CN111585485A - DC motor stepless speed regulation controller capable of automatically identifying PWM signal and LIN communication signal - Google Patents
DC motor stepless speed regulation controller capable of automatically identifying PWM signal and LIN communication signal Download PDFInfo
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- CN111585485A CN111585485A CN202010530464.9A CN202010530464A CN111585485A CN 111585485 A CN111585485 A CN 111585485A CN 202010530464 A CN202010530464 A CN 202010530464A CN 111585485 A CN111585485 A CN 111585485A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
- H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
- H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
- H02P7/29—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using pulse modulation
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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
- 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
- H02H7/0854—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 responsive to rate of change of current, couple or speed, e.g. anti-kickback protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
Abstract
The invention relates to a DC motor stepless speed regulation controller capable of automatically identifying PWM signals and LIN communication signals, which comprises a control circuit board, wherein a circuit on the control circuit board comprises a power supply and signal port, a signal identification and processing unit, an ECU processing unit, an operation monitoring unit, an indicator lamp unit and a digital power driving unit, wherein the power supply and signal port is used for being connected with a power supply and a signal source and is connected with the signal identification and processing unit, the signal identification and processing unit is connected with the signal source and the ECU processing unit, the ECU processing unit is also connected with the digital power driving unit and an operation monitoring and protecting unit, and the operation monitoring and protecting unit is connected with the digital power driving unit and is also connected with the indicator lamp unit. The invention has few connecting lines, easy assembly and maintenance, flexible module matching and wide application range.
Description
Technical Field
The invention relates to the technical field of direct current motor controllers, in particular to an automatic signal identification and operation data interaction structure.
Background
The speed regulation of the current direct current motor has three modes: resistance wire voltage-dividing, voltage-reducing and speed-regulating, motor series-parallel speed-regulating and PWM speed-regulating.
The resistance wire voltage-dividing voltage-reducing speed-regulating method adopts a high-power winding resistor corresponding to the motor, and realizes the regulation of the power supply of the motor by serially connecting resistance wires with different resistance values in a power supply loop of the motor, thereby achieving the purpose of voltage-reducing speed-regulating. Because the extra high-power resistance wire is connected, the ineffective waste of energy consumption can be inevitably caused, and because the resistance wire can produce a large amount of heat during working, fire and faults are easily caused.
The motor series-parallel connection speed regulation method adopts a plurality of motor coil windings to realize the series connection and the parallel connection of the motors in the same system to the power supply through the switching of an external switch or a relay, solves the problem of energy consumption waste caused by resistance wire voltage division, but can only realize simple 2-3 gear adjustment and has a small speed regulation range. And because the power supply is connected in a hard mode, the current impact is large, and the external wiring is complex. If a motor of the system fails, the whole motor system can not work.
The PWM speed regulation method is a direct current motor speed regulation method widely adopted at present, adopts a speed regulation mode of driving a switching power supply by pulse width, has the advantages of simple hardware structure, high speed regulation precision and wide range, and can realize stepless regulation in a range of 0-100% theoretically. The motor inverter has the disadvantages that only one-way control can be realized, and because only input PWM signals can be received and amplified, the chopping frequency cannot be adjusted according to the characteristic difference of the motor, the matching of the motor is not very accurate, and the motor is easy to generate heat or the noise of the motor beat frequency and squeal is easy to cause.
No matter which mode is adopted, the motor receives the analog voltage signal, the signal is transmitted in a single direction, after the command is sent out, the motor executes or not, the module runs normally or not, and the master control party sending out the command can not know and manage.
Disclosure of Invention
The invention aims to improve and innovate the defects and problems in the prior art, and provides a DC motor stepless speed regulation controller which has a common PWM and LIN communication interface, automatically switches and can monitor the running state of a motor.
The technical scheme is that the DC motor stepless speed regulation controller capable of automatically identifying PWM signals and LIN communication signals is constructed, and the DC motor stepless speed regulation controller comprises a control circuit board, wherein a circuit on the control circuit board comprises a power supply and signal port, a signal identification and processing unit, an ECU processing unit, an operation monitoring unit, an indicator lamp unit and a digital power driving unit, the power supply and signal port is used for being connected with a power supply and a signal source and is connected with the signal identification and processing unit, the signal identification and processing unit is connected with the signal source and the ECU processing unit, the ECU processing unit is also connected with the digital power driving unit and an operation monitoring and protecting unit, and the operation monitoring and protecting unit is connected with the digital power driving unit and is also connected with the indicator lamp unit.
