CN103607154A - Method for controlling AC motor capable of electrical excitation - Google Patents
Method for controlling AC motor capable of electrical excitation Download PDFInfo
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- CN103607154A CN103607154A CN201310558030.XA CN201310558030A CN103607154A CN 103607154 A CN103607154 A CN 103607154A CN 201310558030 A CN201310558030 A CN 201310558030A CN 103607154 A CN103607154 A CN 103607154A
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Abstract
The invention provides a method for controlling an AC motor capable of electrical excitation, and relates to a control method at a generating and electric state. The following apparatus is applied in the method. The apparatus comprises four parts, i.e., an excitation loop, a motor, a current transformer and a controller. The input of the excitation loop is a DC power source; the output of the excitation loop is connected with the motor through the excitation winding of the motor; the input and output connection modes of the excitation loop are direct connection through a complete-control type switch element or half-bridge connection composed of two complete-control type switch elements or H-bridge connection composed of four complete-control type switch elements; the AC side of the current transformer is connected with the three-phase winding of the motor; the DC side of the current transformer is connected with a load/ a power source; the controller, through an instantaneous working point parameter inputted by a pin and an efficiency characteristic curve stored internally, determines the most efficient work point, and taking the corresponding value of the most efficient work point as a given value of a subsequent PI regulator; and the controller controls the switch element in the current transformer to be switched on or switched off. By using the method provided by the invention, the total controllable loss of the motor can be reduced.
Description
Technical field
The present invention relates to the control method under generating and motoring condition for motor that can electric excitation, controlled rectification/inversion and the excitation control method of motor that especially can electric excitation to three-phase, can realize the efficient operation of motor.
Background technology
Rectifier is for changing alternating voltage into direct voltage.Conventional rectifier adopts diode as rectifier cell, but its conduction voltage drop is large, and uncontrollable, can cause larger rectifier loss.For this defect, now occurred that relevant controlled rectification technology adopts the full-controlled switching element that can control its on/off to reduce rectifier loss.Such element characteristic is that conduction voltage drop is low, and by the control of this class component can be realized the amplitude of DC voltage/electric current is controlled, phase place, waveform, the amplitude that also can realize AC voltage/current are controlled, and then realize the reduction of rectifier loss.Yet controlled rectification technology not only can realize the control to direct voltage, also not only can reduce rectifier loss, meanwhile, according to the above-mentioned impact of the voltage and current on direct current, interchange, controlled rectification also affects the copper loss of motor largely.Especially, copper loss, iron loss, these controlled losses of rectifier loss occupy very big proportion in motor total losses.Separately, inversion transformation technique also has as above identical conclusion.
Traditional vehicle by Excitation Controller for Synchronous Generator only for DC voltage stability effect.Yet exciting current affects the close distribution of magnetic and the magnetic circuit saturated conditions of motor internal, can affect to a great extent iron loss and the electromotive force of motor, and then have influence on electric current and the copper loss of winding.
Summary of the invention
The object of the invention is to provide a kind of AC Motor Control method that can electric excitation, it is characterized in that, application is as lower device, and this device comprises: energized circuit 1, motor 2, current transformer 3, controller 4 four parts;
Energized circuit 1 be input as DC power supply U
e, output is connected with motor 2 by the excitation winding 14 of motor 2; The input of energized circuit 1 and output connected mode are to connect by the half-bridge connection that a full-controlled switching element is directly connected or two full-controlled switching elements form or the H bridging of four full-controlled switching element compositions;
The DC voltage U that comprises current transformer 3 when the input of controller 4
dCtime, voltage sensor element of DC side parallel of current transformer 3, the output of voltage sensor element connects an input pin 51 of controller 4;
The DC side electric current I that comprises current transformer 3 when the input of controller 4
dCtime, the DC side of current transformer 3 is installed a current sensing, and the output of current sensing connects an input pin 51 of controller 4;
When three-phase current that the input of controller 4 comprises motor 2, three phase windings of motor 2 are installed current sensing, and the output of current sensing connects three input pins 51 of controller 4;
When the input of controller 4 comprises the exciting current I in energized circuit 1
ftime, current sensing is arranged in energized circuit 1, and the output of current sensing connects an input pin 51 of controller 4;
When the input of controller 4 comprises motor 2 rotor-positions or rotating speed, position sensing element is installed in motor 2, and the output of position transducer connects an input pin 51 of controller 4;
During the phase voltage of three phase windings that comprise motor 2 when the input of controller 4, three phase windings of motor 2 and three voltage sensor elements join, wherein, each phase winding is connected with an input of a voltage sensor element, the neutral point of three phase windings is connected with another reference input of voltage sensor element, and the output of each voltage sensor element is connected with an input pin 51 of controller 4;
During the line voltage of three phase windings that comprise motor 2 when the input of controller 4, three phase windings of motor 2 and three voltage sensor elements join, wherein, two-phase in three phase windings is connected with two inputs of voltage sensor element, and the output of each voltage sensor element is connected with an input pin 51 of controller 4;
The output pin of controller 4 is divided into two groups, and one group of output pin is connected with the control end of six full-controlled switching elements of current transformer 3, and the control signal of corresponding output is G respectively
1～G
6; Another group output pin is connected with the control end of 4 full-controlled switching elements in in energized circuit 11 or half-bridge 2 or H bridge, and the corresponding control signal of exporting is G
e.
