CN104113260A - Air conditioner, AC asynchronous motor control circuit and method - Google Patents
Air conditioner, AC asynchronous motor control circuit and method Download PDFInfo
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- 238000005070 sampling Methods 0.000 claims abstract description 15
- 230000006698 induction Effects 0.000 claims description 87
- 239000003990 capacitor Substances 0.000 claims description 19
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 12
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- 239000010703 silicon Substances 0.000 claims description 12
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- 238000013507 mapping Methods 0.000 claims description 5
- 230000033228 biological regulation Effects 0.000 description 2
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Abstract
The invention belongs to the technical field of motor control, and provides an air conditioner, an AC asynchronous motor control circuit and a method. The AC asynchronous motor control circuit provided by the invention comprises a current sampling module, a voltage feedback module, a main controller, a driving module and a chopper module. The circuit structure is simple, and the cost is low. The current sampling module samples stator currents of an AC asynchronous motor and outputs sampling currents to obtain corresponding sampling voltages through the voltage feedback module, the main controller obtains a chopper control angle from a preset database according to the sampling voltages and outputs corresponding driving signals to the driving module according to the chopper control angle, and the driving module, according to the driving signals, enables the chopper module to adjust the stator voltages of the AC asynchronous motor according to the chopper control angle so as to enable the AC asynchronous motor to run according to a rotation speed corresponding to the stator voltages, such that high-precision stepless speed control for the AC asynchronous motor can be realized.
Description
Technical field
The invention belongs to electric machines control technology field, relate in particular to a kind of air conditioner and AC induction motor control circuit and method.
Background technology
In AC induction motor operation process, its rotating speed is subject to the impact of load larger, and load greatly rotating speed is low, and the little rotating speed of load is high.At present, in the prior art, on domestic air conditioning, be PG (pulse generator for driving the AC induction motor of axial-flow fan, pulse generator) motor, on rotor, there is the magnet of 6 pairs of utmost points, on motor stator, be provided with Hall element, detect motor speed by Hall element, and then rotary speed detecting signal is fed back to main control chip, the finally driving signal to AC induction motor by main control chip adjustment, to reach the object of stabilized (steady-state) speed or adjustment rotating speed.Although above-mentioned prior art has advantages of that motor speed control precision is high, but because motor internal need to increase connecting line and the connecting line terminal between rotor magnet, Hall element circuit, motor and PCB circuit board, so improved motor cost, cannot realize high-precision rotating speed control to motor in situation cheaply.
Summary of the invention
The object of the present invention is to provide a kind of AC induction motor control circuit, be intended to solve the existing problem that cannot realize the control of high accuracy rotating speed in situation cheaply to motor of prior art.
The present invention is achieved in that a kind of AC induction motor control circuit, is connected with AC induction motor, and described AC induction motor control circuit comprises:
Current sample module, Voltage Feedback module, master controller, driver module and copped wave module;
The first sampling end of described current sample module is all connected described AC induction motor with the second sampling end, the zero line side of described current sample module connects alternating current zero line, the first input end of described Voltage Feedback module and the second input are connected respectively the first output and second output of described current sample module, the output of described Voltage Feedback module connects described master controller, described master controller also connects the controlled end of described driver module, the drive end of described driver module connects the copped wave controlled end of described copped wave module, the live wire end of described copped wave module is connected respectively alternating current fire wire and described AC induction motor with output,
Described current sample module is sampled to the stator current of described AC induction motor, and export sample rate current to described Voltage Feedback module, described Voltage Feedback module generates corresponding sampled voltage according to described sample rate current, and described sampled voltage is fed back to described master controller, described master controller obtains copped wave pilot angle according to described sampled voltage from presetting database, and according to the corresponding extremely described driver module of signal that drives of described copped wave pilot angle output, described driver module makes described copped wave module adjust the stator voltage of described AC induction motor according to described copped wave pilot angle according to described driving signal, so that described AC induction motor turns round according to the rotating speed corresponding with described stator voltage.
Another object of the present invention is also to provide a kind of air conditioner, and it comprises AC induction motor and above-mentioned AC induction motor control circuit.
