CN106911276A - A kind of three phase electric machine drive circuit - Google Patents
A kind of three phase electric machine drive circuit Download PDFInfo
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- CN106911276A CN106911276A CN201710139911.6A CN201710139911A CN106911276A CN 106911276 A CN106911276 A CN 106911276A CN 201710139911 A CN201710139911 A CN 201710139911A CN 106911276 A CN106911276 A CN 106911276A
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- stator coil
- drive circuit
- electric machine
- unit
- bridge inverter
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The present invention relates to a kind of three phase electric machine drive circuit, including stator coil unit and its drive module, it is characterised in that the drive module includes stator coil control module, half-bridge inverter unit and the current detecting unit for detecting stator coil cell current；The half-bridge inverter unit is made up of three half-bridge inverters, the current detecting unit is made up of three current detecting subelements, the stator coil unit is made up of the stator coil of three mutual electricity cut-offs driven by respective half-bridge inverter, and the half-bridge inverter, current detecting subelement are corresponded with the stator coil.This three phase electric machine drive circuit, starts and speed governing is without additional circuit and low cost.
Description
Technical field
The present invention relates to three phase electric machine, and in particular to a kind of three phase electric machine drive circuit.
Background technology
A kind of Chinese utility model " multi-phase AC motor structure and its drive circuit ", the patent No. 201620230492.8,
Disclose the stator line that stator coil unit is not electrically connected by more than two groups of the mutual cut-off driven by respective full-bridge inverter
The structure of composition, this multi-phase AC motor structure and its drive circuit are enclosed, is started and speed governing is without additional circuit, and noise
It is low, small power consumption.But it is [- 1,1] because sinusoidal wave number is interval, so needing the drive signal of both forward and reverse directions to stator line
Enclose, therefore it can only be driven by full-bridge inverter, this considerably increases the cost of alternating current generator.
On the other hand, its phase coil winding of traditional three-phase DC motor typically use wye connection, three phase coils around
Group has public point, and so every group coil be not independent, mutually pins down, during using half-bridge inverter driving coil, driving current
Signal one group of coil of inflow, any group of outflow from another two groups of coils, in this case, inverter output can only be similar
Sinusoidal voltage or electric current, and the DC Brushless Motor that this voltage or electric current are used for driving can cause many power consumption and audible
Noise.
The content of the invention
The content of the invention
The technical problem to be solved in the invention is how to provide a kind of three phase electric machine drive circuit, start-up circuit structure
Simply, speed governing convenience and low cost.
Above-mentioned technical problem of the invention is so solved, and builds a kind of three phase electric machine drive circuit, including stator coil list
Unit and its drive module, it is characterised in that the drive module includes stator coil control module, half-bridge inverter unit and use
In the current detecting unit of detection stator coil cell current；The half-bridge inverter unit is made up of three half-bridge inverters,
The current detecting unit is made up of three current detecting subelements, and the stator coil unit is by three by respective semi-bridge inversion
The stator coil composition of the mutual electricity cut-off that device drives, the half-bridge inverter, current detecting subelement and the stator coil
Correspond.
According to the drive circuit that the present invention is provided, the stator coil control module is FPGA (Field-
Programmable Gate Array, field programmable gate array) or other there is the chip (IC) of similar functions.
According to the drive circuit that the present invention is provided, the stator coil control module includes being used for according to stator coil electric current
Testing result obtains the backfeed loop unit of the position vector angle theta of current rotating coordinate system and is electrically connected with the backfeed loop
The position vector angle theta of rotating coordinate system is modulated into the digital drive unit of the pwm signal exported by half-bridge inverter.
According to the drive circuit that the present invention is provided, the position vector angle theta of rotating coordinate system refers to stator rotor process gram
Clarke converts the position vector angle with the rotating coordinate system after Park Transformation, and span is 0-360 degree.