Or the DC voltage U of current transformer 3
dCwith exciting current I
f;
Or the DC voltage U of current transformer 3
dCwith exciting current I
fdC side electric current I with current transformer 3
dC;
Or the DC voltage U of current transformer 3
dCwith exciting current I
fwith the biphase current in motor output three-phase current;
Or the DC voltage U of current transformer 3
dCwith exciting current I
fwith motor three-phase current; Or the DC voltage U of current transformer 3
dCwith exciting current I
fwith two line voltage of motor three-phase or the DC voltage U of current transformer 3
dCwith exciting current I
fthree line voltages with motor.
Further, the efficiency characteristic curve of the instantaneous working point parameter that controller 4 is inputted by pin 51 and storage inside, determines efficient operating point, and the set-point using numerical value corresponding to this efficient operating point as follow-up pi regulator; By the adjusting of the pi regulator in controller 4, and the modulation of signal modulator, controller 4 output control signal G
1～G
6with G
e, control respectively six switch element S in current transformer 3
1-S
6the turn-on and turn-off of 4 full-controlled switching elements in in 31-36 and energized circuit 11 or half-bridge 2 or H bridge.
Further, when efficiency characteristic curve is three-dimensional or curve more than three-dimensional, curve is carried out to dimension-reduction treatment.
Task of the present invention is: a kind of for AC Motor Control method that can electric excitation, its topological structure as shown in Figure 1, comprising: energized circuit 1, motor 2, current transformer 3, controller 4 four parts.Wherein, motor 2 is a kind of alternating current machine that can electric excitation.Energized circuit 1 be input as DC power supply U
e, output connects motor 2 excitation winding 14, and it act as: by control signal G
econtrol to full-controlled switching element in energized circuit 2, regulates the size and Orientation of exciting current, thereby has influence on the close distribution of magnetic and the magnetic circuit saturated conditions of motor 2 inside, and then affects iron loss and the copper loss equal loss of motor.The AC of current transformer 3 is connected with three phase windings of motor 2, and DC side is connected with load/power supply, and current transformer 3 is by six full-controlled switching element 31-36(S
1-S
6) form, its role is to: by control signal G
1-G
6to full-controlled switching element 31-36(S
1-S
6) turn-on and turn-off control, realize the adjusting to the parameter of part/whole instantaneous working points, have influence on motor rectifier loss and copper loss equal loss simultaneously.Controller 4 be input as instantaneous working point parameter, be output as two groups of control signal G
ewith G
1-G
6, its role is to: according to the efficiency characteristics curve of instantaneous working point parameter and controller storage inside, through computational analysis, export two groups of control signal G
ewith G
1-G
6, and be respectively used to control in energized circuit full-controlled switching element 31-36(S in full-controlled switching element and current transformer
1-S
6) turn-on and turn-off, the controlled loss of motor (copper loss, iron loss, rectifier loss etc.) is reduced, and then improves motor working efficiency.
