CN219592238U - Motor detecting system and dental planter - Google Patents
Motor detecting system and dental planter Download PDFInfo
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- CN219592238U CN219592238U CN202320662915.3U CN202320662915U CN219592238U CN 219592238 U CN219592238 U CN 219592238U CN 202320662915 U CN202320662915 U CN 202320662915U CN 219592238 U CN219592238 U CN 219592238U
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Abstract
The embodiment of the utility model provides a motor detection system and a dental planter, and relates to the technical field of motor control and dental medical appliances. The motor detection system comprises a motor, a control module, a winding sampling module and a Hall signal detection module. The winding sampling module is used for collecting back electromotive force of each winding of the motor; the Hall signal detection module is used for detecting a Hall signal of the motor. If the Hall signal detection module is abnormal, the control module can automatically control and switch to the winding sampling module, and even if the line of the Hall sensor in the motor circuit fails, the state of the motor can be sensed by the winding sampling module so as to further control; if the winding sampling module is detected to be abnormal, the winding sampling module can be automatically switched to the Hall signal detection module.
Description
Technical Field
The utility model relates to the technical field of motor control and dental medical appliances, in particular to a motor detection system and a planter.
Background
When the dental planter is in operation, the rotation speed of a motor (hereinafter referred to as a motor) needs to be monitored, so as to judge whether the running state of the motor is abnormal.
The dental planter can adopt a motor with a Hall sensor, wherein the position of a motor rotor is detected through the Hall sensor, and whether the motor operates normally is judged through an abnormal detection program of the Hall sensor.
The number of wires of the hall sensor is large, and therefore, the probability of faults is also relatively high. If the line of the hall sensor fails, the rotational speed of the motor cannot be monitored.
Therefore, how to cope with the line faults of the hall sensor in the motor circuit is a technical problem to be solved.
Disclosure of Invention
The utility model aims to provide a motor detection system and a dental planter, which are used for solving the technical problem of line faults of Hall sensors in the prior art.
In order to achieve the above purpose, the following technical scheme is adopted in the embodiment of the utility model.
In a first aspect, an embodiment of the present utility model provides a motor detection system, including a motor, a control module, a winding sampling module, and a hall signal detection module.
The control module is respectively and electrically connected with the motor, the winding sampling module and the Hall signal detection module, and the motor is respectively and electrically connected with the winding sampling module and the Hall signal detection module;
the winding sampling module is used for collecting back electromotive force of each winding of the motor; the Hall signal detection module is used for detecting a Hall signal of the motor.
Optionally, the control module comprises a digital signal processor, a driving circuit and an inverter circuit;
the digital signal processor is respectively and electrically connected with the winding sampling module, the Hall signal detection module and the driving circuit, the driving circuit is electrically connected with the inverter circuit, and the inverter circuit is electrically connected with the motor.
Optionally, the inverter circuit is a three-phase full-bridge inverter circuit.
Optionally, the three-phase full-bridge inverter circuit comprises a first bridge arm unit, a second bridge arm unit and a third bridge arm unit; the first bridge arm unit, the second bridge arm unit and the third bridge arm unit are connected in parallel between a first parallel connection point and a second parallel connection point;
the first bridge arm unit comprises a first MOS tube and a second MOS tube which are connected in series in the same direction, and the connection point between the first MOS tube and the second MOS tube is a first series connection point;
the second bridge arm unit comprises a third MOS tube and a fourth MOS tube which are connected in series in the same direction, and the connection point between the third MOS tube and the fourth MOS tube is a second series connection point;
the third bridge arm unit comprises a fifth MOS tube and a sixth MOS tube which are connected in series in the same direction, and the connection point between the fifth MOS tube and the sixth MOS tube is a third series connection point;
the control ends of the MOS tubes are electrically connected with the driving circuit;
the first parallel connection point and the second parallel connection point are used for being connected to a power supply;
the first, second and third series connection points are for connecting three-phase windings of the motor.
Optionally, the driving circuit includes three sets of driving ends, each set of driving ends includes a positive driving end and a negative driving end, and the positive driving end and the negative driving end are used for being connected with the control ends of two MOS tubes in one bridge arm unit, and the positive driving end and the negative driving end are used for outputting opposite logic signals.
Optionally, the hall signal detection module includes a first detection resistor, a second detection resistor and a third detection resistor;
the first end of the first detection resistor, the first end of the second detection resistor and the first end of the third detection resistor are connected to a detection power supply, and the second end of the first detection resistor, the second end of the second detection resistor and the second end of the third detection resistor are respectively connected with three-phase Hall signals.
