CN218678878U - Circuit for detecting rotating speed of direct current motor - Google Patents
Circuit for detecting rotating speed of direct current motor Download PDFInfo
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- CN218678878U CN218678878U CN202222579125.7U CN202222579125U CN218678878U CN 218678878 U CN218678878 U CN 218678878U CN 202222579125 U CN202222579125 U CN 202222579125U CN 218678878 U CN218678878 U CN 218678878U
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Abstract
The utility model discloses a detect direct current motor rotational speed circuit for detect direct current motor is just, the rotational speed of reversal, including MCU circuit, motor rotation circuit, rotational speed detection circuit, pilot lamp, power supply circuit, direct current motor and magnetic ring, wherein MCU circuit and motor rotation circuit, rotational speed detection circuit, pilot lamp electric connection, power supply circuit provides the direct current for MCU circuit, motor rotation circuit, rotational speed detection circuit respectively, the rotational speed detection circuit is fixed on the direct current motor shell, the magnetic ring is fixed in the direct current motor pivot outside the rotational speed detection circuit; the motor rotation circuit is provided with three triodes and relays, wherein the first triode and the relay control the power supply of the direct current motor, and the second triode and the third triode and the relay control the forward rotation and the reverse rotation of the direct current motor; the rotating speed detection circuit is provided with a Hall sensor, outputs pulse signals by sensing the magnetic poles of the magnetic rings and feeds the pulse signals back to the MCU to calculate the rotating speed, and the rotating speed is qualified to light a green light, unqualified to light a red light and light a green light during detection.
Description
Technical Field
The utility model relates to a direct current motor detection area especially relates to a detect direct current motor rotational speed circuit.
Background
At present, the rotating speed of a direct current motor is mostly tested, the normal rotating speed is basically tested, but the reverse rotating speed of the motor is very important in many times, and if the direct current motor meets the requirements only for positive and negative rotating speed parameters, such as a sweeping robot, a child trolley and the like, the direct current motor can be normally used, and a scheme capable of testing the rotating speed of positive rotation and reverse rotation is needed.
Disclosure of Invention
The utility model provides a detect direct current motor speed circuit realizes through triode and relay whether MCU control gives the direct current motor power supply, and simultaneous control direct current motor corotation and reversal are changed by hall sensor response magnetism again, and output pulse signal calculates the direct current motor rotational speed for MCU.
The utility model provides a detect direct current motor rotational speed circuit for detect direct current motor is just, the rotational speed of reversal, including MCU circuit, motor rotation circuit, rotational speed detection circuit, pilot lamp, power supply circuit, direct current motor and magnetic ring, MCU circuit and motor rotation circuit, rotational speed detection circuit, pilot lamp electric connection, power supply circuit provides the direct current for MCU circuit, motor rotation circuit, rotational speed detection circuit respectively, the rotational speed detection circuit is fixed on the direct current motor shell, the magnetic ring is fixed in the direct current motor pivot outside the rotational speed detection circuit;
the motor rotating circuit is provided with a motor power supply control circuit and a motor forward/backward rotation circuit and is realized by three triodes and relays, wherein the first triode and the relay are the motor power supply control circuit and control whether to supply power to the direct current motor, and the second triode and the third triode and the relay are the motor forward/backward rotation circuits and control the direct current motor to rotate forward and backward; the rotating speed detection circuit is provided with a Hall sensor, outputs pulse signals by sensing the magnetic poles of the magnetic rings and feeds the pulse signals back to the MCU to calculate the rotating speed, and the rotating speed is qualified to light a green light, unqualified to light a red light and light a green light during detection.
Preferably, the MCU circuit is powered by a 3.3V direct current power supply provided by a power circuit, and is provided with a clock circuit, a reset circuit and a filter capacitor.
Preferably, the input signal end of the motor power supply control circuit is connected with a pin JK _ CT of the MCU circuit, the pin JK _ CT of the MCU circuit is connected with one end of a resistor R1 of the motor rotating circuit, the other end of the resistor R1 is connected with a base of a triode Q1, an emitting electrode of the triode Q1 is grounded, a collecting electrode is connected with an anode of a diode D1 and a pin of a coil 1 of a relay K1, a cathode of the diode D1 is connected with a direct-current power supply 5V and a pin 2 of the coil of the relay K1, a public end of the relay K1 is connected with an input anode IN + of the motor power supply, and a normally open contact of the relay K1 is connected with a normally closed contact of the relay K2 and a normally open contact of the relay K3.