According to the present invention, this task is by solving in the feature described in claim 1.Other expansion scheme of the present invention are all subordinated to claim theme.Main thought of the present invention is: for alternating current machine that can electric excitation, impact according to exciting current on copper loss, iron loss, and the impact of converter control method on copper loss and rectifier loss, obtain relevant efficiency characteristic curve, and utilization ratio characteristic curve and instantaneous working point parameter are as input variable, have designed the collaborative adjuster of a kind of excitation-current transformer, by the control of this adjuster, the controlled loss sum such as copper loss, iron loss of motor is reduced, improve motor operational efficiency.
Wherein, choosing of instantaneous working point parameter is fixed according to some feedback quantities that need to use in the characteristic parameter that efficiency is exerted an influence and control.
Efficiency characteristic curve is the relation curve of characteristic parameter group and efficiency, and wherein, characteristic parameter group is under the jurisdiction of instantaneous working point parameter, is the combination of one or more parameter.Especially, this characteristic parameter group is excitation and the important embodiment of current transformer to effectiveness affects, and is also determining excitation and the impact of current transformer control on efficiency.This efficiency characteristic curve is the data that pre-determine and deposited in controller inside, can directly read in use, without measuring in real time, has reduced the operation time of controller, has improved controller execution efficiency.
Wherein, the parameter of instantaneous working point is chosen as follows: DC bus-bar voltage U
dCor DC bus-bar voltage U
dCwith exciting current I
for DC bus-bar voltage U
dCwith exciting current I
fwith DC bus current I
dCor DC bus-bar voltage U
dCwith exciting current I
fwith two/three-phase or the DC bus-bar voltage U in motor output three-phase current
dCwith exciting current I
fwith motor speed n or rotor position or DC bus-bar voltage U
dCwith exciting current I
fwith motor output three-phase voltage.
The applicable motor type of the present invention is: alternating current machine that can electric excitation.
Compared with prior art, the present invention has the following advantages:
1,, according to instantaneous working point parameter and efficiency characteristic curve mode, the control mode that adopts excitation-current transformer to combine, reduces the total controlled loss of motor (copper loss, iron loss equal loss), and then improves total motor working efficiency.
2, efficiency characteristic curve is the data that pre-determine and deposited in controller inside, can directly read in use, has improved controller execution efficiency.
3, to be applicable to applicable range of motors wide in the present invention.Can be generator, can be also motor, can also be generating/electromotion integrated motor; Can be traditional claw-pole motor, can be also the motor with novel arrangements such as composite excitation; Motor winding connection adopts Y type or Δ type all can.
Accompanying drawing explanation
Fig. 1 is system topology block diagram
Fig. 2 is a kind of concrete case study on implementation of controller
Fig. 3 is the I after dimensionality reduction
f– η two-dimensional curve schematic diagram
Embodiment
The composition frame chart of system hardware shown in Fig. 1, is comprised of energized circuit 1, motor 2, current transformer 3, controller 4.Wherein:
Energized circuit 1 be input as DC power supply U
eoutput is connected with motor 2 by excitation winding 14, the connected mode of its input and output: can directly be connected or the half-bridge of two full-controlled switching elements compositions or the H bridging of four full-controlled switching element compositions connect by a full-controlled switching element.It act as: by control signal G
econtrol to full-controlled switching element in energized circuit 2, regulates exciting current I
fsize and Orientation, thereby have influence on the close distribution of magnetic and the magnetic circuit saturated conditions of motor 2 inside, and then affect iron loss and the copper loss equal loss of motor.