The signal identification and processing unit comprises an LIN communication module, a channel selection control circuit and a PWM signal level matching circuit, the channel selection control circuit comprises a toggle switch, one signal input end of the toggle switch is connected with a signal port, two signal output ends of the toggle switch are respectively an LIN communication end and a PWM communication end, the LIN communication end is connected with a processor in the ECU processing unit through the LIN communication module, and the PWM communication end is connected with the processor in the ECU through the PWM signal level matching circuit.
The ECU processing unit comprises an ARM core single chip microcomputer STM8S003F3P3TR, and a serial port pin and a timer pin of the single chip microcomputer are connected to the signal identification and processing unit and are respectively connected with an LIN communication end and a PWM communication end.
The operation monitoring unit comprises a safety piece directly connected in series with the input end of the power supply and an operation parameter acquisition and fault protection circuit, and the operation parameter acquisition and fault protection circuit is connected with the controlled motor and the singlechip; and comparing the running current value of the controlled motor with a preset value by the program in the singlechip, and cutting off a driving signal of a later stage if the running current value exceeds the preset value.
The indicator light unit comprises three LEDs which are respectively connected with and indicate power supply, operation and communication activities.
The digital power driving unit comprises a group of Darlington amplifying circuits and is connected with a timer pin of the singlechip.
The control circuit board is arranged in the n-shaped shell, the shell is formed by processing a section of a die-casting aluminum profile, and comprises radiating fins arranged at the top and a mounting plate arranged at the bottom, and fixing holes are formed in the mounting plate.
The invention has the advantages and beneficial effects that: the signal identification and processing unit can automatically identify whether LIN communication signals or PWM signals are input by the signal port, and the signals are accessed into the corresponding ECU port for processing, and the digital control and real-time running state data acquisition and analysis of the motor power output circuit are realized through the singlechip by combining the PWM speed regulation mode and the intelligent bus circuit, and the digital interaction is realized through the intelligent bus and the motor control mode, so that the bidirectional control of the motor is realized. The following advantages are also provided:
1. the automatic identification function of the control signal is provided, and the automatic identification device can be compatible with new and old electric control systems;
2. the motor has a data bidirectional interaction function, and can realize intelligent management of the motor;
3. the energy is saved, the environment is protected, the precision control is realized, and the electric energy conversion efficiency is high;
4. few connecting lines, easy assembly and maintenance, flexible module matching and wide application range.
Drawings
Fig. 1 is a schematic structural diagram of the embodiment.
Fig. 2 is a sectional view of the embodiment.
Fig. 3 is a schematic structural diagram of the control circuit board of the embodiment.
Fig. 4 is a circuit diagram of a LIN communication processing unit.
Fig. 5 is a diagram of an input signal dial selection circuit.
Fig. 6 is a PWM signal level matching circuit diagram.
Fig. 7 is a schematic diagram of the connection of the dip switch.
Fig. 8 is a schematic structural diagram of the single chip microcomputer.
Fig. 9 is a schematic diagram of a hard protection circuit.
Fig. 10 is a soft protection circuit diagram.
Fig. 11 is a circuit diagram of an operation and communication indicator light.
Fig. 12 is a circuit diagram of a PWM digital drive unit.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "disposed" on another element, it can be directly disposed or attached to the other element or intervening elements may also be present. 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 are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Example 1
As shown in fig. 1 and 2, the dc motor stepless speed regulation controller capable of automatically identifying PWM signals and LIN communication signals comprises an n-shaped housing 1 and a control circuit board 2 arranged in the housing 1, wherein the top of the housing 1 is provided with a heat sink 3, the bottom of the housing is provided with a mounting plate 4, and the mounting plate 4 is provided with a fixing hole 5.