According to the drive circuit that the present invention is provided, the three phase electric machine drive circuit also includes controlling mould with the stator coil
The electric machine controller of block electrical connection.
According to the drive circuit that the present invention is provided, the three phase electric machine is alternating current generator or direct current generator.
The three phase electric machine drive circuit that the present invention is provided, breaks through that conventional stator coil is star-like or delta connection, and existing
Technology is compared, and is had the advantage that：
1st, start and speed governing is without additional circuit, noise is low, small power consumption；
2nd, algorithm is simple, realizes that all of winding is all driven with smooth pure sine wave；
3rd, each winding uses half-bridge inverter, greatly reduces product cost.
Brief description of the drawings
Further the present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Fig. 1 is the individual stator coil connected mode schematic diagram in the three phase electric machine structure of the preferred embodiment of the present invention；
Fig. 2 is the electrical block diagram of drive circuit corresponding with three phase electric machine structure shown in Fig. 1；
Fig. 3 is the half-bridge inverter driving circuit structure schematic diagram of any phase in Fig. 1；
Fig. 4 is the corresponding driving principle block diagram of conventional three-phase electric machine structure；
Fig. 5 is field orientation Coordinate Conversion principle schematic；
Fig. 6 is the drive signal schematic diagram after conventional three-phase electric machine structure correspondence field orientation Coordinate Conversion.
Specific embodiment
The three phase electric machine of the preferred embodiment of the present invention, motor stator structure such as Fig. 1, being configured with three groups does not have public point
Independent stator coil, does not interfere with each other, and rotor and common three phase electric machine are as good as.
Stationary part drive system block diagram such as Fig. 2, half-bridge inverter unit drives three-phase electricity using three half-bridge inverters
Machine, half-bridge inverter driving circuit structure figure such as Fig. 3 of a certain phase.
The motor for designing according to this configuration, it is possible to achieve all of stator coil all uses what is smoothed in stator coil unit
To drive, make the stator coil of motor has minimum power harmonic wave to pure sine wave, reaches the drive efficiency of maximum.In addition, the electricity
Machine has used the powerful high speed FPGA of One function to drive three half-bridge inverters simultaneously.FPGA by motor controller controls,
FPGA inside includes digital drive unit and backfeed loop unit, and the input of backfeed loop unit is every group of electric current of stator coil
Signal, can obtain to every group of drive signal of stator coil semi-bridge inversion after being calculated by sine wave algorithm.
A certain phase half-bridge inverter in preferred embodiment, structure as shown in figure 3, by two FETs Q1, Q2,
Raster data model, output motor drive signal is supplied to the corresponding stator coil being connected on terminal J5.In order to reach best switch
Efficiency, all of inverter is all driven with signal, single mode operation.
By stator coil current detection feedback, every group of semi-bridge inversion of coil is then calculated with sine wave algorithm and is driven
The principle of signal：
Sine wave algorithm is the current feedback by the every phase coil in three-phase, analyzes and calculates by some conversion
The three-phase driving signal for more meeting this motor is drawn, dynamical output sine wave is drawn or is arrived three-phase coil close to sine-wave current
Algorithm.Current comparative maturity is FOC algorithms.
As shown in figure 4, FOC is a kind of change of the amplitude and FREQUENCY CONTROL three phase electric machine by controlling frequency converter output voltage
Frequency drive control method, its main thought is exactly the stator current vector by measurement and controlled motor, according to field orientation
Principle is controlled to torque current.Field orientation principle is based primarily upon coordinate transform, and three-phase static coordinate system is converted into two
Mutually rotation coordinate system so that the stator current of coupling be converted to it is mutually orthogonal.Symbolic significance brief description in Fig. 4
It is as follows：Wherein Vd, Vq represent the voltage signal of rotating coordinate system, and id, iq represents the current signal of rotating coordinate system；V α, V β generations
The voltage signal of table rest frame, i α, i β represents the current signal of rest frame；Ia, ib, ic represent three-phase coil respectively
Certain phase current.
