CN206180908U - Control system - Google Patents
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- CN206180908U CN206180908U CN201620991946.3U CN201620991946U CN206180908U CN 206180908 U CN206180908 U CN 206180908U CN 201620991946 U CN201620991946 U CN 201620991946U CN 206180908 U CN206180908 U CN 206180908U
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Abstract
The utility model provides a control system, control system includes: electrical source controller, main control unit, power drive module and position detecting element, wherein, electrical source controller to main control unit reaches power drive module provide voltage, main control unit control the power output of power drive module, the power drive module is to a motor output power, position detecting element is through detecting the back -emf zero crossing of the three -phase phase voltage of motor is in order to acquire electric motor rotor rotates the position of in -process and acquires initial position, and will the position that electric motor rotor rotated the in -process reaches electric motor rotor's initial position offers main control unit. Thereby can need not to use hall position sensor, avoid the use to position sensor promptly, also can improve corresponding electric tool's stability from this.
Description
Technical field
The utility model is related to electric tool control technology field, more particularly to a kind of control system, in particular it relates to
Plant based on the control system of DC brushless motor, in particular, be related to a kind of control system for being applied to angle grinder.
Background technology
The popular traditional angle grinder of electric tool circle generally adopts AC series excited machine as the power output of angle grinder,
There is short life (general 100 hours~300 hours), the major defect such as torsion is little, efficiency is low, volume is big.It is well known that
, according to Brush-Less DC motor control commutation, the then angle position for needing Real-time Collection rotor to be located, generally use Hall position
Putting sensor carries out rotor-position detection.And this will also improve the cost of angle grinder, the volume of electrode is increased, namely increased
The volume of angle grinder, further, reduces the stability of angle grinder.Therefore it provides a kind of control system of position-sensor-free
Having united into those skilled in the art needs a problem of solution.
Utility model content
The purpose of this utility model is to provide a kind of control system, to avoid the use of position sensor.
For this purpose, the utility model provides a kind of control system, the control system includes：Power-supply controller of electric, master controller,
Power driver module and position detection unit, wherein,
The power-supply controller of electric to the master controller and the power driver module provide voltage；
The power output of power driver module described in the main controller controls；
The power driver module is to an output power of motor；
The position detection unit is described to obtain by the back-emf zero crossing of the three-phase phase voltage of the detection motor
Position in the rotor rotation process of motor and initial position is obtained, and by the position in the rotor rotation process of the motor
And the initial position of the rotor of the motor is supplied to the master controller.
Optionally, in described control system, the position detection unit is by each of the three-phase phase voltage
After mutually carrying out being compared with the central point of the three-phase phase voltage after electric resistance partial pressure, the back-emf zero passage of three-phase phase voltage is drawn
Point.
Optionally, in described control system, the position detection unit is by the anti-electricity to the three-phase phase voltage
The certain electrical angle of gesture zero crossing time delay obtains the commutation sequential of the motor, and the commutation sequential is supplied to into the main control
Device.
Optionally, in described control system, the master controller is according to the commutation SECO for receiving
The power output of power driver module.
Optionally, in described control system, the position detection unit is by motor of the detection with saliency
Two alternate inductance values obtain the initial position of the rotor of the motor.
Optionally, in described control system, the control system also includes current sampling unit, the current sample
Unit obtains the electric current by the motor, and the electric current of the motor is supplied to into the master controller.
Optionally, in described control system, current control institute of the master controller according to the motor for receiving
State the moment of torsion and/or electric current output of power driver module.
Optionally, in described control system, the current sampling unit is the sampling electricity of multiple sampling resistor compositions
Road or current sample integrated chip.
Optionally, in described control system, when the sampling that the current sampling unit is multiple sampling resistor compositions
During circuit, wherein, the resistance of each sampling resistor is 10 milliohm~100 milliohms.
Optionally, in described control system, the control system also includes temperature sampling unit, the temperature sampling
Unit obtains the temperature of the motor, and the temperature of the motor is supplied to into the master controller.