As shown in fig. 3, the circuit on the control circuit board 2 includes a power and signal port 6, a signal recognition and processing unit 7, an ECU processing unit 8, an operation monitoring and protection unit 9, an indicator light unit 10, and a digital power driving unit 12, the power and signal port 6 is used for connecting a power and signal source 11 and connecting the signal recognition and processing unit 7, the signal recognition and processing unit 7 is connected with the signal source 11 and the ECU processing unit 8, the ECU processing unit 8 is further connected with the digital power driving unit 12 and the operation monitoring and protection unit 9, the operation monitoring and protection unit 9 is connected with the digital power driving unit 12, the indicator light unit 10 is further connected, and the digital power driving unit 12 is connected with a load motor 30.
The signal identification and processing unit 7 comprises a channel selection control circuit (figure 5), an LIN communication module (figure 4) and a PWM signal level matching circuit (figure 5), wherein the channel selection control circuit comprises a toggle switch, one signal input end of the toggle switch is connected with a signal port, two signal output ends of the toggle switch are respectively an LIN communication end and a PWM communication end, the LIN communication end is connected with a processor in the ECU processing unit through the LIN communication module, and the PWM communication end is connected with the processor in the ECU through the PWM signal level matching circuit. In fig. 4, the single chip microcomputer communicates with a LIN level conversion chip U2 (TJA 1021) through serial port communication (RX, TX), converts the data into standard LIN 2.0 format data through internal circuits of a chip U2, and outputs a LIN signal from a LIN output pin (6) of the chip U2. D3 (BAW 56 LTG) and R40 are LIN signal pull-up clamping circuits, D4 (MMBZ 27VCLT 1) is a LIN signal TVS transient noise elimination protection circuit, and a 12V power supply is connected through a 7-pin and a 5-pin. The external control signal is connected to the toggle switch (SW 2) through the PWM interface, and is respectively connected to the PWM-1 and LINBUS processing circuits through switch selection according to different input signal types, and only one input state can be selected each time.
When the external access is a PWM signal, 2-3 and 4-5 pins of a toggle switch (SW 2) are accessed into a PWM channel (refer to a picture F1-1), and then the PWM channel is subjected to voltage reduction and clamping by a signal level matching circuit (refer to a picture F1-2) and then is input into a U1 (STM 8S003F3P6 TR) chip 10 pin (PWM-2) as input for reading and identifying a singlechip program.
When an externally-connected LIN signal is received, the pin 6 (LINBUS) of a LIN communication special chip U2 (TJA 1050) is connected through toggle switches (SW 2) 1-2 and 5-6 pins (refer to F1-1), then the pin 1 (RXD) and the pin 4 (TXD) of the U2 (TJA 1050) are connected to corresponding interfaces of a singlechip U1 (STM 8S003F3P6 TR), and the externally-input LIN control signal is processed through a singlechip program.
As shown in fig. 8, the ECU processing unit includes a single chip microcomputer STM8S003F3P3TR of an ARM core, which is the processor, and a serial port pin and a timer pin of the single chip microcomputer are both connected to the signal identification and processing unit 7 and respectively connected to the LIN communication terminal and the PWM communication terminal. The single chip microcomputer U1 (STM 8S003F3P6 TR) is an 8-bit RAM system, wherein a pin 1 (TCK/SWCLK) and a pin 18 (TMS/SWDIO) are chip programming interfaces, and a pin 9 (3.3V) and a pin 7 (GND) are connected in series. The power supply input interface is a chip power supply input interface, and the pins 5 and 6 are chip crystal oscillator (clock) input interfaces; and the pin 2 (TX) and the pin 3 (RX) are chip serial port communication interfaces and are connected with an external LIN level conversion chip. External data acquisition: a19 pin (BAT _ V) is used for collecting working power supply voltage, a 20 pin (PWM-4) is used for collecting and inputting motor current signals, 14-17 pins (S1-4) are used for identifying motor codes, and a10 pin (PWM-2) is used for collecting and identifying input PWM signals. The single chip microcomputer outputs signals: the pin 13 (PWM-3) is the output PWM driving signal, the pin 12 (PWM-LED) is the input PWM indication signal, and the pin 11 (LIN-LED) is the input LIN indication signal.