The instantaneous working point parameter of above-mentioned pin 51 inputs is the various desired parameters information that measure in real time by all kinds of sensing elements, and its hardware connection mode is: the DC voltage U that comprises current transformer 3 when the input of controller 4
dCtime, voltage sensor element of DC side parallel of current transformer 3, the output of voltage sensor element connects an input pin 51 of controller 4; The DC side electric current I that comprises current transformer 3 when the input of controller 4
dCtime, the DC side of current transformer 3 is installed a current sensing, and the output of current sensing connects an input pin 51 of controller 4; When three-phase current that the input of controller 4 comprises motor 2, three phase windings of motor 2 are installed current sensing, and the output of current sensing connects three input pins 51 of controller 4; When the input of controller 4 comprises the exciting current I in energized circuit 1
ftime, current sensing is arranged in energized circuit 1, and the output of current sensing connects an input pin 51 of controller 4; When the input of controller 4 comprises motor 2 rotor-positions or rotating speed, position sensing element is installed in motor 2, and the output of position transducer connects an input pin 51 of controller 4; During the phase voltage of three phase windings that comprise motor 2 when the input of controller 4, three phase windings of motor 2 and three voltage sensor elements join, wherein, each phase winding is connected with an input of a voltage sensor element, the neutral point of three phase windings is connected with another reference input of voltage sensor element, and the output of each voltage sensor element is connected with an input pin 51 of controller 4; During the line voltage of three phase windings that comprise motor 2 when the input of controller 4, three phase windings of motor 2 and three voltage sensor elements join, wherein, two-phase in three phase windings is connected with two inputs of voltage sensor element, and the output of each voltage sensor element is connected with an input pin 51 of controller 4.
At this, the instantaneous working point parameter of pin 51 inputs is used: the DC voltage U of current transformer 3
dCor the DC voltage U of current transformer 3
dCwith exciting current I
for the DC voltage U of current transformer 3
dCwith exciting current I
fdC side electric current I with current transformer 3
dCor the DC voltage U of current transformer 3
dCwith exciting current I
fdC voltage U with motor speed n or rotor position or current transformer 3
dCwith exciting current I
fdC voltage U with motor three-phase phase voltage or current transformer 3
dCwith exciting current I
fwith two phase voltages in motor three-phase phase voltage or the DC voltage U of current transformer 3
dCwith exciting current I
fwith three line voltage of motor or the DC voltage U of current transformer 3
dCwith exciting current I
fwith two line voltage of motor or the DC voltage U of current transformer 3
dCwith exciting current I
fwith the three-phase current of motor or the DC voltage U of current transformer 3
dCwith exciting current I
fwith the biphase current in the three-phase current of motor.
The effect of controller 4 is: according to the efficiency characteristic curve 53 of instantaneous working point parameter and controller 4 storage inside, through computational analysis, export two groups of control signal G
ewith G
1-G
6, and be respectively used to control full-controlled switching element in energized circuit 1 and the full-controlled switching element 31-36(S in current transformer 3
1-S
6) turn-on and turn-off, the controlled loss (copper loss, iron loss, rectifier loss etc.) of motor 2 is reduced, and then improves motor working efficiency.
Before narrated the outside annexation of controller 4 and energized circuit 1, motor 2, current transformer 3 and the instantaneous working point parameter of input pin 51 correspondences and control signal G corresponding to output pin
ewith G
1-G
6, narrate the software part of controller 4 inside below.Its core component is the collaborative adjuster 52 of excitation-current transformer, and the collaborative adjuster of this excitation-current transformer has two groups of input signals, is respectively the instantaneous running parameter of pin 51 inputs and the efficiency characteristic curve 53 of controller 4 storage inside; Two groups of output control signals are 21～26(G
1～G
6) and 27(G
e).Wherein, instantaneous working point parameter, two groups of output control signal 21～26(G
1～G
6) and 27(G
e) with noted earlier identical, repeat no more here, below efficiency characteristic curve 53 is described in detail.
In controller 4, the effect of the collaborative adjuster 52 of excitation-current transformer is: by inputting instantaneous working point parameter and efficiency characteristic curve 53, through computing and control, then export control signal G
1～G
6and G
e, control respectively conducting and the shutoff of each switch element in current transformer 2 and energized circuit 1, have influence on the contrary instantaneous working point parameter, and finally realize the control effect of the efficient operation of motor.Wherein, committed step is computing and control, below this step is elaborated.
This step is: the first step, proposes the instantaneous working point of a part that relates to characteristic parameter in efficiency characteristic curve 53 parameter; Second step, this part the instantaneous working point parameter proposing according to the first step, determine that current system operating mode (mentions above, instantaneous working point parameter is the real-time parameter information of system, therefore, instantaneous working point parameter has reflected current system operating mode) region of correspondence in the middle of efficiency characteristic curve 53, the efficiency operation point in selected this region, and the set-point using the corresponding parameter value of this efficient operating point as follow-up pi regulator; The 3rd step, by conventional pi regulator, output controlled quentity controlled variable, recycles conventional modulator and controlled quentity controlled variable is converted into the control signal G of switch element
1～G
6and G
e.
