CN107482981A - A kind of BSG motors field weakening control method and system - Google Patents
A kind of BSG motors field weakening control method and system Download PDFInfo
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- CN107482981A CN107482981A CN201710801213.8A CN201710801213A CN107482981A CN 107482981 A CN107482981 A CN 107482981A CN 201710801213 A CN201710801213 A CN 201710801213A CN 107482981 A CN107482981 A CN 107482981A
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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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/22—Current control, e.g. using a current control loop
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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
- H02P2205/07—Speed loop, i.e. comparison of the motor speed with a speed reference
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- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The present invention relates to BSG motor control technology fields, specially a kind of BSG motors field weakening control method and system.A kind of BSG motors field weakening control method, obtain BSG motor rotating speed of target, by BSG motor rotating speed of targetWith speed setting threshold valuesCompare, when BSG motor rotating speed of targetLess than speed setting threshold valuesWhen, by maximum torque per ampere control torque output to obtain target torque, when BSG motor rotating speed of targetMore than or equal to speed setting threshold valuesWhen, exciting current is adjusted to realize weak magnetic control and justify control mode output by current limitation to obtain target torque by adjusting excitation voltage.The present invention can realize lower reduction excitation field at a high speed by the control to excitation voltage size, reach the purpose of weak magnetism speed expansion.
Description
Technical field
The present invention relates to BSG motor control technology fields, specially a kind of BSG motors field weakening control method and system.
Background technology
As automobile fuel consumption regulation is more and more stricter, Technology of Hybrid Electric Vehicle arises at the historic moment, BSG（Belt Generator
Starter belts drive starting-generating all-in-one）The features such as motor technology is due to its high performance-price ratio and superior expansion, mixed
Close and be widely used in power vehicle.BSG motors are installed on conventional engines, are connected by belt and engine output shaft
Connect, there is fast ratio in BSG motors, such BSG working speeds need to reach 20000rpm/min or so between the two with engine, because
This BSG motor must use weak magnetic control technology to meet the speed governing demand of wide speed range.
Existing BSG motors use permagnetic synchronous motor more, because motor-field is produced by permanent magnet, rotating speed requirement compared with
Height needs the occasion of weak magnetic field operation to be difficult to.Existing weak magnetic technology realizes weak magnetism speed expansion problem all from control angle, actual
Motor mathematical model is more complicated in application process, and control chip is computationally intensive in real time, and is difficult to operate in depth weak magnetic region.
The control of BSG motors is closely related with the inverter in system, and most obvious of which is the phase voltage of motor
The limiting value Ulim and phase current virtual value Ilim of virtual value will be limited by DC side voltage of converter and maximum output current.
Then voltage limit is oval and the figure of current limitation circle is as shown in Figure 1.Voltage equation meets：；Work as motor stabilizing
Meet during operation:；Current equation meets：；BSG motor torque sides
Cheng Wei：；BSG motors use Non-Salient-Pole Motor, its Ld=Lq, therefore BSG Motor torques more
Equation can be expressed as：, wherein u is phase voltage virtual value,For d-axis, quadrature-axis voltage,For
D-axis, quadrature axis current,For d-axis, quadrature axis inductance,For phase voltage, phase current effective limit value,For forever
Magnetic magnetic linkage,For rotor number of pole-pairs,For motor electromagnetic torque.
From above-mentioned equation, motor electromagnetic torque is directly proportional to iq, unrelated with id, can make id=0 in theory to realize
Maximum torque per ampere control.But according to Fig. 1, when motor operation is in high rotating speed, by voltage limit ellipse and electric current pole
The limitation of circle is limited, motor can only operate in the region of both intersections, can only now reduce d shaft currents to weaken d direction of principal axis magnetic field
Inverse electromotive force, and q shaft currents are reduced simultaneously, to ensure that motor stator current phasor meets restriction of current.It is this by fixed
Sub- d electric currents weaken motor-field to ensure that the control of the magnetic field of high speed operation of motor is referred to as weak magnetic control.For permanent-magnet synchronous type
BSG motors, the oval central point of voltage limit (- ψ f/ Ld, 0) is likely located at outside current limitation circle, now higher
Under rotating speed, voltage limit it is oval with current limitation circle without intersection region, BSG motors can not weak magnetism speed expansion so far rotating speed.
