Motor rotating speed monitoring and control circuit

Abstract

The utility model discloses a motor rotating speed monitoring and control circuit, which relates to the field of motors, and comprises a motor working module used for connecting alternating current to a motor and receiving a control signal of a working control module to control the working state of the motor; the working control module is used for receiving a signal of the microcontroller and outputting a control signal to the motor working module through an optocoupler; compared with the prior art, the beneficial effects of the utility model are that the primary side of the current transformer is connected in series with one end of the motor by using the coupling principle of the coil to voltage and current, the secondary side of the current transformer collects coupling current signals, and the larger the current is, the stronger the coupling signals are, namely the larger the ADC collection value is. The faster the rotating speed of the motor is, the faster the polarity conversion of the coupling current is, and the higher the signal frequency collected by the microcontroller is, thereby reducing the interference influence of the environmental magnetic field on the detection sensor, and reducing the workload of the whole machine assembly personnel.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor field, concretely is a kind of motor rotating speed monitoring and control circuit. BACKGROUND

[0002] With the development of electronic technology, the improvement of people's living standards, the requirement of electronic product equipment is higher, in traditional motor rotating speed control and rotating speed monitoring strategy, generally using hall sensor device carries out magnetic field detection, carries out monitoring and control to motor rotating speed by inductive magnetic field conversion, but for the environment that magnetic field is more complex, the precision and accuracy of monitoring have certain influence, need improvement. UTILITY MODEL CONTENTS

[0003] The utility model is to provide a kind of motor rotating speed monitoring and control circuit, to solve the problem raised in the above background technology.

[0004] To achieve the above object, the utility model provides the following technical scheme:

[0005] A kind of motor rotating speed monitoring and control circuit, comprising:

[0006] Motor operating module is used to motor access alternating current, receives the control signal of work control module, to control motor operating state;

[0007] Work control module is used to receive the signal of microcontroller, passes through opto-coupler to output control signal to motor operating module;

[0008] Signal acquisition module is used to gather motor current, converts into voltage signal output to amplification output module;

[0009] Amplification output module is used to output to microcontroller after input voltage signal amplification;

[0010] Motor operating module connects signal acquisition module, signal acquisition module connects amplification output module, work control module connects motor operating module.

[0011] As a further scheme of the utility model: motor working module includes motor, current transformer T135, bidirectional thyristor TR6, one end of motor is connected live wire, the other end of motor is connected the second end of current transformer T135, the third end of current transformer T135 is connected signal acquisition module, the fourth end of current transformer T135 is grounded, the first end of current transformer T135 is connected one end of capacitor C38, one end of capacitor C36, the first end of bidirectional thyristor TR6, the other end of capacitor C38 is connected one end of resistance R106, one end of resistance R107, the other end of resistance R106 is connected the other end of resistance R107, one end of resistance R105, the second end of bidirectional thyristor TR6, zero line, the other end of resistance R105 is connected the other end of capacitor C36, the third end of bidirectional thyristor TR6 is connected working control module.

[0012] As a further scheme of the utility model: working control module includes photoelectric coupler U9, one end of resistance R112 is connected to the input end of photoelectric coupler U9, the other end of resistance R112 is connected to 5V voltage, the signal MOTOR DRIVER outputted by the first GPIO port of microcontroller is introduced to the other end of the input end of photoelectric coupler U9, one end of resistance R111 is connected to the output end of photoelectric coupler U9, the other end of resistance R111 is connected to the other end of resistance R105, the other end of the output end of photoelectric coupler U9 is connected to the third end of bidirectional thyristor TR6.

[0013] As a further scheme of the utility model: signal acquisition module includes diode D11, resistance R128, capacitor C57, the positive electrode of diode D11 is connected to motor working module, one end of resistance R128, one end of capacitor C57, amplification output module are connected to the negative electrode of diode D11, the other end of resistance R128 is grounded, the other end of capacitor C57 is grounded.

[0014] As a further scheme of the utility model: amplification output module includes amplifier U4, one end of resistance R133, one end of resistance R134 is connected to the inverting terminal of amplifier U4, the other end of resistance R133 is grounded, the other end of resistance R134 is connected to the output end of amplifier U4, one end of resistance R127, the signal MOTOR CURRENT is outputted to the second GPIO port of microcontroller by the other end of resistance R127, one end of resistance R131, one end of resistance R12 is connected to the noninverting terminal of amplifier U4, the other end of resistance R131 is connected to signal acquisition module, the other end of resistance R12 is grounded.

