CN115864906B - Rotational speed correction circuit and method for direct-current brushless outer rotor motor - Google Patents
Rotational speed correction circuit and method for direct-current brushless outer rotor motor Download PDFInfo
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Abstract
The invention provides a rotational speed correction circuit and method of a direct current brushless outer rotor motor, comprising the following steps: the device comprises a signal input circuit, an induction signal amplifying circuit and a motor control chip; the output end of the signal input circuit is connected with the input end of the motor control chip, the output end of the motor control chip is electrically connected with the input end of the motor, the output end of the induction coil of the motor is connected with the input end of the induction signal amplifying circuit, and the output end of the induction signal amplifying circuit is connected with the input end of the motor control chip; after the motor control chip reads the signal input by the signal input circuit and enables the motor to normally rotate, the induction signal is amplified by the induction signal amplifying circuit and then input into the motor control chip to count the induction signal, the frequency of the induction signal is obtained, the deviation between the frequency and the frequency of the input signal is equal to the deviation of a chip clock, the deviation value is used for correcting the frequency of the input signal in real time, and the stability and consistency of the output rotating speed of the motor are improved.
Description
Technical Field
The invention relates to the technical field of motor control, in particular to a rotating speed correcting circuit and method of a direct-current brushless outer rotor motor.
Background
The DC brushless external rotor motor, namely the rotor of the motor is outside and the stator is inside. The outer rotor motor is characterized in that the original magnetic steel at the center is made into a piece and is attached to the shell, when the motor operates, the whole shell rotates, and the middle coil stator is fixed. The rotor brushless DC motor has much larger moment of inertia than the rotor (because the main mass of the rotor is concentrated on the housing), so the rotating speed is slower than that of the rotor motor, and the KV value is usually between hundreds and thousands.
The rotating speed of the direct current brushless outer rotor motor is mainly controlled by an external frequency signal or a duty ratio signal, and as the internal clock frequency of the motor control chip is generated by an RC oscillator in the chip, the frequency stability is poor, the temperature drift is large, the deviation of reading the external signal is large, the motor rotating speed has larger deviation from the actual demand rotating speed of a user, and the consistency of the motor rotating speed is poor.
Disclosure of Invention
The invention provides a rotating speed correcting circuit and method of a direct current brushless outer rotor motor, and aims to improve the stability and consistency of the output rotating speed of the motor by realizing that the signal frequency is not influenced by factors such as a chip production process, temperature drift and the like.
In order to achieve the above object, the present invention provides a rotational speed correction circuit of a dc brushless outer rotor motor, comprising: the device comprises a signal input circuit, an induction signal amplifying circuit and a motor control chip;
the output end of the signal input circuit is connected with the input end of the motor control chip, the output end of the motor control chip is electrically connected with the input end of the motor, the output end of the induction coil of the motor is connected with the input end of the induction signal amplifying circuit, and the output end of the induction signal amplifying circuit is connected with the input end of the motor control chip;
the motor control chip obtains a CLK signal through the signal input circuit, controls the motor to rotate through the CLK signal, and outputs induction signals at two ends of an induction coil of the motor;
the induction signal amplifying circuit amplifies the induction signal and inputs the amplified induction signal to the positive end of a comparator in the motor control chip;
the motor control chip compares a signal input into the positive end of the comparator with a voltage signal input into the negative end of the comparator to obtain a comparison result, and calculates low-level time and high-level time of an output signal of the comparator according to the comparison result; inputting the low-level time and the high-level time into a timer in a motor control chip, and counting by the timer to obtain the frequency of the induction signal; and comparing the frequency of the induction signal with the frequency of the CLK signal to obtain frequency deviation, and correcting the rotating speed of the motor in real time by using the frequency deviation.
Further, the signal input circuit includes:
the first resistor, the second resistor, the third resistor and the first capacitor;
one end of the first resistor is connected with a power supply, the other end of the first resistor is connected with one end of the second resistor and one end of the first capacitor respectively, the other end of the first capacitor is grounded, the other end of the second resistor is connected with one end of the third resistor and the input end of the motor control chip respectively, and the other end of the third resistor is grounded.
Further, the model of the motor control chip is CMS32M5526SS024, a comparator and a timer are integrated in the motor control chip, a first pin of the motor control chip is connected with the other end of the second resistor, and a second pin of the motor control chip is connected with the output end of the induction signal amplifying circuit.
Further, the sense signal amplifying circuit includes:
a second capacitor, a fourth resistor, a fifth resistor, a sixth resistor, a third capacitor, a twenty-seventh resistor, a fifth capacitor, a seventh resistor and a first amplifier;
one end of the second capacitor is connected with the positive electrode end of the induction coil of the motor, the other end of the second capacitor is connected with one end of the fourth resistor, the other end of the fourth resistor is respectively connected with one end of the fifth resistor, one end of the sixth resistor, a fourth pin of the motor control chip, one end of the third capacitor and the positive input end of the first amplifier, the other end of the fifth resistor is connected with the sixteenth pin of the motor control chip, and the other end of the sixth resistor is connected with the other end of the third capacitor and grounded;
One end of a twenty-seventh resistor is connected with the negative electrode end of an induction coil of the motor, the other end of the twenty-seventh resistor is respectively connected with the negative input end of the first amplifier, the third pin of the motor control chip, one end of the seventh resistor and one end of the fifth capacitor, the other end of the seventh resistor and the other end of the fifth capacitor are connected with the output end of the first amplifier, and the output end of the first amplifier is connected with the second pin of the motor control chip.