Another object of the present invention is also to provide a kind of AC induction motor control method based on above-mentioned AC induction motor control circuit, and it comprises the following steps:
Current sample module is sampled to the stator current of described AC induction motor, and exports sample rate current to Voltage Feedback module;
Described Voltage Feedback module generates corresponding sampled voltage according to described sample rate current, and described sampled voltage is fed back to master controller;
Described master controller obtains copped wave pilot angle according to described sampled voltage from presetting database, and drives accordingly signal to driver module according to described copped wave pilot angle output;
Described driver module makes copped wave module adjust the stator voltage of described AC induction motor according to described copped wave pilot angle according to described driving signal, so that described AC induction motor turns round according to the rotating speed corresponding with described stator voltage.
The invention provides the AC induction motor control circuit that comprises current sample module, Voltage Feedback module, master controller, driver module and copped wave module, its circuit structure is simple and cost is low, by current sample module, the stator current of AC induction motor is sampled, and export sample rate current to Voltage Feedback module, Voltage Feedback module generates corresponding sampled voltage according to this sample rate current, and this sampled voltage is fed back to master controller, master controller obtains copped wave pilot angle according to described sampled voltage from presetting database, and drive accordingly signal to driver module according to this copped wave pilot angle output, driver module makes copped wave module adjust the stator voltage of AC induction motor according to described copped wave pilot angle according to this driving signal, so that AC induction motor turns round according to the rotating speed corresponding with this stator voltage, thereby can realize high-precision stepless speed regulation to AC induction motor, solve the existing problem that cannot realize high accuracy rotating speed control in situation cheaply to motor of prior art.
Brief description of the drawings
Fig. 1 is the modular structure figure of the AC induction motor control circuit that provides of the embodiment of the present invention;
Fig. 2 is the realization flow figure of the AC induction motor control method that provides of the embodiment of the present invention;
Fig. 3 is the exemplary circuit structure chart of the AC induction motor control circuit that provides of the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
With the example that is applied as in air conditioner, the AC induction motor control circuit that the embodiment of the present invention is provided describes below:
Air conditioner comprises AC induction motor and AC induction motor control circuit.Fig. 1 shows the modular structure of AC induction motor control circuit, for convenience of explanation, only shows the part relevant to the embodiment of the present invention, and details are as follows:
AC induction motor control circuit 100 is connected with AC induction motor 200, and AC induction motor control circuit 100 comprises current sample module 101, Voltage Feedback module 102, master controller 103, driver module 104 and copped wave module 105.
The first sampling end of current sample module 101 is all connected AC induction motor 200 with the second sampling end, the zero line side of current sample module 101 connects alternating current zero line N, the first input end of Voltage Feedback module 102 and the second input are connected respectively the first output and second output of current sample module 101, the output of Voltage Feedback module 102 connects master controller 103, master controller 103 also connects the controlled end of driver module 104, the drive end of driver module 104 connects the copped wave controlled end of copped wave module 105, the live wire end of copped wave module 105 is connected respectively alternating current fire wire L and AC induction motor 200 with output.
Current sample module 101 is sampled to the stator current of AC induction motor 200, and export sample rate current to Voltage Feedback module 102, Voltage Feedback module 102 generates corresponding sampled voltage according to this sample rate current, and this sampled voltage is fed back to master controller 103, master controller 103 obtains copped wave pilot angle according to this sampled voltage from presetting database, and drive accordingly signal to driver module 104 according to this copped wave pilot angle output, driver module 104 makes copped wave module 105 adjust the stator voltage of AC induction motor 200 according to above-mentioned copped wave pilot angle according to this driving signal, so that AC induction motor 200 turns round according to the rotating speed corresponding with described stator voltage.
AC induction motor control circuit 100 based on above-mentioned, the embodiment of the present invention also provides a kind of AC induction motor control method, and as shown in Figure 2, it comprises the following steps:
S1. current sample module 101 is sampled to the stator current of AC induction motor 200, and exports sample rate current to Voltage Feedback module 102;
S2. Voltage Feedback module 102 generates corresponding sampled voltage according to sample rate current, and this sampled voltage is fed back to master controller 103;
S3. master controller 103 obtains copped wave pilot angle from presetting database according to sampled voltage, and drives accordingly signal to driver module 104 according to this copped wave pilot angle output;
S4. driver module 104 is according to driving signal to make copped wave module 105 adjust the stator voltage of AC induction motor 200 according to described copped wave pilot angle, so that AC induction motor 200 turns round according to the rotating speed corresponding with this stator voltage.
