Laser tachometer and high-speed motor

Abstract

The utility model discloses a laser tachometer and a high-speed motor, the laser tachometer comprises a rotating speed detection circuit, a bias circuit, an amplification circuit, a trigger and a master control circuit, and the rotating speed detection circuit comprises a photosensitive diode. According to the utility model, bias voltage is provided for the photosensitive diode through the bias circuit, so that the response speed of the photosensitive diode is improved; and the main control circuit adjusts the amplification speed of the amplification circuit according to a trigger signal output by the trigger and eliminates noise until an effective signal condition of the main control circuit is met, and then the rotating speed of the rotor is detected according to a reflected light signal subjected to filtering and amplification processing, so that accurate measurement of the rotating speed of the high-speed motor of 0-50000 revolutions is realized.

Description

Technical Field

[0001] This utility model relates to the field of rotational speed measurement technology, and in particular to a laser tachometer and a high-speed motor. Background Technology

[0002] A laser tachometer is an industrial instrument that uses laser technology to achieve non-contact measurement, primarily used for detecting the rotational speed of rotating machinery and the motion speed of linear moving structures. However, as motor speeds increase, existing laser tachometers are limited to measuring motor speeds within the range of 0-6000 rpm, leading to inaccurate measurements and large errors in the results. Utility Model Content

[0003] The main purpose of this invention is to provide a laser tachometer, which aims to solve the problem that existing laser tachometers cannot accurately measure the speed of high-speed motors and have large measurement errors.

[0004] To achieve the above objectives, this utility model proposes a laser tachometer, which includes:

[0005] A rotational speed detection circuit, comprising a photodiode, wherein the rotational speed detection circuit is used to emit a laser source toward the rotor, and the photodiode is used to receive and output corresponding reflected light signals;

[0006] A bias circuit, connected to the photodiode, is used to provide a bias voltage for the photodiode;

[0007] An amplifier circuit is connected to the photodiode, and the amplifier circuit is used to amplify the reflected light signal output by the photodiode before outputting it.

[0008] A trigger, connected to the amplifier circuit, is used to output a corresponding trigger signal according to the reflected light signal;

[0009] The main control circuit has its input terminal connected to the trigger, the main control circuit connected to the speed detection circuit, and the main control circuit connected to the amplifier circuit. The main control circuit is used to adjust the amplification factor of the amplifier circuit according to the trigger signal and to detect the rotational speed of the rotor according to the reflected light signal output by the amplifier circuit.

[0010] In one embodiment, the rotational speed detection circuit includes a laser emitter connected to the main control circuit, the laser emitter being used to emit a laser light source to illuminate the rotor.

[0011] In one embodiment, the laser emitter is a laser.

[0012] In one embodiment, the laser tachometer further includes a power supply circuit connected to the laser emitter, the power supply circuit being used to provide operating power to the laser emitter.

[0013] Furthermore, the power supply circuit includes a voltage regulator and a current-limiting resistor. The voltage regulator is used to regulate the voltage of the input power supply, which is then transmitted to the laser emitter via the current-limiting resistor.

[0014] In one embodiment, the laser tachometer further includes a filtering circuit, the input terminal of which is connected to the photodiode, and the output terminal of which is connected to the amplifier circuit. The filtering circuit is used to filter the reflected light signal output by the photodiode.

[0015] In one embodiment, the laser tachometer further includes:

[0016] An alarm circuit, wherein the controlled terminal of the alarm circuit is connected to the main control circuit, and the alarm circuit is used to output a corresponding alarm signal when working;

[0017] The main control circuit is used to detect the rotational speed of the rotor based on the reflected light signal output by the amplifier circuit, and to control the alarm circuit to work based on the rotational speed of the rotor.

[0018] This utility model also proposes a high-speed motor, which includes a rotor and the aforementioned laser tachometer.

[0019] This utility model provides a bias voltage to the photodiode through a bias circuit to improve the response speed of the photodiode; the main control circuit adjusts the amplification rate of the amplifier circuit according to the trigger signal output by the trigger to eliminate noise until the effective signal conditions of the main control circuit are met, and then detects the rotor speed according to the reflected light signal after filtering and amplification, thereby realizing the accurate measurement of the speed of the high-speed motor from 0 to 50,000 rpm. Attached Figure Description

[0020] Figure 1 This is an overall block diagram of the laser tachometer of this utility model;

[0021] Figure 2 This is a circuit diagram of the laser tachometer of this utility model;

[0022] In the diagram: 10-rotor, 21-laser emitter, 22-photodiode, 23-filter circuit, 24-amplifier circuit, 25-trigger, 26-main control circuit, 27-alarm circuit, 28-bias circuit. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] 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 merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0028] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] As motor speeds increase, existing laser tachometers, which can only measure motor speeds from 0 to 6000 rpm, suffer from inaccurate measurements and large errors in the results.