The operation monitoring unit 9 comprises a safety piece (FU 1 in figure 9) directly connected in series with the input end of the power supply, and an operation parameter acquisition and fault protection circuit (figure 10) comprising comparators U5A and U5B, wherein the operation parameter acquisition and fault protection circuit is connected with the controlled motor and the singlechip; the real-time running current of the motor (10) is monitored through a sampling resistor RS1 (constantan wire), amplified and calibrated by an operational amplifier comparator U5, input to a 20-pin PWM-4 of a single chip microcomputer U1 (STM 8S003F3P6 TR), if the current exceeds a program preset value, a PWM driving signal of a 13-pin PWM-3 of the single chip microcomputer is immediately cut off, the motor stops running, and the purpose of protecting the motor is achieved.
The indicator light unit comprises three LEDs which are respectively connected with and indicate power supply, operation and communication activities. Fig. 11 shows a communication activity indicator light, which is connected to the single chip, and when the external access signal is a PWM signal, a 12-pin (PWM-LED) outputs a low level, and the PWM-LED indicator light is turned on. When the external access signal is a LIN signal, the 11 pin (LIN-LED) outputs low level, and the LIN-LED indicator lamp is lightened. In fig. 9, the LED lamp FU-ERR connected in parallel with the safety fuse FU1 is a power indicator lamp. The safety piece (FU 1) direct access main power supply circuit, if appear the short circuit or heavy current direct fusing, play the protection back stage circuit effect, the fusing back electric current passes through red emitting diode FU-ERR and step-down resistance R10, and the pilot lamp is luminous to indicate the insurance fusing, and the pilot lamp is not bright during normal.
As shown in fig. 12, the digital power driving unit 12 includes a set of darlington amplifying circuits connected to a timer pin of the single chip. The PWM switching signal sent by the ECU is received and amplified, and the amplified PWM switching signal is continuously transmitted to a motor load, and the frequency and the duty ratio of the driving signal are changed by the ECU so as to achieve the purpose of driving the motor to operate at a regulated speed. The method specifically comprises the following steps: after receiving an external PWM signal or LIN signal and being processed and identified by an internal program, the single chip microcomputer outputs a PWM driving signal required by an external control program from a U1 (STM 8S003F3P6 TR) pin 13 (PWM-3), the PWM driving signal enters a post-stage Darlington amplifying circuit consisting of Q3 (2N 5551) and Q4 (2N 5401) through pre-stage phase inversion amplification, then drives a Q5 (RF 4905) MOSFET power switching tube through an R15 resistor, and supplies energy required by work for a load motor through the on-off of a high-frequency switch of Q5, D1 (MBR 20100 CT) is a free wheel diode, and the back electromotive force generated on a coil of the discharge motor is discharged during the turn-off of Q5. The motor can run smoothly without high-frequency vibration.
The shell is formed by processing a section of a die-casting aluminum profile, and is heat-dissipating and firm. As shown in fig. 2, the circuit control board and the energy storage capacitor are welded together and fixed on the heat sink shell through mounting screws, the power switch tube (Q5) and the freewheeling diode (D1) on the circuit board are tightly attached to the heat conducting plane of the heat sink, and the energy storage capacitor is tightly attached to the heat conducting arc surface of the heat sink. So that the heat of the power device can be instantly conducted and dissipated to the outside. After the integrated module is installed, the potting adhesive and the radiating fins are filled integrally to form an integrated module. The finished module after encapsulation and solidification has good heat conduction, waterproof and dustproof protection performances.
The signal recognition and processing unit 7 further comprises a 4-bit dial switch as a motor serial number setting circuit, as shown in fig. 7, the dial switchSW1 connects the singlechip, sets up different motor codes (serial numbers) in the same network through dial-up state, makes things convenient for the program network deployment management. 16 (2) can be realized by selecting different positions (4 different permutation combinations of binary 0 and 1) through a 4-bit dial switch SW14= 16) different coding combinations, the single chip microcomputer collects high and low level signals of pins S1, S2, S3 and S4 through an IO port (default internal pull-up high level), and the signals are converted into corresponding motor label data through an internal coding circuit of a chip of the single chip microcomputer U1 (STM 8S003F3P6 TR), and the system can support 16-position motor coding at most. The corresponding motor data message can be correspondingly assigned in a LIN bus mode.