Preferably, the motor forward/reverse circuit is provided with two triodes and a relay circuit to complete the switching of the positive and reverse poles of the motor, the input signal end of the motor forward/reverse circuit is connected with a pin JK _ CD of the MCU circuit, the pin JK _ CD of the MCU circuit is connected with one end of a resistor R3 IN the motor forward/reverse circuit, the other end of the resistor R3 is connected with a base of a triode Q2, an emitting electrode of the triode Q2 is grounded, a collecting electrode of the triode Q2 is connected with an anode of a diode D2 and a coil 1 pin of a relay K2, a cathode of the diode D2 is connected with a direct current power supply 5V and a coil 2 pin of the relay K2, a normally open contact of the relay K2 is connected with a negative input electrode IN of the motor, and a public end of the relay K2 is connected with the positive electrode of the direct current motor.
Preferably, the input signal end of the motor forward/reverse circuit is connected with a pin JK _ CD of the MCU circuit, the pin JK _ CD of the MCU circuit is connected with one end of a resistor R5 of the other path IN the motor forward/reverse circuit, the other end of the resistor R5 is connected with a base electrode of a triode Q3, an emitting electrode of the triode Q3 is grounded, a collector electrode of the triode Q3 is connected with an anode of a diode D3 and a coil 1 pin of a relay K3, a cathode of the diode D3 is connected with a direct-current power supply 5V and a coil 2 pin of the relay K3, a normally closed contact of the relay K3 is connected with a power input negative electrode IN of the motor, and a public end of the relay K3 is connected with a negative electrode of the direct-current motor.
Preferably, the input signal end of the rotating speed detection circuit is connected with a pin H _ MCU of the MCU circuit, the pin H _ MCU of the MCU circuit is connected with a filter capacitor C8 and a resistor R7 of the rotating speed detection circuit, the other end of the filter capacitor C8 is grounded, the other end of the resistor R7 is connected with an upper pull resistor R8 and an output end of a Hall sensor U2, the upper pull resistor R8 is connected with a power supply input end of the Hall sensor U2, and the power supply input end of the Hall sensor U2 inputs 5V of voltage.
Preferably, when the direct current motor rotates, the magnetic ring is driven to rotate, when the hall sensor senses the S pole or the N pole of the magnetic pole, different flat signals are output as square wave pulse signals, and the output square wave pulse signals are fed back to the MCU to calculate the rotating speed of the motor. A pair of N poles and S poles are one magnetic pole number, and the more the magnetic poles of the magnetic ring are, the higher the precision of the tested rotating speed is.
Preferably, the indicating lamp is provided with a red lamp circuit, a green lamp circuit and a blue lamp circuit, the input end of the red lamp circuit is connected with a pin LED _ R of the MCU circuit, the pin LED _ R of the MCU circuit is connected with a current-limiting resistor R20, the current-limiting resistor R20 is connected with the anode of a red LED D5, the cathode of the red LED D5 is grounded, and the green lamp circuit and the blue lamp circuit are designed in the same way.
Preferably, the power supply circuit is designed with output voltages of 3.3V, 5V and a motor input voltage IN + \ IN-, respectively.
Preferably, a filter circuit is designed between the positive electrode and the negative electrode of the direct current motor, the filter circuit comprises a relay K2, the common end of the relay K2 is connected with a filter magnetic bead B1, and the filter magnetic bead B1 is connected with a filter capacitor C5 and a filter capacitor C3; the filter circuit comprises a relay K3, a common end of which is connected with a filter magnetic bead B2, and the filter magnetic bead B2 is connected with a filter capacitor C6 and a filter capacitor C4; the other ends of the filter capacitor C5 and the filter capacitor C6 are connected with the motor shell.
Preferably, the coils of the relay K1, the relay K2 and the relay K3 are respectively provided with reverse discharge diodes D1, D2 and D3.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
1. the application designs a detect direct current motor rotational speed circuit, and motor power supply control circuit and motor just/reversal circuit realize low-voltage control direct current motor power supply, safe and reliable through triode and relay.