Further, the motor driving circuit also comprises a motor power supply circuit and a driving circuit;
the motor power supply circuit comprises a sixth capacitor, an eighth resistor, a ninth resistor, a seventh capacitor, an eighth capacitor, a zener diode, a fuse and an external port;
the input end of the fuse is connected with a first pin of the external port, the output end of the fuse is respectively connected with the cathode of the voltage stabilizing diode, the anode of the eighth capacitor and one end of the seventh capacitor, the other end of the seventh capacitor is respectively connected with the cathode of the eighth capacitor and the anode of the voltage stabilizing diode, and is grounded, and the anode of the voltage stabilizing diode is connected with a second pin of the external port; one end of the sixth capacitor is connected with a twenty-fourth pin of the motor control chip, one end of the eighth resistor and one end of the ninth resistor respectively, the other end of the ninth resistor is connected with a fourth pin of the external port, the other end of the eighth resistor is connected with a twentieth pin of the motor control chip, and the other end of the sixth capacitor is grounded;
The driving circuit comprises a first coupling capacitor, a second coupling capacitor, a third coupling capacitor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty first resistor, a twenty second resistor, a twenty third resistor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a first switching tube, a second switching tube and a third switching tube;
one end of the first coupling capacitor is respectively connected with one end of a twenty-second resistor, one end of a twenty-third resistor, one end of a sixteenth resistor, one end of a ninth capacitor and a first pin of a first switching tube, the other end of the twenty-second resistor is connected with the other end of the twenty-third resistor and grounded, the other end of the first coupling capacitor is respectively connected with one end of a seventeenth resistor, one end of a tenth capacitor and a third pin of the first switching tube, one end of the tenth resistor is connected with a fifteenth pin of a motor control chip, the other end of the tenth resistor is respectively connected with the other end of the sixteenth resistor, the other end of the ninth capacitor and a second pin of the first switching tube, one end of the eleventh resistor is connected with a fourteenth pin of the motor control chip, the other end of the eleventh resistor is connected with the seventeenth resistor, the other end of the tenth capacitor and a fourth pin of the first switching tube, and fifth pins, sixth pins and eighth pins of the first switching tube are all connected with a U-phase end of the motor;
One end of the second coupling capacitor is respectively connected with one end of a twenty-second resistor, one end of a twenty-third resistor, one end of an eighteenth resistor, one end of an eleventh capacitor and a first pin of a second switching tube, the other end of the second coupling capacitor is respectively connected with one end of a nineteenth resistor, one end of the twelfth capacitor and a third pin of the second switching tube, one end of the twelfth resistor is connected with a thirteenth pin of a motor control chip, the other end of the twelfth resistor is respectively connected with the other end of the eighteenth resistor, the other end of the eleventh capacitor and a second pin of the second switching tube, one end of the thirteenth resistor is connected with a twelfth pin of the motor control chip, the other end of the thirteenth resistor is connected with the other end of the nineteenth resistor, the other end of the twelfth capacitor and a fourth pin of the second switching tube, and fifth pins, sixth pins, seventh pins and eighth pins of the second switching tube are all connected with V-phase ends of the motor;
one end of a third coupling capacitor is respectively connected with one end of a twenty-second resistor, one end of a twenty-third resistor, one end of a thirteenth capacitor and a first pin of a third switching tube, the other end of the third coupling capacitor is respectively connected with one end of a twenty-first resistor, one end of a fourteenth capacitor and a third pin of the third switching tube, one end of the fourteenth resistor is connected with an eleventh pin of a motor control chip, the other end of the fourteenth resistor is respectively connected with the other end of the twenty-first resistor, the other end of the thirteenth capacitor and a second pin of the third switching tube, one end of the fifteenth resistor is connected with a tenth pin of the motor control chip, the other end of the fifteenth resistor is connected with the other end of the twenty-first resistor, the other end of the fourteenth capacitor and a fourth pin of the third switching tube, and the fifth pin, the sixth pin, the seventh pin and eighth pin of the third switching tube are all connected with a W-phase end of the motor.
Further, the circuit also comprises a locking circuit;
the locking circuit comprises a twenty-fourth resistor, a twenty-fifth resistor and a fifteenth capacitor;
one end of the twenty-fourth resistor is connected with a third pin of the external port, the other end of the twenty-fourth resistor is respectively connected with one end of the twenty-fifth resistor, one end of the fifteenth capacitor and a twenty-first pin of the motor control chip, the other end of the twenty-fifth resistor is connected with the twentieth pin of the motor control chip, and the other end of the fifteenth capacitor is grounded.
Further, the circuit also comprises an RC filter circuit;
the RC filter circuit comprises a fourth capacitor and a twenty-sixth resistor;
one end of the fourth capacitor is connected with the output end of the first amplifier and the second pin of the motor control chip respectively, the other end of the fourth capacitor is connected with one end of the twenty-sixth resistor, and the other end of the twenty-sixth resistor is connected with the twenty-third pin of the motor control chip.
Further, the motor rotor position sensing circuit is composed of a plurality of Hall sensors and a matching circuit thereof; the output end of the motor rotor position sensing circuit is connected with a twenty-second pin of the motor control chip.
The invention also provides a rotational speed correction method of the direct current brushless outer rotor motor, which is applied to the rotational speed correction circuit of the direct current brushless outer rotor motor, and comprises the following steps:
Step 1, a motor control chip obtains an externally input CLK signal through a signal input circuit and controls a motor to enter closed loop starting according to the CLK signal;
step 2, after the motor rotates, controlling a magnetic field induction coil on a main control circuit board to cut a magnetic field generated by secondary punching, and outputting induction signals at two ends of the induction coil of the motor;
step 3, the induction signal is amplified by an induction signal amplifying circuit and then is input into the positive end of a comparator in a motor control chip;
step 4, the motor control chip compares the signal input into the positive end of the comparator with the voltage signal of the negative end of the comparator to obtain a comparison result, and calculates the low-level time and the high-level time of the output signal of the comparator according to the comparison result;
step 5, inputting the low-level time and the high-level time into a timer in the motor control chip, and counting by the timer to obtain the frequency of the induction signal;
and 6, comparing the frequency of the induction signal with the frequency of the CLK signal to obtain frequency deviation, and correcting the rotating speed of the motor in real time by using the frequency deviation.
