CN113541100A - DC motor locked rotor detection circuit and DC motor equipment - Google Patents
DC motor locked rotor detection circuit and DC motor equipment Download PDFInfo
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- CN113541100A CN113541100A CN202110997819.XA CN202110997819A CN113541100A CN 113541100 A CN113541100 A CN 113541100A CN 202110997819 A CN202110997819 A CN 202110997819A CN 113541100 A CN113541100 A CN 113541100A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0811—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for dc motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
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Abstract
The invention discloses a locked rotor detection circuit of a direct current motor and direct current motor equipment, which comprise a motor on-off component, a motor current sampling resistor, a first operational amplifier and a second operational amplifier; the motor on-off component is connected to the input end of the controlled motor and is used for controlling the on-off of the power supply current of the controlled motor; the motor current sampling resistor is connected with the controlled motor in series; the first operational amplifier is used for amplifying the voltage division value of the motor current sampling resistor to obtain a first amplified voltage division value; the second operational amplifier is used for receiving the first amplified partial pressure value, determining the working state of the direct current motor according to the first amplified partial pressure value and a preset standard partial pressure value, and enabling the motor on-off assembly to cut off the power supply of the controlled motor when the fact that the controlled motor is locked is determined. The invention is directly controlled by the logic circuit, and can quickly cut off the power supply under the condition that the motor has large current or short circuit, thereby improving the safety and stability of the motor operation.
Description
Technical Field
The invention relates to the field of motor monitoring, in particular to a direct current motor locked-rotor detection circuit and direct current motor equipment.
Background
At present most need use direct current motor's system all need set up motor stalling detection circuit usually, and direct current motor's control uses two lines to go on usually, because the motor changes along with ageing and site environment in the course of the work, and the operating condition changes and leads to the output torque not enough, and the stalling condition appears, leads to whole return circuit current to increase suddenly, and then causes the incident.
The anti-locked rotor function generally adopts the working steps as follows: signal conversion, amplification, comparison, output of state signal, MCU detection and output control. However, in this control method, because the MCU needs to participate in the work, the MCU needs a certain clock cycle, and after completing one or more commands, the MCU needs to jump to the logic entry of the control program to take over the control, which may delay several milliseconds to several tens of milliseconds, even longer, that is, the MCU software controls the write to detect that there is a certain time delay, the light person damages the device, and the heavy person has a fire, etc. that causes a serious disaster. In addition, if the MCU is excessively depended on, the control capability is lost if the MCU program runs away, and greater hidden danger is brought.
Therefore, how to solve the problem that the judgment speed is low and potential safety hazards exist due to the fact that a processor such as an MCU is required to intervene to detect motor stalling in the prior art is a problem to be urgently solved by technical personnel in the field.
Disclosure of Invention
The invention aims to provide a direct current motor locked-rotor detection circuit and direct current motor equipment, and aims to solve the problems that judgment speed is low and potential safety hazards exist due to the fact that processors such as an MCU (microprogrammed control unit) are required to be involved in motor locked-rotor detection in the prior art.
In order to solve the technical problem, the invention provides a locked rotor detection circuit of a direct current motor, which comprises a motor on-off component, a motor current sampling resistor, a first operational amplifier and a second operational amplifier;
the motor on-off component is connected to the input end of the controlled motor and is used for controlling the on-off of the power supply current of the controlled motor;
the motor current sampling resistor is connected with the controlled motor in series;
the first operational amplifier is used for amplifying the voltage division value of the motor current sampling resistor to obtain a first amplified voltage division value;
the second operational amplifier is used for receiving the first amplified partial pressure value, determining the working state of the direct current motor according to the first amplified partial pressure value and a preset standard partial pressure value, and when the fact that the controlled motor is locked is determined, the output end of the second operational amplifier sends a power-off signal to enable the motor on-off component to cut off power supply of the controlled motor.
