CN210720450U - Motor speed measuring device - Google Patents
Motor speed measuring device Download PDFInfo
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- CN210720450U CN210720450U CN201922316206.6U CN201922316206U CN210720450U CN 210720450 U CN210720450 U CN 210720450U CN 201922316206 U CN201922316206 U CN 201922316206U CN 210720450 U CN210720450 U CN 210720450U
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Abstract
The utility model relates to a motor speed sensor, this motor speed sensor includes: the device comprises a processor module, a power supply module, a sampling module and a signal conditioning module; wherein the power module is adapted to power a dc motor; the sampling module is suitable for acquiring a voltage signal of the direct current motor, and the signal conditioning module is used for conditioning the signal and then sending the signal to the processor module, namely the processor module is suitable for measuring the rotating speed of the direct current motor according to the conditioned voltage signal; the utility model discloses an when direct current motor high-speed operation, measure through the magnetic leakage that produces direct current motor maincenter and inside brush contact, can realize electromagnetic signal's conversion through electromagnetic induction to send through signal conditioning module and carry out pulse detection for processor module, in order to realize testing the speed, make measuring result receive external disturbance little, improved measuring sensitivity.
Description
Technical Field
The utility model relates to a direct current motor control field especially relates to a motor speed sensor.
Background
The direct current motor is a main driving module of the electric vehicle, and the stability of the rotating speed of the direct current motor is one of important factors for measuring the quality of the electric vehicle.
Because direct current motor is in the rotation process, the condition such as rotational speed unstability or shake can appear in the motor, and traditional measuring method all adopts hall sensor direct measurement, but because motor rotational speed is too high, is difficult to realize effective measurement.
Therefore, it is necessary to develop a new motor speed measuring device to solve the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a motor speed sensor to solve the problem of how to acquire direct current motor's operating voltage in order to measure the rotational speed.
In order to solve the technical problem, the utility model provides a motor speed measuring device, it includes: the device comprises a processor module, a power supply module, a sampling module and a signal conditioning module; wherein the power module is adapted to power a dc motor; the sampling module is suitable for acquiring a voltage signal of the direct current motor, and the signal conditioning module is used for conditioning the signal and then sending the signal to the processor module, namely the processor module is suitable for measuring the rotating speed of the direct current motor according to the conditioned voltage signal.
Furthermore, the sampling module is suitable for being electrically connected with the direct current motor through a sampling resistor so as to obtain a voltage signal of the direct current motor.
Further, the power supply module is suitable for supplying power by adopting a DC-DC voltage stabilizing chip.
Further, the signal conditioning module comprises: a filter circuit and an amplifier circuit; the filter circuit is suitable for filtering the voltage signals, amplifying the voltage signals through the amplifying circuit and then sending the amplified voltage signals to the processor module.
Further, the filter circuit is suitable for filtering high-frequency clutter of the voltage signal by adopting a Butterworth second-order low-pass filter.
Further, the amplifying circuit is suitable for amplifying the voltage signal through an operational amplifier.
Further, the operational amplifier is adapted to employ an LM324 operational amplifier.
Further, the motor speed measuring device also comprises a display module electrically connected with the processor module; the processor module is suitable for displaying the rotating speed of the direct current motor through the display module.
The beneficial effects of the utility model are that, the utility model discloses an when direct current motor high-speed operation, measure through the magnetic leakage that produces direct current motor maincenter and inside brush contact, can realize electromagnetic signal's conversion through electromagnetic induction to send through signal conditioning module and carry out pulse detection for processor module, with the realization is tested the speed, make measuring result receive external disturbance little, improved measuring sensitivity.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic block diagram of the motor speed measuring device of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
Example 1
Fig. 1 is a schematic block diagram of the motor speed measuring device of the present invention.
In this embodiment, as shown in fig. 1, the present embodiment provides a motor speed measuring device, which includes: the device comprises a processor module, a power supply module, a sampling module and a signal conditioning module; wherein the power module is adapted to power a dc motor; the sampling module is suitable for acquiring a voltage signal of the direct current motor, and the signal conditioning module is used for conditioning the signal and then sending the signal to the processor module, namely the processor module is suitable for measuring the rotating speed of the direct current motor according to the conditioned voltage signal.
In this embodiment, when the dc motor operates at a high speed, the magnetic leakage generated by the contact between the dc motor center and the internal electric brush is measured, the electromagnetic signal conversion can be realized through electromagnetic induction, and the signal conditioning module sends the electromagnetic signal to the processor module for pulse detection, so as to realize speed measurement, so that the measurement result is less interfered by the outside, and the measurement sensitivity is improved.