It should be noted that, above-mentioned driving signal is that duty ratio is the pulse signal of α/π, and α is above-mentioned copped wave pilot angle, and π is circumference ratio.
For AC induction motor, its power output P and rotation speed n relation in direct ratio, that is: P ∝ n
3, can be designated as P=K × n
3.Motor torque T becomes positive quadratic relationship, that is: T=C × Uo with stator voltage Uo
2/ f × R
h, wherein C=magnetic pole logarithm × number of phases × number of turn, R
hfor rotor resistance and leakage reactance sum, hence one can see that, and the pass of motor torque T and stator voltage Uo is T ∝ Uo
2.The pass of motor torque T and power output P and rotation speed n is T=9550*P/n, in conjunction with P=K × n
3, the pass that can obtain motor torque and rotation speed n is T ∝ n
2, then in conjunction with T ∝ Uo
2, just known rotation speed n and stator voltage Uo are also proportional.And due to stator current I=Uo/R
d, R
dfor stator impedance, be a constant, so n ∝ Uo ∝ I, therefore, rotation speed n is higher, and stator voltage Uo and stator current I are also just larger, and vice versa.
In embodiments of the present invention, the stator voltage Uo of AC induction motor carries out copped wave according to copped wave pilot angle α to AC-input voltage by the optocoupler controllable silicon in copped wave module 105 to obtain, and the relation of stator voltage Uo and copped wave pilot angle α is shown below:
Wherein, the effective value that Ui is AC-input voltage, 0< α < π, α is larger, and Uo is less.Therefore, the sampled voltage feeding back according to Voltage Feedback module 102 by master controller 103 obtains copped wave pilot angle α from presetting database, and the pulse signal that output duty cycle is α/π is to driver module 104, control copped wave module 105 by driver module 104 again and adjust stator voltage Uo according to copped wave pilot angle α, thereby the rotating speed of AC induction motor 200 is adjusted accordingly according to stator voltage Uo.So, for above-mentioned mentioned presetting database, it is actually and has comprised rotation speed n, stator voltage Uo, copped wave pilot angle α, the mapping relations database of sample rate current I and sampled voltage U, be different stator voltage Uo corresponding to rotation speed n, copped wave pilot angle α, sample rate current I and sampled voltage U, many groups mapping relations are formed, data in this presetting database are by advance AC induction motor 200 being carried out to parameter detecting, and be arranged in master controller 103, for example, taking rated power as 60W, rated speed is that the AC induction motor of 1300r/min is example, presetting database corresponding in master controller 103 is as shown in the table:
| n(r/min) | Uo(V) | α | I(A) | U(V) |
| 390 | 49.7 | 2.5 | 0.21 | 1.05 |
| 457 | 61 | 2.4 | 0.24 | 1.2 |
| 490 | 72.7 | 2.3 | 0.27 | 1.35 |
| 536 | 84.5 | 2.2 | 0.30 | 1.5 |
| 575 | 96.5 | 2.1 | 0.33 | 1.65 |
| 626 | 108 | 2.0 | 0.36 | 1.8 |
| 670 | 120 | 1.9 | 0.39 | 1.95 |
| 726 | 131.3 | 1.8 | 0.42 | 2.1 |
| 770 | 142 | 1.7 | 0.45 | 2.25 |
| 810 | 152.6 | 1.6 | 0.48 | 2.4 |
| 857 | 162 | 1.5 | 0.51 | 2.55 |
| 908 | 171.5 | 1.4 | 0.53 | 2.65 |
| 960 | 179.8 | 1.3 | 0.56 | 2.8 |
| 1011 | 187.4 | 1.2 | 0.59 | 2.95 |
| 1060 | 194 | 1.1 | 0.62 | 3.1 |
| 1109 | 200 | 1.0 | 0.65 | 3.25 |
| 1150 | 205 | 0.9 | 0.68 | 3.4 |
| 1212 | 209 | 0.8 | 0.71 | 3.55 |
| 1255 | 212.5 | 0.7 | 0.74 | 3.7 |
| 1298 | 215 | 0.6 | 0.77 | 3.85 |
As can be known from the above table, in presetting database, comprise multi-group data, in every group of data, comprise the rotation speed n, stator voltage Uo, copped wave pilot angle α, sample rate current I and the sampled voltage U that form mapping relations.So, the sampled voltage U that master controller 103 can feed back according to Voltage Feedback module 102 gets corresponding copped wave pilot angle α from presetting database in a certain group of data, the pulse signal that is then α/π according to obtained copped wave pilot angle α output duty cycle.