The scheme of the invention has the following beneficial effects:
the invention provides a rotating speed correcting circuit, which comprises a signal input circuit, an induction signal amplifying circuit and a motor control chip, wherein the motor control chip sets the rotating speed of a motor after reading the input signal of the signal input circuit, after the motor rotates normally, the induction signal is amplified by the induction signal amplifying circuit and then is input into the motor control chip to count the induction signal, the frequency deviation of the frequency and the frequency of the input signal is equal to the deviation of a chip clock, the frequency of the input signal is corrected in real time by using the deviation, and the read frequency of the input signal is not influenced by factors such as a chip production process, temperature drift and the like, so that the stability and consistency of the output rotating speed of the motor are improved.
Other advantageous effects of the present invention will be described in detail in the detailed description section which follows.
Drawings
FIG. 1 is a circuit block diagram of an embodiment of the present invention;
FIG. 2 is a diagram of a signal input circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a motor control chip according to an embodiment of the present invention;
FIG. 4 is a diagram of an amplifying circuit of an induction signal according to an embodiment of the present invention;
FIG. 5 is a diagram of a motor power circuit and a driving circuit in an embodiment of the invention;
FIG. 6 is a latch circuit according to an embodiment of the invention;
fig. 7 (a) is a circuit diagram of a motor rotor position sensing circuit according to an embodiment of the present invention; (b) The circuit is a sampling signal amplifying circuit in the embodiment of the invention, and (c) the jumper resistor connection diagram in the embodiment of the invention;
fig. 8 is a flow chart of a motor rotation speed correction method according to an embodiment of the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, a locked connection, a removable connection, or an integral connection; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The invention provides a rotating speed correcting circuit and method of a direct current brushless outer rotor motor aiming at the existing problems.
As shown in fig. 1, an embodiment of the present invention provides a rotational speed correction circuit of a dc brushless outer rotor motor, including: the device comprises a signal input circuit, an induction signal amplifying circuit and a motor control chip;
the output end of the signal input circuit is connected with the input end of the motor control chip, the output end of the motor control chip is electrically connected with the input end of the motor, the output end of the induction coil of the motor is connected with the input end of the induction signal amplifying circuit, and the output end of the induction signal amplifying circuit is connected with the input end of the motor control chip;
the motor control chip obtains a CLK signal through the signal input circuit, controls the motor to rotate through the CLK signal, and outputs induction signals at two ends of an induction coil of the motor;
the induction signal amplifying circuit amplifies the induction signal and inputs the amplified induction signal to the positive end of a comparator in the motor control chip;
the motor control chip compares a signal input into the positive end of the comparator with a voltage signal input into the negative end of the comparator to obtain a comparison result, and calculates low-level time and high-level time of an output signal of the comparator according to the comparison result; inputting the low-level time and the high-level time into a timer in a motor control chip, and counting by the timer to obtain the frequency of the induction signal; and comparing the frequency of the induction signal with the frequency of the CLK signal to obtain frequency deviation, and correcting the rotating speed of the motor in real time by using the frequency deviation.
Specifically, as shown in fig. 2, the signal input circuit, the input signal is a CLK clock signal, the motor sets the rotation speed of the motor according to the frequency of the input signal, and the rotation speed of the motor is equal to the frequency of the input signal by 60/motor pair magnetic pole pairs, and the signal input circuit comprises:
the first resistor R1, the second resistor R2, the third resistor R3 and the first capacitor C1;
one end of the first resistor R1 is connected with a sixteenth pin of the motor control chip, the other end of the first resistor R1 is connected with one end of the second resistor R2 and one end of the first capacitor C1 respectively, the other end of the first capacitor C1 is grounded GND, the other end of the second resistor R2 is connected with one end of the third resistor R3 and the input end of the motor control chip respectively, and the other end of the third resistor R3 is grounded GND.
Specifically, as shown in fig. 3, the model of the motor control chip is CMS32M5526SS024, a comparator and a timer are integrated in the motor control chip, and peripheral devices of the motor control chip include a sixteenth capacitor C16, a seventeenth capacitor C17, an eighteenth capacitor C18, a nineteenth capacitor C19, a fortieth resistor R40 and a fortieth resistor R41, one end of the sixteenth capacitor C16 is connected to an eighth pin of the motor control chip, one end of the fortieth resistor R40 and one end of the fortieth resistor R41 respectively, the other end of the sixteenth capacitor C16 is connected to one end of the seventeenth capacitor C17 and connected to GND, the other end of the seventeenth capacitor C17 is connected to the other end of the fortieth resistor R40, the other end of the fortieth resistor R41 and the ninth pin of the motor control chip respectively, one end of the eighteenth capacitor C18 is connected to a twentieth pin of the motor control chip and connected to GND, one end of the eighteenth capacitor C18 is connected to the seventeenth pin of the motor control chip and grounded, one end of the sixteenth capacitor C19 is connected to the sixteenth pin of the motor control chip and the other end of the nineteenth capacitor C19 is connected to GND, and the other end of the nineteenth capacitor C is connected to the output end of the motor control chip is connected to the output circuit.