In this embodiment, the processor module may be, but is not limited to, an STC12C5a60S2 single chip microcomputer.
Specifically, as an optional implementation manner, the sampling module is adapted to be electrically connected to the dc motor through a sampling resistor to obtain a voltage signal of the dc motor.
Specifically, as an alternative embodiment, the power supply module is adapted to use a DC-DC voltage stabilization chip for power supply.
In the embodiment, the DC-DC voltage stabilizing chip is adopted for supplying power, so that the circuit can stably work under the support of an accurate and stable power supply; compared with the traditional series voltage-stabilized power supply, the DC-DC voltage-stabilized chip has small output ripple coefficient, and the THD meets the working requirement of the motor speed measuring device.
Specifically, as an optional implementation manner, the signal conditioning module includes: a filter circuit and an amplifier circuit; the filter circuit is suitable for filtering the voltage signals, amplifying the voltage signals through the amplifying circuit and then sending the amplified voltage signals to the processor module.
Specifically, as an optional implementation manner, the filter circuit is adapted to filter out high-frequency noise of the voltage signal by using a butterworth second-order low-pass filter.
In this embodiment, the electromagnetically induced voltage signal has a complex high-frequency interference component, so that the performance of the low-pass filter is particularly important, and the low-pass filter is a butterworth second-order low-pass filter with good frequency-selective characteristic.
In particular, as an alternative embodiment, the amplifying circuit is adapted to amplify the voltage signal by an operational amplifier.
In particular, as an alternative embodiment, the operational amplifier is adapted to adopt an LM324 operational amplifier.
In this embodiment, in order to ensure that the weak signal can be effectively amplified, and at the same time, the amplification factor is too large, especially the amplification factor of the preamplifier is controlled within 3 times, so the operational amplifier uses the LM324 operational amplifier.
Specifically, as an optional implementation manner, the motor speed measuring device further comprises a display module electrically connected with the processor module; the processor module is suitable for displaying the rotating speed of the direct current motor through the display module.
In this embodiment, the display module may be, but is not limited to, an LCD12864 display module.
To sum up, the utility model discloses an when direct current motor high-speed operation, measure through the magnetic leakage that produces direct current motor maincenter and inside brush contact, can realize electromagnetic signal's conversion through electromagnetic induction to send through signal conditioning module and carry out pulse detection for processor module, in order to realize testing the speed, make measuring result receive external disturbance little, improved measuring sensitivity.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (8)
1. A motor speed measuring device is characterized by comprising:
the device comprises a processor module, a power supply module, a sampling module and a signal conditioning module; wherein
The power supply module is suitable for supplying power to the direct current motor;
the sampling module is suitable for acquiring a voltage signal of the direct current motor, and the voltage signal is sent to the processor module after being conditioned by the signal conditioning module, namely
The processor module is suitable for measuring the rotating speed of the direct current motor according to the conditioned voltage signal.
2. An electrical motor speed measurement device according to claim 1,
the sampling module is suitable for being electrically connected with the direct current motor through a sampling resistor so as to obtain a voltage signal of the direct current motor.
3. An electrical motor speed measurement device according to claim 1,
the power supply module is suitable for supplying power by adopting a DC-DC voltage stabilizing chip.
4. An electrical motor speed measurement device according to claim 1,
the signal conditioning module comprises: a filter circuit and an amplifier circuit;
the filter circuit is suitable for filtering the voltage signals, amplifying the voltage signals through the amplifying circuit and then sending the amplified voltage signals to the processor module.
5. An electrical motor tachometer apparatus according to claim 4,
the filter circuit is suitable for filtering high-frequency clutter of the voltage signal by adopting a Butterworth second-order low-pass filter.
6. An electrical motor tachometer apparatus according to claim 4,
the amplifying circuit is suitable for amplifying the voltage signal through an operational amplifier.
7. A device for measuring the speed of an electric motor according to claim 6,
the operational amplifier is adapted to employ an LM324 operational amplifier.
8. An electrical motor speed measurement device according to claim 1,
the motor speed measuring device also comprises a display module electrically connected with the processor module;
the processor module is suitable for displaying the rotating speed of the direct current motor through the display module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922316206.6U CN210720450U (en) | 2019-12-21 | 2019-12-21 | Motor speed measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922316206.6U CN210720450U (en) | 2019-12-21 | 2019-12-21 | Motor speed measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210720450U true CN210720450U (en) | 2020-06-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922316206.6U Active CN210720450U (en) | 2019-12-21 | 2019-12-21 | Motor speed measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210720450U (en) |
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2019
- 2019-12-21 CN CN201922316206.6U patent/CN210720450U/en active Active
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