CN220527826U - Position sensor-less detecting device for brushless DC motor - Google Patents
Position sensor-less detecting device for brushless DC motor Download PDFInfo
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- CN220527826U CN220527826U CN202322197827.3U CN202322197827U CN220527826U CN 220527826 U CN220527826 U CN 220527826U CN 202322197827 U CN202322197827 U CN 202322197827U CN 220527826 U CN220527826 U CN 220527826U
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- 238000001514 detection method Methods 0.000 claims abstract description 23
- 238000004804 winding Methods 0.000 claims abstract description 19
- 238000005070 sampling Methods 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The utility model provides a position-sensor-free detection device of a brushless direct current motor, wherein a data input end of a main control module receives a driving signal, a data output end of the main control module is connected with a data input end of the driving module, and the main control module is configured to transmit the driving signal to the driving module; the data output end of the driving module is connected with the brushless direct current motor, and the driving module is configured to transmit a driving signal to the brushless direct current motor so as to drive the brushless direct current motor; the output ends of three-phase windings in the brushless direct current motor are connected to the main control module through the switching tube module and the driving module in sequence; the switching tube module is configured to collect back electromotive force output by an output end in the three-phase winding and feed back the back to the main control module. The position-sensor-free detection equipment can detect the position of the rotor without installing a Hall sensor in the brushless direct current motor, has low cost and small volume, and avoids the interference problem caused by using the Hall sensor in the prior art.
Description
Technical Field
The utility model relates to the technical field of circuit detection, in particular to a position-sensor-free detection device of a brushless direct current motor.
Background
At present, the position detection of the brushless direct current motor is mainly carried out by adopting a Hall sensor, namely, the position of a rotor is detected by the Hall sensor arranged on the brushless direct current motor, so that the rotor is fed back to a main control module, and the main control module adjusts a driving instruction of the brushless direct current motor according to the fed-back position of the rotor to drive the brushless direct current motor to work. However, this method requires the installation of a hall sensor in the brushless dc motor, which is costly, increases the size of the brushless dc motor, and causes some interference with the hall sensor.
Disclosure of Invention
Therefore, the utility model aims to provide the sensorless detection equipment of the brushless direct current motor, which has low cost, small volume and strong anti-interference performance.
A position-sensor-free detection device of a brushless DC motor comprises a main control module, a driving module and a switching tube module;
the data input end of the main control module receives the driving signal, the data output end of the main control module is connected with the data input end of the driving module, and the main control module is configured to transmit the driving signal to the driving module;
the data output end of the driving module is connected with the brushless direct current motor, and the driving module is configured to transmit a driving signal to the brushless direct current motor so as to drive the brushless direct current motor;
the output ends of three-phase windings in the brushless direct current motor are connected to the main control module through the switching tube module and the driving module in sequence; the switching tube module is configured to collect back electromotive force output by an output end in the three-phase winding and feed back the back to the main control module.
Further, the driving signal is a PWM signal.
Further, the main control module comprises a main control chip, and the main control chip comprises 6 data output ends;
the driving module comprises a driving chip, wherein the driving chip comprises 6 data input ends and 6 data output ends;
the 6 data output ends of the main control chip are respectively connected to the 6 data input ends of the driving chip; the 6 data output ends of the driving chip are connected with the brushless direct current motor.
Further, the switching tube module comprises 3 data sampling ends and 6 data output ends; the driving module comprises 6 feedback input ends and 3 feedback output ends; the main control module comprises 3 feedback input ends;
the three-phase winding control circuit comprises a switching tube module, a driving module, a control module and a control module, wherein 3 data sampling ends in the switching tube module are respectively connected to output ends of three-phase windings in the brushless direct current motor, 6 data output ends in the switching tube module are respectively connected to 6 feedback input ends of the driving module, and 3 feedback output ends of the driving module are respectively connected to 3 feedback input ends of the control module.
Further, the switching tube module includes 6 switching tubes: the switching device comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube and a sixth switching tube;
the source electrode of the first switching tube, the source electrode of the second switching tube and the source electrode of the third switching tube are respectively connected to the drain electrode of the fourth switching tube, the drain electrode of the fifth switching tube and the drain electrode of the sixth switching tube; the source electrode of the first switching tube, the source electrode of the second switching tube and the source electrode of the third switching tube are respectively used as 3 data sampling ends in the switching tube module; the drain electrode of the first switching tube, the drain electrode of the second switching tube, the drain electrode of the third switching tube, the source electrode of the fourth switching tube, the source electrode of the fifth switching tube and the source electrode of the sixth switching tube are respectively connected to a power supply signal; the grid electrode of the first switching tube, the grid electrode of the second switching tube, the grid electrode of the third switching tube, the grid electrode of the fourth switching tube, the grid electrode of the fifth switching tube and the grid electrode of the sixth switching tube are respectively used as 6 data output ends in the switching tube module.