For example, suppose that the sampled voltage U that Voltage Feedback module 102 is fed back is 2.4V, master controller 103 can known corresponding rotating speed be 810r/min from presetting database (i.e. table), copped wave pilot angle α is 1.6, so master controller 103 can output duty cycles be that the pulse signal of 1.6/ π is to driver module 104, driver module 104 will be the pulse signal of 1.6/ π according to duty ratio, making copped wave module 105 is the corresponding stator voltage Uo of 1.6 output according to copped wave pilot angle α, the stator voltage Uo of AC induction motor 200 follows copped wave pilot angle α and changes, thereby rotating speed is adjusted.
Fig. 3 shows the exemplary circuit structure of the AC induction motor control circuit that the embodiment of the present invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention, and details are as follows:
Current sample module 101 comprises the first capacitor C 1 summation current transformer T1, the first end of the first capacitor C 1 and the second end are respectively the first sampling end and second sampling end of current sample module 101, the first end of the primary coil of current transformer T1 connects the second end of the first capacitor C 1, the second end of the primary coil of current transformer T1 is the zero line side of current sample module 101, and the first end of the secondary coil of current transformer T1 and the second end are respectively the first output and second output of current sample module 101.
Voltage Feedback module 102 comprises:
The first resistance R 1, bidirectional diode D1, electrochemical capacitor E1, the second resistance R 2 and the second capacitor C 2;
The common contact of the input utmost point of the first end of the first resistance R 1 and bidirectional diode D1 is the first input end of Voltage Feedback module 102, the second end of the first resistance R 1 is the second input of Voltage Feedback module 102, the positive pole of the output stage of bidirectional diode D1 and electrochemical capacitor E1 is connected to the first end of the second resistance R 2 altogether, the common contact of the second end of the second resistance R 2 and the first end of the second capacitor C 2 is the output of Voltage Feedback module 102, the second end ground connection of the second end of the negative pole of electrochemical capacitor E1 and the first resistance R 1 and the second capacitor C 2, and be connected with the negative pole of electrochemical capacitor E1 and the second end of the first resistance R 1 simultaneously.
Master controller 103 can be specifically the Programmable Logic Controller that conventional single-chip microcomputer, arm processor or other possess signal logic disposal ability.
Driver module 104 comprises:
The 3rd resistance R 3, the 4th resistance R 4 and NPN type triode Q1;
The first end of the 3rd resistance R 3 is the controlled end of driver module 104, the second end of the 3rd resistance R 3 and the first end of the 4th resistance R 4 are connected to the base stage of NPN type triode Q1 altogether, the emitter of the second end of the 4th resistance R 4 and NPN type triode Q1 is connected to ground, the very drive end of driver module 104 of current collection of NPN type triode Q1 altogether.
Copped wave module 105 comprises:
The 5th resistance R 5, optocoupler controllable silicon U1, inductance L 1, the 6th resistance R 6 and the 3rd capacitor C 3;
The first end of the 5th resistance R 5 is the copped wave controlled end of copped wave module 105, the second end of the 5th resistance R 5 connects the negative electrode of the light-emitting diode of optocoupler controllable silicon U1, the anodic bonding DC power supply VCC of the light-emitting diode of optocoupler controllable silicon U1, the first end of the bidirectional triode thyristor in optocoupler controllable silicon U1 connects the first end of inductance L 1, the common contact of the second end of the bidirectional triode thyristor in optocoupler controllable silicon U1 and the first end of the 6th resistance R 6 is the live wire end of copped wave module 105, the second end of the 6th resistance R 6 connects the first end of the 3rd capacitor C 3, the common contact of the second end of the second end of inductance L 1 and the 3rd capacitor C 3 is the output of copped wave module 105.