Therefore, it is more complicated to there is weak magnetic control in prior art, and the problem of be difficult to reach the control of depth weak magnetic and shortcoming.
The content of the invention
The problem of present invention exists for prior art, it is proposed that a kind of BSG motors field weakening control method and system, can
By the control to excitation voltage size, lower reduction excitation field at a high speed is realized, reaches the purpose of weak magnetism speed expansion.
The technical solution adopted for the present invention to solve the technical problems is：A kind of BSG motors field weakening control method, obtain
BSG motor rotating speed of target, by BSG motor rotating speed of targetWith speed setting threshold valuesCompare, when BSG motor targets
Rotating speedLess than speed setting threshold valuesWhen, by maximum torque per ampere control torque output to obtain target torque, when
BSG motor rotating speed of targetMore than or equal to speed setting threshold valuesWhen, by adjust excitation voltage adjust exciting current with
Realize weak magnetic control and control mode output is justified by current limitation to obtain target torque.
Preferably, by maximum torque per ampere control torque output to obtain target torque specifically, passing through formula
（1）Obtain target torque and make=0,
（1）
Wherein,For motor electromagnetic torque,For rotor number of pole-pairs,For permanent magnet flux linkage one,For quadrature axis current.
Preferably, exciting current is adjusted to realize weak magnetic control and justify by current limitation by adjusting excitation voltage
Control mode output to obtain target torque specifically,
Pass through formula（2）Determine the oval central point of voltage limit
（2）
Wherein,For phase voltage effective limit value,For quadrature axis inductance,For quadrature axis current,,
It is to include excitation flux linkage and the rotor flux of permanent magnet flux linkage,For permanent magnet flux linkage two,For exciting current, k is constant；
By adjusting exciting currentSize adjust the oval central point of voltage limitSo that required mesh
Mark torque is not limited by voltage limit ellipse；
By current limitation circle with maximum torque per ampere control torque output to obtain target torque.
Preferably, pass through voltage grading formula（3）To adjust excitation voltageSo as to adjust exciting current,
（3）
Wherein,For voltage-regulation amount.
It is preferably, specific to obtain target torque with maximum torque per ampere control torque output by current limitation circle
To pass through formula（4）Obtain target torque,
（4）
Wherein,For motor electromagnetic torque,For rotor number of pole-pairs,For rotor flux,For quadrature axis current.
Present invention also offers a kind of BSG motors weak magnetic control system, including motor body, is electrically connected with motor body
Motor rotating speed of target acquiring unit, with motor rotating speed of target acquiring unit be electrically connected with motor rotating speed of target comparison unit,
And the control process module being electrically connected with the motor rotating speed of target comparison unit and the motor body；The electricity
Machine body includes rotating shaft, the magnet exciting coil and permanent magnet block being assemblied in the rotating shaft, is assemblied in the rotating shaft and is encouraged positioned at described
The preceding pawl pole and rear pawl pole of magnetic coil and permanent magnet block front and rear sides, and it is assemblied in the bearing and current collection of described rotating shaft one end
Ring, the magnet exciting coil are electrically connected with by the collector ring and external power source.
Preferably, the control process module includes the first control process module and the second control process module, it is described
First control process module is used to obtain target torque when motor rotating speed of target is less than speed setting threshold values, second control
Processing module is used to obtain target torque when motor rotating speed of target is more than or equal to speed setting threshold values.
Preferably, the first control process module includes target torque first acquisition unit, the target torque
One acquiring unit is used to pass through formulaTurned with reference to maximum torque per ampere control torque output with obtaining target
Square.
Preferably, the second control process module includes excitation voltage regulation unit, voltage limit elliptical center point
Adjustment unit, and target torque second acquisition unit；
The excitation voltage regulation unit is used to pass through voltage grading formulaEncouraged to adjust
Magnetoelectricity pressure is so as to adjusting exciting current；
The voltage limit elliptical center point adjustment unit is used for by the oval central point of exciting current adjustment voltage limitRequired target torque is set not limited by voltage limit ellipse；
The target torque second acquisition unit is used to pass through formulaWith reference to current limitation circle with torque capacity
Electric current is exported than control mode to obtain target torque.
