CN214473448U - Brushless motor rotating speed measuring device - Google Patents
Brushless motor rotating speed measuring device Download PDFInfo
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- CN214473448U CN214473448U CN202120286519.6U CN202120286519U CN214473448U CN 214473448 U CN214473448 U CN 214473448U CN 202120286519 U CN202120286519 U CN 202120286519U CN 214473448 U CN214473448 U CN 214473448U
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Abstract
The utility model provides a brushless motor rotational speed measuring device, include: the differential amplifier circuit comprises a first input end and a second input end, the first input end is connected with one phase signal in three-phase power supply signals of the brushless motor, and the second input end is connected with the other phase signal in the three-phase power supply signals of the brushless motor; the data processing circuit is used for receiving the second waveform signal and outputting the rotating speed of the brushless motor, and the display is used for displaying the real-time rotating speed of the motor. The utility model provides a brushless motor rotational speed measuring device, through setting up differential amplifier circuit, hysteresis comparison circuit, signal conditioning circuit, data processing circuit and the display that connects in order, realized the automatic measurement of brushless motor rotational speed, had low cost, simple structure, advantage that measuring result is accurate.
Description
Technical Field
The utility model relates to an electronic measurement technical field especially relates to a brushless motor rotational speed measuring device.
Background
In the fields of micro-miniature power aerostats and unmanned aerial vehicles, brushless motors are very widely applied, the rotating speed is taken as one of important parameters of the motors, and the rotating speed of the motors is acquired in real time in the using process and is a necessary index for product design.
In the existing measurement scheme, a laser device or a Hall device is mostly adopted to detect the rotating speed value of a motor, the indirect measurement is adopted, and the measurement result is inaccurate due to the fact that the motor is easily interfered by an external light source or electromagnetism under a complex use environment; on the other hand, for cost-sensitive applications, laser devices and hall devices are expensive and not easily accepted.
SUMMERY OF THE UTILITY MODEL
Problem to prior art existence, the utility model provides a brushless motor rotational speed measuring device, include: differential amplifier circuit, hysteresis comparison circuit, signal conditioning circuit, data processing circuit and the display of connecting in order, wherein: the differential amplification circuit comprises a first input end and a second input end, wherein the first input end is connected with one phase signal in three-phase power supply signals of the brushless motor, and the second input end is connected with the other phase signal in the three-phase power supply signals of the brushless motor; the differential amplifying circuit is used for generating a first waveform signal; the hysteresis comparison circuit is used for receiving the first waveform signal and generating a second waveform signal; the signal conditioning circuit is used for pre-conditioning the second waveform signal; the data processing circuit is used for receiving the second waveform signal and outputting the rotating speed of the brushless motor; the display is used for displaying the rotating speed of the brushless motor.
According to the utility model provides a brushless motor rotational speed measuring device, data processing circuit includes counter and multiplier, wherein, the counter includes first input interface and first output interface, the multiplier includes second input interface, third input interface and second output interface; the first input interface of the counter is connected with the output of the signal conditioning circuit, and the first output interface of the counter outputs the frequency of the second waveform signal; the input of the second input interface of the multiplier is set to the number of coils of the brushless motor; the third input interface of the multiplier is connected with the first output interface of the counter, and receives the frequency of the second waveform signal; the second output interface of the multiplier outputs the rotating speed of the brushless motor.
According to the utility model provides a pair of brushless motor rotational speed measuring device, first wave form signal is sine wave signal, second wave form signal is the rectangular wave signal.
According to the utility model provides a brushless motor speed measuring device, the difference amplifier circuit includes first operational amplifier, first resistance, second resistance, third resistance, fourth resistance, first electric capacity and second electric capacity; wherein: the first end of the first resistor is the first input end, and the first end of the second resistor is the second input end; the second end of the first resistor is connected with the same-direction input end of the first operational amplifier, the first end of the third resistor and the first end of the first capacitor; the second end of the third resistor and the second end of the first capacitor are connected with a power ground; the second end of the second resistor is connected with the inverting input end of the first operational amplifier, the first end of the second capacitor and the first end of the fourth resistor; and the second end of the second capacitor and the second end of the fourth resistor are connected with the output end of the first operational amplifier.