Further, the system also comprises a plurality of interface modules which are respectively connected with the main control module.
Further, the interface module includes:
can interface module, USB interface module, type-c interface module, PWM interface module, ADC interface module, serial ports module.
Further, the system also comprises temperature modules respectively connected with the main control module;
the temperature module comprises a temperature-sensitive resistor arranged at a position to be detected in the position-free sensor detection equipment; one end of the temperature sensitive resistor is connected with a power signal, and the other end of the temperature sensitive resistor is connected with a resistor in series to be grounded.
Further, the other end of the temperature sensitive resistor is connected in series with a capacitor to be grounded.
The position-sensor-free detection equipment provided by the utility model can detect the position of the rotor without installing a Hall sensor in the brushless direct current motor, has low cost and small size, and avoids the interference problem caused by using the Hall sensor in the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. In the drawings, elements or portions thereof are not necessarily drawn to scale.
Fig. 1 is a block diagram of a position sensor-less detection apparatus provided in an embodiment.
Fig. 2 is a circuit diagram of a master control module according to an embodiment.
Fig. 3 is a circuit diagram of a driving module according to an embodiment.
Fig. 4 is a schematic diagram of a switching tube module according to an embodiment.
Fig. 5 is a circuit diagram of a switching tube module according to an embodiment.
Fig. 6 is a circuit diagram of a USB interface and a TYPE-C interface provided in an embodiment.
Fig. 7 is a circuit diagram of a PWM interface according to an embodiment.
Fig. 8 is a circuit diagram of an ADC interface and a serial port according to an embodiment.
Fig. 9 is a circuit diagram of a can interface provided in an embodiment.
Fig. 10 is a circuit diagram of a temperature module according to an embodiment.
Detailed Description
Embodiments of the technical scheme of the present utility model will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and thus are merely examples, and are not intended to limit the scope of the present utility model.
Square wave current is led into a stator winding of the brushless direct current motor, counter electromotive force of trapezoidal waves is induced by the stator winding through interaction of an armature winding and an air-immersed magnetic field, zero crossing points of counter electromotive force of the trapezoidal waves are delayed by 30 degrees, and an electric angle just corresponds to phase change time of a switching tube.
Examples:
a position-sensor-free detection device of a brushless DC motor, see FIG. 1, comprises a main control module, a driving module and a switching tube module;
the data input end of the main control module receives the driving signal, the data output end of the main control module is connected with the data input end of the driving module, and the main control module is configured to transmit the driving signal to the driving module;
the data output end of the driving module is connected with the brushless direct current motor, and the driving module is configured to transmit a driving signal to the brushless direct current motor so as to drive the brushless direct current motor;
the output ends of three-phase windings in the brushless direct current motor are connected to the main control module through the switching tube module and the driving module in sequence; the switching tube module is configured to collect back electromotive force output by an output end in the three-phase winding and feed back the back to the main control module.
In this embodiment, the main control module may receive a driving signal sent by the external chip, where the driving signal may be a PWM signal. The main control module transmits the driving signal to the driving module. The driving module drives the brushless direct current motor by using the driving signal, wherein the driving of the brushless direct current motor by using the driving signal is an existing method, and the brushless direct current motor can automatically start up after receiving the driving signal. The switching tube module collects back electromotive force output by an output end in the three-phase winding and feeds back the back to the main control module, so that the main control module can generate a matched driving signal according to the feedback.
The position-sensor-free detection equipment can detect the position of the rotor without installing a Hall sensor in the brushless direct current motor, has low cost and small volume, and avoids the interference problem caused by using the Hall sensor in the prior art.
Further, referring to fig. 2 and 3, the main control module includes a main control chip, and the main control chip includes 6 data output ends;
the driving module comprises a driving chip, wherein the driving chip comprises 6 data input ends and 6 data output ends;
the 6 data output ends of the main control chip are respectively connected to the 6 data input ends of the driving chip; the 6 data output ends of the driving chip are connected with the brushless direct current motor.