[0030] To address the aforementioned problems, this invention proposes a laser tachometer. The specific embodiments of this invention will be described in detail below with reference to the accompanying drawings.

[0031] like Figure 1-2 As shown, the laser tachometer includes:

[0032] The rotational speed detection circuit includes a photodiode 22. The rotational speed detection circuit is used to emit a laser light source to the rotor 10, and the photodiode 22 is used to receive and output corresponding reflected light signals.

[0033] Bias circuit 28, which is connected to the photodiode 22, is used to provide a bias voltage for the photodiode 22;

[0034] Amplification circuit 24 is connected to the photodiode 22. The amplification circuit 24 is used to amplify the reflected light signal output by the photodiode 22 and then output it.

[0035] A trigger 25 is connected to the amplifier circuit 24, and the trigger 25 is used to output a corresponding trigger signal according to the reflected light signal;

[0036] The main control circuit 26 is connected to the trigger 25, the main control circuit 26 is connected to the speed detection circuit, and the main control circuit 26 is connected to the amplifier circuit 24. The main control circuit 26 is used to adjust the amplification factor of the amplifier circuit 24 according to the trigger signal, and to detect the speed of the rotor 10 according to the reflected light signal output by the amplifier circuit 24.

[0037] In one embodiment, the rotational speed detection circuit includes a laser emitter 21 connected to the main control circuit 26. The laser emitter 21 is used to emit a laser light source to illuminate the rotor 10.

[0038] In one embodiment, the laser emitter 21 is a laser.

[0039] In one embodiment, the laser tachometer further includes a power supply circuit connected to the laser emitter 21, the power supply circuit being used to provide operating power to the laser emitter 21.

[0040] Furthermore, the power supply circuit includes a voltage regulator and a current-limiting resistor. The voltage regulator is used to regulate the voltage of the input power supply, which is then transmitted to the laser emitter 21 via the current-limiting resistor.

[0041] In one embodiment, the laser tachometer further includes a filter circuit 23, the input terminal of which is connected to the photodiode 22, and the output terminal of which is connected to the amplifier circuit 24. The filter circuit 23 is used to filter the reflected light signal output by the photodiode 22.

[0042] In one embodiment, the laser tachometer further includes:

[0043] An alarm circuit 27 is provided, the controlled terminal of which is connected to the main control circuit 26. The alarm circuit 27 is used to output a corresponding alarm signal during operation.

[0044] The main control circuit 26 is used to detect the rotational speed of the rotor 10 based on the reflected light signal output by the amplifier circuit 24, and to control the alarm circuit 27 to work based on the rotational speed of the rotor 10.

[0045] In this embodiment, the rotational speed detection circuit can be implemented using any rotational speed detection circuit capable of detecting the rotor speed 10, such as a laser emitter 21 and a photodiode 22; the laser emitter 21 can be implemented using any laser emitter 21 capable of emitting laser light, such as a laser. In this embodiment, the laser is provided with operating power through a power supply circuit, that is, the input power supply voltage is regulated to 3.3V by a voltage regulator, and then flows through a 100Ω current-limiting resistor to power the laser, so as to ensure that the laser can be powered on and operated normally.

[0046] In this embodiment, the trigger 25 can be implemented using a Schmitt trigger 25, and the main control circuit 26 can be implemented using an MCU, DSP (Digital Signal Processor), FPGA (Field Programmable Gate Array), SOC (System On Chip), etc. As can be understood, the laser emitter 21 emits a laser light source to illuminate the rotor 10, and the laser light source is reflected by the reflective strip to illuminate the photodiode 22; the photodiode 22 receives the reflected light and converts the light signal into a voltage signal to output the reflected light signal; the reflected light signal is filtered and amplified by the filter circuit 23 and the amplifier circuit 24 and then sent to the trigger 25; the trigger 25 determines whether the level of the reflected light signal reaches the level threshold. When the level of the reflected light signal exceeds the level threshold, a high-level trigger signal is output to the main control circuit 26; the main control circuit 26 captures the interval and pulse width of the trigger signal to determine whether it is a usable signal or an interference signal, and then adjusts the tap position of the digital potentiometer to adjust the amplification factor of the amplifier circuit 24 until the signal meets the effective signal condition of the main control circuit 26; the main control circuit 26 obtains the rotational speed of the rotor 10 based on the received effective reflected light signal; it should be noted that the main control circuit 26 has a preset mapping table of reflected light intensity ratio-rotational speed conversion coefficient, that is, each reflected light intensity ratio corresponds to a rotational speed conversion coefficient. In addition, in this embodiment, the bias voltage of the photodiode 22 is increased by the bias circuit 28 to increase the response speed of the photodiode 22. Furthermore, the amplification factor of the amplifier circuit 24 is controlled by the main control circuit 26 to sample the noise signal in order to eliminate noise interference, thereby improving the response frequency of the laser tachometer to accurately measure the high-speed motor from 0 to 50,000 rpm.