Preferably, the motor body also include being assemblied in preceding fan blade that the rotating shaft be located on front side of the preceding pawl pole with
Rear fan blade on rear side of the rear pawl pole.
The invention has the advantages that
1st, weak magnetic control algolithm is simple, easily realizes；
2nd, it can realize that depth weak magnetic controls, rotating speed control is stable, out-of-control phenomenon should not occurs；
3rd, under the low speed can be in maximum output torque more in wide speed range.
Brief description of the drawings
Fig. 1 is the oval pictorial diagram with current limitation circle of the voltage limit of prior art；
Fig. 2 is a kind of logic diagram of BSG motors field weakening control method of the present invention；
Fig. 3 is the control algolithm figure of excitation voltage in a kind of BSG motors field weakening control method of the present invention；
Fig. 4 is the structural representation of motor body in a kind of BSG motors weak magnetic control system of the present invention；
Fig. 5 is the oval pictorial diagram with current limitation circle of the voltage limit of the present invention；
Wherein, 1, rotating shaft, 2, magnet exciting coil, 3, permanent magnet block, 4, preceding pawl pole, 5, rear pawl pole, 6, preceding fan blade, 7, rear fan blade, 8,
Bearing, 9, collector ring.
Embodiment
Further illustrate technical scheme below in conjunction with the accompanying drawings and by embodiment.
As shown in Fig. 2 a kind of BSG motors field weakening control method, obtains BSG motor rotating speed of target, by BSG motor mesh
Mark rotating speedWith speed setting threshold valuesCompare.
When BSG motor rotating speed of targetLess than speed setting threshold valuesWhen, pass through maximum torque per ampere control moment of torsion
Export to obtain target torque.By maximum torque per ampere control torque output to obtain target torque specifically, passing through public affairs
Formula（1）Obtain target torque and make=0,
（1）
Wherein,For motor electromagnetic torque,For rotor number of pole-pairs,For permanent magnet flux linkage one,For quadrature axis current.
When BSG motor rotating speed of targetMore than or equal to speed setting threshold valuesWhen, adjusted by adjusting excitation voltage
Exciting current is exported to obtain target torque with realizing weak magnetic control and justifying control mode by current limitation.By adjusting excitation
Voltage has to adjust exciting current to realize weak magnetic control and justify control mode output by current limitation to obtain target torque
Body is to pass through formula（2）Determine the oval central point of voltage limit
（2）
Formula（2）For motor operation when voltage equation, wherein,For phase voltage effective limit value,For quadrature axis inductance,For quadrature axis current,,It is to include excitation flux linkage and the rotor flux of permanent magnet flux linkage,For permanent-magnet magnetic
Chain two,For exciting current, k is constant.By adjusting exciting currentSize adjust the oval central point of voltage limitSo that required target torque is not limited by voltage limit ellipse.By current limitation circle with torque capacity
Electric current is exported than control mode to obtain target torque.
According to formula (2), and the oval central point of voltage limit (- ψ e/ Ld, 0）, as shown in figure 5, exciting currentChange,
The then oval central point change of voltage limit, if reducing, then voltage limit elliptical center point to the origin of coordinates move, compared to
The oval central point of Fig. 1 voltage (- ψ f/ Ld, 0）Closer to origin.Such as motor operation rotating speed is ω 1, now if to obtain
Torque capacity is obtained, shown in Fig. 1, is limited by voltage limit ellipse, BSG motors need to carry out weak magnetic control, and id electric currents need to reduce
For-b, justify according to current limitation and limit, iq electric currents need to be reduced to a, and control is complicated.According to present context, only need to reduce, voltage limit ellipse is moved to origin, as shown in figure 5, operating under the rotating speeds of ω 1, do not limited by voltage limit now, this
When can obtain higher torque according to maximum torque per ampere control.
By current limitation circle with maximum torque per ampere control torque output to obtain target torque specifically, passing through public affairs
Formula（4）Obtain target torque,
（4）
Wherein,For motor electromagnetic torque,For rotor number of pole-pairs,For rotor flux,For quadrature axis current.