2. The application designs a detect direct current motor rotational speed circuit, positive negative pole of motor/reversal circuit can automatic switch-over direct current motor, realizes that direct current motor makes direct current motor reversal by the good back of corotation test, automatic switch-over positive negative pole, tests, and is high-efficient swift.
3. The application designs a detect direct current motor rotational speed circuit, feeds back pulse signal through hall sensor and calculates slew velocity, can design magnetic ring magnetic pole quantity according to the precision of automatic speed, guarantees the detection precision through changing the magnetic ring.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram of a circuit for detecting the rotation speed of a dc motor according to the present invention;
FIG. 2 is a schematic diagram of the MCU circuit of the present invention;
FIG. 3 is a schematic diagram of a motor rotation circuit according to the present invention;
FIG. 4 is a schematic diagram of a rotation speed detection circuit of the present invention;
FIG. 5 is a schematic diagram of the circuit of the indicator light of the present invention;
FIG. 6 is a schematic diagram of the key circuit of the present invention;
fig. 7 is a magnetic ring of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
As shown in fig. 1 to 6, the circuit for detecting the rotation speed of the dc motor provided by the present application includes an MCU circuit, a motor rotation circuit, a rotation speed detection circuit, an indicator light, a power circuit, a dc motor and a magnetic ring, wherein the power circuit respectively provides dc power to the MCU circuit, the motor rotation circuit and the rotation speed detection circuit, and the MCU circuit is electrically connected to the motor rotation circuit, the rotation speed detection circuit and the indicator light; the rotating speed detection circuit is fixed on the direct current motor shell, and the magnetic ring is fixed on a direct current motor rotating shaft outside the rotating speed detection circuit;
specifically, the motor rotation circuit is provided with a motor power supply control circuit and a motor forward/backward rotation circuit, and is realized by three triodes and relays, wherein the first triode and the relay are the motor power supply control circuit and control whether to supply power to the direct current motor, and the second triode and the third triode and the relay are the motor forward/backward rotation circuits and control the forward rotation and the backward rotation of the direct current motor; the rotating speed detection circuit is provided with a Hall sensor, outputs pulse signals by sensing the magnetic poles of the magnetic rings and feeds the pulse signals back to the MCU to calculate the rotating speed, and the rotating speed is qualified to light a green light, unqualified to light a red light and light a green light during detection.
In an optional embodiment, the MCU circuit uses a high-performance ARM CortexTM-M0 as a 32-bit microcontroller with an inner core, the model MM32L0773PF is designed with a clock circuit, a reset circuit and a filter capacitor.
Illustratively, the MCU clock circuit design is formed by an 8MHz passive crystal oscillator T1 and two impedance matching capacitors C26 and C27, wherein the 8MHz passive crystal oscillator T1 is connected with an MM32L0773PF pin OSC _ IN and OSC _ OUT and the impedance matching capacitors C26 and C27, and the other ends of the impedance matching capacitors C26 and C27 are grounded.
Illustratively, the MCU reset circuit is designed, the external reset of the NRST pin is realized, a direct current power supply 3.3V is connected with one end of a current limiting resistor R15, the other end of the current limiting resistor R15 is connected with the MCU pin NRST and an integrating capacitor C28, and the integrating capacitor C28 is grounded.
Illustratively, the MCU pin PB5 is a control pin of a motor power supply control circuit, and when the MCU pin PB5 is at a high level, power is supplied to the motor, and when the MCU pin PB5 is at a low level, power supply is stopped; the MCU pin PB4 is a control pin of a forward and reverse rotation circuit of the motor, when the MCU pin PB4 is at a low level, the motor rotates forward, and when the MCU pin PB4 is at a high level, the motor rotates reversely; MCU pin PB14, PB13, PB12 are the pilot lamp control foot, control blue light, green light and red word respectively, and when the pilot lamp control foot high level, the pilot lamp that corresponds is lighted.
In an optional embodiment, the motor power supply control circuit is designed with a filter capacitor C1, a current limiting resistor R1, a pull-down resistor R2, a triode Q1, a reverse discharge protection diode D1 and a relay K1.