The CMS32M55 series motor control chip adopted by the embodiment of the invention is a special high-end motor control chip, the main frequency of the chip is up to 64MHz, and the working voltage is 2.1V to 5.5V; providing 32kflashlmemory, 8ksram; up to 30 GPIOs; 6-channel enhanced PWM can output complementary PWM with controllable dead zone; a 12-bit low-speed ADC with a built-in sampling rate of 100Ksps and a 12-bit high-speed ADC with a built-in sampling rate of 1.2 Msps; a 2-channel high-performance operational amplifier, a 2-channel analog comparator and a 2-channel gain-adjustable programmable gain amplifier are arranged in the amplifier; the 32-bit hardware divider requires only 6 system clocks; 2 UART,1 SPI, 1I 2C are provided in the aspect of communication interface; the industrial standard design can work at-40 ℃ to-105 ℃; multiple drives (3P+3N, 6N) are integrated, and peripheral components and BOM cost of the scheme are reduced.
Specifically, as shown in fig. 4, the sense signal amplifying circuit includes:
a second capacitor C2, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a third capacitor C3, a twenty-seventh resistor R27, a fifth capacitor C5, a seventh resistor C7 and a first amplifier;
one end of the second capacitor C2 is connected with the positive pole end FGin+ of the induction coil of the motor, the other end of the second capacitor C2 is connected with one end of the fourth resistor R4, the other end of the fourth resistor R4 is respectively connected with one end of the fifth resistor R5, one end of the sixth resistor R6, a fourth pin of the motor control chip, one end of the third capacitor C3 and the positive input end of the first amplifier, the other end of the fifth resistor R5 is connected with the sixteenth pin of the motor control chip, and the other end of the sixth resistor R6 is connected with the other end of the third capacitor C3 and grounded GND; one end of a twenty-seventh resistor R7 is connected with a negative electrode end FGin-of an induction coil of the motor, the other end of the twenty-seventh resistor R27 is respectively connected with a negative input end of a first amplifier, a third pin of a motor control chip, one end of the seventh resistor R7 and one end of a fifth capacitor C5, the other end of the seventh resistor R7 and the other end of the fifth capacitor C5 are both connected with an output end of the first amplifier, and the output end of the first amplifier is connected with a second pin of the motor control chip.
Specifically, as shown in fig. 5, the embodiment of the invention further comprises a motor power supply circuit and a driving circuit;
the motor power supply circuit comprises a sixth capacitor C6, an eighth resistor R8, a ninth resistor R9, a seventh capacitor C7, an eighth capacitor C8, a voltage stabilizing diode TVS1, a fuse FU and an external connection port J1, wherein the external connection port J1 is provided with 5 pins;
the input end of the fuse FU is connected with a first pin of the external connection port J1, the output end of the fuse FU is respectively connected with the cathode of the voltage stabilizing diode TVS1, the anode of the eighth capacitor C8 and one end of the seventh capacitor C7, the other end of the seventh capacitor C7 is respectively connected with the cathode of the eighth capacitor C8 and the anode of the voltage stabilizing diode TVS1 and is grounded GND, and the anode of the voltage stabilizing diode TVS1 is connected with a second pin of the external connection port J1; one end of a sixth capacitor C6 is respectively connected with a twenty-fourth pin of the motor control chip, one end of an eighth resistor R8 and one end of a ninth resistor R9, the other end of the ninth resistor R9 is connected with a fourth pin of an external port J1, the other end of the eighth resistor R8 is connected with a twentieth pin of the motor control chip, and the other end of the sixth capacitor C6 is grounded GND;
the driving circuit comprises a first coupling capacitor AC1, a second coupling capacitor AC2, a third coupling capacitor AC3, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a first switching tube QB1, a second switching tube QB2 and a third switching tube QB3;
One end of the first coupling capacitor AC1 is respectively connected with one end of a twenty-second resistor R22, one end of a twenty-third resistor R23, one end of a sixteenth resistor R16, one end of a ninth resistor R17, the other end of the ninth resistor C9 and a first pin of the first switching tube QB1, the other end of the twenty-second resistor R22 is connected with the other end of the twenty-third resistor R23 and grounded GND, the other end of the first coupling capacitor AC1 is respectively connected with one end of a seventeenth resistor R17, one end of a tenth resistor C10 and a third pin of the first switching tube QB1, one end of the tenth resistor R10 is connected with a fifteenth pin of a motor control chip, the other end of the tenth resistor R10 is respectively connected with the other end of the sixteenth resistor R16, one end of the seventeenth resistor R17, the other end of the ninth resistor C9 and a second pin of the first switching tube QB1, one end of the eleventh resistor R11 is connected with a fourteenth pin of the motor control chip, the other end of the eleventh resistor R11 is connected with the seventeenth pin of the seventeenth resistor R17, the other end of the tenth resistor C10, the fourth pin of the fourth switching tube QB1 is connected with a seventh pin of the motor control chip, and the eighth pin of the eighth resistor is connected with the seventh pin of the motor control chip;
one end of the second coupling capacitor AC2 is respectively connected with one end of a twenty-second resistor R22, one end of a twenty-third resistor R23, one end of an eighteenth resistor R18, one end of an eleventh resistor R11 and a first pin of a second switching tube QB2, the other end of the second coupling capacitor AC2 is respectively connected with one end of a nineteenth resistor R9, one end of a twelfth resistor C12 and a third pin of the second switching tube QB2, one end of the twelfth resistor R12 is connected with a thirteenth pin of a motor control chip, the other end of the twelfth resistor R12 is respectively connected with the other end of the eighteenth resistor R18, one end of the nineteenth resistor R19, the other end of the eleventh resistor C11 and a second pin of the second switching tube QB2, one end of the thirteenth resistor R13 is connected with the other end of the nineteenth resistor R19, the other end of the twelfth resistor C12 and a fourth pin of the second switching tube QB2, and fifth, sixth and seventh pins of the eighth resistor and the eighth pin of the eighth resistor V are all connected with the eighth pin of the motor control chip;
One end of the third coupling capacitor AC3 is respectively connected with one end of the twenty-second resistor R22, one end of the twenty-third resistor R23, one end of the twenty-third resistor R20, one end of the thirteenth resistor C13 and a first pin of the third switching tube QB3, the other end of the third coupling capacitor AC3 is respectively connected with one end of the twenty-first resistor R21, one end of the fourteenth capacitor C14 and a third pin of the third switching tube QB3, one end of the fourteenth resistor R14 is connected with an eleventh pin of the motor control chip, the other end of the fourteenth resistor R14 is respectively connected with the other end of the twenty-first resistor R20, one end of the twenty-first resistor R21, the other end of the thirteenth capacitor C13 and a second pin of the third switching tube QB3, one end of the fifteenth resistor R15 is connected with a tenth pin of the motor control chip, the other end of the fourteenth resistor R21, a fourth pin of the third switching tube QB3, a fifth pin of the seventh pin of the third switching tube QB3, and a eighth pin of the motor.