Optionally, in described control system, temperature control institute of the master controller according to the motor for receiving
State the power output of power driver module.
Optionally, in described control system, the power driver module includes pre- driving module and three phase full bridge module,
Wherein, the pre- driving module realizes level conversion to drive three phase full bridge module using charge pump, the three phase full bridge module to
The motor provides three-phase phase voltage.
Optionally, in described control system, input power is converted into first voltage and by the power-supply controller of electric
Two voltages, wherein, first voltage is supplied to the master controller, second voltage to be supplied to the power driver module.
Optionally, in described control system, the magnitude of voltage of the first voltage is 4.5V~5.5V, and described second is electric
The magnitude of voltage of pressure is 12V~15V.
Optionally, in described control system, the control system is used to control angle grinder.
In the control system that the utility model is provided, position detection unit passes through the anti-of the three-phase phase voltage of detection motor
Potential zero crossing to obtain the rotor rotation process in position and obtain initial position, such that it is able to without using
Hall position sensor, that is, avoid the use for position sensor, thus can also improve stablizing for corresponding electric tool
Property.
Description of the drawings
Fig. 1 is the mount structure schematic diagram of the control system of the utility model embodiment；
Fig. 2 is the detection circuit diagram of the back-emf zero crossing of the three-phase phase voltage of the utility model embodiment；
Fig. 3 be the commutation sequential obtained by the back-emf zero crossing of three-phase phase voltage of the utility model embodiment with it is logical
Cross the comparison diagram of the commutation sequential that hall position sensor is obtained；
Fig. 4 is the structural representation of the power driver module of the utility model embodiment.
Specific embodiment
Below in conjunction with the drawings and specific embodiments pair the utility model proposes a kind of control system make further specifically
It is bright.According to following explanation and claims, advantages and features of the present utility model will become apparent from.It should be noted that, accompanying drawing is equal
In the form of simplifying very much and using non-accurately ratio, only conveniently, lucidly to aid in illustrating the utility model reality
Apply the purpose of example.Particularly, each accompanying drawing needs the emphasis for showing different, often all employs different ratios.
The embodiment of the present application provides a kind of control system, and it can be used to control the electric tools such as angle grinder.Specifically, please
With reference to Fig. 1, it is the mount structure schematic diagram of the control system of the utility model embodiment.As shown in figure 1, the control system 1
Including：Power-supply controller of electric 10, master controller 11, power driver module 12 and position detection unit 13, wherein, the power supply
Device 10 to the master controller 11 and the power driver module 12 provide voltage；The master controller 11 controls the power and drives
The power output of dynamic model block 12；The power driver module 12 is to the power output of a motor 2；The position detection unit 13 passes through
Detect the motor 2 three-phase phase voltage back-emf zero crossing to obtain the rotor rotation process of the motor 2 in position with
And initial position is obtained, and the initial position of the position in the rotor rotation process of the motor 2 and the rotor of the motor 2 is provided
To the master controller 11.
For the angle grinder of relatively conventional AC series excited machine control, the embodiment of the present application uses above-mentioned control system 1, i.e.,
Used as the power output core of angle grinder, brushless electric machine has life-span height, rotating speed height, efficiency high, equal work(to DC brushless motor
The features such as rate small volume.Further, using Brush-Less DC motor control angle grinder life-span generally more than 1000 hours,
It is 3~5 times of the angle grinder that conventional AC series excited machine is controlled.Secondly, the high rotating speed of brushless electric machine is again by certain deceleration
Gear ratio can be obtained relative to the higher torsion of AC series excited machine.In the case of last Same Efficieney, brushless electric machine
Overall volume is less than AC series excited machine by 1/3~1/2 or so, can be more convenient human users so that angle grinder is more compact.