Optionally, the motor detection system further comprises a current amplifying circuit, and the winding sampling module is connected to the control module through the current amplifying circuit.
Optionally, the motor detection system further comprises a current filter circuit, and the current amplifying circuit is connected to the control module through the current filter circuit.
Optionally, the motor detection system further comprises a hall signal filter circuit, and the hall signal detection module is connected to the control module through the hall signal filter circuit.
In a second aspect, an embodiment of the present utility model provides a dental planter comprising a dental handpiece, a transmission mechanism, and the motor detection system of the first aspect.
Compared with the prior art, the utility model has the following beneficial effects:
the motor detection system and the dental planter provided by the embodiment of the utility model comprise the Hall signal detection module and the winding sampling module, if the Hall signal detection module is detected to be abnormal, the control module can automatically control the switching to the winding sampling module, and even if the line of the Hall sensor in a motor circuit fails, the state of the motor can be sensed through the winding sampling module, so that the control is further performed; if the winding sampling module is detected to be abnormal, the winding sampling module can be automatically switched to the Hall signal detection module.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a motor detection system according to an embodiment of the present utility model;
fig. 2 is a schematic diagram of a motor detection system including a digital signal processor, a driving circuit and an inverter circuit according to an embodiment of the present utility model;
fig. 3 is a schematic diagram of a three-phase full-bridge inverter circuit according to an embodiment of the present utility model;
FIG. 4 is a schematic diagram of a driving circuit according to an embodiment of the present utility model;
fig. 5 is a schematic diagram of a winding sampling module connected to a three-phase full-bridge inverter circuit according to an embodiment of the present utility model;
fig. 6 is a schematic diagram of a current amplifying circuit and a current filtering circuit according to an embodiment of the present utility model;
fig. 7 is a schematic diagram of a hall signal detection module and a hall signal filtering circuit according to an embodiment of the present utility model;
fig. 8 is a schematic diagram of another motor detection system according to an embodiment of the present utility model.
Reference numerals illustrate:
10-motor
20-control module
21-digital signal processor
22-drive circuit
23-inverter circuit
231-first bridge arm unit
232-second bridge arm unit
233-third bridge arm unit
30-winding sampling module
301-current amplifying circuit
302-current filter circuit
40-Hall signal detection module
401-Hall signal filter circuit
50-drive mechanism
60-dental handpiece
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model. The following embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present utility model, it should be noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The term "coupled" is to be interpreted broadly, as being a fixed connection, a removable connection, or an integral connection, for example; can be directly connected or indirectly connected through an intermediate medium.
In the existing motor circuit, the probability of faults is also relatively high because of the large number of wiring of the Hall sensors. If the line of the hall sensor fails, the rotational speed of the motor cannot be monitored.
In order to address the above problems, referring to fig. 1, an embodiment of the present utility model provides a detection system for a motor 10, which includes a motor 10, a control module 20, a winding sampling module 30, and a hall signal detection module 40. The motor 10 may be a brushless motor with a hall sensor, or a hall sensor may be mounted on the motor 10. The hall sensor may form a hall signal, detect the rotor of the motor 10, and further determine the running state such as the rotation speed of the motor 10.
The connection relation is as follows: the control module 20 is electrically connected with the motor 10, the winding sampling module 30 and the hall signal detection module 40 respectively, and the motor 10 is electrically connected with the winding sampling module 30 and the hall signal detection module 40 respectively.
The winding sampling module 30 is used to collect back emf of the various windings of the motor 10. The hall signal detection module 40 is configured to detect a hall signal of the motor 10.
If the Hall signal detection module 40 is detected to be abnormal, the control module 20 can automatically control and switch to the winding sampling module 30, and even if the circuit of the Hall sensor in the circuit of the motor 10 is faulty, the state of the motor 10 can be sensed by the winding sampling module 30 so as to further control; if an abnormality of the winding sampling module 30 is detected, it may be automatically switched to the hall signal detection module 40.
The hall sensor abnormality signal detection program is only required to be stored in the control module 20, and the hall sensor abnormality signal detection program can realize the above functions.
One embodiment of the control module 20 as shown in fig. 2, the control module 20 includes a digital signal processor 21, a driving circuit 22, and an inverter circuit 23.
The connection relation is as follows: the digital signal processor 21 is electrically connected to the winding sampling module 30 and the hall signal detection module 40, and to the driving circuit 22, respectively, the driving circuit 22 is electrically connected to the inverter circuit 23, and the inverter circuit 23 is electrically connected to the motor 10.
The driving circuit 22 and the inverter circuit 23 may be implemented by MOS transistors, and the inverter circuit 23 may be a three-phase full-bridge inverter circuit 23.