[0015] Compared with the prior art, the utility model discloses the beneficial effects are: the utility model discloses the coupling principle of coil to voltage current, the primary series connection motor one end of current transformer, the coupling current signal collection of current transformer secondary, and the coupling signal is stronger with the greater current, that is, the greater the ADC collection value, the faster motor speed coupling current polarity transforms, and the higher signal frequency of microcontroller collection, reduce the interference influence of environmental magnetic field to detection sensor, reduce the work load of whole machine assembly personnel simultaneously. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a kind of circuit diagram of motor speed monitoring and control circuit.

[0017] Figure 2 It is the waveform diagram of signal MOTOR CURRENT.

[0018] Figure 3 It is the waveform diagram of signal MOTOR DRIVER. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0020] Please refer to Figure 1 A kind of motor speed monitoring and control circuit, comprising:

[0021] Motor working module is used to motor access alternating current, receives the control signal of working control module, to control motor working state;

[0022] Working control module is used to receive the signal of microcontroller, passes through opto-coupler to output control signal to motor working module;

[0023] Signal acquisition module is used to gather the current of motor, converts voltage signal output to amplification output module;

[0024] Amplification output module is used to amplify input voltage signal and output to microcontroller;

[0025] Motor working module connects signal acquisition module, signal acquisition module connects amplification output module, and working control module connects motor working module.

[0026] In the embodiment: please refer to Figure 1The motor working module includes a motor, a current transformer T135, and a bidirectional thyristor TR6. One end of the motor is connected to the live wire, the other end of the motor is connected to the second end of the current transformer T135, the third end of the current transformer T135 is connected to the signal acquisition module, the fourth end of the current transformer T135 is grounded, the first end of the current transformer T135 is connected to one end of the capacitor C38, one end of the capacitor C36, and the first end of the bidirectional thyristor TR6, the other end of the capacitor C38 is connected to one end of the resistor R106 and one end of the resistor R107, the other end of the resistor R106 is connected to the other end of the resistor R107, one end of the resistor R105, the second end of the bidirectional thyristor TR6, and the neutral wire, the other end of the resistor R105 is connected to the other end of the capacitor C36, and the third end of the bidirectional thyristor TR6 is connected to the working control module.

[0027] When triac TR6 conducts, the live wire, motor, current transformer T135, triac TR6, and neutral wire form a circuit. The current flowing through the motor is the current flowing through current transformer T135, which is fed back to the signal acquisition module through current transformer T135. The faster the triac TR6 conducts, the faster the motor speed, and the faster the polarity of the coupled current through current transformer T135 changes.

[0028] In this example: See Figure 1 and Figure 3 The working control module includes an optocoupler U9, one end of the input end of the optocoupler U9 is connected to one end of the resistor R112, the other end of the resistor R112 is connected to a 5V voltage, the other end of the input end of the optocoupler U9 introduces the signal MOTOR DRIVER output by the first GPIO port of the microcontroller, one end of the output end of the optocoupler U9 is connected to one end of the resistor R111, the other end of the resistor R111 is connected to the other end of the resistor R105, and the other end of the output end of the optocoupler U9 is connected to the third end of the bidirectional thyristor TR6.

[0029] The GPIO port of the microcontroller outputs the signal MOTOR DRIVER (for example Figure 3 As shown, it can be seen from the curve that the motor speed can be set humanely according to actual needs. The larger the duty cycle, the higher the motor speed, and the larger the duty cycle of the collected waveform). By controlling whether the light-emitting diode inside the optocoupler U9 is turned on or not, the output of the output end of the optocoupler U9 is controlled to control the conduction frequency of the bidirectional thyristor TR6.

[0030] In this example: See Figure 1 The signal acquisition module includes a diode D11, a resistor R128, and a capacitor C57. The positive electrode of the diode D11 is connected to the motor working module, the negative electrode of the diode D11 is connected to one end of the resistor R128, one end of the capacitor C57, and the amplification output module, the other end of the resistor R128 is grounded, and the other end of the capacitor C57 is grounded.

[0031] The third end of the current transformer T135 outputs a current signal, which is rectified by a diode D11, filtered by a capacitor C57, and a normal voltage signal is output on a resistor R128 to an amplification output module.

[0032] In the embodiment, referring to Figure 1 and Figure 2 , the amplification output module comprises an amplifier U4, an inverting terminal of the amplifier U4 is connected with one end of a resistor R133 and one end of a resistor R134, the other end of the resistor R133 is grounded, the other end of the resistor R134 is connected with an output terminal of the amplifier U4 and one end of a resistor R127, the other end of the resistor R127 outputs a signal MOTOR CURRENT to a second GPIO port of a microcontroller, a non-inverting terminal of the amplifier U4 is connected with one end of a resistor R131 and one end of a resistor R12, the other end of the resistor R131 is connected with the signal acquisition module, and the other end of the resistor R12 is grounded.