Optionally, the dc motor locked-rotor detection circuit further includes a ripple filter capacitor;
the ripple filter capacitor is connected with the motor current sampling resistor in parallel.
Optionally, in the dc motor locked-rotor detection circuit, the dc motor locked-rotor detection circuit includes a plurality of ripple filter capacitors;
the ripple filter capacitors are arranged in parallel.
Optionally, the dc motor stalling detection circuit further includes a first input matching resistor and/or a second input matching resistor;
the first end of the first input matching resistor is connected to the first end of the motor current sampling resistor, and the second end of the first input matching resistor is connected to the first input end of the first operational amplifier;
and the first end of the second input matching resistor is connected to the second end of the motor current sampling resistor, and the second end of the second input matching resistor is connected to the second input end of the first operational amplifier.
Optionally, the dc motor stalling detection circuit further includes an output filter capacitor;
and the first end of the output filter capacitor is connected with the output end of the second operational amplifier, and the second end of the output filter capacitor is grounded.
Optionally, in the dc motor stalling detection circuit, the first operational amplifier and the second operational amplifier are LM358 operational amplifiers.
Optionally, the dc motor stalling detection circuit further includes an output current limiting resistor;
and the output end of the second operational amplifier is in signal connection with the motor on-off component through the output current limiting resistor.
Optionally, in the dc motor stalling detection circuit, the motor switching component includes a voltage dividing resistor, an active triode and a passive field effect transistor;
the positive electrode of the external power supply is respectively connected with the first end of the divider resistor and the drain electrode of the passive field effect transistor;
the source electrode of the passive field effect transistor is connected to the power input end of the controlled motor;
the second end of the divider resistor is respectively connected with the collector of the active triode and the grid of the passive field effect transistor;
the base electrode of the active triode is connected to the output end of the second operational amplifier, and the emitting electrode of the active triode is grounded.
Optionally, the dc motor stalling detection circuit further includes a processor;
and the input end of the processor is connected with the output end of the second operational amplifier and is used for recording locked rotor data of the controlled motor.
A DC motor apparatus comprising a DC motor stall detection circuit as claimed in any one of the above.
The invention provides a locked rotor detection circuit of a direct current motor, which comprises a motor on-off component, a motor current sampling resistor, a first operational amplifier and a second operational amplifier; the motor on-off component is connected to the input end of the controlled motor and is used for controlling the on-off of the power supply current of the controlled motor; the motor current sampling resistor is connected with the controlled motor in series; the first operational amplifier is used for amplifying the voltage division value of the motor current sampling resistor to obtain a first amplified voltage division value; the second operational amplifier is used for receiving the first amplified partial pressure value, determining the working state of the direct current motor according to the first amplified partial pressure value and a preset standard partial pressure value, and when the fact that the controlled motor is locked is determined, the output end of the second operational amplifier sends a power-off signal to enable the motor on-off component to cut off power supply of the controlled motor.
After the voltage of the sampling resistor is acquired, the sampling resistor is directly controlled through a logic circuit, the operation is completed through three steps of amplifying, comparing and outputting a control signal, the reaction speed is close to the light speed, the power is quickly and automatically cut off under the condition that a motor has a large current or a short circuit, and the running safety and the running stability of a direct current motor are greatly improved; and processors such as MCU are not relied on, the direct current motor is not protected due to software running away, and the working stability is further improved. The invention also provides the direct current motor equipment with the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a dc motor locked-rotor detection circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another embodiment of the locked-rotor detection circuit for a dc motor according to the present invention;
fig. 3 is a schematic structural diagram of another embodiment of the locked-rotor detection circuit for a dc motor according to the present invention.
