrically connected with a current detection module, a voltage detection module, a fault detection module, a display module and a button module, the current detection module includes a temperature sensor, a current detection sensor , a gating circuit, a first detection circuit and a second detection circuit, the current detection sensor is electrically connected to the first detection circuit and the second detection circuit, the temperature sensor is electrically connected to the input end of the gating circuit, and the output end of the gating circuit The first detection circuit and the second detection circuit are respectively electrically connected. The utility model can select the detection circuit according to the ambient temperature and adjust the benchmark of overcurrent detection. When the temperature of the motor rises or falls, the standard of overcurrent is inconsistent, which avoids the damage caused by the overcurrent operation of the motor due to temperature changes. And when the motor is running normally, it will be forced to stop due to over-current alarm.

Description

A motor state detection device

technical field

The utility model relates to the technical field of electrical detection, in particular to a motor state detection device.

Background technique

Motor status detection can reflect the real-time status of the motor during operation, and can detect faults in time, and take corresponding measures to avoid damage to the motor due to power system faults and reduce damage caused by the motor itself.

Some current detection devices in the prior art can measure the real-time current of the motor. When an over-current phenomenon occurs, it can send a warning message in time and take corresponding protection measures to avoid damage to the motor components. However, the working place of the motor is different from the Factors such as seasons will cause the working environment temperature of the motor to be high, and the ambient temperature will have a certain impact on the current of the motor, which will increase or decrease the rated operating current of the motor. However, in the existing detection devices, the detection of the motor is generally not Considering environmental factors, in some cases, especially under high temperature conditions, the detection device cannot adjust the detection standard according to environmental changes, causing the motor to continue to run in an over-current state and causing damage to the motor, or the motor is running normally, but the detection results show too much. Current, forced shutdown affects the normal operation of the motor.

Utility model content

The technical problem to be solved by the utility model is to provide a motor state detection device that adjusts the overcurrent detection standard according to the temperature factor of the operating environment.

In order to solve the above technical problems, the technical solution of the present invention is: a motor state detection device, including a central control module, the central control module is electrically connected with a current detection module, a voltage detection module, a fault detection module, a display module and buttons Module, the current detection module includes a temperature sensor, a current detection sensor, a gating circuit, a first detection circuit and a second detection circuit, the current detection sensor is electrically connected to the first detection circuit and the second detection circuit, the The temperature sensor is electrically connected to the input end of the gating circuit, and the output end of the gating circuit is electrically connected to the first detection circuit and the second detection circuit respectively.

As a preferred technical solution, the current detection sensor is a Hall current detection sensor.

As a preferred technical solution, the gating circuit includes a first transistor and a second transistor, the base of the first transistor is connected in series with the normally closed contact of the temperature sensor, and the collector of the first transistor is electrically connected to To the gate terminal of the first detection circuit; the base of the second transistor is connected in series with the normally open contact of the temperature sensor, and the collector of the second transistor is electrically connected to the second detection circuit strobe terminal.

As a preferred technical solution, both the first detection circuit and the second detection circuit include a voltage comparator, the current detection sensor is electrically connected to the non-inverting input terminal of the voltage comparator, and the inversion of the voltage comparator Two adjustment resistors are connected to the input end, the output end of the voltage comparator is electrically connected to the central control module, and the gate end of the voltage comparator is electrically connected to the gate circuit.

As a preferred technical solution, the voltage comparator is a voltage comparator chip LM311.

Due to the adoption of the above technical scheme, the beneficial effects of the utility model are: the utility model is provided with two detection circuits, and the detection standards of the two detection circuits are different, and a suitable detection circuit is selected according to the temperature detection results of the temperature sensor. According to the ambient temperature, the detection circuit can be selected and the benchmark of overcurrent detection can be adjusted. When the temperature of the motor rises or falls, the standard of overcurrent is inconsistent, which avoids the damage caused by the overcurrent operation of the motor due to temperature changes, and the normal operation of the motor. During operation, it is forced to stop due to overcurrent alarm.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

Fig. 1 is the circuit block diagram of the utility model embodiment;

Fig. 2 is the circuit block diagram of the current detection module of the utility model embodiment;

FIG. 3 is a schematic circuit diagram of FIG. 2 .

detailed description

As shown in Figures 1 to 3, a motor state detection device includes a central control module, the central control module is electrically connected to a current detection module, a voltage detection module, a fault detection module, a display module and a button module, and the current detection The module includes a temperature sensor, a current detection sensor, a gating circuit, a first detection circuit and a second detection circuit, the current detection sensor is electrically connected to the first detection circuit and the second detection circuit, and the temperature sensor is electrically connected to the input end of the gating circuit , the output terminals of the gating circuit are electrically connected to the first detection circuit and the second detection circuit respectively.

