CN105515489A - Method and device for controlling motor rotation speed - Google Patents
Method and device for controlling motor rotation speed Download PDFInfo
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- CN105515489A CN105515489A CN201610042264.2A CN201610042264A CN105515489A CN 105515489 A CN105515489 A CN 105515489A CN 201610042264 A CN201610042264 A CN 201610042264A CN 105515489 A CN105515489 A CN 105515489A
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- electric current
- current loop
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- reference value
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2205/00—Indexing scheme relating to controlling arrangements characterised by the control loops
- H02P2205/01—Current loop, i.e. comparison of the motor current with a current reference
Abstract
The invention discloses a method and device for controlling motor rotation speed. The method comprises the steps of obtaining the current rotation speed of a motor, determining current loop reference value according to the current rotation speed and a set maximum rotation speed, obtaining a three-phase current of the motor, performing proportion-integral calculation according to the three-phase current and the current loop reference value to obtain a current loop output value, and determining motor driving signals for controlling the motor rotation speed according to the current loop output value. According to the method and device, the adjustment of the motor rotation speed of an intelligent appliance having air volume requirements, such as a kitchen ventilator is achieved, and the effect that the load is changed when outside air pressure changes and the motor rotation speed is adjusted automatically to meet the requirements of the air volume is achieved. According to the method and the device, when the outside air pressure changes, the motor rotation speed is stabilized at a maximum rotation speed, the function of meeting the noise requirements is achieved, and the effect of stable operation of the motor under the conditions of idle load or light load is achieved.
Description
Technical field
The embodiment of the present invention relates to automatic control technology, particularly relates to a kind of motor speed control method and device.
Background technology
Along with the development of society, people more and more pay attention to the energy-conserving and environment-protective performance of electrical equipment and intelligent performance.In order to ensure the requirements such as intelligent electric appliance meets stable, energy-conserving and environment-protective and noise is low, designer has made a large amount of effort.
At present, starting with in a lot of designer air quality indoor, energy-conserving and environment-protective and the aspect such as intelligent, improves intelligent electric appliance.Such as number of patent application be 201410143579.7 application documents disclose a kind of smoke exhaust ventilator permanent wind amount method for noise reduction control and system thereof.The scheme of this application file discloses by judging whether current motor rotating speed is greater than the maximum speed pre-set, if current motor rotating speed is greater than the maximum speed pre-set, rotating speed is reduced, to realize the function controlling motor speed and reduce noise by the mode directly adjusting electric current.But technical scheme disclosed in this application file is when underloading or zero load, and motor very easily occurs the fluctuation of speed, affects motor performance.
Summary of the invention
The invention provides a kind of motor speed control method and device, to realize stable motor speed, reduce complete machine noise, promote the function of users'comfort.
First aspect, embodiments provides a kind of motor speed control method, comprising:
Obtain the current rotating speed of motor, according to described current rotating speed and setting maximum speed determination electric current loop reference value;
Obtain the three-phase current of motor, carry out proportional integral computing according to described three-phase current and described electric current loop reference value and obtain electric current loop output valve;
The motor drive signal controlling motor speed is determined according to described electric current loop output valve.
Second aspect, the embodiment of the present invention additionally provides a kind of motor speed control device, and this device comprises:
Electric current loop reference value determining unit, for obtaining the current rotating speed of motor, according to described current rotating speed and setting maximum speed determination electric current loop reference value;
Electric current loop output valve determining unit, for obtaining the three-phase current of motor, carrying out proportional integral computing according to described three-phase current and described electric current loop reference value and obtaining electric current loop output valve;
Motor drive signal determining unit, for determining the motor drive signal controlling motor speed according to described electric current loop output valve.
The present invention passes through the current rotating speed obtaining motor, according to described current rotating speed and setting maximum speed determination electric current loop reference value; Obtain the three-phase current of motor, carry out proportional integral computing according to described three-phase current and described electric current loop reference value and obtain electric current loop output valve; The motor drive signal controlling motor speed is determined according to described electric current loop output valve.The present invention solves the motor speed regulable control problem that lampblack absorber class has the intelligent electric appliance of air quantity requirement, and realize when external wind pressure change causes load variations, electric machine controller self-regulation motor rotating speed is to ensure the effect meeting air quantity demand; The invention also achieves when external wind pressure changes, motor speed is stabilized in maximum (top) speed by electric machine controller, and then meets the function of noise requirements; Reach the effect that motor is stable under zero load or underloading condition.