Specifically, as shown in fig. 6, the embodiment of the present invention further includes a locking circuit;
the locking circuit comprises a twenty-fourth resistor R24, a twenty-fifth resistor R25 and a fifteenth capacitor C15;
One end of a twenty-fourth resistor R24 is connected with a third pin of the external connection port J1, the other end of the twenty-fourth resistor R24 is respectively connected with one end of a twenty-fifth resistor R25, one end of a fifteenth capacitor C15 and a twenty-first pin of a motor control chip, the other end of the twenty-fifth resistor R25 is connected with the twentieth pin of the motor control chip, and the other end of the fifteenth capacitor C15 is grounded.
Specifically, the embodiment of the invention also comprises an RC filter circuit;
the RC filter circuit comprises a fourth capacitor C4 and a twenty-sixth resistor R26;
one end of a fourth capacitor C4 is respectively connected with the output end of the first amplifier and the second pin of the motor control chip, the other end of the fourth capacitor C4 is connected with one end of a twenty-sixth resistor R26, and the other end of the twenty-sixth resistor R26 is connected with the twenty-third pin of the motor control chip.
Specifically, as shown in fig. 7, the embodiment of the invention further comprises a motor rotor position sensing circuit, a sampling signal amplifying circuit and a jumper resistor, wherein the motor rotor position sensing circuit is composed of a plurality of hall sensors and a matching circuit thereof; the output end of the motor rotor position sensing circuit is connected with a twenty-second pin of the motor control chip, the input end of the sampling signal amplifying circuit is connected with one end of a third coupling capacitor AC3 in the driving circuit, and the output end of the sampling signal amplifying circuit is connected with a fifth pin of the motor control chip.
In the embodiment of the present invention, as shown in fig. 7 (a), the motor rotor position sensing circuit includes a first HC capacitor HC1, a second HC capacitor HC2, a first HR resistor HR1, a second HR resistor HR2, a third HR resistor HR3, a fourth HR resistor HR4, a fifth HR resistor HR5, a sixth HR resistor HR6, a first hall sensor H1, a second hall sensor H2, and a third hall sensor H3, where one end of the first HC capacitor HC1 is connected to one end of the first HR resistor HR1, one end of the second HR resistor HR2, one end of the third HR resistor HR3, one end of the fourth HR resistor HR4, a first pin of the first hall sensor H1, a first pin of the second hall sensor H2, a first pin of the third hall sensor H3, and a sixteenth pin of the motor control chip are connected in parallel, and the other end of the first HC capacitor HC1 is connected to the third pin of the first hall sensor H1, the other end of the fourth HR resistor HR4 is connected to the second pin of the second HR2, the other end of the fourth HR resistor HR4 is connected to the other end of the second hall resistor HR2, and the other end of the fourth HC resistor HR4 is connected to the other end of the second pin of the fourth HR2, and the other end of the fourth HR resistor HR4 is connected to the other end of the fourth pin of the fourth HR resistor HR 2.
In an embodiment of the present invention, as shown in fig. 7 (b), a sampling signal amplifying circuit includes: the motor control circuit comprises a twenty eighth resistor R28, a twenty ninth resistor R29, a thirty resistor R30, a thirty first resistor R31, a thirty second resistor R32 and a second amplifier, wherein one end of the twenty eighth resistor R28 is connected with one end of a third coupling capacitor AC3 in the driving circuit, the other end of the twenty eighth resistor R28 is connected with one end of the twenty ninth resistor R29, one end of the thirty resistor R30, a seventh pin of a motor control chip and a positive input end of the second amplifier, the other end of the twenty ninth resistor R29 is grounded GND, the other end of the thirty resistor R30 is connected with a sixteenth pin of the motor control chip, one end of the thirty first resistor R31 is connected with ground GND, the other end of the thirty first resistor R31 is connected with a sixth pin of the motor control chip, a negative input end of the second amplifier and one end of the thirty second resistor R32, and the other end of the thirty second resistor R32 is connected with an output end of the second amplifier and connected with a fifth pin of the motor control chip.