According to the utility model provides a pair of brushless motor rotational speed measuring device, hysteresis comparison circuit includes second operational amplifier, fifth resistance, sixth resistance, seventh resistance and eighth resistance, wherein: a first end of the sixth resistor is connected with the output end of the first operational amplifier, and a second end of the sixth resistor is connected with the inverting input end of the second operational amplifier; a first end of the fifth resistor is connected with a power ground, and a second end of the fifth resistor is connected with a non-inverting input end of the second operational amplifier; the first end of the eighth resistor is connected with the second end of the fifth resistor, the second end of the eighth resistor is connected with the second end of the seventh resistor, and the first end of the seventh resistor is connected with the output end of the second operational amplifier.
According to the utility model provides a pair of brushless motor rotational speed measuring device, signal conditioning circuit includes first diode and ninth resistance, wherein: the anode of the first diode is connected with the second end of the seventh resistor, the cathode of the first diode is connected with the first end of the ninth resistor, and the second end of the ninth resistor is connected with the power ground.
According to the utility model provides a pair of brushless motor rotational speed measuring device, data processing circuit's input is connected the first end of ninth resistance.
The utility model provides a brushless motor rotational speed measuring device, through setting up differential amplifier circuit, hysteresis comparison circuit, signal conditioning circuit, data processing circuit and the display that connects in order, realized the automatic measurement of brushless motor rotational speed, had low cost, simple structure, advantage that measuring result is accurate.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following briefly introduces the drawings required for the embodiments or the prior art descriptions, and obviously, the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a brushless motor rotation speed measuring device provided by the present invention;
fig. 2 is a schematic view of an application of the brushless motor rotation speed measuring device provided by the present invention;
fig. 3 is a schematic view of a part of the structure of the device for measuring the rotation speed of the brushless motor according to the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer, the drawings of the present invention are combined to clearly and completely describe the technical solutions of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The brushless motor rotation speed measuring device according to the present invention will be described with reference to fig. 1 to 3.
Fig. 1 is a schematic structural diagram of a brushless motor rotation speed measuring device provided by the present invention. As shown in fig. 1, the brushless motor rotation speed measuring device includes a differential amplifying circuit 10, a hysteresis comparing circuit 20, a signal conditioning circuit 30, a data processing circuit 40 and a display 50, which are connected in sequence, wherein: the differential amplifying circuit 10 includes a first input terminal connected to one of the three-phase power supply signals of the brushless motor, and a second input terminal connected to the other of the three-phase power supply signals of the brushless motor; the differential amplifying circuit 10 is used for generating a first waveform signal; the hysteresis comparison circuit 20 is configured to receive the first waveform signal and generate a second waveform signal; the signal conditioning circuit 30 is configured to pre-condition the second waveform signal; the data processing circuit 40 is configured to receive the second waveform signal and output a rotation speed of the brushless motor; the display 50 is used for displaying the rotating speed of the brushless motor.
The phase line connected with the coil of the brushless motor can output a waveform signal in the rotation process of the brushless motor, and the frequency of the waveform signal changes along with the change of the rotation speed of the motor. After any two-phase signal in three-phase power supply signals of the brushless motor is subjected to differential amplification through a differential amplification circuit 10, a first waveform signal can be obtained, and the waveform of the first waveform signal can be an ideal sine waveform or a waveform close to a sine wave; after the first waveform signal passes through the hysteresis comparator 20, a second waveform signal having a waveform of an ideal rectangular wave or a waveform close to a rectangular wave is obtained. After the hysteresis comparing circuit 20 generates the second waveform signal, the signal conditioning circuit 30 is used to pre-condition the second waveform signal, and then the output of the second waveform signal is realized, thereby being beneficial to the subsequent circuit to process the second waveform signal. The data processing circuit 40 is configured to receive the second waveform signal, detect a frequency of the second waveform signal, and obtain a rotation speed of the brushless motor by combining a coil number value of the brushless motor. The circuit for detecting the frequency of the second waveform signal may employ a counter of a single chip microcomputer. The display 50 is used for displaying the rotating speed of the brushless motor, and the display intuitiveness is improved.
The utility model provides a brushless motor rotational speed measuring device, through setting up differential amplifier circuit, hysteresis comparison circuit, signal conditioning circuit, data processing circuit and the display that connects in order, realized the automatic measurement of brushless motor rotational speed, had low cost, simple structure, advantage that measuring result is accurate.