Detailed Description
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the invention is to provide a locked rotor detection circuit of a direct current motor, the structure schematic diagram of one specific embodiment of which is shown in fig. 1, and is called as the first specific embodiment, and the locked rotor detection circuit comprises a motor on-off component K1, a motor current sampling resistor R3, a first operational amplifier U1A and a second operational amplifier U1B;
the motor on-off component K1 is connected to the input end of the controlled motor M1 and is used for controlling the on-off of the power supply current of the controlled motor M1;
the motor current sampling resistor R3 is connected with the controlled motor M1 in series;
the first operational amplifier U1A is used for amplifying the voltage division value of the motor current sampling resistor R3 to obtain a first amplified voltage division value;
the second operational amplifier U1B is configured to receive the first amplified divided voltage value, determine a working state of the direct current motor according to the first amplified divided voltage value and a preset standard divided voltage value, and when it is determined that the controlled motor M1 is locked, send a power-off signal to an output end of the second operational amplifier U1B, so that the motor switching-on/off component K1 cuts off power supply of the controlled motor M1.
In addition, the direct current motor locked rotor detection circuit further comprises a first input matching resistor R1 and/or a second input matching resistor R4;
a first end of the first input matching resistor R1 is connected to a first end of the motor current sampling resistor R3, and a second end of the first input matching resistor R1 is connected to a first input end of the first operational amplifier U1A;
a first end of the second input matching resistor R4 is connected to the second end of the motor current sampling resistor R3, and a second end of the second input matching resistor R4 is connected to the second input end of the first operational amplifier U1A.
The first input matching resistor R1 and the second input matching resistor R4 are connected with the first operational amplifier U1A in series and connected with the motor current sampling resistor R3 in parallel, so that the resistance of a shunt circuit where the first operational amplifier U1A is located is increased, the current is reduced, the working state of the first operational amplifier U1A is closer to an ideal state, and the accuracy of the first amplified voltage division value is improved. The first input matching resistor R1 and the second input matching resistor R4 may be provided at the same time, or only one of them may be provided, which is the case where both input matching resistors are provided in fig. 1.
As a preferred embodiment, the dc motor locked-rotor detection circuit further includes an output filter capacitor C6;
the first end of the output filter capacitor C6 is connected to the output end of the second operational amplifier U1B, and the second end of the output filter capacitor C6 is grounded. The output filter capacitor C6 is used for filtering noise in the output signal of the second operational amplifier U1B, so that signal fluctuation is prevented from being mistakenly identified as the power-off signal by the system, and the accuracy of locked-rotor identification is further improved.
In addition, the first operational amplifier U1A and the second operational amplifier U1B are LM358 operational amplifiers. The LM358 operational amplifier is a dual operational amplifier, and includes two independent operational amplifiers with high gain and internal frequency compensation inside, and is suitable for a single power supply with a wide range of power supply voltage, which can increase the versatility of the present invention.
Particularly, the direct current motor locked rotor detection circuit further comprises an output current limiting resistor R2;
the output end of the second operational amplifier U1B is in signal connection with the motor on-off component K1 through the output current limiting resistor R2.
The voltage and current level of the output signal of the second operational amplifier U1B may not be consistent with the working electric signal of the motor on-off component K1, and the invention adjusts the output signal of the second operational amplifier U1B by additionally installing the current limiting resistor, thereby reducing the requirement on the motor on-off component K1, widening the selection range and increasing the general applicability of the DC motor locked rotor detection circuit. The feedback end in fig. 1 is the output end of the second operational amplifier U1B, and the output electrical signal returns to the motor on-off component K1 to control the working state of the controlled motor M1, which is the same as that in the drawings of other specifications and is not described again.
As a specific implementation manner, the dc motor locked-rotor detection circuit further includes a processor;
the input end of the processor is connected with the output end of the second operational amplifier U1B and is used for recording locked rotor data of the controlled motor M1.