Relative usage hall position sensor is carried out for the angle grinder of the Brush-Less DC motor control of rotor-position detection,
Hall position sensor is magnet-sensitive element, can be damaged by many impacts such as high temperature, thunderbolt, electrostatic, mechanical erections；This
Outward, it usually needs three hall position sensors carry out rotor-position detection, once one of hall position sensor is impaired,
Angle grinder will be unable to normal operation.Therefore, in based on the angle grinder of Brush-Less DC motor control, detected by position detection unit
Position and initial position in rotor rotation process, such that it is able to without using hall position sensor, not only save
The Material Cost of hall position sensor and respective lines plate, and at utmost ensured the stability and reliability of angle grinder
Property.
In the embodiment of the present application, the position detection unit 13 carries out electricity by each phase to the three-phase phase voltage
After being compared with the central point of the three-phase phase voltage after resistance partial pressure, the back-emf zero crossing of three-phase phase voltage is drawn, specifically may be used
With reference to Fig. 2.As shown in Fig. 2 three-phase phase voltage U, V, W are output as BEMFA, BEMFB, BEMFC, Jing Guofen after divider resistance
Three-phase phase voltage BEMFA, BEMFB, BEMFC after pressure is compared respectively with the central point UVW_COM of three-phase phase voltage, so as to
Obtain three back-emf zero crossings.Here, electrical angle of back-emf zero crossing time delay 30 of the three-phase phase voltage or so is as logical
The certain electrical angle of back-emf zero crossing time delay of the commutation sequential crossed obtained by hall position sensor, i.e. three-phase phase voltage, it is excellent
Elect 30 electrical angles as, the commutation sequential for obtaining is identical with by the commutation sequential obtained by hall position sensor, specifically can join
Examine Fig. 3.As shown in figure 3, wherein S1 represents the commutation sequential obtained by the back-emf zero crossing of three-phase phase voltage, S2 represents logical
The commutation sequential crossed obtained by hall position sensor.
In the embodiment of the present application, the commutation sequential is supplied to the master controller by the position detection unit 13
11, the master controller 11 can be defeated according to the power of the commutation SECO/regulation power driver module 12 for receiving
Go out.
Further, the position detection unit 13 is by the 2 liang of alternate inductance values of motor of detection with saliency
Obtain the initial position of the rotor of the motor 2.So as to ensure that the accuracy of obtained initial position.
Accordingly, the embodiment of the present application also provides a kind of control method of above-mentioned control system 1, the control method bag
Include：
Power-supply controller of electric 10 to master controller 11 and power driver module 12 provide voltage；
The master controller 11 controls the power output of the power driver module 12；
The power driver module 12 is to the power output of a motor 2；
The position detection unit 13 obtains described by the back-emf zero crossing of the three-phase phase voltage of the detection motor 2
Position in the rotor rotation process of motor 2 and obtain initial position, and by the position in the rotor rotation process of the motor 2 and
The initial position of the rotor of the motor 2 is supplied to the master controller 11.
Specifically, the power-supply controller of electric 10 provides voltage to the master controller 11 and the power driver module 12,
So that the master controller 11 and the power driver module 12 can work；The position detection unit 13 will be by detection
The back-emf zero crossing of the three-phase phase voltage of the motor 2 is passed through with the position in the rotor rotation process of the motor 2 that obtains
Motor 2 liang alternate inductance value of the detection with saliency obtains the initial position of the rotor of motor 2, and by the motor
The initial position of position and the rotor of the motor 2 in 2 rotor rotation processes is supplied to the master controller 11；The main control
Device 11 controls accordingly the power output of the power driver module 12, specially controls PWM (pulse width modulation) output commutations
Sequential；The power driver module 12 exports corresponding power according to the control of the master controller 11 to the motor 2；It is described
Motor 2 works under the driving of the power driver module 12.
