CN117294189A - BLDC low-speed measuring circuit based on speed measuring motor - Google Patents
BLDC low-speed measuring circuit based on speed measuring motor Download PDFInfo
- Publication number
- CN117294189A CN117294189A CN202311144771.3A CN202311144771A CN117294189A CN 117294189 A CN117294189 A CN 117294189A CN 202311144771 A CN202311144771 A CN 202311144771A CN 117294189 A CN117294189 A CN 117294189A
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- China
- Prior art keywords
- operational amplifier
- circuit
- electrically connected
- input end
- output end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000001914 filtration Methods 0.000 claims abstract description 38
- 238000005259 measurement Methods 0.000 claims abstract description 13
- 230000002457 bidirectional effect Effects 0.000 claims description 25
- 230000000087 stabilizing effect Effects 0.000 claims description 17
- 239000003990 capacitor Substances 0.000 claims description 12
- 238000010586 diagram Methods 0.000 description 5
- 230000003321 amplification Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
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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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/06—Arrangements for speed regulation of a single motor wherein the motor speed is measured and compared with a given physical value so as to adjust the motor speed
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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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
- H02P6/17—Circuit arrangements for detecting position and for generating speed information
-
- 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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/30—Arrangements for controlling the direction of rotation
Abstract
The invention discloses a BLDC low-speed measurement circuit based on a speed measurement motor, which comprises a first amplifying circuit, a second filtering protection circuit, a third voltage lifting circuit and a following filtering circuit, wherein the output end of the first amplifying circuit is electrically connected with the input end of the second filtering protection circuit, the output end of the second filtering protection circuit is electrically connected with the input end of the third voltage lifting circuit, and the output end of the third voltage lifting circuit is electrically connected with the following filtering circuit, so that the problem of BLDC low-speed control of the speed measurement motor and a Hall feedback form is effectively solved.
Description
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a BLDC low-speed measuring circuit based on a speed measuring motor.
Background
In the prior art, the HALL sensor is used for judging the position of the rotor and judging the steering, the speed measuring motor is used for obtaining the absolute value of the rotating speed after rectification, the principle is that the steering is judged through the transformation of the HALL position, and meanwhile, the actual rotating speed of the motor is obtained by combining the signals after the speed measuring motor is rectified. The scheme has no change in the HALL position, but when the actual rotation speed changes direction, the error of the direction judgment of the rotation speed is caused. Therefore, the method is only suitable for medium and high speed control, and the rotation speed change is required to be carried out by open loop.
Aiming at the feedback form of the BLDC speed measuring motor and the position Hall, the prior art can only control the motor to run at medium and high speed, and when the speed is low, especially near zero speed, the rotating speed direction can not be judged and identified in time when the rotating speed is switched between positive and negative, so that normal closed-loop control can not be performed.
Disclosure of Invention
In order to solve the technical problems, the invention provides a BLDC low-speed measuring circuit based on a speed measuring motor, which aims to solve the problems of low rotating speed and forward and reverse rotation switching of a feedback form of the BLDC speed measuring motor and a position Hall.
The specific scheme is as follows:
the BLDC low-speed measurement circuit based on the speed measurement motor comprises a first amplifying circuit, a second filtering protection circuit, a third voltage lifting circuit and a following filtering circuit, wherein the output end of the first amplifying circuit is electrically connected with the input end of the second filtering protection circuit, the output end of the second filtering protection circuit is electrically connected with the input end of the third voltage lifting circuit, and the output end of the third voltage lifting circuit is electrically connected with the following filtering circuit.
The first amplifying circuit comprises a first operational amplifier, a positive phase input end of the first operational amplifier, a negative phase input end of the first operational amplifier and an output end of the first operational amplifier are arranged on the first operational amplifier, a first proportional amplifying resistor and a first bidirectional voltage stabilizing tube are arranged on the negative phase input end of the first operational amplifier, the first proportional amplifying resistor is electrically connected with the negative phase input end of the first operational amplifier, one end of the first bidirectional voltage stabilizing tube is electrically connected with the negative phase input end of the first operational amplifier, the other end of the first bidirectional voltage stabilizing tube is electrically connected with a power supply, a second proportional amplifying resistor, a third proportional amplifying resistor and a second bidirectional voltage stabilizing tube are arranged on the positive phase input end of the first operational amplifier, the second proportional amplifying resistor is electrically connected with a power supply ground after being connected in series, one end of the second bidirectional voltage stabilizing tube is electrically connected with the positive phase input end of the first operational amplifier, and the other end of the second bidirectional voltage stabilizing tube is electrically connected with the first voltage stabilizing tube, and the other end of the second proportional amplifying resistor is electrically connected with the first voltage stabilizing tube.