Full-controlled switching element 31～the 36(S of current transformer 3 in Fig. 1
1～S
6) preferentially select n channel mosfet element with the full-controlled switching element of energized circuit 2.The hardware carrier of controller 4 is selected microprocessor, comprising: the one or more combination in single-chip microcomputer, DSP, FPGA, ARM, PLC.And controller 4 is the control signal G of output
1～G
6and G
erelated computing completes by software programming on microprocessor.In energized circuit 2, input and the connected mode of exporting, preferentially select H bridge, because it can control size and the direction of exciting current.
Fig. 2 shows a kind of controller example, is applicable to a kind of control of alternator for vehicle, and this application case feature is: generator shaft speed n is subject to engine control, and the DC voltage U of current transformer
dCneed to be stabilized in particular value 14.5V ± 0.25V, and I
dCbe subject to the joint effect of current transformer and load characteristic.
First, each part and function thereof are discussed in detail.
In Fig. 2, selected efficiency characteristic curve 53 is I
f, I
dC, n-η curve, the characteristic parameter that wherein determines efficiency eta is I
f, I
dCwith n.This curve by experiment method obtains, example: control characteristic parameter n(1800rpm～12000rpm wherein) and I
dC(20A～130A) is definite value, makes I
fwithin the scope of-7A～7A, change, and measure efficiency value η corresponding in different exciting current value situation; Change subsequently n and I
dCvalue, repeat as above step and measure efficiency value η.Form by the result measuring by matrix is stored in controller, and without measuring in real time, this has reduced the operation time of controller, has improved controller execution efficiency.
In Fig. 2, selected instantaneous working point parameter is U
dC, I
f, I
dCwith n.U wherein
dC, I
f, I
dCas two closed loop controllers 55 and 57 required feedback signals; Meanwhile, I
dCwith n joint efficiency characteristic curve 53 for obtaining the corresponding parameter value of efficient operating point, the subsequently set-point using this parameter value as pi regulator.
The collaborative adjuster 52 of excitation-current transformer shown in Fig. 2 is mainly by efficient operation point selection control point adjustment 54, U
dC-I
dCtwo closed loop PI controllers 55, current transformer signal modulator 56, I
fclosed loop PI controller 57, excitation signal modulator 58 form.
Wherein, efficient operation point selection control point adjustment 54 act as: according to the characteristic parameter I in the parameter of instantaneous working point
dCwith n, read I
f, I
dC, n-η curve, and through 54 analytical calculations of efficient operation point selection control point adjustment, choose the exciting current I that under this condition, motor efficient operating point is corresponding
f, and as I
fthe given input of closed loop PI controller 57; In addition U,
dC-I
dCthe given input U of two closed loop PI controllers 55
dC *(corresponding with 14.5V) also provided by this efficient operation point selection control point adjustment 54.This efficient operation point selection control point adjustment 54 is the major embodiments to " excitation-current transformer is collaborative to be regulated " in the collaborative adjuster 52 of excitation-current transformer.
U
dC-I
dCtwo closed loop PI controllers 55 act as: to U
dCwith I
dCcarry out two closed-loop controls, object is to make U
dCbe stable within the scope of 14.5V ± 0.25V, and regulate I
dCit is met load supplying requirement.In addition, to I
dCcontrol also will have influence on waveform, phase place and the amplitude of phase current, and then affect the copper loss size of motor, and electric efficiency exerted an influence.But, the output of this pi regulator is only a kind of controlled quentity controlled variable, also needs current transformer signal modulator 56, just this controlled quentity controlled variable can be converted into control signal G here
1～G
6, this control signal and then to six full-controlled switching element 31～36(S in current transformer
1～S
6) turn-on and turn-off control and could realize the above-mentioned impact that electric efficiency is produced.