Exemplarily, a signal input end of a motor power supply control circuit is connected with a pin PB5 of the MCU circuit, the pin PB5 is connected with a filter capacitor C1, a connector between pages of the pin PB5 is JK _ CT, the JK _ CT is connected with one end of a current limiting resistor R1 of the motor rotation circuit, the other end of the current limiting resistor R1 is connected with a base of a triode Q1 and a pull-down resistor R2, the other end of the pull-down resistor R2 is grounded, an emitting electrode of the triode Q1 is grounded, a collector of the triode Q1 is connected with an anode of a reverse discharge protection diode D1 and a coil 1 pin of a relay K1, a cathode of the reverse discharge protection diode D1 is connected with a direct current power supply 5V and a coil 2 pin of the relay K1, a common end of the relay K1 is connected with a motor power supply input anode IN +, a normally open contact of the relay K1 is connected with a normally closed contact of the relay K2, and a normally open contact of the relay K3.
In an optional implementation manner, two triodes and a relay circuit are designed in the motor forward/reverse circuit to complete the switching of the positive and negative electrodes of the motor, the motor forward/reverse circuit is designed with a current-limiting resistor R3, a pull-down resistor R4, a triode Q2, a reverse discharge protection diode D2 and a relay K2, a filter magnetic bead B1, a filter capacitor C3, a filter capacitor C5 and a current-limiting resistor R5, a pull-down resistor R6, a triode Q3, a reverse discharge protection diode D3 and a relay K3, a filter magnetic bead B2, a filter capacitor C4, a filter capacitor C6 and a direct current motor.
Illustratively, the input signal end of the motor forward/reverse circuit is connected with a pin PB4 of the MCU circuit, the pin PB4 is connected with a filter capacitor C2, the connector between the pins PB4 is JK _ CD, JK _ CD is connected with one end of a current limiting resistor R3 IN the motor forward/reverse circuit, the other end of the current limiting resistor R3 is connected with a base electrode of a triode Q2 and a pull-down resistor R4, the other end of the pull-down resistor R4 is grounded, an emitting electrode of the triode Q2 is grounded, a collector electrode of the triode Q2 is connected with an anode of a reverse discharge protection diode D2 and a coil 1 pin of a relay K2, a cathode of the reverse discharge protection diode D2 is connected with a DC power supply 5V and a coil 2 pin of the relay K2, a normally open contact of the relay K2 is connected with the input cathode IN of the motor power supply, and a common end of the relay K2 is connected with the anode of the DC motor.
Illustratively, one end of a current limiting resistor R5 of the other path of the JK _ CD connecting motor forward/reverse circuit is connected, the other end of the current limiting resistor R5 is connected with a base electrode of a triode Q3 and a pull-down resistor R6, the other end of the pull-down resistor R6 is grounded, an emitting electrode of the triode Q3 is grounded, a collector electrode of the triode Q3 is connected with an anode of a reverse discharge protection diode D3 and a coil 1 pin of a relay K3, a cathode of the reverse discharge protection diode D3 is connected with a direct current power supply 5V and a coil 2 pin of the relay K3, a normally closed contact of the relay K3 is connected with a motor power supply input negative electrode IN-, and a common end of the relay K3 is connected with a negative electrode of the direct current motor.
IN an optional implementation mode, a pin PB5 of the MCU circuit outputs a high level to power on a base of a transistor Q1, the base and an emitter of the transistor Q1 are turned on to turn on a collector and an emitter of the transistor Q1, a coil of a relay K1 is energized, a normally open contact of the relay K1 is closed, the normally open contact of the relay K1 is connected to a public end, and a motor power supply IN +, IN-supplies power to the motor, specifically having the following two conditions:
IN the first situation, the MCU pin PB4 outputs a low level, a motor power supply IN + is connected to a normally closed contact of a relay K2 through a normally open contact of the relay K1, the normally closed contact of the relay K2 is connected with a filtering magnetic bead B1, the other end of the filtering magnetic bead B1 is connected with the positive electrode of a motor, the negative electrode of the motor is connected with a filtering magnetic bead B2, the other end of the filtering magnetic bead B2 is connected with the common end of the relay K3, and is connected to a power supply IN-through a normally closed contact of the relay K3, so that a forward power supply is supplied to the direct current motor, the motor rotates forwards, and the rotating speed of the forward rotation is tested;
the second condition, MCU pin PB4 exports the high level, make triode Q2 base and Q3 base go up the electricity, triode Q2 base, projecting pole and Q3 base, the projecting pole switches on, triode Q2 collecting electrode, projecting pole and Q3 collecting electrode and, the projecting pole switches on, relay K2 coil and relay K3 coil circular telegram, relay K2 normally open contact and relay K2 normally open contact actuation, motor power IN + is connected to normally open contact through relay K1 public end like this, relay K1 normally open contact is connected to relay K3 normally open contact, relay K3 normally open contact connects the public end, relay K3 public end connects filtering magnetic bead B2, the filtering magnetic bead B2 other end is connected to the motor negative pole, the positive pole of the motor connects wave magnetic bead B1, the relay K2 public end is connected to the normally open contact, relay K2 normally open contact connects power IN-, add reverse power for direct current motor, the motor reverses, reverse rotation speed test carries out.