The second filtering protection circuit is a low-pass RC filtering circuit, the low-pass RC filtering circuit comprises a filtering resistor, a filtering capacitor and a third bidirectional voltage stabilizing tube, the filtering resistor is connected with the power ground after being connected with the filtering capacitor in series, and the filtering resistor is also connected with the power ground after being connected with the third bidirectional voltage stabilizing tube in series.
The third voltage lifting circuit comprises a second operational amplifier, wherein the second operational amplifier is provided with a normal phase input end of the second operational amplifier, an inverted phase input end of the second operational amplifier and an output end of the second operational amplifier, the normal phase input end of the second operational amplifier is electrically connected with the second filter protection circuit, the inverted phase input end of the second operational amplifier is electrically connected with the output end of the second operational amplifier, the output end of the second operational amplifier is provided with a first voltage dividing resistor, a second voltage dividing resistor, a third voltage dividing resistor and a reference filter capacitor, one end of the first voltage dividing resistor is electrically connected with the output end of the second operational amplifier, the other end of the second voltage dividing resistor is connected with the second voltage dividing resistor in series and then is grounded, the second voltage dividing resistor is connected with a reference power supply in series and then is electrically connected with the reference power supply through the reference filter capacitor.
The following filter circuit comprises a third operational amplifier and a fourth operational amplifier, wherein the positive-phase input end of the third operational amplifier is electrically connected with the third lifting circuit, the negative-phase input end of the third operational amplifier is electrically connected with the output end of the third operational amplifier, the output end of the third operational amplifier is provided with a first RC filter circuit, the output end of the third operational amplifier is electrically connected with the positive-phase input end of the fourth operational amplifier through the first RC filter circuit, the negative-phase input end of the fourth operational amplifier is electrically connected with the output end of the fourth operational amplifier, the output end of the fourth operational amplifier is provided with a second RC filter circuit and a protection diode, and the output end of the fourth operational amplifier is sequentially electrically connected with the second RC filter circuit and the protection diode.
The invention discloses a BLDC low-speed measuring circuit based on a speed measuring motor, when the rotating speed is near zero, the counter electromotive force of the speed measuring motor is very weak, differential signal amplification and filtering are adopted, line voltage is obtained through a differential amplification method, but noise interference is amplified simultaneously after the signal is amplified by operational amplification, so that a proper filtering circuit is selected for further processing the signal, and a useful line voltage signal can be obtained; the micro signal processing circuit adopted by the invention can identify weak counter electromotive force of the speed measuring motor at low speed, can realize the rotation speed control of BLDC at least 0.5RPM, and effectively solves the problem of BLDC low-speed control of the speed measuring motor and a Hall feedback mode.
Drawings
Fig. 1 is a schematic diagram of the circuit principle of the present invention.
Fig. 2 is a schematic circuit diagram of the first amplifying circuit.
Fig. 3 is a schematic circuit diagram of a second filter protection circuit.
Fig. 4 is a schematic circuit diagram of a third voltage raising circuit.
Fig. 5 is a schematic diagram of the circuit principle of the following filter circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. It will be apparent to those skilled in the art that the described embodiments are only a part, but not all, of the implementations of the invention, and that all other embodiments, based on which those skilled in the art will come to lie within the scope of the invention without making any inventive effort.
As shown in fig. 1, a BLDC low-speed measurement circuit based on a speed measurement motor includes a first amplifying circuit 201, a second filtering protection circuit 202, a third voltage raising circuit 203 and a following filtering circuit 204, wherein an output end of the first amplifying circuit 201 is electrically connected with an input end of the second filtering protection circuit 202, an output end of the second filtering protection circuit 202 is electrically connected with an input end of the third voltage raising circuit 203, and an output end of the third voltage raising circuit 203 is electrically connected with the following filtering circuit 204.
The first amplifying circuit 201 is used for amplifying the collected signal, when the motor operates at the rotation speed of about 0, the counter electromotive force of the tacho motor is very small, only a few mV, and the signal-to-noise ratio is low when the signal is directly sampled. Therefore, the counter electromotive force signal of the tachometer motor needs to be amplified, and effective rotating speed information at low rotating speed can be better distinguished.
The signal amplified by the first amplifying circuit 201 is also amplified, so that a low-pass filter is required to remove the noise, and the bidirectional voltage regulator is used to prevent the damage to the subsequent circuit caused by the abnormal high voltage, and the second filter protection circuit 202 is used to remove the noise.
The counter electromotive force signal of the tacho motor is a sine-like signal, and the ADC sampling of the DSP can only perform voltage acquisition of 0-3 v, so that the signal needs to be subjected to voltage boosting processing to reach the sampling voltage range, and the third voltage boosting circuit 203 is used for boosting the motor signal.
Before the DSP samples, the fourth follower filter circuit 204 buffers the signal, filters out the high frequency noise interference again, and simultaneously uses the diode to perform voltage clipping to prevent the abnormal high voltage from damaging the DSP.