According to the utility model provides a brushless motor rotational speed measuring device, data processing circuit 40 includes counter and multiplier, wherein, the counter includes first input interface and first output interface, the multiplier includes second input interface, third input interface and second output interface; the first input interface of the counter is connected with the output of the signal conditioning circuit, and the first output interface of the counter outputs the frequency of the second waveform signal; the input of the second input interface of the multiplier is set to the number of coils of the brushless motor; the third input interface of the multiplier is connected with the first output interface of the counter, and receives the frequency of the second waveform signal; the second output interface of the multiplier outputs the rotating speed of the brushless motor.
The rotation speed of the brushless motor may be expressed as a product of a coil quantity value of the brushless motor and a frequency of the second waveform signal. Data processing circuit 40 may be implemented using counters and multipliers. The counter comprises a first input interface and a first output interface, and the multiplier comprises a second input interface, a third input interface and a second output interface. The first input interface of the counter is connected with the output of the signal conditioning circuit, and the first output interface of the counter outputs the frequency of the second waveform signal. The second input interface of the multiplier may fix the value of the number of coils written dead to the brushless motor. And a third input interface of the multiplier is connected with the first output interface of the counter, and the value is the frequency of the second waveform signal. The second output interface of the multiplier outputs the product of the values of the second input interface and the third input interface, namely the product of the coil quantity value of the brushless motor and the frequency of the second waveform signal. The product of the coil quantity value of the brushless motor and the frequency of the second waveform signal represents the rotating speed of the brushless motor.
The utility model provides a brushless motor rotational speed measuring device acquires brushless motor's rotational speed through utilizing counter and multiplier, has realized the simple and convenient acquirement of brushless motor rotational speed.
According to the utility model provides a pair of brushless motor rotational speed measuring device, first wave form signal is sine wave signal, second wave form signal is the rectangular wave signal.
The first waveform signal is a sine wave signal, and the second waveform signal is a rectangular wave signal. Thereby, the acquisition of the frequency of the second waveform signal by the subsequent counter is facilitated.
According to the utility model provides a brushless motor rotational speed measuring device, through making first waveform signal be sine wave signal, second waveform signal is rectangular wave signal, has facilitated the processing of follow-up signal.
According to the utility model provides a brushless motor speed measuring device, the difference amplifier circuit 10 includes first operational amplifier, first resistance, second resistance, third resistance, fourth resistance, first electric capacity and second electric capacity; wherein: the first end of the first resistor is the first input end, and the first end of the second resistor is the second input end; the second end of the first resistor is connected with the same-direction input end of the first operational amplifier, the first end of the third resistor and the first end of the first capacitor; the second end of the third resistor and the second end of the first capacitor are connected with a power ground; the second end of the second resistor is connected with the inverting input end of the first operational amplifier, the first end of the second capacitor and the first end of the fourth resistor; and the second end of the second capacitor and the second end of the fourth resistor are connected with the output end of the first operational amplifier.
The utility model provides a brushless motor rotational speed measuring device through giving the concrete structure of difference amplifier circuit, has improved the practicality.
According to the utility model provides a pair of brushless motor rotational speed measuring device, hysteresis comparison circuit 20 includes second operational amplifier, fifth resistance, sixth resistance, seventh resistance and eighth resistance, wherein: a first end of the sixth resistor is connected with the output end of the first operational amplifier, and a second end of the sixth resistor is connected with the inverting input end of the second operational amplifier; a first end of the fifth resistor is connected with a power ground, and a second end of the fifth resistor is connected with a non-inverting input end of the second operational amplifier; the first end of the eighth resistor is connected with the second end of the fifth resistor, the second end of the eighth resistor is connected with the second end of the seventh resistor, and the first end of the seventh resistor is connected with the output end of the second operational amplifier.
The utility model provides a brushless motor rotational speed measuring device through giving the concrete structure of hysteresis comparison circuit, has improved the practicality.
According to the utility model provides a pair of brushless motor speed measuring device, signal conditioning circuit 30 includes first diode and ninth resistance, wherein: the anode of the first diode is connected with the second end of the seventh resistor, the cathode of the first diode is connected with the first end of the ninth resistor, and the second end of the ninth resistor is connected with the power ground.
The signal conditioning circuit 30 realizes reliable acquisition of the second waveform signal by arranging the ninth resistor between the output end of the hysteresis comparison circuit 20 and the power ground, and eliminates a negative end part of the output rectangular wave signal through the first diode, thereby being beneficial to detection of the rectangular wave signal by a compatible rear-end interface circuit.
The utility model provides a brushless motor rotational speed measuring device, after negative terminal portion through utilizing first diode to eliminate second waveform signal, recycle the ninth resistance and realize the collection of second waveform signal, facilitated the frequency detection of data processing circuit to second waveform signal and handled.