In an optional embodiment, a filter circuit is designed between the positive electrode and the negative electrode of the direct current motor, the filter circuit includes a filter magnetic bead B1, a filter magnetic bead B2, a filter capacitor C3, a filter capacitor C4, a filter capacitor C5 and a filter capacitor C6, and the other ends of the filter capacitor C5 and the filter capacitor C6 are connected to the motor housing.
In an optional embodiment, reverse discharge diodes D1, D2, D3 are respectively designed on coils of the relay K1, the relay K2, the relay K3, and the diodes D1, D2, D3 are respectively protection components for reverse discharge of the coil of the relay K1, the coil of the relay K2, and the coil of the relay K3.
In an optional embodiment, an input signal end of the rotation speed detection circuit is connected with a pin PA6_ ADC6 of the MCU circuit, the pin PA6_ ADC6 is connected with a filter capacitor C8, a connector between pages of the pin PA6_ ADC6 is H _ MCU, the H _ MCU is connected with a safety resistor R7, the other end of the safety resistor R7 is connected with an upper pull resistor R8 and an output end of the hall sensor U2, the upper pull resistor R8 is connected with a power input end of the hall sensor U2, and the input voltage of the power input end of the hall sensor U2 is 5V.
Illustratively, the hall sensor U2 adopts MT4103A, and when the dc motor rotates, the magnetic ring is driven to rotate, when the MT4103A senses the S pole of the magnetic pole, the high-level signal is output, and when the N pole of the magnetic pole is sensed, the low-level signal is output, and the output square wave pulse signal is fed back to the MCU pin PA6_ ADC6 to calculate the motor speed.
Illustratively, a pair of N poles and S poles is one magnetic pole number, the more the magnetic poles of the magnetic ring are, the higher the test speed precision is, and the motor speed formula is:
n represents the DC motor speed, p represents the number of magnetic poles, and t represents the sampling time.
Illustratively, the number of poles in FIG. 7 is 4, S for the south pole and N for the north pole.
The formula of the calculation accuracy of the motor rotating speed is as follows:
z represents the calculation precision of the motor rotating speed, p represents the number of magnetic poles, and the more p, the smaller Z is, and the more accurate the rotating speed is.
For example, the corresponding number of magnetic poles can be designed according to the requirement of the calculation accuracy of the motor rotating speed, for example, when the number of magnetic poles is 20, the calculation accuracy of the rotating speed is 0.05 r.
In an optional embodiment, the key circuit is designed with a start switch circuit and a stop switch circuit, the start switch circuit is powered by a 3.3V power supply and is connected with a pull-up resistor R27, the pull-up resistor R27 is connected with the MCU pin USBDM, the filter capacitor C39 and a 0 ohm resistor R24, the 0 ohm resistor R24 is connected with one pin of the start switch, and the other pin of the start switch is grounded.
Illustratively, when the rotating speed of the motor needs to be tested, the starting switch is pressed down, the voltage of the USBDM pin of the MCU is 0, the MCU supplies high level to the PB5 pin, the coil of the relay K1 is electrified, the normally open contact of the relay K1 is closed, power is supplied to the motor, and the rotating speed test is carried out.
In an alternative embodiment, the stop switch circuit is powered by a 3.3V power supply and is connected with a pull-up resistor R28, the pull-up resistor R28 is connected with the MCU pin USBDP, the filter capacitor C40 and a 0 ohm resistor R25, the 0 ohm resistor R25 is connected with one pin of the stop switch, and the other pin of the stop switch is grounded.