As shown in fig. 2, the first amplifying circuit 201 includes a first operational amplifier, a positive phase input end of the first operational amplifier, a negative phase input end of the first operational amplifier, and an output end of the first operational amplifier are disposed on the first operational amplifier, a first proportional amplifying resistor R2 and a first bidirectional voltage regulator D1 are disposed on the negative phase input end of the first operational amplifier, the first proportional amplifying resistor R2 is electrically connected with the negative phase input end of the first operational amplifier, one end of the first bidirectional voltage regulator D1 is electrically connected with the negative phase input end of the first operational amplifier, the other end of the first bidirectional voltage regulator D1 is electrically connected with a power supply, a second proportional amplifying resistor R9, a third proportional amplifying resistor R11, and a second bidirectional voltage regulator D3 are disposed on the positive phase input end of the first operational amplifier, the second proportional amplifying resistor R9 is connected in series with the third proportional amplifying resistor R11, and then is electrically connected with the power supply ground, one end of the second proportional amplifying resistor R9 is also electrically connected with the negative phase input end of the second operational amplifier, the other end of the second bidirectional voltage regulator D is electrically connected with the first bidirectional voltage regulator D3, and the other end of the second bidirectional voltage regulator is electrically connected with the first input end of the second operational amplifier.
As shown in fig. 3, the second filter protection circuit 202 is a low-pass RC filter circuit, and the low-pass RC filter circuit includes a filter resistor R8, a filter capacitor C9, and a third bidirectional voltage regulator D2, where the filter resistor R8 is connected in series with the filter capacitor C9 and then connected to the power ground, and the filter resistor R8 is also connected in series with the third bidirectional voltage regulator D2 and then connected to the power ground.
As shown in fig. 4, the third voltage raising circuit 203 includes a second operational amplifier, a normal phase input end of the second operational amplifier, an inverted phase input end of the second operational amplifier, and an output end of the second operational amplifier are disposed on the second operational amplifier, the normal phase input end of the second operational amplifier is electrically connected to the second filter protection circuit 202, the inverted phase input end of the second operational amplifier is electrically connected to the output end of the second operational amplifier, a first voltage dividing resistor R7, a second voltage dividing resistor R10, a third voltage dividing resistor R3, and a reference filter capacitor C9 are disposed on the output end of the second operational amplifier, one end of the first voltage dividing resistor R7 is electrically connected to the output end of the second operational amplifier, the other end of the first voltage dividing resistor R7 is connected to the second voltage dividing resistor R10 in series, then is grounded, and the second voltage dividing resistor R10 and the third voltage dividing resistor R3 are connected in series and then connected to the reference power supply, and the reference power supply is electrically connected to the power supply through the reference filter capacitor C9.
As shown in fig. 5, the following filter circuit 204 includes a third operational amplifier and a fourth operational amplifier, the positive input end of the third operational amplifier is electrically connected to the third lifting circuit 203, the negative input end of the third operational amplifier is electrically connected to the output end of the third operational amplifier, the output end of the third operational amplifier is provided with a first RC filter circuit, the output end of the third operational amplifier is electrically connected to the positive input end of the fourth operational amplifier through the first RC filter circuit, the negative input end of the fourth operational amplifier is electrically connected to the output end of the fourth operational amplifier, the output end of the fourth operational amplifier is provided with a second RC filter circuit and a protection diode U56, and the output end of the fourth operational amplifier is sequentially electrically connected to the second RC filter circuit and the protection diode U56.
The BLDC low-speed measuring circuit based on the speed measuring motor comprises the following specific working processes:
any two-phase output signals of the rapid-detection motor, such as A phase and B phase, pass through a first differential amplifying circuit 201, then pass through a filter protection circuit 202 to remove medium-high frequency harmonic waves, then pass through a circuit 203 to carry out voltage lifting treatment on the signals, raise line voltage to positive voltage, finally pass through a following filter circuit 204 to carry out signal buffering, remove the higher harmonic waves, and enter the ADC (analog-to-digital converter) sampling of the DSP.
Similarly, the two paths of voltage signals U1AB and U1AC of the tachometer motor can be obtained by carrying out the same processing on the other two phases (phase A and phase C).
The other set of line voltages U2AB and U2BC can be obtained by processing AB and BC with another set of circuits having exactly the same principle but a greater amplification. The U2AB and the U2BC with larger magnification are used for calculating the rotating speed when the ultra-low rotating speed is operated, the U1AB and the U1BC are used for measuring the middle and low rotating speeds, and the other rotating speeds still use the mode of matching the HALL with the speed measuring motor.