I
fthe effect of closed loop PI controller 57 is: the I that regulates exciting current
fsize and Orientation, thus have influence on the close distribution of magnetic of motor internal, and then have influence on copper loss and the iron loss of motor, and electric efficiency is exerted an influence.With epimere narration, the output of this pi regulator is only a kind of controlled quentity controlled variable, also needs current transformer signal modulator 58, just this controlled quentity controlled variable can be converted into control signal G
e, this control signal and then the turn-on and turn-off of full-controlled switching element in energized circuit are controlled and could be realized the above-mentioned impact that electric efficiency is produced.
Above, each part and the effect of a kind of controller example shown in Fig. 2 are had been described in detail.Below for core in controller, about the calculation and analysis method of efficiency characteristic curve 53 and instantaneous working point parameter elaborates, this part is calculated and mainly by efficient operation point selection control point adjustment, is completed.
In Fig. 2, efficient operation point selection control point adjustment 54 need to be done two work: (1) is to efficiency characteristic curve 53 dimensionality reductions; (2) choose efficient operating point.Wherein, efficiency characteristic curve 53 is I
f, I
dC, n-η curve, relates to I
f, I
dC, n, tetra-parameters of η, are a kind of four-dimensional curves.If directly this four-dimension curve is processed, need a large amount of computings, this will not only propose high request to microprocessor, and can reduce the execution efficiency of controller.Therefore, need to carry out dimension-reduction treatment to this four-dimension curve.In addition, I
f, I
dC, n-η curve by experiment method obtains, and is stored in numeric type microprocessor, so I
f, I
dC, the practical manifestation form of n-η curve is that the matrix form with discrete type is stored in microprocessor, the amount of using in processing procedure is also discrete data.
First, in Fig. 2 example illustrated, because rotation speed n is subject to internal combustion engine, control, but not therefore the control of motor 2, can, according to the n parameter in the instantaneous working point parameter measuring in real time, obtain current rotation speed n at I
f, I
dC, the interval [n of corresponding rotating speed in n-η curve
1, n
2] (curve is discrete, therefore obtains only interval).I
f, I
dC, n-η curve becomes rotating speed at interval [n
1, n
2] interior I
f, I
dC– η three-dimensional curve.Subsequently, due to electric current I
dCdepend primarily on load, therefore, can be according to the I in the instantaneous working point parameter measuring in real time
dCparameter, obtains current rotating speed I
dCat I
f, I
dC, [I between corresponding Current Zone in n-η curve
dC1, I
dC2] (curve is discrete, therefore obtains only interval).Rotating speed is at interval [n
1, n
2] interior I
f, I
dC– η three-dimensional curve becomes rotating speed at interval [n
1, n
2], current transformer DC side electric current is at [I
dC1, I
dC2] interior I
f– η two-dimensional curve.Finally, select efficient operating point output as the set-point of later stage pi regulator.I after dimensionality reduction as shown in Figure 3
f– η two-dimensional curve schematic diagram, efficient operating point is at (η
4, I
f4) near, the implication of this point is: rotating speed is at interval [n
1, n
2], current transformer DC side electric current is at [I
dC1, I
dC2] in, efficient operating point exciting current is I
f4, just choose I here
f4as I
fthe set-point of closed loop PI controller.
Compare with conventional method, the method can improve 2%～7% by motor working efficiency.