Preferably, the current detection sensor is a Hall current detection sensor.

The gate circuit includes a first transistor Q1 and a second transistor Q2, the base of the first transistor Q1 is connected in series with the normally closed contact J1-1 of the temperature sensor, and the collector of the first transistor Q1 is electrically connected to the selector of the first detection circuit. On terminal: the base of the second transistor Q2 is connected in series with the normally open contact J1-2 of the temperature sensor, and the collector of the second transistor Q2 is electrically connected to the gate terminal of the second detection circuit.

The first detection circuit includes that the current detection sensor is electrically connected to the non-inverting input pin 2 of the voltage comparator IC1, and the inverting input pin 3 of the voltage comparator IC1 is connected to two adjustment resistors R3 and R4, and the adjustment resistor R3 is changed. The resistance value of R4 can adjust the size of the reference voltage. The output pin 7 of the voltage comparator IC1 is electrically connected to the first overcurrent detection terminal GL1 of the central control module, and the gate pin 6 of the voltage comparator IC1 is connected to the selection terminal. The collector of the first transistor Q1 in the pass circuit is electrically connected.

The second detection circuit includes a voltage comparator IC2, the current detection sensor is electrically connected to the non-inverting input pin 2 of the voltage comparator IC2, and the inverting input pin 3 of the voltage comparator IC2 is connected to two adjustment resistors R8, R9, The size of the reference voltage can be adjusted by changing the resistance values of the adjustment resistors R8 and R9. The output terminal pin 7 of the voltage comparator IC2 is electrically connected with the second overcurrent detection terminal GL2 of the central control module, and the gate terminal of the voltage comparator IC2 is connected to Pin 6 is electrically connected to the collector of the first transistor Q2 in the gate circuit.

Preferably, the voltage comparator IC1 and the voltage comparator IC2 are voltage comparator chips LM311.

When the temperature sensor detects that the temperature is lower than the set value, the transistor Q1 is turned on, and the first detection circuit works to detect the current; when the temperature sensor detects that the temperature is higher than the set value, the normally open contact J1-2 is closed , the normally closed contact J1-1 is opened, the transistor Q2 is turned on, and the second detection circuit works to detect the current.

The basic principles, main features and advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model The new model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

Claims (5)

1. A kind of 1. motor status detection means, it is characterised in that：Including middle control module, the middle control module is electrically connected with electric current inspection Survey module, voltage detection module, fault detection module, display module and key-press module, the current detection module include temperature Sensor, current detection sensor, gating circuit, the first detection circuit and the second detection circuit, the current detection sensor Electrically connected with the described first detection circuit and the second detection circuit, the input electricity of the temperature sensor and the gating circuit Connection, the gating circuit output end are electrically connected the first detection circuit and the second detection circuit.
2. A kind of 2. motor status detection means as claimed in claim 1, it is characterised in that：The current detection sensor is suddenly That current detection sensor.
3. A kind of 3. motor status detection means as claimed in claim 1, it is characterised in that：It is brilliant that the gating circuit includes first Body pipe and second transistor, the base stage of the first transistor are connected with the normally-closed contact of the temperature sensor, and described first The colelctor electrode of transistor is electrically connected to the gating end of the first detection circuit；The base stage of the second transistor and the temperature The normally opened contact series connection of sensor, the colelctor electrode of the second transistor are electrically connected to the gating end of the second detection circuit.
4. A kind of 4. motor status detection means as claimed in claim 1, it is characterised in that：The first detection circuit and second Detection circuit includes a voltage comparator, and the current detection sensor is electrically connected to the same mutually defeated of the voltage comparator Enter end, the inverting input of the voltage comparator is connected with two adjustment resistance, the output end of the voltage comparator and institute Middle control module electrical connection is stated, the gating end of the voltage comparator electrically connects with the gating circuit.
5. A kind of 5. motor status detection means as claimed in claim 4, it is characterised in that：The voltage comparator is voltage ratio Compared with device chip LM311.