Taking fig. 1 as an example, in fig. 1, an output terminal of the first operational amplifier U1A is connected to a first input terminal of the second operational amplifier U1B for providing the first amplified divided voltage value, and a second input terminal of the second operational amplifier U1B is connected between the first standard voltage dividing resistor R6 and the second standard voltage dividing resistor R7, and the standard divided voltage value can be adjusted by adjusting a ratio of R6 to R7, of course, a 5V power supply is supplied to R6 and R7 in the figure, and a voltage value of the power supply can be adjusted accordingly according to actual conditions. In addition, fig. 1 further includes an operational amplifier feedback resistor R5, which is a necessary structure for implementing voltage amplification for the first operational amplifier U1A, and is not described herein again.
The treater can be local singlechip, data terminal or high in the clouds treater, is about to in the output access software system of second operational amplifier U1B, software can record and take over control afterwards in the hardware outage to send out the police dispatch newspaper or carry out other self-defined operations, leave and handle the record, increased the expansibility and the extensive nature of this application, promoted entire system's automation level simultaneously.
The invention provides a locked rotor detection circuit of a direct current motor, which comprises a motor on-off component K1, a motor current sampling resistor R3, a first operational amplifier U1A and a second operational amplifier U1B; the motor on-off component K1 is connected to the input end of the controlled motor M1 and is used for controlling the on-off of the power supply current of the controlled motor M1; the motor current sampling resistor R3 is connected with the controlled motor M1 in series; the first operational amplifier U1A is used for amplifying the voltage division value of the motor current sampling resistor R3 to obtain a first amplified voltage division value; the second operational amplifier U1B is configured to receive the first amplified divided voltage value, determine a working state of the direct current motor according to the first amplified divided voltage value and a preset standard divided voltage value, and when it is determined that the controlled motor M1 is locked, send a power-off signal to an output end of the second operational amplifier U1B, so that the motor switching-on/off component K1 cuts off power supply of the controlled motor M1. After the voltage of the sampling resistor is acquired, the sampling resistor is directly controlled through a logic circuit, the operation is completed through three steps of amplifying, comparing and outputting a control signal, the reaction speed is close to the light speed, the power is quickly and automatically cut off under the condition that a motor has a large current or a short circuit, and the running safety and the running stability of a direct current motor are greatly improved; and processors such as MCU are not relied on, the direct current motor is not protected due to software running away, and the working stability is further improved.
On the basis of the first specific embodiment, the misjudgment is further avoided, the locked rotor identification accuracy is improved, and the second specific embodiment is obtained, wherein a schematic circuit structure diagram of the first specific embodiment is shown in fig. 2 and comprises a motor on-off component K1, a motor current sampling resistor R3, a first operational amplifier U1A and a second operational amplifier U1B;
the motor on-off component K1 is connected to the input end of the controlled motor M1 and is used for controlling the on-off of the power supply current of the controlled motor M1;
the motor current sampling resistor R3 is connected with the controlled motor M1 in series;
the first operational amplifier U1A is used for amplifying the voltage division value of the motor current sampling resistor R3 to obtain a first amplified voltage division value;
the second operational amplifier U1B is configured to receive the first amplified divided voltage value, determine a working state of the direct current motor according to the first amplified divided voltage value and a preset standard divided voltage value, and when it is determined that the controlled motor M1 is locked, send a power-off signal to an output end of the second operational amplifier U1B, so that the motor switching-on/off component K1 cuts off power supply of the controlled motor M1;
the filter also comprises a ripple wave filter capacitor;
the ripple filter capacitor is connected with the motor current sampling resistor R3 in parallel.
Ripple often appears in controlled motor M1 in the operation process, the fluctuation from top to bottom of electric current promptly, for the crest of wave that avoids the ripple to arouse through surpass first operational amplifier U1A amplifies the back and surpass standard partial pressure leads to the erroneous judgement lock-rotor, need filter out the ripple, this embodiment will ripple filter capacitor connects in parallel on motor current sampling resistor R3, can effectively avoid the ripple to conduct to the first operational amplifier U1A in rear on, has got rid of the influence of ripple, has improved the degree of accuracy of lock-rotor judgement.