Illustratively, when the test is finished, the stop switch is pressed to enable the USBDP voltage of the MCU pin to be 0, the MCU supplies a low level to the PB5 pin, the coil of the relay K1 is powered off, the normally open contact of the relay K1 is disconnected, and the power supply to the motor is stopped.
In an optional embodiment, the pilot lamp designs red light circuit, green light circuit and blue light circuit, and red light circuit input is connected with MCU circuit's pin PB12, and current-limiting resistor R20 is connected to MCU circuit's pin PB12, and red light LED D5 positive pole is connected to current-limiting resistor R20, and red light LED D5 negative pole ground connection, green light circuit of same mode design and blue light circuit.
Illustratively, when the rotation speed of the motor is detected to be qualified, a pin PB13 of the MCU circuit outputs high level, and a green LED D6 is lightened; when the rotating speed of the motor is detected to be unqualified, a pin PB12 of the MCU circuit outputs a high level, and a red light LED D5 is lightened; when the motor rotating speed is detected, the pin PB14 of the MCU circuit outputs high level, and the blue light LED D7 is lightened.
IN an alternative embodiment, the power supply circuit is designed with an output voltage of 3.3V, 5V and a motor input voltage IN + \ IN-, respectively.
Illustratively, the motor input voltage is +24V \ 24V.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A circuit for detecting the rotating speed of a direct current motor is used for detecting the rotating speed of the forward rotation and the reverse rotation of the direct current motor, and is characterized by comprising an MCU circuit, a motor rotating circuit, a rotating speed detecting circuit, an indicator light, a power circuit, the direct current motor and a magnetic ring, wherein the MCU circuit is electrically connected with the motor rotating circuit, the rotating speed detecting circuit and the indicator light, the power circuit respectively provides direct current for the MCU circuit, the motor rotating circuit and the rotating speed detecting circuit, the rotating speed detecting circuit is fixed on a direct current motor shell, and the magnetic ring is fixed on a direct current motor rotating shaft outside the rotating speed detecting circuit;
the motor rotating circuit is provided with a motor power supply control circuit and a motor forward/backward rotation circuit and is realized by three triodes and relays, wherein the first triode and the relay are the motor power supply control circuit and control whether to supply power to the direct current motor, and the second triode and the third triode and the relay are the motor forward/backward rotation circuits and control the direct current motor to rotate forward and backward; the rotating speed detection circuit is provided with a Hall sensor, outputs pulse signals by sensing the magnetic poles of the magnetic rings and feeds the pulse signals back to the MCU to calculate the rotating speed, and the rotating speed is qualified to light a green light, unqualified to light a red light and light a green light during detection.
2. The circuit for detecting the rotating speed of the direct current motor according to claim 1, wherein the MCU circuit is powered by a 3.3V direct current power supply provided by a power supply circuit, and is designed with a clock circuit, a reset circuit and a filter capacitor.
3. The circuit for detecting the rotating speed of the direct current motor according to claim 1, wherein a signal input end of the motor power supply control circuit is connected with a pin JK _ CT of the MCU circuit, the pin JK _ CT of the MCU circuit is connected with one end of a resistor R1 of the motor rotation circuit, the other end of the resistor R1 is connected with a base of a triode Q1, an emitting electrode of the triode Q1 is grounded, a collector is connected with an anode of a diode D1 and a pin 1 of a coil of a relay K1, a cathode of the diode D1 is connected with a 5V direct current power supply and a pin 2 of the coil of the relay K1, a public end of the relay K1 is connected with a positive electrode of a motor power supply input IN +, and a normally open contact of the relay K1 is connected with a normally closed contact of a relay K2 and a normally open contact of a relay K3.