Accompanying drawing explanation
Fig. 1 is the flow chart of a kind of motor speed control method in the embodiment of the present invention one;
Fig. 2 a is the flow chart of a kind of motor speed control method medium speed protection step in the embodiment of the present invention two;
Fig. 2 b is the flow chart of a kind of motor speed control method medium speed regulating step in the embodiment of the present invention two;
Fig. 3 a is the flow chart of a kind of motor speed control method medium speed protection step in the embodiment of the present invention three;
Fig. 3 b is the flow chart of a kind of motor speed control method medium speed regulating step in the embodiment of the present invention three;
Fig. 4 is the structural representation of a kind of motor speed control device in the embodiment of the present invention four.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, illustrate only part related to the present invention in accompanying drawing but not entire infrastructure.
Embodiment one
The flow chart of a kind of motor speed control method that Fig. 1 provides for the embodiment of the present invention one, when the present embodiment is applicable to external wind pressure change, the situation that motor automatically adjusts to rotating speed, the method can be performed by motor speed control device, specifically comprises the steps:
The current rotating speed of step 110, acquisition motor, according to described current rotating speed and setting maximum speed determination electric current loop reference value.
Wherein, motor speed is the angular speed of rotor.Described current rotating speed is the angular speed of sampling instant rotor.Preferably, the current rotating speed obtaining motor comprises the current angular obtaining rotor, determines described current rotating speed according to described current angular.The angle of interval residing for motor operation course rotor and correspondence can be detected, with electrical degree desirable under obtaining this hall position by Hall element.Can determine the instantaneous angular velocity that this hall position is corresponding to be current rotating speed to the integration of time by described electrical degree.Optionally, the electrical degree that position-sensor-free determination rotor is desirable under current location can also be utilized.
Described setting maximum speed is the maximum (top) speed of current motor.Using the reference value of described setting maximum speed as der Geschwindigkeitkreis, regulate current rotating speed according to described setting maximum speed, make current stabilization of speed near the value of described setting maximum speed to reach, realize rotating speed defencive function, and then meet noise requirements.Using regulate current rotating speed to obtain according to described setting maximum speed regulated value as electric current loop reference value I
sRefcarry out proportional integral (PI) computing.
The three-phase current of step 120, acquisition motor, carries out proportional integral computing according to described three-phase current and described electric current loop reference value and obtains electric current loop output valve.
Wherein, the three-phase current of motor is the electric current on motor threephase stator winding.Sampling resistor can be connected with the stator winding of motor, be determined electric current I a, Ib and Ic of motor threephase stator winding by the electric current that calculating sampling resistance passes through respectively.Preferably, after obtaining the electric current on motor threephase stator winding, coordinate transform is carried out to electric current I a, Ib and Ic of described threephase stator winding and obtains biphase current, described biphase current and electric current loop reference value are carried out proportional integral computing and obtains electric current loop output valve.Such as, due to electric current I a, Ib and Ic of electrical degree corresponding to known current hall position, motor threephase stator winding, electric current I a, Ib and Ic of motor threephase stator winding in rectangular coordinate system be converted into d axle under rotating coordinate system and q shaft current component i according to Clarke (Clarke) and Parker (Park) conversion
dand i
q.Calculate d shaft current component i
dwith the electric current loop reference value Id of setting
refdeparture, proportional integral (PI) computing is carried out to described departure and obtains d shaft voltage component V
d.By the electric current loop reference value I determined in above-mentioned steps
sRefas the electric current loop reference value Iq of q shaft current component
ref, calculate q shaft current component i
qwith electric current loop reference value Iq
refdeparture, proportional integral (PI) computing is carried out to described departure and obtains q shaft voltage component V
q.By above-mentioned d shaft voltage component V
dand q shaft voltage component V
qas electric current loop output valve.
Step 130, determine controlling the motor drive signal of motor speed according to described electric current loop output valve.