Fig. 5 show after the signal transacting of Fig. 4 SVM parts the voltage space for preparing output to three-phase drive bridge inverter
Vector, abbreviation inverter output voltage three dimensional vector diagram.Wherein V1-V6 is 6 effective vectors, and V0, V7 are two failing vectors.
Fig. 6 is then the three-phase PWM signal figure in the region 1 of corresponding diagram 5, wherein：PWMUH、PWMUL、PWMVH、PWMVL、PWMWH、
PWMWL is pwm signal.
This is presently the most advanced driving method, but we can also simply find out that its own is limited very much, and 1) only
Can be suitably used for the three phase electric machine of wye connection；2) because motor wiring is limited, if three-phase coil has small imbalance, motor is opened
The power consumption and noise of dynamic and operating will be very big, because this theory is the stator coil absolute equilibrium based on electronics three phase electric machine；
3) be also finally above all this control mode can not accurately determine motor rotor position, so as to do not reach three phase electric machine turn
Square and smoothing completely for speed control, because the corresponding vector space of the effective vector angle of each two as shown in Figure 5, corresponding
Converter bridge switching parts state is at most only 8 groups (such as Fig. 6).So whole vector space can only at most have 6*8=48 kind inverter bridges
On off state.Namely the full accuracy of FOC can only achieve 360 degree/48=7.5 degree.
The three phase electric machine sine wave drive method of the preferred embodiment of the present invention is modified by FOC algorithm principles, coordinates electricity
The connection of machine is exported to three-phase inverter drive axle reaching completely smooth sine wave signal.Three phase electric machine of the invention is
The line of three-phase 6, each phase is completely independent, so the switch of motor inversion drive axle power tube will not have limitation as shown in Figure 6 (every
Individual vector space may only have 8 groups of on off states), the output voltage of such motor inversion drive axle power tube passes through following algorithm
To determine：The position vector angle theta of rotating coordinate system and current is drawn by the detection and coordinate transform to stator coil electric current
Driving voltage Va, Vb, the Vc applied to every group of coil of three phase electric machine are needed, wherein Va, Vb, Vc are Vm, phase for amplitude is equal
The sinusoidal signal of 120 degree of difference, exists between sine value value【-1,1】This is interval, and the value of (1+sin θ) just exists【0,2】This
Interval, is so modulated to the pwm signal of certain group stator coil using Vm (1+sin θ), and other two groups signals are respectively Vm (1
+ sin (120+ θ)), Vm (1+sin (240+ θ)) can just reach the purpose that three phase electric machine is promoted using half-bridge inverter.It is determined that
The most fast safest switching signal of power tube, is given to the pwm signal that sine wave drive signal is modulated into high frequency each group and determines
Subcoil, can thus realize being driven with smooth sinus the purpose of three phase electric machine, and its precision is only confined to power tube
The working frequency of safety switch time restriction and FPGA, is far more than 7.5 degree of conventional three-phase motor in practicality.By with it is smooth just
String drives three phase electric machine, it is possible to realize the smooth efficient control of the speed and torque under any stage to three phase electric machine.
Sine wave algorithm of the invention is not limited stator coil, if the electricity of completely self-contained 6 line three-phase connection
Machine, then the signal of output to each stator coil will be perfect sine wave signal.
The foregoing is only presently preferred embodiments of the present invention, all impartial changes done according to scope of the invention as claimed with
Modification, should all belong to the covering scope of the claims in the present invention.
Claims (7)
1. a kind of three phase electric machine drive circuit, including stator coil unit and its drive module, it is characterised in that the driving mould
Block includes stator coil control module, half-bridge inverter unit and the current detecting list for detecting stator coil cell current
Unit；The half-bridge inverter unit is made up of three half-bridge inverters, and the current detecting unit is single by three current detecting
Unit's composition, the stator coil unit is made up of the stator coil of three mutual electricity cut-offs driven by respective half-bridge inverter,
The half-bridge inverter, current detecting subelement are corresponded with the stator coil.