Fig. 3 shows a three-phase full-bridge inverter circuit 23 composed of MOS transistors, which includes a first leg unit 231, a second leg unit 232, and a third leg unit 233. The connection relationship is described as follows:
the first bridge arm unit 231, the second bridge arm unit 232 and the third bridge arm unit 233 are connected in parallel between the first parallel connection point and the second parallel connection point;
the first bridge arm unit 231 comprises a first MOS tube M1 and a second MOS tube M2 which are connected in parallel and in series, and the connection point between the first MOS tube M1 and the second MOS tube M2 is a first serial connection point;
the second bridge arm unit 232 comprises a third MOS tube M3 and a fourth MOS tube M4 which are connected in parallel and in series, and the connection point between the third MOS tube M3 and the fourth MOS tube M4 is a second series connection point;
the third bridge arm unit 233 comprises a fifth MOS tube M5 and a sixth MOS tube M6 which are connected in parallel and in series, and the connection point between the fifth MOS tube M5 and the sixth MOS tube M6 is a third serial connection point;
the control ends of the MOS tubes are electrically connected with different ends of the driving circuit, as shown in fig. 3, M1 is connected with the GH_A end of the driving circuit, M2 is connected with the GL_A end of the driving circuit, correspondingly, M3 is connected with the GH_B end of the driving circuit, M4 is connected with the GL_A end of the driving circuit, M5 is connected with the GH_C end of the driving circuit, and M6 is connected with the GL_C end of the driving circuit; the driving circuit comprises three groups of driving ends, each group of driving ends comprises a positive driving end GH and a negative driving end GL, the driving ends are used for being connected with control ends of two MOS tubes in one bridge arm unit, and the positive driving ends and the negative driving ends are used for outputting opposite logic signals;
the first parallel connection point and the second parallel connection point are for connection to a power source, udc and ground in fig. 3;
the first, second and third series connection points are used to connect three-phase windings of the motor, U, V, W in fig. 3, respectively.
The drive circuit may include an IR2101 or IR2102 chip. As shown in fig. 4, the HO and LO terminals of the chip are respectively a positive driving terminal and a negative driving terminal, and Vs of the chip is used to provide a source voltage for the MOS transistor therein to form a sufficient gate-source voltage. The HIN terminal and the LIN terminal are used for connecting a PWM_AHO terminal and a PWM_ALO terminal of the control module.
Corresponding to the three-phase windings, the winding sampling module may be provided with three sampling resistors, where the sampling resistors are in a serial relationship with the detected one-phase winding, and fig. 5 shows an example, that is, the sampling resistors are connected in series between the MOS transistors of the three-phase full-bridge inverter circuit and the ground. Can also be arranged between the MOS tube and the motor. The voltage across each resistor is detected as a detection signal.
If the sampled signal of the back electromotive force is smaller, a current amplifying circuit can be arranged as shown in fig. 6, the amplifying circuit comprises an operational amplifier, a plurality of resistors and a power supply, the winding sampling module is connected with the control module through the current amplifying circuit, a current filtering circuit can be arranged for stabilizing the sampled signal, and an output end IC-OUT of the operational amplifier is output as EXT_IC-FB through the current filtering circuit formed by RC and is connected with the control module.
Corresponding to the three-phase windings, the hall signal detection module includes three detection resistors, as shown in fig. 7.
The first ends of the three detection resistors are connected to the detection power supply VDD33D, and the second ends of the three detection resistors are respectively connected to three-phase Hall signals Hall A_IN, hall B_IN and Hall C_IN. In order to stabilize the hall signal, a hall signal filter circuit may be provided, and output terminals hala_1, halb_1, and halc_1 of the hall signal detection module are output as HallA, hallB, hallC through a current filter circuit formed by RC and connected to the control module.
Fig. 8 shows a unitary frame schematic including a dental handpiece, a transmission mechanism, and the motor detection system described above. In the figure, the DSP controller is a digital signal processor 21 in the motor detection system, the PWM hardware interface of the DSP controller is used for outputting a driving signal to the driving circuit, the ADC hardware interface of the DSP controller is used for receiving the signal of the back electromotive force collected by the winding sampling module through the current amplifying circuit 301 and the current filtering circuit 302, and the GPIO hardware interface of the DSP controller is used for receiving the hall signal through the hall signal detection module 40 and the hall signal filtering circuit 401, so as to grasp the motor state and further control the motor. The motor 10 is connected to a dental handpiece 60 via a transmission mechanism 50.
The utility model also provides a dental planter, which comprises the dental handpiece, a transmission mechanism and a motor detection system.
