Rotating speed identification and fault detection circuit of direct current motor

Abstract

The utility model relates to a rotating speed identification and fault detection circuit of a DC motor. The circuit comprises a control circuit, an output detection circuit, a DC motor rotating speed identification circuit and a fault detection circuit. The direct-current motor rotating speed identification and fault detection circuit is simple in design, complete in function, convenient to implement and suitable for being integrated in other direct-current motor monitoring equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of motor speed identification and fault detection, in particular to a technology of a DC motor speed identification and fault detection circuit. Background Art

[0002] In current life and work, the use of motors is very common. In actual use, it is often necessary to monitor the working status of the motor in real time, so an effective detection circuit is needed to achieve this. Especially in recent years, the application of DC motors has become more and more widespread, penetrating into every corner of life. There are also some speed recognition products on the market that solve some of the needs. The technology of speed recognition and fault detection of DC motors needs to be further improved to reduce costs and improve functions and reliability.

[0003] Defects and shortcomings of the existing technology:

[0004] The cost of DC motor detection technology is not well controlled and its functions are not comprehensive enough, especially when combined with fault detection functions. The market is in urgent need of related technologies. Summary of the invention

[0005] In view of the deficiencies in the prior art, the utility model provides a technical solution for a speed identification and fault detection circuit of a DC motor, which solves the technical problems of the prior art in speed identification and fault identification of DC motors.

[0006] According to the design scheme provided by the utility model, the utility model relates to a DC motor speed identification and fault detection circuit, including a control circuit, an output detection circuit, a DC motor speed identification circuit and a fault detection circuit. The output of the control circuit is connected to the DC motor for controlling the power supply of the DC motor; the output detection circuit is connected to the normally closed output FO of the control circuit, and the level of the output signal CHECK1 represents the state of the normally closed output FO, indicating whether FO has power output; the DC motor speed identification circuit is connected in series to the power supply circuit of the DC motor, and the speed signal VOUT is output, and VOUT can be connected to other devices for analog quantity calculation, and the VOUT voltage value is calculated, and the corresponding DC motor speed represented by different voltage values; the fault detection module is connected in series to the DC motor power supply circuit, and the output signal is AC_CHECK. When the DC motor fails or drops the line, the AC_CHECK signal outputs a signal, indicating that the DC motor fails.

[0007] As mentioned above, the control circuit uses a relay, and the output includes a normally closed output FO and a normally open output FC1, either of which can be connected to a DC motor. According to the needs of external applications, the normally closed output FO or the normally open output FC1 can be selected.

[0008] Furthermore, the output detection circuit includes a detection output signal CHECK2 of the normally open output FC1, and the level of the CHECK2 signal represents the state of the control output FC1. The state of the normally open output is detected according to the needs of external use.

[0009] Preferably, the DC motor speed identification module includes a current acquisition chip, which acquires the working current of the DC motor. The current acquisition output signal is converted by an operational amplifier and then output as VOUT.

[0010] Preferably, in the fault detection module, the DC motor working power supply FO1 outputs FOUT after passing through the fault detection module, and the fault detection module outputs a signal AC_CHECK for identifying whether the DC motor is normal.

[0011] Beneficial effects of the utility model:

[0012] The utility model has a scientific and reasonable design and high cost performance. It is compatible with DC motor speed identification and fault detection and diagnosis. The circuit is simple and easy to be integrated into DC motor control equipment, and has great prospects in market application.

[0013] The advantages of the invention are as follows: 1. The circuit of the utility model design is simple and cost-effective.

[0014] 2. The designed product has complete functions, including DC motor speed identification and fault detection.

[0015] 3. Easy to integrate into the controller of DC motor and flexible in application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a control circuit;

[0017] Figure 2 is an output detection circuit;

[0018] Figure 3 is a DC motor speed identification circuit;

[0019] Figure 4 shows the fault detection circuit. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and technical solutions, and the implementation methods of the present invention will be described in detail through preferred embodiments, but the implementation methods of the present invention are not limited thereto.

[0021] Example 1, see Figure 1 to Figure 4As shown, according to the design scheme provided by the utility model, the utility model relates to a DC motor speed identification and fault detection circuit, including a control circuit, an output detection circuit, a DC motor speed identification circuit and a fault detection circuit. The output of the control circuit is connected to the DC motor for controlling the power supply of the DC motor; the output detection circuit is connected to the normally closed output FO of the control circuit, and the level of the output signal CHECK1 represents the state of the normally closed output FO, indicating whether FO has power output; the DC motor speed identification circuit is connected in series to the power supply circuit of the DC motor, and the speed signal VOUT is output, and VOUT can be connected to other devices for analog quantity calculation, and the VOUT voltage value is calculated, and the corresponding DC motor speed represented by different voltage values; the fault detection module is connected in series to the DC motor power supply circuit, and the output signal is AC_CHECK. When the DC motor fails or drops off the line, the AC_CHECK signal outputs a signal, indicating that the DC motor fails.

[0022] The control circuit uses a relay, and the output includes a normally closed output FO and a normally open output FC1, either of which can be connected to a DC motor. According to the needs of external applications, the normally closed output FO or the normally open output FC1 can be selected.

[0023] The output detection circuit includes a detection output signal CHECK2 of the normally open output FC1, and the level of the CHECK2 signal represents the state of the control output FC1. The normally open output state is detected according to the needs of external use.

[0024] The DC motor speed identification module comprises a current acquisition chip, which acquires the working current of the DC motor. The current acquisition output signal is converted by an operational amplifier and then output as VOUT.

[0025] In the fault detection module, the DC motor working power supply FO1 outputs FOUT after passing through the fault detection module, and the fault detection module outputs a signal AC_CHECK for identifying whether the DC motor is normal.

[0026] The present invention is not limited to the above specific implementations, and those skilled in the art may make various changes accordingly. However, any changes that are equivalent or similar to the present invention should be included in the scope of the claims of the present invention.

Claims

1. A DC motor speed identification and fault detection circuit, comprising a control circuit, an output detection circuit, a DC motor speed identification circuit and a fault detection circuit; characterized in that: The output of the control circuit is connected to the DC motor; the output detection circuit is connected to the normally closed output FO of the control circuit, and the level of the output signal CHECK1 represents the state of the normally closed output FO; the DC motor speed identification circuit is connected in series to the power supply circuit of the DC motor, and outputs a speed signal VOUT; the fault detection module is connected in series to the power supply circuit of the DC motor, and the output signal is AC_CHECK.

2. The DC motor speed identification and fault detection circuit according to claim 1, characterized in that: The control circuit uses a relay, and the output includes a normally closed output FO and a normally open output FC1.

3. A DC motor speed identification and fault detection circuit according to claim 1 or 2, characterized in that: The output detection circuit includes a detection output signal CHECK2 of the normally open output FC1, and the level of CHECK2 represents the state of the normally open output FC1.

4. The DC motor speed identification and fault detection circuit according to claim 1, characterized in that: The DC motor speed identification circuit comprises a current acquisition chip, which acquires the working current of the DC motor. The current acquisition output signal is converted by an operational amplifier and then output as VOUT.

5. The DC motor speed identification and fault detection circuit according to claim 1, characterized in that: In the fault detection module, the DC motor working power supply FO1 outputs FOUT after passing through the fault detection module, and the fault detection module outputs a signal AC_CHECK.

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