4. The circuit for detecting the rotating speed of the direct current motor according to claim 1, wherein the forward/reverse circuit of the motor is provided with two triodes and a relay circuit to complete the switching of the positive and negative poles of the motor, the input signal end of the forward/reverse circuit of the motor is connected with a pin JK _ CD of the MCU circuit, the pin JK _ CD of the MCU circuit is connected with one end of a resistor R3 of one circuit of the forward/reverse circuit of the motor, the other end of the resistor R3 is connected with a base electrode of a triode Q2, an emitting electrode of the triode Q2 is grounded, a collector electrode of the triode Q2 is connected with an anode of a diode D2 and a pin 1 of a coil of a relay K2, a cathode of the diode D2 is connected with a direct current power supply 5V and a pin 2 of the coil of the relay K2, a normally open contact of the relay K2 is connected with a negative input electrode IN of the power supply, and a common end of the relay K2 is connected with the positive pole of the direct current motor.
5. The circuit for detecting the rotating speed of the direct current motor according to claim 4, wherein a signal input end of the motor forward/reverse circuit is connected with a pin JK _ CD of the MCU circuit, the pin JK _ CD of the MCU circuit is connected with one end of a resistor R5 of the other circuit IN the motor forward/reverse circuit, the other end of the resistor R5 is connected with a base electrode of a triode Q3, an emitting electrode of the triode Q3 is grounded, a collector electrode of the triode Q3 is connected with an anode of a diode D3 and a pin 1 of a coil of a relay K3, a cathode of the diode D3 is connected with a direct current power supply 5V and a pin 2 of the coil of the relay K3, a normally closed contact of the relay K3 is connected with a negative input electrode IN of the motor, and a common end of the relay K3 is connected with a negative electrode of the direct current motor.
6. The circuit for detecting the rotating speed of the direct current motor according to claim 1, wherein a signal input end of the rotating speed detection circuit is connected with a pin H _ MCU of the MCU circuit, the pin H _ MCU of the MCU circuit is connected with a filter capacitor C8 and a resistor R7 of the rotating speed detection circuit, the other end of the filter capacitor C8 is grounded, the other end of the resistor R7 is connected with a pull-up resistor R8 and an output end of a Hall sensor U2, the pull-up resistor R8 is connected with a power supply input end of the Hall sensor U2, and 5V of voltage is input at the power supply input end of the Hall sensor U2.
7. The circuit for detecting the rotating speed of the direct current motor according to claim 1, wherein the indicator lamp is designed into a red lamp circuit, a green lamp circuit and a blue lamp circuit, the input end of the red lamp circuit is connected with a pin LED _ R of the MCU circuit, the pin LED _ R of the MCU circuit is connected with a current limiting resistor R20, the current limiting resistor R20 is connected with the anode of a red LED D5, the cathode of the red LED D5 is grounded, and the green lamp circuit and the blue lamp circuit are designed in the same way.
8. The circuit for detecting the rotating speed of a direct current motor according to claim 1, wherein the power circuit is respectively designed with an output voltage of 3.3V and an output voltage of 5V and a motor input voltage of IN + IN-.
9. The circuit for detecting the rotating speed of the direct current motor according to claim 1, wherein a filter circuit is designed between a positive pole and a negative pole of the direct current motor, the filter circuit comprises a relay K2, a common terminal of the relay K2 is connected with a filter magnetic bead B1, and the filter magnetic bead B1 is connected with a filter capacitor C5 and a filter capacitor C3; the filter circuit comprises a relay K3, a common end of which is connected with a filter magnetic bead B2, and the filter magnetic bead B2 is connected with a filter capacitor C6 and a filter capacitor C4; the other ends of the filter capacitor C5 and the filter capacitor C6 are connected with the motor shell.
10. The circuit for detecting the rotating speed of the direct current motor according to claim 3, wherein reverse discharge diodes D1, D2 and D3 are respectively designed on the coils of the relay K1, the relay K2 and the relay K3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222579125.7U CN218678878U (en) | 2022-09-28 | 2022-09-28 | Circuit for detecting rotating speed of direct current motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222579125.7U CN218678878U (en) | 2022-09-28 | 2022-09-28 | Circuit for detecting rotating speed of direct current motor |
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| Publication Number | Publication Date |
|---|---|
| CN218678878U true CN218678878U (en) | 2023-03-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222579125.7U Active CN218678878U (en) | 2022-09-28 | 2022-09-28 | Circuit for detecting rotating speed of direct current motor |
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| Country | Link |
|---|---|
| CN (1) | CN218678878U (en) |
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2022
- 2022-09-28 CN CN202222579125.7U patent/CN218678878U/en active Active
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