Wherein, the drive singal of described motor is the adjustable pulse signal of duty ratio, can adjust motor speed by the duty ratio of regulating impulse signal.Preferably, after acquisition electric current loop output valve, the voltage signal that coordinate inversion obtains threephase stator winding is carried out to described electric current loop output valve.The motor drive signal controlling motor speed is determined according to the voltage signal of described threephase stator winding.Such as, due to electrical degree, d shaft voltage component V that known current hall position is corresponding
dwith q shaft voltage component V
q, by Parker (Park) inverse transformation by the q shaft voltage component V under rotating coordinate system
qwith d shaft voltage component V
dbe converted into the α shaft voltage component V under two axle orthogonal coordinate systems
αwith β shaft voltage component V
β.Then, by Clarke (Clarke) inverse transformation by the α shaft voltage component V under two axle orthogonal coordinate systems
αwith β shaft voltage component V
βbe converted into a shaft voltage component Va, b shaft voltage Vb and c-axis component of voltage Vc in rectangular coordinate system.By space vector width pulse modulation method (SVPWM), the pulse signal obtained for controlling motor speed being modulated to described a shaft voltage component Va, b shaft voltage Vb and c-axis component of voltage Vc, running according to the rotating speed determined according to described pulse signal drive motors.Wherein, the rotating speed of motor is determined by the duty ratio of described pulse signal.
The technical scheme of the present embodiment, by obtaining the current rotating speed of motor, according to described current rotating speed and setting maximum speed determination electric current loop reference value; Obtain the three-phase current of motor, carry out proportional integral computing according to described three-phase current and described electric current loop reference value and obtain electric current loop output valve; The motor drive signal controlling motor speed is determined according to described electric current loop output valve.The technical scheme of the present embodiment solves the motor speed regulable control problem of the intelligent electric appliance that lampblack absorber class has air quantity to require, realize when external wind pressure change causes load variations, self-regulation motor rotating speed is to ensure the effect meeting air quantity demand; The invention also achieves when external wind pressure changes, motor speed is stabilized in maximum (top) speed, and then meet the function of noise requirements; Reach the effect that motor is stable under zero load or underloading condition.
Embodiment two
Fig. 2 a is the flow chart of a kind of motor speed control method medium speed protection step in the embodiment of the present invention two.The technical scheme of the present embodiment, on the basis of above-described embodiment, further defines according to the mode of described current rotating speed with setting maximum speed determination electric current loop reference value, specifically comprises the steps:
The current rotating speed of step 210, acquisition motor.
Hall element is fixed on the silicon steel sheet of stator core, and is electrically connected with electric machine controller.Electric machine controller can determine the angle of interval residing for motor operation course rotor and correspondence by described Hall element, with electrical degree desirable under obtaining this hall position.Such as, electric machine controller is in 60 ° of-120 ° of intervals by Hall element determination rotor is current, and corresponding angle is 150 °, then using 150 ° of electrical degrees desirable under this hall position.Can determine the instantaneous angular velocity that this hall position is corresponding to be current rotating speed to the integration of time by described electrical degree.In addition, reflection method, magnetoelectricity method, raster method and position-sensor-free etc. can also be utilized to obtain the current rotating speed of rotor.
Step 220, by current rotating speed with setting maximum speed carry out PI computing.
Using the maximum speed that presets as the reference value of proportional integral (PI) computing, calculated the departure of current rotating speed and described setting maximum speed by electric machine controller.
Step 230, using the result of PI computing as electric current loop maximum target value.
Using above-mentioned departure as electric current loop maximum target value.
Step 240, judge whether electric current loop target setting value is greater than electric current loop maximum target value, if so, then perform step 250, if not, then perform step 260.
Wherein, electric current loop target setting value is given by der Geschwindigkeitkreis, by the output valve of der Geschwindigkeitkreis as the target setting value of electric current loop.Further, the span of electric current loop target setting value is between motor maximum sustainable operation electric current and minimum sustainable operation electric current.Relatively this electric current loop target setting value and described electric current loop maximum target value.If described electric current loop target setting value is greater than described electric current loop maximum target value, then perform step 250; If described electric current loop target setting value is less than or equal to described electric current loop maximum target value, then perform step 260.
Step 250, electric current loop maximum target value is carried out PI computing as electric current loop reference value.