The utility model provides a brushless motor rotational speed measuring device connects through data processing circuit's input the first end of ninth resistance has realized the reliable input of second waveform signal to data processing circuit.
Fig. 2 is an application schematic diagram of the brushless motor rotation speed measuring device provided by the present invention. As shown in fig. 2, the motor drive circuit generates three-phase power supply signals to the motor. The input signal of the brushless motor rotating speed measuring device is any two-phase signal in three-phase power supply (U phase, V phase and W phase) of the brushless motor, and the U phase and the V phase signals of the motor are connected in the graph 2; the output signal of the brushless motor rotating speed measuring device is a rectangular wave signal, the signal can obtain the frequency of the rectangular wave signal through a counter or a frequency measuring circuit of a single chip microcomputer, and the rotating speed value of the brushless motor can be calculated by combining the number of coils of the brushless motor (the data is generally given by a motor manufacturer).
Fig. 3 is a schematic view of a part of the structure of the device for measuring the rotation speed of the brushless motor according to the present invention. As shown in fig. 3, there are shown a differential amplifying circuit 10 including a first operational amplifier (U1), a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a first capacitor (C1) and a second capacitor (C2), a hysteretic comparison circuit including a second operational amplifier (U2), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7) and an eighth resistor (R8), and a signal conditioning circuit including a first diode (D1) and a ninth resistor (R9), in which:
the brushless motor rotating speed measuring device specifically comprises a differential amplifying circuit, a hysteresis comparison circuit, a signal conditioning circuit, a data processing circuit and a display, and mainly comprises an operational amplifier, a capacitor, a resistor and a diode.
The first input end of the differential amplification circuit is connected with one phase signal of the three-phase power supply of the brushless motor, and the second input end of the differential amplification circuit is connected with the other phase signal of the three-phase power supply of the brushless motor; the first input end of the differential amplification circuit is connected with one end of a resistor R1, and the other end of the resistor R1 is connected with the positive input end (non-inverting input end) of a first operational amplifier U1; the second input end of the differential amplification circuit is connected with one end of a resistor R2, and the other end of the resistor R2 is connected with the negative input end (inverting input end) of the first operational amplifier U1; after the resistor R4 and the capacitor C2 are connected in parallel, one end of the resistor R4 is connected with the negative input end of the first operational amplifier U1, and the other end of the resistor R4 is connected with the output end of the first operational amplifier U1; after the resistor R3 and the capacitor C1 are connected in parallel, one end of the resistor R3 is connected with the positive input end of the first operational amplifier U1, and the other end of the resistor R3 is connected with the power ground after parallel connection; the positive power supply end of the first operational amplifier U1 is connected with a positive power supply, and the negative power supply end is connected with a negative power supply; the output end of the first operational amplifier U1 is connected with one end of a resistor R6, and the other end of the resistor R6 is connected with the negative input end of a second operational amplifier U2; one end of the resistor R5 is connected to the power ground, and the other end is connected to the positive input of the second operational amplifier U2. One end of the resistor R8 is connected with the positive input end of the second operational amplifier U2, the other end of the resistor R3578 is connected with one end of the resistor R7, and the other end of the resistor R7 is connected with the output end of the second operational amplifier U2; the anode of the diode D1 is connected with the resistor R7, the cathode is connected with one end of the resistor R9 and the signal output end, and the other end of the resistor R9 is connected with the power ground; the positive supply terminal of the second operational amplifier U2 is connected to the positive power supply and the negative supply terminal is connected to the negative power supply.
The operating principle of the brushless motor rotating speed measuring device is as follows:
the phase line connected with the coils of the brushless motor can output a series of waveforms in the rotating process of the brushless motor, and the frequency of the waveforms changes along with the change of the rotating speed of the motor; any two-phase signal in the three-phase signals is subjected to differential amplification through an operational amplifier, so that an ideal sine waveform can be obtained; after the obtained sine wave passes through the hysteresis comparator, a relatively ideal rectangular wave can be obtained at the OUTPUT end; the OUTPUT signal of the OUTPUT end can obtain the frequency of the rectangular wave through a counter, and the rotating speed value of the motor can be obtained through calculation by combining the number of coils of the brushless motor.