Below in conjunction with operation principle, above-mentioned AC induction motor control circuit is described further:
In the running of AC induction motor 200, by the first capacitor C 1, the stator current of AC induction motor 200 is carried out to current sample by current transformer T1, and produce sampled voltage in the first resistance R 1, this sampled voltage feeds back to master controller 103 after bidirectional diode D1 rectification and electrochemical capacitor E1 filtering, master controller 103 is known current motor speed n according to this sampled voltage from presetting database, and obtain corresponding copped wave pilot angle α, then the break-make of the pulse signal control NPN type triode Q1 that is α/π according to this copped wave pilot angle α output duty cycle, following duty ratio at NPN type triode Q1 is that the pulse signal of α/π is realized in the process of corresponding break-make, optocoupler controllable silicon U1 just can carry out copped wave processing to input AC electricity according to copped wave pilot angle α, to export corresponding stator voltage to AC induction motor 200, thereby the rotating speed of AC induction motor 200 is adjusted accordingly.
The embodiment of the present invention provides the AC induction motor control circuit that comprises current sample module 101, Voltage Feedback module 102, master controller 103, driver module 104 and copped wave module 105, and its circuit structure is simple and cost is low, by current sample module 101, the stator current of AC induction motor 200 is sampled, and export sample rate current to Voltage Feedback module 102, Voltage Feedback module 102 generates corresponding sampled voltage according to this sample rate current, and this sampled voltage is fed back to master controller 103, master controller 103 obtains copped wave pilot angle according to described sampled voltage from presetting database, and drive accordingly signal to driver module 104 according to this copped wave pilot angle output, driver module 104 makes copped wave module 105 adjust the stator voltage of AC induction motor 200 according to described copped wave pilot angle according to this driving signal, so that AC induction motor 200 turns round according to the rotating speed corresponding with this stator voltage, thereby can realize high-precision stepless speed regulation to AC induction motor 200, solve the existing problem that cannot realize high accuracy rotating speed control in situation cheaply to motor of prior art.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (11)
1. an AC induction motor control circuit, is connected with AC induction motor, it is characterized in that, described AC induction motor control circuit comprises:
Current sample module, Voltage Feedback module, master controller, driver module and copped wave module;
The first sampling end of described current sample module is all connected described AC induction motor with the second sampling end, the zero line side of described current sample module connects alternating current zero line, the first input end of described Voltage Feedback module and the second input are connected respectively the first output and second output of described current sample module, the output of described Voltage Feedback module connects described master controller, described master controller also connects the controlled end of described driver module, the drive end of described driver module connects the copped wave controlled end of described copped wave module, the live wire end of described copped wave module is connected respectively alternating current fire wire and described AC induction motor with output,
Described current sample module is sampled to the stator current of described AC induction motor, and export sample rate current to described Voltage Feedback module, described Voltage Feedback module generates corresponding sampled voltage according to described sample rate current, and described sampled voltage is fed back to described master controller, described master controller obtains copped wave pilot angle according to described sampled voltage from presetting database, and according to the corresponding extremely described driver module of signal that drives of described copped wave pilot angle output, described driver module makes described copped wave module adjust the stator voltage of described AC induction motor according to described copped wave pilot angle according to described driving signal, so that described AC induction motor turns round according to the rotating speed corresponding with described stator voltage.
2. AC induction motor control circuit as claimed in claim 1, is characterized in that, described driving signal is that duty ratio is the pulse signal of α/π, and wherein, α is described copped wave pilot angle, and π is circumference ratio.
3. AC induction motor control circuit as claimed in claim 1, is characterized in that, in described presetting database, comprises multi-group data, comprises the rotating speed, stator voltage, copped wave pilot angle, sample rate current and the sampled voltage that form mapping relations in every group of data.
4. AC induction motor control circuit as claimed in claim 1, it is characterized in that, described current sample module comprises the first electric capacity summation current transformer, the first end of described the first electric capacity and the second end are respectively the first sampling end and second sampling end of described current sample module, the first end of the primary coil of described current transformer connects the second end of described the first electric capacity, the second end of the primary coil of described current transformer is the zero line side of described current sample module, the first end of the secondary coil of described current transformer and the second end are respectively the first output and second output of described current sample module.