As shown in figure 3, voltage grading formula can be passed through（3）To adjust excitation voltageSo as to adjust exciting current,
（3）
Wherein,For voltage-regulation amount.
A kind of BSG motors weak magnetic control system, including motor body, the motor rotating speed of target being electrically connected with motor body
Acquiring unit, with motor rotating speed of target acquiring unit be electrically connected with motor rotating speed of target comparison unit, and with the motor
The control process module that rotating speed of target comparison unit and the motor body are electrically connected.
As shown in figure 4, the motor body includes rotating shaft 1, the magnet exciting coil 2 and permanent-magnet magnetic being assemblied in the rotating shaft 1
Block 3, preceding pawl pole 4 and rear pawl pole 5 that the rotating shaft 1 is located at the magnet exciting coil 2 and the front and rear sides of permanent magnet block 3 are assemblied in, filled
The rotating shaft 1 is fitted over positioned at the preceding fan blade 6 of the preceding front side of pawl pole 4 and the rear fan blade 7 positioned at the rear rear side of pawl pole 5, and
The bearing 8 and collector ring 9 of described one end of rotating shaft 1 are assemblied in, the magnet exciting coil 2 passes through the collector ring 9 and external power source electricity
Property connection.
Preceding fan blade 6, rear fan blade 7 produce air-flow as rotating shaft 1 rotates, and motor body is radiated.Bearing 8 plays support and made
With.Magnet exciting coil 2 is connected by collector ring 9 with external power source circuit, after magnet exciting coil 2 is powered, intensifies preceding pawl pole 4, rear pawl pole 5
N, S magnetic field are produced, permanent magnet block 3 is installed, to strengthen magnetic field intensity, excitation field magnetic induction intensity between preceding pawl pole 4, rear pawl pole 5
It is directly proportional to exciting current size, the magnetic induction of excitation field is adjusted by adjusting the size of exciting current, permanent magnet block
Magnetic induction intensity is relevant with material, is fixed value.
The control process module includes the first control process module and the second control process module, at first control
Reason module is used to obtain target torque when motor rotating speed of target is less than speed setting threshold values, and the second control process module is used
Target torque when obtaining motor rotating speed of target and being more than or equal to speed setting threshold values.
The first control process module includes target torque first acquisition unit, the target torque first acquisition unit
For passing through formulaWith reference to maximum torque per ampere control torque output to obtain target torque.
The second control process module includes excitation voltage regulation unit, voltage limit elliptical center point adjustment unit, and
Target torque second acquisition unit.The excitation voltage regulation unit is used to pass through voltage grading formula
To adjust excitation voltage so as to adjust exciting current.The voltage limit elliptical center point adjustment unit is used to pass through exciting current
Adjust the oval central point of voltage limitRequired target torque is set not limited by voltage limit ellipse.Institute
Target torque second acquisition unit is stated to be used to pass through formulaWith reference to current limitation circle with torque capacity electric current ratio
Control mode is exported to obtain target torque.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the design of the present invention
It is defined with scope.On the premise of design concept of the present invention is not departed from, technical side of the ordinary people in the field to the present invention
The all variations and modifications that case is made, all should drop into protection scope of the present invention, the claimed technology contents of the present invention,
Through all recording in detail in the claims.
Claims (10)
- A kind of 1. BSG motors field weakening control method, it is characterised in that：Obtain BSG motor rotating speed of target, by BSG motor targets Rotating speedWith speed setting threshold valuesCompare, when BSG motor rotating speed of targetLess than speed setting threshold valuesWhen, lead to Maximum torque per ampere control torque output is crossed to obtain target torque, when BSG motor rotating speed of targetSet more than or equal to rotating speed Determine threshold valuesWhen, controlled by adjusting excitation voltage to adjust exciting current with realizing weak magnetic control and being justified by current limitation Torque output is to obtain target torque.
- A kind of 2. BSG motors field weakening control method according to claim 1, it is characterised in that：Pass through torque capacity electric current Exported than control mode to obtain target torque specifically, passing through formula（1）Obtain target torque and make=0,（1）Wherein,For motor electromagnetic torque,For rotor number of pole-pairs,For permanent magnet flux linkage one,For quadrature axis current.