To be sampled by current of electric and coordinate transform obtains the q shaft current component i of current of electric
qwith d shaft current component i
d.When described electric current loop target setting value is greater than described electric current loop maximum target value, electric current loop maximum target value is as the electric current loop reference value Iq of q shaft current component
ref, by electric current loop reference value Iq
refwith described q shaft current component i
qcarry out proportional integral (PI) computing.Shown in Fig. 2 b, calculate q shaft current component i
qwith electric current loop reference value Iq
refdeparture, proportional integral (PI) computing is carried out to described departure and obtains q shaft voltage component V
q.Calculate d shaft current component i
dwith the electric current loop reference value Id of setting
refdeparture, proportional integral (PI) computing is carried out to described departure and obtains d shaft voltage component V
d.Due to electrical degree, d shaft voltage component V that known current hall position is corresponding
dwith q shaft voltage component V
q, by a shaft voltage component Va, b shaft voltage Vb and c-axis component of voltage Vc in Parker's (Park) inverse transformation and Clarke (Clarke) inverse transformation determination rectangular coordinate system.By space vector width pulse modulation method (SVPWM), the pulse signal obtained for controlling motor speed being modulated to described a shaft voltage component Va, b shaft voltage Vb and c-axis component of voltage Vc, running according to the rotating speed determined according to described pulse signal drive motors.Wherein, the rotating speed of motor is determined by the duty ratio of described pulse signal.
Step 260, electric current loop target setting value is carried out PI computing as electric current loop reference value.
To be sampled by current of electric and coordinate transform obtains the q shaft current component i of current of electric
qwith d shaft current component i
d.When described electric current loop target setting value is less than or equal to described electric current loop maximum target value, using the electric current loop reference value Iq of described electric current loop target setting value as q shaft current component
ref, by electric current loop reference value Iq
refwith described q shaft current component i
qcarry out proportional integral (PI) computing.Then, carrying out according to the result of comparative example integral operation the pulse signal that coordinate inversion and space vector pulse width modulation (SVPWM) obtain for controlling motor speed, running according to the rotating speed determined according to described pulse signal drive motors.Wherein, the rotating speed of motor is determined by the duty ratio of described pulse signal.Concrete proportional integral calculating process, coordinate inversion process and pulse-width modulation process are identical with step 250, repeat no more herein.
The technical scheme of the present embodiment, sampled by current of electric and calculate current motor run electric current, above-mentioned electric current and electric current loop target setting electric current are made comparisons, make motor stabilizing operate in electric current loop target setting electric current.When external wind pressure becomes large, because current of electric is constant, load lightens, and electric machine controller can improve motor speed automatically, to ensure to meet air quantity demand.Further, when external wind pressure reduces, electric machine controller can reduce motor speed automatically, to ensure to meet air quantity demand.Meanwhile, limiting motor rotating speed levels off to setting maximum speed, and then meets noise requirements.
Embodiment three
Fig. 3 a is the flow chart of a kind of motor speed control method medium speed protection step in the embodiment of the present invention three.The technical scheme of the present embodiment, on the basis of above-described embodiment, further defines according to described current rotating speed and setting maximum speed determination electric current loop reference value, specifically comprises the steps:
The current rotating speed of step 310, acquisition motor.
The angle of interval residing for motor operation course rotor and correspondence can be determined, with electrical degree desirable under obtaining this hall position by described Hall element.Concrete computational process is same as the previously described embodiments, repeats no more herein.
Step 320, judge whether current rotating speed is greater than setting maximum speed, if so, then perform step 330, if not, then perform step 310.
Current rotating speed and setting maximum speed compare by electric machine controller.When current rotating speed is greater than setting maximum speed, perform step 330; When current rotating speed is less than or equal to setting maximum speed, returns and perform step 310.
Step 330, enter speed closed loop state of a control, by carrying out the output valve of proportional integral computing determination der Geschwindigkeitkreis to described current rotating speed.
Electric machine controller enters speed closed loop state of a control, shown in Fig. 3 b, calculate current rotating speed and the departure setting maximum speed, carry out to described departure the output valve that proportional integral computing (PI) obtains der Geschwindigkeitkreis, this output valve is electric current loop reference value Iq
ref.
Step 340, the output valve of described der Geschwindigkeitkreis is carried out PI computing as electric current loop reference value.