In this embodiment, the model of the main control chip is STM32F405RGT6. The model of the driving chip is DRV8302. The 6 data output ends (PA 10, PB15, PA9, PB14, PA8 and PB13 interfaces) of the main control chip are connected with the 6 data input ends (INH_ A, INL _ A, INH _ B, INL _ B, INH _ C, INL _C interfaces) of the driving chip, and the driving chip can amplify the received driving signals. The 6 data outputs of the drive chip (gh_ A, GL _ A, GH _ B, GL _ B, GH _ C, GL _c interface) are connected to a brushless dc motor.
Further, referring to fig. 4 and 5, the switching tube module includes 3 data sampling terminals and 6 data output terminals; the driving module comprises 6 feedback input ends and 3 feedback output ends; the main control module comprises 3 feedback input ends;
the three-phase winding control circuit comprises a switching tube module, a driving module, a control module and a control module, wherein 3 data sampling ends in the switching tube module are respectively connected to output ends of three-phase windings in the brushless direct current motor, 6 data output ends in the switching tube module are respectively connected to 6 feedback input ends of the driving module, and 3 feedback output ends of the driving module are respectively connected to 3 feedback input ends of the control module.
Wherein, the switching tube module includes 6 switching tubes: the switching device comprises a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, a fourth switching tube Q4, a fifth switching tube Q5 and a sixth switching tube Q6;
the source electrode of the first switching tube Q1, the source electrode of the second switching tube Q2 and the source electrode of the third switching tube Q3 are respectively connected to the drain electrode of the fourth switching tube Q4, the drain electrode of the fifth switching tube Q5 and the drain electrode of the sixth switching tube Q6; the source electrode of the first switching tube Q1, the source electrode of the second switching tube Q2 and the source electrode of the third switching tube Q3 are respectively used as 3 data sampling ends in the switching tube module; the drain electrode of the first switching tube Q1, the drain electrode of the second switching tube Q2, the drain electrode of the third switching tube Q3, the source electrode of the fourth switching tube Q4, the source electrode of the fifth switching tube Q5 and the source electrode of the sixth switching tube Q6 are respectively connected to a power supply signal; the grid electrode of the first switching tube Q1, the grid electrode of the second switching tube Q2, the grid electrode of the third switching tube Q3, the grid electrode of the fourth switching tube Q4, the grid electrode of the fifth switching tube Q5 and the grid electrode of the sixth switching tube Q6 are respectively used as 6 data output ends in the switching tube modules.
In the present embodiment, the output terminals of the three-phase windings in the brushless dc motor are denoted as A, B, C in fig. 4, and the 6 data output terminals (the sources of the 6 switching tubes) in the switching tube module are connected to the 6 feedback input terminals (sh_ A, SH _ B, SH _ C, SL _ A, SL _ B, SL _c) of the driving module. The 3 feedback output ends (SH_ A, SH _ B, SH _C are respectively connected with a resistor in series) of the driving module are respectively connected to the 3 feedback input ends (PA 0, PA1 and PA 2) of the main control module. The main control module can obtain the position information of each rotor according to the feedback signals, so that the rotating speed information and the torque information are obtained.
Further, the system also comprises a plurality of interface modules which are respectively connected with the main control module.
In this embodiment, the interface module may be a can interface module, a USB interface module, a type-c interface module, a PWM interface module, an ADC interface module, and a serial port module, fig. 6 is a circuit diagram of the USB interface and the type-c interface, fig. 7 is a circuit diagram of the PWM interface, fig. 8 is a circuit diagram of the ADC interface and the serial port, and fig. 9 is a circuit diagram of the can interface.
Further, the system also comprises temperature modules respectively connected with the main control module;
the temperature module comprises a temperature-sensitive resistor arranged at a position to be detected in the position-free sensor detection equipment; one end of the temperature sensitive resistor is connected with a power signal, and the other end of the temperature sensitive resistor is connected with a resistor in series to be grounded. The other end of the temperature-sensitive resistor is also connected in series with a capacitor to be grounded.
In this embodiment, referring to fig. 10, the temperature sensing resistor R39 may be disposed at a position where temperature is required to be detected, and the temperature sensing resistor R39 generates a resistance change along with temperature to enable TEMP to generate different voltages to be input to the main control module, so as to obtain the temperature of the position.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model, and are intended to be included within the scope of the appended claims and description.