Please continue to refer to Fig. 1, in the embodiment of the present application, the control system 1 also includes current sampling unit 14, described
Current sampling unit 14 obtains the electric current by the motor 2, and the electric current of the motor 2 is supplied to into the master controller
11.Thus, when the electric current for flowing through the motor 2 is excessive, the master controller 11 can control the power driver module 12
Moment of torsion and/or electric current are exported to reduce flowing through the electric current of the motor 2, and so as to avoid, the electric current is excessive to cause the motor 2
Damage etc..Further, in the case where the electric tools such as angle grinder are met and blocked up, it is also possible to by the electric current to the motor 2
Monitoring, improves the power output of the power driver module 12, and then realizes the restarting of the electric tools such as angle grinder 1.
Preferably, the current sampling unit 14 is integrated for the sample circuit or current sample of multiple sampling resistors composition
Chip.When the sample circuit that the current sampling unit 14 is multiple sampling resistors composition, wherein, the resistance of each sampling resistor
It is worth for 10 milliohm~100 milliohms, such that it is able to obtain higher sampling precision, while avoiding larger loss.Wherein, by many
Individual sampling resistor realizes the sampling of electric current, thus, it is possible to realize adopting for the electric current for flowing through motor 2 under convenient, low cost
Sample；Further, the sampling of many places electric current of the control system 1 can also be realized.
Further, the power control system of the control system 1 also includes temperature sampling unit 15, the temperature sampling
Unit 15 obtains the temperature of the motor 2, and the temperature of the motor 2 is supplied to into the master controller.The master controller
11 according to receive the motor 2 temperature control described in power driver module 12 power output.Particularly, when the motor
When 2 temperature is too high, it is zero (i.e. described work(that the master controller 11 can control the power output of the power driver module 12
The not power output of rate drive module 12), cause to damage or other accidents so as to avoid the motor 2 from working on, thus
Improve the Stability and dependability when electric tools such as angle grinder work.
In the embodiment of the present application, the power driver module 12 may include two-part structure, and pre- driving module and three-phase are complete
Bridge module, the pre- driving module realizes level conversion to drive three phase full bridge module, the three phase full bridge module using charge pump
Three-phase phase voltage is provided to the motor 2.Wherein, the pre- driving module can realize that the three-phase is complete by gate drivers
Bridge module can be realized by transistor.Fig. 4 is refer to, it is that the structure of the power driver module of the utility model embodiment is shown
It is intended to.
Common, the master controller 11 and the power driver module 12 adopt different input voltages.Therefore, at this
In application embodiment, input power is converted into first voltage and second voltage by the power-supply controller of electric 10, wherein, first voltage
It is supplied to the master controller 11, second voltage to be supplied to the power driver module 12.Preferably, the master controller 11
Input voltage is 4.5V~5.5V, and the input voltage of the power driver module 12 is 12V~15V, therefore, implement in the application
In example, the magnitude of voltage of the first voltage is 4.5V~5.5V, and the magnitude of voltage of the second voltage is 12V~15V.
As fully visible, in the control system and control method that the utility model embodiment is provided, position detection unit is led to
Cross detection motor three-phase phase voltage back-emf zero crossing to obtain the rotor rotation process in position and obtain
Initial position is taken, such that it is able to without using hall position sensor, that is, avoid the use for position sensor, thus
The stability of corresponding electric tool can be improved.
Foregoing description is only the description to the utility model preferred embodiment, not to any limit of the utility model scope
Calmly, the those of ordinary skill in the utility model field does according to the disclosure above content any change, modification, belonging to right will
Seek the protection domain of book.
Claims (15)
1. a kind of control system, it is characterised in that the control system includes：Power-supply controller of electric, master controller, power drive mould
Block and position detection unit, wherein,
The power-supply controller of electric to the master controller and the power driver module provide voltage；
The power output of power driver module described in the main controller controls；
The power driver module a to motor provides power output；
The position detection unit passes through the back-emf zero crossing of the three-phase phase voltage of the detection motor to obtain the motor
Rotor rotation process in position and obtain initial position, and by the position in the rotor rotation process of the motor and institute
The initial position for stating the rotor of motor is supplied to the master controller.