As shown in fig. 7 (c), the embodiment of the present invention further includes a plurality of jumper resistors, such as a thirty third resistor R33, a thirty fourth resistor R34, a thirty fifth resistor R35, a thirty sixth resistor R36, a thirty seventh resistor R37, a thirty eighth resistor R38, and a thirty ninth resistor R39, where two ends of the thirty third resistor R33 and the thirty fourth resistor R34 are connected to one end of the twenty eighth resistor R28, and two ends of the thirty fifth resistor R35, the thirty sixth resistor R36, the thirty seventh resistor R37, the thirty eighth resistor R38, and the thirty ninth resistor R39 are grounded GND. The jumper resistor has the function of facilitating debugging on a PCB or being designed in a compatible way; the electric resistance can be used as a jumper wire, if a certain section of line is not used, the electric resistance is directly not attached, and the appearance is not influenced; when the parameters of the matching circuit are uncertain, 0 ohm is used for replacing the parameters, and when the actual debugging is carried out, the parameters are determined and then elements with specific values are used for replacing the parameters; if the current consumption of a certain part of the circuit is wanted to be measured, a certain resistor can be removed, and an ammeter is connected, so that the current consumption can be conveniently measured; in wiring, if wiring is difficult, a resistor of 0 ohm may be added.
As shown in fig. 8, the embodiment of the invention further provides a rotational speed correction method of a dc brushless outer rotor motor, which is applied to the rotational speed correction circuit of the dc brushless outer rotor motor, and includes:
step 1, a motor control chip obtains an externally input CLK signal through a signal input circuit and controls a motor to enter closed loop starting according to the CLK clock signal;
specifically, the CLK clock signal is a TTL level signal, and the signal frequency= (the rotation speed of the motor needs to be set/60) ×the pole pair number (unit Hz) of the secondary punching magnet.
Step 2, after the motor rotates, controlling a magnetic field induction coil on a main control circuit board to cut a magnetic field generated by secondary punching, and outputting induction signals at two ends of the induction coil of the motor;
step 3, the induction signal is amplified by an induction signal amplifying circuit and then is input into the positive end of a comparator in a motor control chip;
and 4, comparing the signal input into the positive end of the comparator with the voltage signal of the negative end of the comparator by the motor control chip to obtain a comparison result, and calculating to obtain the low-level time and the high-level time of the output signal of the comparator according to the comparison result.
Specifically, the motor control chip calculates the target rotating speed of the motor according to a calculating formula of the signal frequency, so that the motor enters a closed loop to start, the motor control chip adjusts the rotating speed of the motor through PID according to the difference value between the target rotating speed and the actual rotating speed of the motor after starting, and the PID (ProportionalIntegralDerivative) controller is a proportional-integral-derivative controller, and in industrial process control, the control system is abbreviated as PID according to the proportion, integral and derivative of errors generated by comparing the information acquired by real-time data of a controlled object with a given value.
Specifically, the negative terminal of the comparator in the motor control chip is set to be a fixed voltage, after a signal is input to the positive terminal of the comparator, the signal is compared with the negative terminal voltage, when the level of the input signal is greater than the level of the negative terminal voltage, the comparator outputs a high level, and when the level of the input signal is less than the level of the negative terminal voltage, the comparator outputs a low level, so that the induction signal is shaped into a square wave from a sine wave.
And 5, inputting the low-level time and the high-level time into a timer in the motor control chip, and counting by the timer to obtain the frequency of the induction signal.
Specifically, a timer in the motor control chip is set as a counter, the high level and the low level output by the comparator are calculated, the low level time and the high level time of the output signal of the comparator are obtained through calculation, and the period of the output signal of the comparator is equal to the low level time and the high level time.
In the embodiment of the invention, the induction coil corresponds to the pair of auxiliary magnetic pole pairs of the end face of the rotor, the length of the magnetic pole of the surface of the motor rotor corresponds to the distance between the coils, when the motor rotor rotates, a conductor on the coil cuts a magnetic field generated by the magnetic pole of the surface of the motor rotor, and an induced electromotive force is generated on the coils according to a right-hand rule; when the motor rotor rotates, output waveforms are generated at the two ends of the coil, and the number of waveforms output at the two ends of the coil is equal to the number of pairs of auxiliary magnetic poles after the motor rotates for one circle.
Step 6, comparing the frequency of the induction signal with the frequency of the CLK signal to obtain frequency deviation, and correcting the rotating speed of the motor in real time by using the frequency deviation;
when the frequency of the induction signal is larger than the frequency of the CLK signal, the motor rotating speed is overlarge, and the motor control chip regulates down the rotating speed of the motor according to the frequency difference value between the frequency of the induction signal and the frequency of the CLK signal;
when the frequency of the induction signal is smaller than the frequency of the CLK signal, the motor rotating speed is too small, and the motor control chip adjusts the rotating speed of the motor according to the frequency difference value between the frequency of the induction signal and the frequency of the CLK signal.