FIG. 1 shows the finished module of the present invention, in which the safety piece FU1, indicator light, dial switch for motor coding and input dial switch for input signal selection are all arranged on the front face of the finished module, and the side face is provided with power supply, motor and signal input insertion piece.
The invention can be applied to an intelligent speed regulation circuit system of fans of an automobile air conditioner, realizes stepless intelligent speed regulation and real-time intelligent management of the amount of evaporated air in an automobile through an automobile LIN bus, can visually display the running state parameters of each fan by an automobile central control system, and can realize bidirectional intelligent management through the Internet of things while the motor is not a unidirectional independent execution terminal any more.
The invention can also be applied to a production line control system of a multi-path motor, intelligent management and real-time independent control of each unit of the production line can be realized through one LIN bus data line, and cooperative work can be realized for different use scenes of different clients according to different combinations through the control terminal.
The embodiments of the present invention are described only for the preferred embodiments of the present invention, and not for the limitation of the concept and scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall into the protection scope of the present invention, and the technical content of the present invention which is claimed is fully set forth in the claims.
Claims (7)
1. But stepless speed regulation controller of direct current motor of automatic identification PWM signal and LIN communication signal, its characterized in that: the intelligent control system comprises a control circuit board, the last circuit of control circuit board includes power and signal port, signal identification and processing unit, ECU processing unit, operation monitoring unit, pilot lamp unit, digital power drive unit, power and signal port be used for connecting power and signal source to signal identification and processing unit, signal identification and processing unit connect signal source and ECU processing unit, digital power drive unit and operation control and protection unit are still connected to ECU processing unit, operation control and protection unit are connected with digital power drive unit, still connect the pilot lamp unit.
2. The dc motor stepless speed regulation controller capable of automatically identifying the PWM signal and the LIN communication signal according to claim 1, wherein: the signal identification and processing unit comprises an LIN communication module, a channel selection control circuit and a PWM signal level matching circuit, the channel selection control circuit comprises a toggle switch, one signal input end of the toggle switch is connected with a signal port, two signal output ends of the toggle switch are respectively an LIN communication end and a PWM communication end, the LIN communication end is connected with a processor in the ECU processing unit through the LIN communication module, and the PWM communication end is connected with the processor in the ECU through the PWM signal level matching circuit.
3. The dc motor stepless speed regulation controller capable of automatically identifying the PWM signal and the LIN communication signal according to claim 1, wherein: the ECU processing unit comprises an ARM core single chip microcomputer STM8S003F3P3TR, and a serial port pin and a timer pin of the single chip microcomputer are connected to the signal identification and processing unit and are respectively connected with an LIN communication end and a PWM communication end.
4. The dc motor stepless speed regulation controller capable of automatically identifying the PWM signal and the LIN communication signal according to claim 1, wherein: the operation monitoring unit comprises a safety piece directly connected in series with the input end of the power supply and an operation parameter acquisition and fault protection circuit, and the operation parameter acquisition and fault protection circuit is connected with the controlled motor and the singlechip; and comparing the running current value of the controlled motor with a preset value by the program in the singlechip, and cutting off a driving signal of a later stage if the running current value exceeds the preset value.
5. The dc motor stepless speed regulation controller capable of automatically identifying the PWM signal and the LIN communication signal according to claim 1, wherein: the indicator light unit comprises three LEDs which are respectively connected with and indicate power supply, operation and communication activities.
6. The dc motor stepless speed regulation controller capable of automatically identifying the PWM signal and the LIN communication signal according to claim 1, wherein: the digital power driving unit comprises a group of Darlington amplifying circuits and is connected with a timer pin of the singlechip.
7. The dc motor stepless speed regulation controller capable of automatically identifying the PWM signal and the LIN communication signal according to claim 1, wherein: the control circuit board is arranged in the n-shaped shell, the shell is formed by processing a section of a die-casting aluminum profile, and comprises radiating fins arranged at the top and a mounting plate arranged at the bottom, and fixing holes are formed in the mounting plate.
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