- A kind of 3. BSG motors field weakening control method according to claim 1, it is characterised in that：By adjusting excitation voltage Come adjust exciting current with realize weak magnetic control and by current limitation justify control mode output to obtain target torque specifically,Pass through formula（2）Determine the oval central point of voltage limit（2）Wherein,For phase voltage effective limit value,For quadrature axis inductance,For quadrature axis current,,For Rotor flux including excitation flux linkage and permanent magnet flux linkage,For permanent magnet flux linkage two,For exciting current, k is constant；By adjusting exciting currentSize adjust the oval central point of voltage limitSo that required mesh Mark torque is not limited by voltage limit ellipse；By current limitation circle with maximum torque per ampere control torque output to obtain target torque.
- A kind of 4. BSG motors field weakening control method according to claim 3, it is characterised in that：Pass through voltage grading formula （3）To adjust excitation voltageSo as to adjust exciting current,（3）Wherein,For voltage-regulation amount.
- A kind of 5. BSG motors field weakening control method according to claim 4, it is characterised in that：By current limitation circle with Maximum torque per ampere control torque output is to obtain target torque specifically, passing through formula（4）Obtain target torque,（4）Wherein,For motor electromagnetic torque,For rotor number of pole-pairs,For rotor flux,For quadrature axis current.
- A kind of 6. BSG motors weak magnetic control system, it is characterised in that：Including motor body, the electricity being electrically connected with motor body Machine rotating speed of target acquiring unit, the motor rotating speed of target comparison unit being electrically connected with motor rotating speed of target acquiring unit, and The control process module being electrically connected with the motor rotating speed of target comparison unit and the motor body；The motor sheet Body includes rotating shaft（1）, it is assemblied in the rotating shaft（1）On magnet exciting coil（2）And permanent magnet block（3）, it is assemblied in the rotating shaft（1） Positioned at the magnet exciting coil（2）And permanent magnet block（3）The preceding pawl pole of front and rear sides（4）With rear pawl pole（5）, and be assemblied in described Rotating shaft（1）The bearing of one end（8）And collector ring（9）, the magnet exciting coil（2）Pass through the collector ring（9）With external power source electricity Property connection.
- A kind of 7. BSG motors weak magnetic control system according to claim 6, it is characterised in that：The control process module Including the first control process module and the second control process module, the first control process module is used to obtain motor target turn Target torque when speed is less than speed setting threshold values, the second control process module be used to obtaining motor rotating speed of target more than etc. Target torque when speed setting threshold values.
- A kind of 8. BSG motors weak magnetic control system according to claim 7, it is characterised in that：First control process Module includes target torque first acquisition unit, and the target torque first acquisition unit is used to pass through formula With reference to maximum torque per ampere control torque output to obtain target torque.
- A kind of 9. BSG motors weak magnetic control system according to claim 7, it is characterised in that：Second control process Module includes excitation voltage regulation unit, voltage limit elliptical center point adjustment unit, and target torque second acquisition unit；The excitation voltage regulation unit is used to pass through voltage grading formulaEncouraged to adjust Magnetoelectricity pressure is so as to adjusting exciting current；The voltage limit elliptical center point adjustment unit is used for by the oval central point of exciting current adjustment voltage limitRequired target torque is set not limited by voltage limit ellipse；The target torque second acquisition unit is used to pass through formulaWith reference to current limitation circle with torque capacity Electric current is exported than control mode to obtain target torque.
- A kind of 10. BSG motors weak magnetic control system according to claim 6, it is characterised in that：The motor body also wraps Include and be assemblied in the rotating shaft（1）Positioned at the preceding pawl pole（4）The preceding fan blade of front side（6）With the pawl pole after described（5）Rear side Fan blade afterwards（7）.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710801213.8A CN107482981A (en) | 2017-09-07 | 2017-09-07 | A kind of BSG motors field weakening control method and system |
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| CN201710801213.8A CN107482981A (en) | 2017-09-07 | 2017-09-07 | A kind of BSG motors field weakening control method and system |
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