Claims (9)
1. The position-sensor-free detection equipment of the brushless direct current motor is characterized by comprising a main control module, a driving module and a switching tube module;
the data input end of the main control module receives the driving signal, the data output end of the main control module is connected with the data input end of the driving module, and the main control module is configured to transmit the driving signal to the driving module;
the data output end of the driving module is connected with the brushless direct current motor, and the driving module is configured to transmit a driving signal to the brushless direct current motor so as to drive the brushless direct current motor;
the output ends of three-phase windings in the brushless direct current motor are connected to the main control module through the switching tube module and the driving module in sequence; the switching tube module is configured to collect back electromotive force output by an output end in the three-phase winding and feed back the back to the main control module.
2. The sensorless detection apparatus of a brushless dc motor of claim 1 wherein the drive signal is a PWM signal.
3. The sensorless detection apparatus of a brushless DC motor of claim 1,
the main control module comprises a main control chip, and the main control chip comprises 6 data output ends;
the driving module comprises a driving chip, wherein the driving chip comprises 6 data input ends and 6 data output ends;
the 6 data output ends of the main control chip are respectively connected to the 6 data input ends of the driving chip; the 6 data output ends of the driving chip are connected with a brushless direct current motor.
4. A sensorless detection apparatus of a brushless DC motor as claimed in claim 3,
the switching tube module comprises 3 data sampling ends and 6 data output ends; the driving module comprises 6 feedback input ends and 3 feedback output ends; the main control module comprises 3 feedback input ends;
the three-phase winding control circuit comprises a drive module, a brushless DC motor, a switching tube module, a control module and a control module, wherein 3 data sampling ends in the switching tube module are respectively connected to output ends of three-phase windings in the brushless DC motor, 6 data output ends in the switching tube module are respectively connected to 6 feedback input ends of the drive module, and 3 feedback output ends of the drive module are respectively connected to 3 feedback input ends of the control module.
5. The sensorless detection apparatus of a brushless dc motor of claim 4 wherein the switching tube module includes 6 switching tubes: the switching device comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube and a sixth switching tube;
the source electrode of the first switching tube, the source electrode of the second switching tube and the source electrode of the third switching tube are respectively connected to the drain electrode of the fourth switching tube, the drain electrode of the fifth switching tube and the drain electrode of the sixth switching tube; the source electrode of the first switching tube, the source electrode of the second switching tube and the source electrode of the third switching tube are respectively used as 3 data sampling ends in the switching tube module; the drain electrode of the first switching tube, the drain electrode of the second switching tube, the drain electrode of the third switching tube, the source electrode of the fourth switching tube, the source electrode of the fifth switching tube and the source electrode of the sixth switching tube are respectively connected to a power supply signal; the grid electrode of the first switching tube, the grid electrode of the second switching tube, the grid electrode of the third switching tube, the grid electrode of the fourth switching tube, the grid electrode of the fifth switching tube and the grid electrode of the sixth switching tube are respectively used as 6 data output ends in the switching tube module.
6. The sensorless detection apparatus of a brushless dc motor of claim 1, further comprising a plurality of interface modules respectively connected to the main control module.
7. The sensorless detection apparatus of the brushless dc motor of claim 6, wherein the interface module comprises:
can interface module, USB interface module, type-c interface module, PWM interface module, ADC interface module, serial ports module.
8. The sensorless detection apparatus of a brushless dc motor of claim 1, further comprising temperature modules respectively connected to the main control modules;
the temperature module comprises a temperature-sensitive resistor arranged at a position to be detected in the position-free sensor detection equipment; one end of the temperature sensitive resistor is connected with a power signal, and the other end of the temperature sensitive resistor is connected with a resistor in series to be grounded.
9. The sensorless detection apparatus of claim 8 wherein the other end of the temperature sensitive resistor is further connected in series with a capacitor connected to ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322197827.3U CN220527826U (en) | 2023-08-16 | 2023-08-16 | Position sensor-less detecting device for brushless DC motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322197827.3U CN220527826U (en) | 2023-08-16 | 2023-08-16 | Position sensor-less detecting device for brushless DC motor |
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| Publication Number | Publication Date |
|---|---|
| CN220527826U true CN220527826U (en) | 2024-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322197827.3U Active CN220527826U (en) | 2023-08-16 | 2023-08-16 | Position sensor-less detecting device for brushless DC motor |
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| Country | Link |
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| CN (1) | CN220527826U (en) |
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2023
- 2023-08-16 CN CN202322197827.3U patent/CN220527826U/en active Active
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