Shown in Fig. 3 b, to be sampled by current of electric and coordinate transform obtains the q shaft current component i of current of electric
qwith d shaft current component i
d.Calculate q shaft current component i
qwith electric current loop reference value Iq
refdeparture, proportional integral (PI) computing is carried out to described departure and obtains q shaft voltage component V
q.Calculate d shaft current component i
dwith the electric current loop reference value Id of setting
refdeparture, proportional integral (PI) computing is carried out to described departure and obtains d shaft voltage component V
d.Due to electrical degree, d shaft voltage component V that known current hall position is corresponding
dwith q shaft voltage component V
q, by a shaft voltage component Va, b shaft voltage Vb and c-axis component of voltage Vc in Parker's (Park) inverse transformation and Clarke (Clarke) inverse transformation determination rectangular coordinate system.By space vector width pulse modulation method (SVPWM), the pulse signal obtained for controlling motor speed being modulated to described a shaft voltage component Va, b shaft voltage Vb and c-axis component of voltage Vc, running according to the rotating speed determined according to described pulse signal drive motors.Wherein, the rotating speed of motor is determined by the duty ratio of described pulse signal.
The technical scheme of the present embodiment, by limiting motor rotating speed below setting maximum speed, and then meets noise requirements.Meanwhile, control motor and automatically adjust rotating speed when external wind pressure changes, meet air quantity demand.
Embodiment four
Fig. 4 is the structural representation of a kind of motor speed control device in the embodiment of the present invention four.This device comprises:
Electric current loop reference value determining unit 410, for obtaining the current rotating speed of motor, according to described current rotating speed and setting maximum speed determination electric current loop reference value;
Electric current loop output valve determining unit 420, for obtaining the three-phase current of motor, carrying out proportional integral computing according to described three-phase current and described electric current loop reference value and obtaining electric current loop output valve;
Motor drive signal determining unit 430, for determining the motor drive signal controlling motor speed according to described electric current loop output valve.
The technical scheme of the present embodiment, obtains the current rotating speed of motor by electric current loop reference value determining unit 410, according to described current rotating speed and setting maximum speed determination electric current loop reference value; Obtained the three-phase current of motor by electric current loop output valve determining unit 420, carry out proportional integral computing according to described three-phase current and described electric current loop reference value and obtain electric current loop output valve; And adopt motor drive signal determining unit 430 to determine controlling the motor drive signal of motor speed according to described electric current loop output valve.The technical scheme of the present embodiment solves the motor speed regulable control problem of the intelligent electric appliance that lampblack absorber class has air quantity to require, realize when external wind pressure change causes load variations, self-regulation motor rotating speed is to ensure the effect meeting air quantity demand; The invention also achieves when external wind pressure changes, motor speed is stabilized in maximum (top) speed, and then meet the function of noise requirements; Reach the effect that motor is stable under zero load or underloading condition.
Further, described electric current loop reference value determining unit 410 specifically for:
Obtain the current angular of rotor, determine described current rotating speed according to described current angular.
Further, described electric current loop reference value determining unit 410 specifically for:
Described current rotating speed is carried out proportional integral computing with setting maximum speed and obtains electric current loop maximum target value;
Determine that parameter less in described electric current loop maximum target value and electric current loop target setting value is electric current loop reference value; Or,
Described current rotating speed and setting maximum speed are compared;
When current rotating speed is greater than setting maximum speed, enter speed closed loop state of a control, by carrying out the output valve of proportional integral computing determination der Geschwindigkeitkreis to described current rotating speed;
According to the output valve determination electric current loop reference value of described der Geschwindigkeitkreis.
Further, described electric current loop output valve determining unit 420, comprising:
Electric current obtains subelement, for obtaining the electric current on motor threephase stator winding;
Electric current loop output valve determination subelement, obtaining biphase current for carrying out coordinate transform to described electric current, described biphase current and electric current loop reference value being carried out proportional integral computing and obtains electric current loop output valve.
Further, described electric current loop output valve determination subelement specifically for:
The voltage signal that coordinate inversion obtains threephase stator winding is carried out to described electric current loop output valve;
The motor drive signal controlling motor speed is determined according to the voltage signal of described threephase stator winding.
Above-mentioned motor speed control device can perform the motor speed control method that any embodiment of the present invention provides, and possesses the corresponding functional module of manner of execution and beneficial effect.