[0033] The input voltage signal is amplified by the amplifier U4 and output to the microcontroller as a signal MOTOR CURRENT (for example Figure 2 , a preset driving signal is output through a MOTOR DRIVER end to drive the motor to rotate, a MOTOR CURRENT end monitors a waveform of motor current feedback, the microcontroller acquires the signal at the MOTOR CURRENT end, a total of 6 times, and then performs averaging to complete a stable sampling value), the microcontroller is a common device, input and output signals are common technologies, and no method innovation is involved, and positions such as T160, T162, T164, T170, T172 and T180 in the figure can be connected with an ADC function port of the microcontroller to determine the running state of the circuit.

[0034] The working principle of the utility model is that: the motor working module is used for connecting the motor to an alternating current, receiving a control signal of the working control module to control the working state of the motor; the working control module is used for receiving a signal of the microcontroller, outputting a control signal to the motor working module through an optical coupler; the signal acquisition module is used for acquiring a current flowing through the motor and converting the current into a voltage signal output to the amplification output module; and the amplification output module is used for amplifying an input voltage signal and outputting the amplified signal to the microcontroller.

[0035] For those skilled in the art, it is obvious that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting.

[0036] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature or implementation described herein. The specification can include implicit combinations of explicitly mentioned features and / or implicit combinations of implicitly mentioned features. Such combinations are also expressly included within the scope of the specification and an embodiment.

Claims

1. A motor speed monitoring and control circuit, characterized in that: The motor speed monitoring and control circuit includes: The motor working module is used to connect the motor to AC power and receive control signals from the working control module to control the working state of the motor; The working control module is used to receive the signal from the microcontroller and output the control signal to the motor working module through the optical coupler; The signal acquisition module is used to collect the current flowing through the motor, convert it into a voltage signal and output it to the amplification output module; Amplification output module, used to amplify the input voltage signal and output it to the microcontroller; The motor working module is connected to the signal acquisition module, the signal acquisition module is connected to the amplification output module, and the working control module is connected to the motor working module.

2. The motor speed monitoring and control circuit according to claim 1, characterized in that: The motor working module includes a motor, a current transformer T135, and a bidirectional thyristor TR6. One end of the motor is connected to the live wire, the other end of the motor is connected to the second end of the current transformer T135, the third end of the current transformer T135 is connected to the signal acquisition module, the fourth end of the current transformer T135 is grounded, the first end of the current transformer T135 is connected to one end of the capacitor C38, one end of the capacitor C36, and the first end of the bidirectional thyristor TR6, the other end of the capacitor C38 is connected to one end of the resistor R106 and one end of the resistor R107, the other end of the resistor R106 is connected to the other end of the resistor R107, one end of the resistor R105, the second end of the bidirectional thyristor TR6, and the neutral wire, the other end of the resistor R105 is connected to the other end of the capacitor C36, and the third end of the bidirectional thyristor TR6 is connected to the working control module.

3. The motor speed monitoring and control circuit according to claim 2, characterized in that: The working control module includes an optocoupler U9, one end of the input end of the optocoupler U9 is connected to one end of the resistor R112, the other end of the resistor R112 is connected to a 5V voltage, the other end of the input end of the optocoupler U9 introduces the signal MOTOR DRIVER output by the first GPIO port of the microcontroller, one end of the output end of the optocoupler U9 is connected to one end of the resistor R111, the other end of the resistor R111 is connected to the other end of the resistor R105, and the other end of the output end of the optocoupler U9 is connected to the third end of the bidirectional thyristor TR6.

4. The motor speed monitoring and control circuit according to claim 1, characterized in that: The signal acquisition module includes a diode D11, a resistor R128, and a capacitor C57. The positive pole of the diode D11 is connected to the motor working module, the negative pole of the diode D11 is connected to one end of the resistor R128, one end of the capacitor C57, and the amplification output module, the other end of the resistor R128 is grounded, and the other end of the capacitor C57 is grounded.

5. The motor speed monitoring and control circuit according to claim 1, characterized in that: The amplification output module includes an amplifier U4, the inverting end of the amplifier U4 is connected to one end of the resistor R133 and one end of the resistor R134, the other end of the resistor R133 is grounded, the other end of the resistor R134 is connected to the output end of the amplifier U4 and one end of the resistor R127, the other end of the resistor R127 outputs the signal MOTOR CURRENT to the second GPIO port of the microcontroller, the non-inverting end of the amplifier U4 is connected to one end of the resistor R131 and one end of the resistor R12, the other end of the resistor R131 is connected to the signal acquisition module, and the other end of the resistor R12 is grounded.

Images