In general, the utility model provides a motor detection system and a dental planter, and relates to the technical fields of motor control and dental medical appliances. The motor detection system comprises a motor, a control module, a winding sampling module and a Hall signal detection module. The winding sampling module is used for collecting back electromotive force of each winding of the motor; the Hall signal detection module is used for detecting a Hall signal of the motor. If the Hall signal detection module is abnormal, the control module can automatically control and switch to the winding sampling module, and even if the line of the Hall sensor in the motor circuit fails, the state of the motor can be sensed by the winding sampling module so as to further control; if the winding sampling module is detected to be abnormal, the winding sampling module can be automatically switched to the Hall signal detection module.
The above-described embodiments of the apparatus and system are merely illustrative, and some or all of the modules may be selected according to actual needs to achieve the objectives of the present embodiment. Those of ordinary skill in the art will understand and implement the present utility model without undue burden.
The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present utility model should be covered by the scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.
Claims (10)
1. The motor detection system is characterized by comprising a motor, a control module, a winding sampling module and a Hall signal detection module;
the control module is respectively and electrically connected with the motor, the winding sampling module and the Hall signal detection module, and the motor is respectively and electrically connected with the winding sampling module and the Hall signal detection module;
the winding sampling module is used for collecting back electromotive force of each winding of the motor; the Hall signal detection module is used for detecting a Hall signal of the motor.
2. The motor detection system of claim 1, wherein the control module comprises a digital signal processor, a drive circuit, and an inverter circuit;
the digital signal processor is respectively and electrically connected with the winding sampling module, the Hall signal detection module and the driving circuit, the driving circuit is electrically connected with the inverter circuit, and the inverter circuit is electrically connected with the motor.
3. The motor detection system of claim 2, wherein the inverter circuit is a three-phase full-bridge inverter circuit.
4. The motor detection system of claim 3, wherein the three-phase full-bridge inverter circuit comprises a first leg unit, a second leg unit, and a third leg unit; the first bridge arm unit, the second bridge arm unit and the third bridge arm unit are connected in parallel between a first parallel connection point and a second parallel connection point;
the first bridge arm unit comprises a first MOS tube and a second MOS tube which are connected in series in the same direction, and the connection point between the first MOS tube and the second MOS tube is a first series connection point;
the second bridge arm unit comprises a third MOS tube and a fourth MOS tube which are connected in series in the same direction, and the connection point between the third MOS tube and the fourth MOS tube is a second series connection point;
the third bridge arm unit comprises a fifth MOS tube and a sixth MOS tube which are connected in series in the same direction, and the connection point between the fifth MOS tube and the sixth MOS tube is a third series connection point;
the control ends of the MOS tubes are electrically connected with the driving circuit;
the first parallel connection point and the second parallel connection point are used for being connected to a power supply;
the first, second and third series connection points are for connecting three-phase windings of the motor.
5. The motor detection system of claim 4, wherein the drive circuit comprises three sets of drive terminals, each set of drive terminals comprising a positive drive terminal and a negative drive terminal for connection with the control terminals of two MOS transistors in one bridge arm unit, and the positive drive terminal and the negative drive terminal for outputting opposing logic signals.
6. The motor detection system of claim 1, wherein the hall signal detection module includes a first detection resistor, a second detection resistor, and a third detection resistor;
the first end of the first detection resistor, the first end of the second detection resistor and the first end of the third detection resistor are connected to a detection power supply, and the second end of the first detection resistor, the second end of the second detection resistor and the second end of the third detection resistor are respectively connected with three-phase Hall signals.
7. The motor detection system of claim 1, further comprising a current amplification circuit, wherein the winding sampling module is coupled to the control module via the current amplification circuit.
8. The motor detection system of claim 7, further comprising a current filter circuit, wherein the current amplification circuit is coupled to the control module through the current filter circuit.
9. The motor detection system of claim 1, further comprising a hall signal filter circuit, wherein the hall signal detection module is coupled to the control module via the hall signal filter circuit.
10. A dental planter, comprising: a dental handpiece, a transmission and a motor detection system according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320662915.3U CN219592238U (en) | 2023-03-29 | 2023-03-29 | Motor detecting system and dental planter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320662915.3U CN219592238U (en) | 2023-03-29 | 2023-03-29 | Motor detecting system and dental planter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219592238U true CN219592238U (en) | 2023-08-25 |
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ID=87699311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320662915.3U Active CN219592238U (en) | 2023-03-29 | 2023-03-29 | Motor detecting system and dental planter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219592238U (en) |
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2023
- 2023-03-29 CN CN202320662915.3U patent/CN219592238U/en active Active
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