5. AC induction motor control circuit as claimed in claim 1, is characterized in that, described Voltage Feedback module comprises:
The first resistance, bidirectional diode, electrochemical capacitor, the second resistance and the second electric capacity;
The common contact of the input utmost point of the first end of described the first resistance and described bidirectional diode is the first input end of described Voltage Feedback module, the second end of described the first resistance is the second input of described Voltage Feedback module, the output stage of described bidirectional diode and the positive pole of described electrochemical capacitor are connected to the first end of described the second resistance altogether, the common contact of the second end of described the second resistance and the first end of described the second electric capacity is the output of described Voltage Feedback module, the second end ground connection of the second end of the negative pole of described electrochemical capacitor and described the first resistance and described the second electric capacity, and be connected with the negative pole of described electrochemical capacitor and the second end of described the first resistance simultaneously.
6. AC induction motor control circuit as claimed in claim 1, is characterized in that, described driver module comprises:
The 3rd resistance, the 4th resistance and NPN type triode;
The first end of described the 3rd resistance is the controlled end of described driver module, the second end of described the 3rd resistance and the first end of described the 4th resistance are connected to the base stage of described NPN type triode altogether, the emitter of the second end of described the 4th resistance and described NPN type triode is connected to ground, the drive end of the very described driver module of current collection of described NPN type triode altogether.
7. AC induction motor control circuit as claimed in claim 1, is characterized in that, described copped wave module comprises:
The 5th resistance, optocoupler controllable silicon, inductance, the 6th resistance and the 3rd electric capacity;
The first end of described the 5th resistance is the copped wave controlled end of described copped wave module, the second end of described the 5th resistance connects the negative electrode of described optocoupler silicon controlled light-emitting diode, the anodic bonding DC power supply of described optocoupler silicon controlled light-emitting diode, the first end of the bidirectional triode thyristor in described optocoupler controllable silicon connects the first end of described inductance, the common contact of the second end of the bidirectional triode thyristor in described optocoupler controllable silicon and the first end of described the 6th resistance is the live wire end of described copped wave module, the second end of described the 6th resistance connects the first end of described the 3rd electric capacity, the common contact of the second end of the second end of described inductance and described the 3rd electric capacity is the output of described copped wave module.
8. an air conditioner, comprises AC induction motor, it is characterized in that, described air conditioner also comprises the AC induction motor control circuit as described in claim 1 to 7 any one.
9. the AC induction motor control method based on AC induction motor control circuit claimed in claim 1, is characterized in that, described AC induction motor control method comprises the following steps:
Current sample module is sampled to the stator current of described AC induction motor, and exports sample rate current to Voltage Feedback module;
Described Voltage Feedback module generates corresponding sampled voltage according to described sample rate current, and described sampled voltage is fed back to master controller;
Described master controller obtains copped wave pilot angle according to described sampled voltage from presetting database, and drives accordingly signal to driver module according to described copped wave pilot angle output;
Described driver module makes copped wave module adjust the stator voltage of described AC induction motor according to described copped wave pilot angle according to described driving signal, so that described AC induction motor turns round according to the rotating speed corresponding with described stator voltage.
10. AC induction motor control method as claimed in claim 9, is characterized in that, described driving signal is that duty ratio is the pulse signal of α/π, and wherein, α is described copped wave pilot angle, and π is circumference ratio.
11. AC induction motor control methods as claimed in claim 9, is characterized in that, in described presetting database, comprise multi-group data, comprise the rotating speed, stator voltage, copped wave pilot angle, sample rate current and the sampled voltage that form mapping relations in every group of data.
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| CN107276464A (en) * | 2017-06-29 | 2017-10-20 | 宁波汉浦工具有限公司 | The start-up circuit and brushless electric machine starting method of a kind of brushless electric machine |
| CN107276464B (en) * | 2017-06-29 | 2020-07-03 | 宁波汉浦工具有限公司 | Starting method of starting circuit of brushless motor |
| CN113872480A (en) * | 2021-09-27 | 2021-12-31 | 佛山市顺德区美的电子科技有限公司 | Design method and device of phase compensator, storage medium and acquisition system |
| CN113872480B (en) * | 2021-09-27 | 2023-11-10 | 佛山市顺德区美的电子科技有限公司 | Design method and device of phase compensator, storage medium and acquisition system |
| CN115492786A (en) * | 2022-10-09 | 2022-12-20 | 深圳拓邦股份有限公司 | Fan drive |
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