The technical means disclosed by the scheme of the invention is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (5)
1. A BLDC low-speed measurement circuit based on a speed measurement motor is characterized in that: the circuit comprises a first amplifying circuit (201), a second filtering protection circuit (202), a third voltage raising circuit (203) and a following filtering circuit (204), wherein the output end of the first amplifying circuit (201) is electrically connected with the input end of the second filtering protection circuit (202), the output end of the second filtering protection circuit (202) is electrically connected with the input end of the third voltage raising circuit (203), and the output end of the third voltage raising circuit (203) is electrically connected with the following filtering circuit (204).
2. The tachometer motor based BLDC low speed measurement circuit of claim 1, wherein: the first amplifying circuit (201) comprises a first operational amplifier, a positive phase input end of the first operational amplifier, a negative phase input end of the first operational amplifier and an output end of the first operational amplifier are arranged on the first operational amplifier, a first proportional amplifying resistor (R2) and a first bidirectional voltage stabilizing tube (D1) are arranged on the negative phase input end of the first operational amplifier, the first proportional amplifying resistor (R2) is electrically connected with the negative phase input end of the first operational amplifier, one end of the first bidirectional voltage stabilizing tube (D1) is electrically connected with the negative phase input end of the first operational amplifier, the other end of the first bidirectional voltage stabilizing tube (D1) is electrically connected with a power supply, a second proportional amplifying resistor (R9), a third proportional amplifying resistor (R11) and a second bidirectional voltage stabilizing tube (D3) are arranged on the positive phase input end of the first operational amplifier, the second proportional amplifying resistor (R9) and the third proportional amplifying resistor (R11) are connected in series and then are electrically connected with the power supply, and one end of the second proportional amplifying resistor (R9) is electrically connected with the second input end of the second bidirectional voltage stabilizing tube (D3).
3. The tachometer motor based BLDC low speed measurement circuit of claim 1, wherein: the second filtering protection circuit (202) is a low-pass RC filtering circuit, the low-pass RC filtering circuit comprises a filtering resistor (R8), a filtering capacitor (C9) and a third bidirectional voltage stabilizing tube (D2), the filtering resistor (R8) is connected with the power ground after being connected with the filtering capacitor (C9) in series, and the filtering resistor (R8) is also connected with the power ground after being connected with the third bidirectional voltage stabilizing tube (D2) in series.
4. The tachometer motor based BLDC low speed measurement circuit of claim 1, wherein: the third voltage raising circuit (203) comprises a second operational amplifier, a normal phase input end of the second operational amplifier, an opposite phase input end of the second operational amplifier and an output end of the second operational amplifier are arranged on the second operational amplifier, the normal phase input end of the second operational amplifier is electrically connected with the second filter protection circuit (202), the opposite phase input end of the second operational amplifier is electrically connected with the output end of the second operational amplifier, a first voltage dividing resistor (R7), a second voltage dividing resistor (R10), a third voltage dividing resistor (R3) and a reference filter capacitor (C9) are arranged on the output end of the second operational amplifier, one end of the first voltage dividing resistor (R7) is electrically connected with the output end of the second operational amplifier, the other end of the first voltage dividing resistor (R7) is connected with the second voltage dividing resistor (R10) in series and then grounded, the second voltage dividing resistor (R10) and the third voltage dividing resistor (R3) are connected in series and then connected with the reference power supply, and the reference power supply is connected with the reference power supply through the reference filter capacitor (C9) in series.
5. The tachometer motor based BLDC low speed measurement circuit of claim 1, wherein: the following filter circuit (204) comprises a third operational amplifier and a fourth operational amplifier, wherein the positive input end of the third operational amplifier is electrically connected with a third lifting circuit (203), the negative input end of the third operational amplifier is electrically connected with the output end of the third operational amplifier, the output end of the third operational amplifier is provided with a first RC filter circuit, the output end of the third operational amplifier is electrically connected with the positive input end of the fourth operational amplifier through the first RC filter circuit, the negative input end of the fourth operational amplifier is electrically connected with the output end of the fourth operational amplifier, the output end of the fourth operational amplifier is provided with a second RC filter circuit and a protection diode (U56), and the output end of the fourth operational amplifier is sequentially electrically connected with the second RC filter circuit and the protection diode (U56).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311144771.3A CN117294189A (en) | 2023-09-06 | 2023-09-06 | BLDC low-speed measuring circuit based on speed measuring motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311144771.3A CN117294189A (en) | 2023-09-06 | 2023-09-06 | BLDC low-speed measuring circuit based on speed measuring motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117294189A true CN117294189A (en) | 2023-12-26 |
Family
ID=89250882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311144771.3A Pending CN117294189A (en) | 2023-09-06 | 2023-09-06 | BLDC low-speed measuring circuit based on speed measuring motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117294189A (en) |
-
2023
- 2023-09-06 CN CN202311144771.3A patent/CN117294189A/en active Pending
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