[0047] In this embodiment, the alarm circuit 27 can be implemented using any alarm circuit 27 capable of outputting a corresponding alarm signal, such as a flashing light or a buzzer. Specifically, when the main control circuit 26 detects that the rotation speed is not within the preset rotation speed range, it controls the alarm circuit 27 to work and output an alarm signal to remind the staff that the high-speed motor speed is abnormal and that corresponding measures should be taken in time to improve safety.

[0048] This utility model laser tachometer provides a bias voltage to the photodiode 22 through the bias circuit 28 to improve the response speed of the photodiode 22; the main control circuit 26 adjusts the amplification rate of the amplifier circuit 24 according to the trigger signal output by the trigger 25 to eliminate noise until the effective signal conditions of the main control circuit 26 are met, and then detects the rotation speed of the rotor 10 according to the reflected light signal after filtering and amplification, thereby realizing the accurate measurement of the high-speed motor speed from 0 to 50,000 rpm.

[0049] This utility model also proposes a high-speed motor, which includes a rotor 10 and the aforementioned laser tachometer; the specific structure of the laser tachometer is as described in the above embodiments. Since this high-speed motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.

[0050] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A laser tachometer, characterized by, The laser tachometer is used to measure high-speed motors, which include rotors. A rotational speed detection circuit, comprising a photodiode, wherein the rotational speed detection circuit is used to emit a laser source toward the rotor, and the photodiode is used to receive and output corresponding reflected light signals; A bias circuit, connected to the photodiode, is used to provide a bias voltage for the photodiode; An amplifier circuit is connected to the photodiode, and the amplifier circuit is used to amplify the reflected light signal output by the photodiode before outputting it. A trigger, connected to the amplifier circuit, is used to output a corresponding trigger signal according to the reflected light signal; The main control circuit has its input terminal connected to the trigger, the main control circuit connected to the speed detection circuit, and the main control circuit connected to the amplifier circuit. The main control circuit is used to adjust the amplification factor of the amplifier circuit according to the trigger signal and to detect the speed of the rotor according to the reflected light signal output by the amplifier circuit.

2. The laser tachometer of claim 1, wherein, The rotational speed detection circuit includes a laser emitter, which is connected to the main control circuit. The laser emitter is used to emit a laser light source to illuminate the rotor.

3. The laser tachometer of claim 2, wherein, The laser emitter is a laser.

4. The laser tachometer of claim 3, wherein, The laser tachometer also includes a power supply circuit, which is connected to the laser and is used to provide operating power to the laser.

5. The laser tachometer of claim 4, wherein, The power supply circuit includes a voltage regulator and a current-limiting resistor. The voltage regulator is used to regulate the voltage of the input power supply, which is then transmitted to the laser via the current-limiting resistor.

6. The laser tachometer of claim 1, wherein, The laser tachometer also includes a filtering circuit. The input terminal of the filtering circuit is connected to the photodiode, and the output terminal of the filtering circuit is connected to the amplifier circuit. The filtering circuit is used to filter the reflected light signal output by the photodiode.

7. The laser tachometer of claim 1, wherein The laser tachometer also includes: An alarm circuit, wherein the controlled terminal of the alarm circuit is connected to the main control circuit, and the alarm circuit is used to output a corresponding alarm signal when working; The main control circuit is used to detect the rotational speed of the rotor based on the reflected light signal output by the amplifier circuit, and to control the alarm circuit to work based on the rotational speed of the rotor.

8. A high speed electric machine characterized by, The high-speed motor includes a rotor and a laser tachometer as described in any one of claims 1-7.

Images