Furthermore, the direct current motor locked rotor detection circuit comprises a plurality of ripple wave filter capacitors;
the ripple filter capacitors are arranged in parallel.
A plurality of ripple wave filter capacitors connected in parallel are arranged, so that a better filtering effect can be obtained, and the interference effect of ripple waves is further reduced. C1, C2 and C3 in FIG. 2 are all the ripple filter capacitors.
On the basis of the second specific embodiment, the motor switching element K1 is further limited to obtain a third specific embodiment, and a schematic circuit structure diagram of the third specific embodiment is shown in fig. 3, and includes a motor switching element K1, a motor current sampling resistor R3, a first operational amplifier U1A, and a second operational amplifier U1B;
the motor on-off component K1 is connected to the input end of the controlled motor M1 and is used for controlling the on-off of the power supply current of the controlled motor M1;
the motor current sampling resistor R3 is connected with the controlled motor M1 in series;
the first operational amplifier U1A is used for amplifying the voltage division value of the motor current sampling resistor R3 to obtain a first amplified voltage division value;
the second operational amplifier U1B is configured to receive the first amplified divided voltage value, determine a working state of the direct current motor according to the first amplified divided voltage value and a preset standard divided voltage value, and when it is determined that the controlled motor M1 is locked, send a power-off signal to an output end of the second operational amplifier U1B, so that the motor switching-on/off component K1 cuts off power supply of the controlled motor M1;
the filter also comprises a ripple wave filter capacitor;
the ripple filter capacitor is connected with the motor current sampling resistor R3 in parallel;
the motor on-off component K1 comprises a voltage dividing resistor R8, an active triode Q2 and a passive field-effect tube Q1;
the positive electrode of an external power supply is respectively connected with the first end of the voltage-dividing resistor R8 and the drain electrode of the passive field-effect transistor Q1;
the source electrode of the passive field effect transistor Q1 is connected to the power supply input end of the controlled motor M1;
the second end of the divider resistor R8 is respectively connected to the collector of the active triode Q2 and the gate of the passive field effect transistor Q1;
the base of the active transistor Q2 is connected to the output terminal of the second operational amplifier U1B, and the emitter of the active transistor Q2 is grounded.
In this embodiment, the specific structure of the motor switching component K1 is further defined, that is, the voltage of the divider resistor R8 is adjusted by controlling the switching of the active triode Q2, and the voltage between the gate and the drain of the passive fet Q1 is further controlled, so as to control the switching of the controlled motor M1.
The invention also provides direct current motor equipment with the beneficial effects, and the direct current motor equipment comprises the direct current motor locked rotor detection circuit. The invention provides a locked rotor detection circuit of a direct current motor, which comprises a motor on-off component K1, a motor current sampling resistor R3, a first operational amplifier U1A and a second operational amplifier U1B; the motor on-off component K1 is connected to the input end of the controlled motor M1 and is used for controlling the on-off of the power supply current of the controlled motor M1; the motor current sampling resistor R3 is connected with the controlled motor M1 in series; the first operational amplifier U1A is used for amplifying the voltage division value of the motor current sampling resistor R3 to obtain a first amplified voltage division value; the second operational amplifier U1B is configured to receive the first amplified divided voltage value, determine a working state of the direct current motor according to the first amplified divided voltage value and a preset standard divided voltage value, and when it is determined that the controlled motor M1 is locked, send a power-off signal to an output end of the second operational amplifier U1B, so that the motor switching-on/off component K1 cuts off power supply of the controlled motor M1. After the voltage of the sampling resistor is acquired, the sampling resistor is directly controlled through a logic circuit, the operation is completed through three steps of amplifying, comparing and outputting a control signal, the reaction speed is close to the light speed, the power is quickly and automatically cut off under the condition that a motor has a large current or a short circuit, and the running safety and the running stability of a direct current motor are greatly improved; and processors such as MCU are not relied on, the direct current motor is not protected due to software running away, and the working stability is further improved.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is to be noted that, in the present specification, relational terms such as first and second, and the like are 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 phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The dc motor lock-rotor detection circuit and the dc motor apparatus provided by the present invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A locked rotor detection circuit of a direct current motor is characterized by comprising a motor on-off component, a motor current sampling resistor, a first operational amplifier and a second operational amplifier;
the motor on-off component is connected to the input end of the controlled motor and is used for controlling the on-off of the power supply current of the controlled motor;
the motor current sampling resistor is connected with the controlled motor in series;
the first operational amplifier is used for amplifying the voltage division value of the motor current sampling resistor to obtain a first amplified voltage division value;
the second operational amplifier is used for receiving the first amplified partial pressure value, determining the working state of the direct current motor according to the first amplified partial pressure value and a preset standard partial pressure value, and when the fact that the controlled motor is locked is determined, the output end of the second operational amplifier sends a power-off signal to enable the motor on-off component to cut off power supply of the controlled motor.