The rotating speed correcting circuit provided by the embodiment of the invention comprises a signal input circuit, an induction signal amplifying circuit and a motor control chip, wherein the motor control chip sets the rotating speed of a motor after reading the input signal of the signal input circuit, after the motor rotates normally, the induction signal is amplified by the induction signal amplifying circuit and then is input into the motor control chip to count the induction signal, the frequency of the induction signal is obtained, the frequency deviation of the frequency and the frequency of the input signal is equal to the deviation of a chip clock, the frequency deviation is used for correcting the frequency of the input signal in real time, the read frequency of the input signal is not influenced by factors such as a chip production process, temperature drift and the like, and therefore the stability and consistency of the output rotating speed of the motor are improved.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (4)
1. A method for correcting the rotational speed of a dc brushless external rotor motor, characterized in that the rotational speed correction circuit is applied to the dc brushless external rotor motor, the rotational speed correction circuit comprises: the device comprises a signal input circuit, an induction signal amplifying circuit, a motor control chip, a motor power supply circuit, a driving circuit and a locking circuit;
the output end of the signal input circuit is connected with the input end of the motor control chip, the output end of the motor control chip is electrically connected with the input end of the motor, the output end of the induction coil of the motor is connected with the input end of the induction signal amplification circuit, and the output end of the induction signal amplification circuit is connected with the input end of the motor control chip;
the motor control chip obtains a CLK signal through the signal input circuit, controls the motor to rotate through the CLK signal, and outputs induction signals at two ends of an induction coil of the motor;
The induction signal amplifying circuit amplifies the induction signal and inputs the amplified induction signal to the positive end of a comparator in the motor control chip;
the motor control chip compares a signal input into the positive end of the comparator with a voltage signal input into the negative end of the comparator to obtain a comparison result, and calculates low-level time and high-level time of an output signal of the comparator according to the comparison result; inputting the low-level time and the high-level time into a timer in the motor control chip, and counting by the timer to obtain the frequency of the induction signal; comparing the frequency of the induction signal with the frequency of the CLK signal to obtain frequency deviation, and correcting the rotating speed of the motor in real time by using the frequency deviation;
the signal input circuit includes:
the first resistor, the second resistor, the third resistor and the first capacitor;
one end of the first resistor is connected with a power supply, the other end of the first resistor is connected with one end of the second resistor and one end of the first capacitor respectively, the other end of the first capacitor is grounded, the other end of the second resistor is connected with one end of the third resistor and the input end of the motor control chip respectively, and the other end of the third resistor is grounded;
The sense signal amplifying circuit includes:
a second capacitor, a fourth resistor, a fifth resistor, a sixth resistor, a third capacitor, a twenty-seventh resistor, a fifth capacitor, a seventh resistor and a first amplifier;
one end of the second capacitor is connected with the positive electrode end of the induction coil of the motor, the other end of the second capacitor is connected with one end of the fourth resistor, the other end of the fourth resistor is respectively connected with one end of the fifth resistor, one end of the sixth resistor, a fourth pin of the motor control chip, one end of the third capacitor and the positive input end of the first amplifier, the other end of the fifth resistor is connected with a sixteenth pin of the motor control chip, and the other end of the sixth resistor is connected with the other end of the third capacitor and grounded;
one end of the twenty-seventh resistor is connected with the negative electrode end of the induction coil of the motor, the other end of the twenty-seventh resistor is respectively connected with the negative input end of the first amplifier, the third pin of the motor control chip, one end of the seventh resistor and one end of the fifth capacitor, the other end of the seventh resistor and the other end of the fifth capacitor are connected with the output end of the first amplifier, and the output end of the first amplifier is connected with the second pin of the motor control chip;
The motor power supply circuit comprises a sixth capacitor, an eighth resistor, a ninth resistor, a seventh capacitor, an eighth capacitor, a zener diode, a fuse and an external port;
the input end of the fuse is connected with the first pin of the external port, the output end of the fuse is respectively connected with the negative electrode of the voltage-stabilizing diode, the positive electrode of the eighth capacitor and one end of the seventh capacitor, the other end of the seventh capacitor is respectively connected with the negative electrode of the eighth capacitor and the positive electrode of the voltage-stabilizing diode and grounded, and the positive electrode of the voltage-stabilizing diode is connected with the second pin of the external port; one end of the sixth capacitor is connected with a twenty-fourth pin of the motor control chip, one end of the eighth resistor and one end of the ninth resistor respectively, the other end of the ninth resistor is connected with a fourth pin of the external port, the other end of the eighth resistor is connected with a twenty-fourth pin of the motor control chip, and the other end of the sixth capacitor is grounded;
the driving circuit comprises a first coupling capacitor, a second coupling capacitor, a third coupling capacitor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty first resistor, a twenty second resistor, a twenty third resistor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a first switching tube, a second switching tube and a third switching tube;
One end of the first coupling capacitor is respectively connected with one end of the twenty-second resistor, one end of the twenty-third resistor, one end of the sixteenth resistor, one end of the ninth resistor and a first pin of the first switching tube, the other end of the twenty-second resistor is connected with the other end of the twenty-third resistor and grounded, the other end of the first coupling capacitor is respectively connected with one end of the seventeenth resistor, one end of the tenth capacitor and a third pin of the first switching tube, one end of the tenth resistor is connected with a fifteenth pin of the motor control chip, the other end of the tenth resistor is respectively connected with the other end of the sixteenth resistor, the other end of the ninth capacitor and a second pin of the first switching tube, one end of the eleventh resistor is connected with a fourteenth pin of the motor control chip, the other end of the eleventh resistor is connected with the other end of the seventeenth resistor, the other end of the tenth capacitor and a fourth pin of the first switching tube, and the fifth pin of the motor control chip, and the eighth pin of the motor control chip are all connected with the eighth pin;