2. control system as claimed in claim 1, it is characterised in that the position detection unit is by the three-phase mutually electricity
After each phase of pressure carries out being compared with the central point of the three-phase phase voltage after electric resistance partial pressure, the anti-electricity of three-phase phase voltage is drawn
Gesture zero crossing.
3. control system as claimed in claim 2, it is characterised in that the position detection unit is by the three-phase mutually electricity
The certain electrical angle of back-emf zero crossing time delay of pressure obtains the commutation sequential of the motor, and the commutation sequential is supplied to into institute
State master controller.
4. control system as claimed in claim 3, it is characterised in that the master controller is according to the commutation sequential for receiving
Control the power output of the power driver module.
5. control system as claimed in claim 1, it is characterised in that the position detection unit is by detection with salient pole effect
The alternate inductance value of the motor two answered obtains the initial position of the rotor of the motor.
6. the control system as any one of claim 1 to 5, it is characterised in that the control system also includes electric current
Sampling unit, the current sampling unit obtains the electric current by the motor, and the electric current of the motor is supplied to described
Master controller.
7. control system as claimed in claim 6, it is characterised in that electricity of the master controller according to the motor for receiving
The moment of torsion of power driver module described in flow control and/or electric current are exported.
8. control system as claimed in claim 6, it is characterised in that the current sampling unit is multiple sampling resistors composition
Sample circuit or current sample integrated chip.
9. control system as claimed in claim 8, it is characterised in that when the current sampling unit is multiple sampling resistor groups
Into sample circuit when, wherein, the resistance of each sampling resistor is 10 milliohm~100 milliohms.
10. the control system as any one of claim 1 to 5, it is characterised in that the control system also includes temperature
Sampling unit, the temperature sampling unit obtains the temperature of the motor, and the temperature of the motor is supplied to into the master control
Device processed.
11. control systems as claimed in claim 10, it is characterised in that the master controller is according to the motor for receiving
The power output of power driver module described in temperature control.
12. control systems as any one of claim 1 to 5, it is characterised in that the power driver module includes pre-
Driving module and three phase full bridge module, wherein, the pre- driving module realizes level conversion to drive three phase full bridge mould using charge pump
Block, the three phase full bridge module to the motor provides three-phase phase voltage.
13. control systems as any one of claim 1 to 5, it is characterised in that the power-supply controller of electric will be input into electricity
Source is converted into first voltage and second voltage, wherein, first voltage is supplied to the master controller, second voltage to be supplied to described
Power driver module.
14. control systems as claimed in claim 13, it is characterised in that the magnitude of voltage of the first voltage be 4.5V~
5.5V, the magnitude of voltage of the second voltage is 12V~15V.
15. control systems as any one of claim 1 to 5, it is characterised in that the control system is used for pilot angle
Grinding machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620991946.3U CN206180908U (en) | 2016-08-29 | 2016-08-29 | Control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620991946.3U CN206180908U (en) | 2016-08-29 | 2016-08-29 | Control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206180908U true CN206180908U (en) | 2017-05-17 |
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ID=60240672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620991946.3U Active CN206180908U (en) | 2016-08-29 | 2016-08-29 | Control system |
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| Country | Link |
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| CN (1) | CN206180908U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208840A (en) * | 2016-08-29 | 2016-12-07 | 杭州士腾科技有限公司 | Control system and control method |
| CN108418352A (en) * | 2017-07-20 | 2018-08-17 | 益航电子股份有限公司 | Motor device and motor drive circuit |
-
2016
- 2016-08-29 CN CN201620991946.3U patent/CN206180908U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208840A (en) * | 2016-08-29 | 2016-12-07 | 杭州士腾科技有限公司 | Control system and control method |
| CN108418352A (en) * | 2017-07-20 | 2018-08-17 | 益航电子股份有限公司 | Motor device and motor drive circuit |
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