The utility model discloses a brushless motor rotational speed measuring device does not need extra laser device or hall device, only needs input brushless motor three-phase power supply in arbitrary double-phase signal, can export the rectangular wave signal relevant with the rotational speed, through the frequency that detects the rectangular wave signal, can calculate the actual rotational speed value of motor. The utility model discloses a brushless motor rotational speed measuring device has low cost, simple structure, advantage that measuring result is accurate.
The utility model starts from the drive signal of the brushless motor, obtains the characteristic value of the drive signal by detecting and conditioning the drive signal of the motor, and can calculate the rotating speed of the motor by combining the number of coils of the brushless motor; the scheme starts from the source, measures the rotating speed of the motor, effectively avoids external interference in a use environment, and has accurate measurement result; on the other hand, this utility model circuit adopts discrete analog device to constitute, and the circuit is simple, and the cost is extremely low, can effectively reduce use cost.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (7)
1. A brushless motor rotation speed measuring device, comprising: differential amplifier circuit, hysteresis comparison circuit, signal conditioning circuit, data processing circuit and the display of connecting in order, wherein:
the differential amplification circuit comprises a first input end and a second input end, wherein the first input end is connected with one phase signal in three-phase power supply signals of the brushless motor, and the second input end is connected with the other phase signal in the three-phase power supply signals of the brushless motor; the differential amplifying circuit is used for generating a first waveform signal; the hysteresis comparison circuit is used for receiving the first waveform signal and generating a second waveform signal; the signal conditioning circuit is used for pre-conditioning the second waveform signal; the data processing circuit is used for receiving the second waveform signal and outputting the rotating speed of the brushless motor; the display is used for displaying the rotating speed of the brushless motor.
2. The apparatus according to claim 1, wherein the data processing circuit comprises a counter and a multiplier, wherein the counter comprises a first input interface and a first output interface, and the multiplier comprises a second input interface, a third input interface and a second output interface; the first input interface of the counter is connected with the output of the signal conditioning circuit, and the first output interface of the counter outputs the frequency of the second waveform signal; the input of the second input interface of the multiplier is set to the number of coils of the brushless motor; the third input interface of the multiplier is connected with the first output interface of the counter, and receives the frequency of the second waveform signal; the second output interface of the multiplier outputs the rotating speed of the brushless motor.
3. The apparatus according to claim 1, wherein the first waveform signal is a sine wave signal and the second waveform signal is a rectangular wave signal.
4. The apparatus according to claim 1, wherein the differential amplifier circuit comprises a first operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor and a second capacitor; wherein:
the first end of the first resistor is the first input end, and the first end of the second resistor is the second input end; the second end of the first resistor is connected with the same-direction input end of the first operational amplifier, the first end of the third resistor and the first end of the first capacitor; the second end of the third resistor and the second end of the first capacitor are connected with a power ground; the second end of the second resistor is connected with the inverting input end of the first operational amplifier, the first end of the second capacitor and the first end of the fourth resistor; and the second end of the second capacitor and the second end of the fourth resistor are connected with the output end of the first operational amplifier.
5. The apparatus according to claim 4, wherein the hysteresis comparator circuit comprises a second operational amplifier, a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor, wherein:
a first end of the sixth resistor is connected with the output end of the first operational amplifier, and a second end of the sixth resistor is connected with the inverting input end of the second operational amplifier; a first end of the fifth resistor is connected with a power ground, and a second end of the fifth resistor is connected with a non-inverting input end of the second operational amplifier; the first end of the eighth resistor is connected with the second end of the fifth resistor, the second end of the eighth resistor is connected with the second end of the seventh resistor, and the first end of the seventh resistor is connected with the output end of the second operational amplifier.
6. The apparatus of claim 5, wherein the signal conditioning circuit comprises a first diode and a ninth resistor, wherein: the anode of the first diode is connected with the second end of the seventh resistor, the cathode of the first diode is connected with the first end of the ninth resistor, and the second end of the ninth resistor is connected with the power ground.
7. The apparatus according to claim 6, wherein the input terminal of the data processing circuit is connected to the first terminal of the ninth resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120286519.6U CN214473448U (en) | 2021-02-01 | 2021-02-01 | Brushless motor rotating speed measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120286519.6U CN214473448U (en) | 2021-02-01 | 2021-02-01 | Brushless motor rotating speed measuring device |
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| CN214473448U true CN214473448U (en) | 2021-10-22 |
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| CN202120286519.6U Active CN214473448U (en) | 2021-02-01 | 2021-02-01 | Brushless motor rotating speed measuring device |
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