2. The locked rotor detection circuit of a direct current motor according to claim 1, further comprising a ripple filter capacitor;
the ripple filter capacitor is connected with the motor current sampling resistor in parallel.
3. The dc motor stall detection circuit of claim 2, wherein the dc motor stall detection circuit comprises a plurality of ripple filter capacitors;
the ripple filter capacitors are arranged in parallel.
4. The dc motor stall detection circuit of claim 1, further comprising a first input matching resistor and/or a second input matching resistor;
the first end of the first input matching resistor is connected to the first end of the motor current sampling resistor, and the second end of the first input matching resistor is connected to the first input end of the first operational amplifier;
and the first end of the second input matching resistor is connected to the second end of the motor current sampling resistor, and the second end of the second input matching resistor is connected to the second input end of the first operational amplifier.
5. The dc motor stall detection circuit of claim 1, further comprising an output filter capacitor;
and the first end of the output filter capacitor is connected with the output end of the second operational amplifier, and the second end of the output filter capacitor is grounded.
6. The dc motor stall detection circuit of claim 1, wherein the first operational amplifier and the second operational amplifier are LM358 operational amplifiers.
7. The locked rotor detection circuit of a direct current motor according to claim 1, further comprising an output current limiting resistor;
and the output end of the second operational amplifier is in signal connection with the motor on-off component through the output current limiting resistor.
8. The locked rotor detection circuit of a direct current motor according to claim 1, wherein the motor switching component comprises a voltage dividing resistor, an active triode and a passive field effect transistor;
the positive electrode of the external power supply is respectively connected with the first end of the divider resistor and the drain electrode of the passive field effect transistor;
the source electrode of the passive field effect transistor is connected to the power input end of the controlled motor;
the second end of the divider resistor is respectively connected with the collector of the active triode and the grid of the passive field effect transistor;
the base electrode of the active triode is connected to the output end of the second operational amplifier, and the emitting electrode of the active triode is grounded.
9. The dc motor stall detection circuit of any of claims 1-8, further comprising a processor;
and the input end of the processor is connected with the output end of the second operational amplifier and is used for recording locked rotor data of the controlled motor.
10. A dc motor apparatus, characterized in that the dc motor apparatus comprises a dc motor stall detection circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110997819.XA CN113541100A (en) | 2021-08-27 | 2021-08-27 | DC motor locked rotor detection circuit and DC motor equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110997819.XA CN113541100A (en) | 2021-08-27 | 2021-08-27 | DC motor locked rotor detection circuit and DC motor equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113541100A true CN113541100A (en) | 2021-10-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110997819.XA Pending CN113541100A (en) | 2021-08-27 | 2021-08-27 | DC motor locked rotor detection circuit and DC motor equipment |
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| CN (1) | CN113541100A (en) |
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2021
- 2021-08-27 CN CN202110997819.XA patent/CN113541100A/en active Pending
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