One end of the second coupling capacitor is respectively connected with one end of the twenty-second resistor, one end of the twenty-third resistor, one end of the eighteenth resistor, one end of the eleventh resistor and a first pin of the second switching tube, the other end of the second coupling capacitor is respectively connected with one end of the nineteenth resistor, one end of the twelfth capacitor and a third pin of the second switching tube, one end of the twelfth resistor is connected with a thirteenth pin of the motor control chip, the other end of the twelfth resistor is respectively connected with the other end of the eighteenth resistor, the other end of the eleventh capacitor and a second pin of the second switching tube, one end of the thirteenth resistor is connected with a twelfth pin of the motor control chip, the other end of the thirteenth resistor is connected with the other end of the nineteenth resistor, the other end of the twelfth resistor and a fourth pin of the second switching tube, and fifth pins, sixth pins and eighth pins of the second switching tube are all connected with V ends of the motor control chip;
one end of the third coupling capacitor is respectively connected with one end of the twenty-second resistor, one end of the twenty-third resistor, one end of the thirteenth capacitor and a first pin of the third switching tube, the other end of the third coupling capacitor is respectively connected with one end of the twenty-first resistor, one end of the fourteenth capacitor and a third pin of the third switching tube, one end of the fourteenth resistor is connected with an eleventh pin of the motor control chip, the other end of the fourteenth resistor is respectively connected with the other end of the twenty-first resistor, the other end of the thirteenth capacitor and a second pin of the third switching tube, one end of the fifteenth resistor is connected with a tenth pin of the motor control chip, the other end of the fifteenth resistor is connected with the other end of the twenty-first resistor, the other end of the fourteenth capacitor and a fourth pin of the third switching tube, and fifth, sixth and eighth pins of the third switching tube are all connected with a W end of the motor control chip;
The locking circuit comprises a twenty-fourth resistor, a twenty-fifth resistor and a fifteenth capacitor;
one end of the twenty-fourth resistor is connected with a third pin of the external port, the other end of the twenty-fourth resistor is respectively connected with one end of the twenty-fifth resistor, one end of the fifteenth capacitor and a twenty-first pin of the motor control chip, the other end of the twenty-fifth resistor is connected with a twentieth pin of the motor control chip, and the other end of the fifteenth capacitor is grounded;
the rotational speed correction method comprises the following steps:
step 1, a motor control chip obtains an externally input CLK signal through a signal input circuit and controls a motor to enter closed loop starting according to the CLK signal;
step 2, after the motor rotates, controlling a magnetic field induction coil on a main control circuit board to cut a magnetic field generated by secondary magnetic punching, and outputting induction signals at two ends of the induction coil;
step 3, the induction signal is amplified by the induction signal amplifying circuit and then is input into the positive end of a comparator in the motor control chip;
step 4, the motor control chip compares the signal input into the positive end of the comparator with the voltage signal of the negative end of the comparator, when the level of the input signal is greater than the level of the voltage of the negative end, the comparator outputs a high level, when the level of the input signal is less than the level of the voltage of the negative end, the comparator outputs a low level, and the low level time and the high level time of the output signal of the comparator are calculated;
Step 5, inputting the low-level time and the high-level time into a timer in the motor control chip, and counting by the timer to obtain the frequency of the induction signal;
step 6, comparing the frequency of the induction signal with the frequency of the CLK signal to obtain frequency deviation, and correcting the rotating speed of the motor in real time by using the frequency deviation;
when the frequency of the induction signal is larger than the frequency of the CLK signal, the motor rotating speed is overlarge, and the motor control chip regulates down the rotating speed of the motor according to the frequency difference value between the frequency of the induction signal and the frequency of the CLK signal;
when the frequency of the induction signal is smaller than the frequency of the CLK signal, the motor rotating speed is too small, and the motor control chip adjusts the rotating speed of the motor according to the frequency difference value between the frequency of the induction signal and the frequency of the CLK signal.
2. The method for correcting the rotation speed of the direct current brushless outer rotor motor according to claim 1, wherein the motor control chip is of a type CMS32M5526SS024, a comparator and a timer are integrated in the motor control chip, a first pin of the motor control chip is connected with the other end of the second resistor, and a second pin of the motor control chip is connected with the output end of the induction signal amplifying circuit.
3. The method for correcting the rotational speed of a direct current brushless outer rotor motor according to claim 2, further comprising an RC filter circuit;
the RC filter circuit comprises a fourth capacitor and a twenty-sixth resistor;
one end of the fourth capacitor is connected with the output end of the first amplifier and the second pin of the motor control chip respectively, the other end of the fourth capacitor is connected with one end of the twenty-sixth resistor, and the other end of the twenty-sixth resistor is connected with the twenty-third pin of the motor control chip.
4. The method for correcting the rotational speed of a direct current brushless outer rotor motor according to claim 3, further comprising a motor rotor position sensing circuit consisting of a plurality of hall sensors and a matching circuit thereof; and the output end of the motor rotor position sensing circuit is connected with a twenty-second pin of the motor control chip.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2804149A1 (en) * | 1978-01-31 | 1979-08-02 | Mfe Corp | Drive for magnetic discs - has external-rotor motor and speed control circuit with tachometer |
| CN1191412A (en) * | 1997-02-17 | 1998-08-26 | 三协精机制作所株式会社 | Motor speed controlling device |
| JPH10271874A (en) * | 1997-01-24 | 1998-10-09 | Aichi Electric Co Ltd | Driving circuit for brushless motor |
| JP2001061289A (en) * | 1999-06-14 | 2001-03-06 | Teac Corp | Device for forming speed control signal of motor |
| CN113014153A (en) * | 2021-02-08 | 2021-06-22 | 塞卡尔（北京）工业技术有限公司 | Control system, method and device of three-phase brushless direct current motor |
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2022
- 2022-12-21 CN CN202211648449.XA patent/CN115864906B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2804149A1 (en) * | 1978-01-31 | 1979-08-02 | Mfe Corp | Drive for magnetic discs - has external-rotor motor and speed control circuit with tachometer |
| JPH10271874A (en) * | 1997-01-24 | 1998-10-09 | Aichi Electric Co Ltd | Driving circuit for brushless motor |
| CN1191412A (en) * | 1997-02-17 | 1998-08-26 | 三协精机制作所株式会社 | Motor speed controlling device |
| JP2001061289A (en) * | 1999-06-14 | 2001-03-06 | Teac Corp | Device for forming speed control signal of motor |
| CN113014153A (en) * | 2021-02-08 | 2021-06-22 | 塞卡尔（北京）工业技术有限公司 | Control system, method and device of three-phase brushless direct current motor |
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