Note, above are only preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute and can not protection scope of the present invention be departed from.Therefore, although be described in further detail invention has been by above embodiment, the present invention is not limited only to above embodiment, when not departing from the present invention's design, can also comprise other Equivalent embodiments more, and scope of the present invention is determined by appended right.
Claims (10)
1. a motor speed control method, is characterized in that, comprising:
Obtain the current rotating speed of motor, according to described current rotating speed and setting maximum speed determination electric current loop reference value;
Obtain the three-phase current of motor, carry out proportional integral computing according to described three-phase current and described electric current loop reference value and obtain electric current loop output valve;
The motor drive signal controlling motor speed is determined according to described electric current loop output valve.
2. method according to claim 1, is characterized in that, obtains the current rotating speed of motor, comprising:
Obtain the current angular of rotor, determine described current rotating speed according to described current angular.
3. method according to claim 1, is characterized in that, according to described current rotating speed and setting maximum speed determination electric current loop reference value, comprising:
Described current rotating speed is carried out proportional integral computing with setting maximum speed and obtains electric current loop maximum target value;
Determine that parameter less in described electric current loop maximum target value and electric current loop target setting value is electric current loop reference value; Or,
Described current rotating speed and setting maximum speed are compared;
When current rotating speed is greater than setting maximum speed, enter speed closed loop state of a control, by carrying out the output valve of proportional integral computing determination der Geschwindigkeitkreis to described current rotating speed;
According to the output valve determination electric current loop reference value of described der Geschwindigkeitkreis.
4. method according to claim 1, is characterized in that, obtains the three-phase current of motor, carries out proportional integral computing and obtain electric current loop output valve, comprising according to described three-phase current and described electric current loop reference value:
Obtain the electric current on motor threephase stator winding;
Coordinate transform is carried out to described electric current and obtains biphase current, described biphase current and electric current loop reference value are carried out proportional integral computing and obtains electric current loop output valve.
5. method according to claim 4, is characterized in that, the described motor drive signal determining control motor speed according to described electric current loop output valve, comprising:
The voltage signal that coordinate inversion obtains threephase stator winding is carried out to described electric current loop output valve;
The motor drive signal controlling motor speed is determined according to the voltage signal of described threephase stator winding.
6. a motor speed control device, is characterized in that, comprising:
Electric current loop reference value determining unit, for obtaining the current rotating speed of motor, according to described current rotating speed and setting maximum speed determination electric current loop reference value;
Electric current loop output valve determining unit, for obtaining the three-phase current of motor, carrying out proportional integral computing according to described three-phase current and described electric current loop reference value and obtaining electric current loop output valve;
Motor drive signal determining unit, for determining the motor drive signal controlling motor speed according to described electric current loop output valve.
7. device according to claim 6, is characterized in that, described electric current loop reference value determining unit specifically for:
Obtain the current angular of rotor, determine described current rotating speed according to described current angular.
8. device according to claim 6, is characterized in that, described electric current loop reference value determining unit specifically for:
Described current rotating speed is carried out proportional integral computing with setting maximum speed and obtains electric current loop maximum target value;
Determine that parameter less in described electric current loop maximum target value and electric current loop target setting value is electric current loop reference value; Or,
Described current rotating speed and setting maximum speed are compared;
When current rotating speed is greater than setting maximum speed, enter speed closed loop state of a control, by carrying out the output valve of proportional integral computing determination der Geschwindigkeitkreis to described current rotating speed;
According to the output valve determination electric current loop reference value of described der Geschwindigkeitkreis.
9. device according to claim 6, is characterized in that, described electric current loop output valve determining unit, comprising:
Electric current obtains subelement, for obtaining the electric current on motor threephase stator winding;
Electric current loop output valve determination subelement, obtaining biphase current for carrying out coordinate transform to described electric current, described biphase current and electric current loop reference value being carried out proportional integral computing and obtains electric current loop output valve.
10. device according to claim 9, is characterized in that, described electric current loop output valve determination subelement specifically for:
The voltage signal that coordinate inversion obtains threephase stator winding is carried out to described electric current loop output valve;
The motor drive signal controlling motor speed is determined according to the voltage signal of described threephase stator winding.
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