Claims (4)
1. an AC Motor Control method that can electric excitation, is characterized in that, application is as lower device, and this device comprises: energized circuit (1), motor (2), current transformer (3), controller (4) four parts;
Energized circuit (1) be input as DC power supply U
e, output is connected with motor (2) by the excitation winding (14) of motor (2); The input of energized circuit (1) and output connected mode are to connect by the half-bridge connection that a full-controlled switching element is directly connected or two full-controlled switching elements form or the H bridging of four full-controlled switching element compositions;
Current transformer (3) is by six full-controlled switching element S
1-S
6(31-36) three-phase bridge forming, the AC of current transformer (3) is connected with three phase windings of motor (2), and DC side is connected with load/power supply;
Controller (4) is a kind of microprocessor;
The DC voltage U that comprises current transformer (3) when the input of controller (4)
dCtime, voltage sensor element of DC side parallel of current transformer (3), the output of voltage sensor element connects an input pin (51) of controller (4);
The DC side electric current I that comprises current transformer (3) when the input of controller (4)
dCtime, the DC side of current transformer (3) is installed a current sensing, and the output of current sensing connects an input pin (51) of controller (4);
When three-phase current that the input of controller (4) comprises motor (2), three phase windings of motor (2) are installed current sensing, and the output of current sensing connects three input pins (51) of controller (4);
When the input of controller (4) comprises the exciting current I in energized circuit (1)
ftime, current sensing is arranged in energized circuit (1), and the output of current sensing connects an input pin (51) of controller (4);
When the input of controller (4) comprises motor (2) rotor-position or rotating speed, position sensing element is installed in motor (2), and the output of position transducer connects an input pin (51) of controller (4);
During the phase voltage of three phase windings that comprise motor (2) when the input of controller (4), three phase windings of motor (2) and three voltage sensor elements join, wherein, each phase winding is connected with an input of a voltage sensor element, the neutral point of three phase windings is connected with another reference input of voltage sensor element, and the output of each voltage sensor element is connected with an input pin (51) of controller (4);
During the line voltage of three phase windings that comprise motor (2) when the input of controller (4), three phase windings of motor (2) and three voltage sensor elements join, wherein, two-phase in three phase windings is connected with two inputs of voltage sensor element, and the output of each voltage sensor element is connected with an input pin (51) of controller (4);
The output pin of controller (4) is divided into two groups, and one group of output pin is connected with the control end of six full-controlled switching elements of current transformer (3), and the control signal of corresponding output is G respectively
1～G
6; Another group output pin is connected with the control end of 4 full-controlled switching elements in in energized circuit (1) 1 or half-bridge 2 or H bridge, and the control signal that correspondence is exported is G
e.
2. a kind of AC Motor Control method that can electric excitation according to claim 1, is characterized in that, controller (4) is inputted instantaneous working point parameter by pin (51), and instantaneous working point parameter comprises: the DC voltage U of current transformer (3)
dC;
Or the DC voltage U of current transformer (3)
dCwith exciting current I
f;
Or the DC voltage U of current transformer (3)
dCwith exciting current I
fand the DC side electric current I of current transformer (3)
dC;
Or the DC voltage U of current transformer (3)
dCwith exciting current I
fwith the biphase current in motor output three-phase current;
Or the DC voltage U of current transformer (3)
dCwith exciting current I
fwith motor three-phase current; Or the DC voltage U of current transformer (3)
dCwith exciting current I
fwith two line voltage of motor three-phase or the DC voltage U of current transformer (3)
dCwith exciting current I
fthree line voltages with motor.
3. a kind of AC Motor Control method that can electric excitation according to claim 1, it is characterized in that, controller (4) is by the instantaneous working point parameter of pin (51) input and the efficiency characteristic curve of storage inside, determine efficient operating point, and the set-point using numerical value corresponding to this efficient operating point as follow-up pi regulator; By the adjusting of the pi regulator in controller (4), and the modulation of signal modulator, controller (4) output control signal G
1～G
6with G
e, control respectively six switch element S in current transformer (3)
1-S
6(31-36) turn-on and turn-off of 4 full-controlled switching elements in and in energized circuit (1) 1 or half-bridge 2 or H bridge.
4. a kind of AC Motor Control method that can electric excitation according to claim 3, is characterized in that, when efficiency characteristic curve is the curve more than three-dimensional or three-dimensional, curve is carried out to dimension-reduction treatment.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1507146A (en) * | 2002-11-29 | 2004-06-23 | ������������ʽ���� | Power generation motor system for vehicle |
| US20110121773A1 (en) * | 2008-07-09 | 2011-05-26 | Josef Schmidt | Separately Excited Electrical Synchronous Machine, and Method for Operating a Synchronous Machine |
| CN102099992A (en) * | 2008-07-17 | 2011-06-15 | 三菱电机株式会社 | Power supply device |
| CN102647139A (en) * | 2011-02-16 | 2012-08-22 | 利莱森玛电机公司 | Synchronous alternator comprising coil wound rotor and assembly operating converter variable regime |
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| CN105991076A (en) * | 2015-02-12 | 2016-10-05 | 上海电气风电设备有限公司 | Ocean current generator excitation torque auxiliary braking system and operating mode |
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| CN103607154B (en) | 2017-02-01 |
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