2. drive circuit according to claim 1, it is characterised in that the stator coil control module is included for according to fixed
Subcoil current detecting result obtains the backfeed loop unit of the position vector angle theta of current rotating coordinate system and is fed back to this
The numeral that the position vector angle theta of rotating coordinate system is modulated into the pwm signal exported by half-bridge inverter of road electrical connection is driven
Moving cell.
3. drive circuit according to claim 2, it is characterised in that the three phase electric machine drive circuit also includes and the stator
The electric machine controller of coil control module electrical connection.
4. drive circuit according to claim 1, it is characterised in that the current detecting subelement is one end ground connection, another
End is sequentially connected electrically the resistance of stator coil and half-bridge inverter output end.
5. drive circuit according to claim 1, it is characterised in that the current detecting subelement is one end ground connection, another
End is sequentially connected electrically the resistance and the tandem compound of electric capacity of stator coil and half-bridge inverter output end.
6. the drive circuit according to any one of claim 1-5, it is characterised in that the three phase electric machine is alternating current generator.
7. the drive circuit according to any one of claim 1-5, it is characterised in that the three phase electric machine is direct current generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710139911.6A CN106911276A (en) | 2017-03-10 | 2017-03-10 | A kind of three phase electric machine drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710139911.6A CN106911276A (en) | 2017-03-10 | 2017-03-10 | A kind of three phase electric machine drive circuit |
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| CN106911276A true CN106911276A (en) | 2017-06-30 |
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| CN201710139911.6A Pending CN106911276A (en) | 2017-03-10 | 2017-03-10 | A kind of three phase electric machine drive circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233809A (en) * | 2017-12-29 | 2018-06-29 | 江苏集萃智能制造技术研究所有限公司 | A kind of three-phase DC motor design of current ring method based on vector controlled |
| CN108233817A (en) * | 2018-01-15 | 2018-06-29 | 中国人民解放军海军工程大学 | A kind of six phase line inductance electromotor Energy Chain handover control systems and method |
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| CN102655390A (en) * | 2012-05-09 | 2012-09-05 | 浙江大学 | Six-half-bridge voltage type inverter applicable to three-phase asynchronous motor and control method of six-half-bridge voltage type inverter |
| CN202550947U (en) * | 2012-04-16 | 2012-11-21 | 杭州锐方科技有限公司 | Efficient control device for direct-current brushless motor based on phase current cutoff angle |
| JP5233861B2 (en) * | 2009-06-22 | 2013-07-10 | 株式会社デンソー | Motor control device |
| CN104579067A (en) * | 2015-01-09 | 2015-04-29 | 南京航空航天大学 | Excitation fault fault-tolerant power generation system of double-salient electro-magnetic motor and control method of system |
| CN105391353A (en) * | 2015-11-30 | 2016-03-09 | 北京控制工程研究所 | DC motor half-bridge drive circuit |
| CN105871212A (en) * | 2016-06-15 | 2016-08-17 | 晶傲威电气（常州）有限公司 | Power conversion device applied to high-speed flywheel energy storage system |
| CN206533309U (en) * | 2017-03-10 | 2017-09-29 | 刘振韬 | A kind of three phase electric machine drive circuit |
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2017
- 2017-03-10 CN CN201710139911.6A patent/CN106911276A/en active Pending
Patent Citations (7)
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| JP5233861B2 (en) * | 2009-06-22 | 2013-07-10 | 株式会社デンソー | Motor control device |
| CN202550947U (en) * | 2012-04-16 | 2012-11-21 | 杭州锐方科技有限公司 | Efficient control device for direct-current brushless motor based on phase current cutoff angle |
| CN102655390A (en) * | 2012-05-09 | 2012-09-05 | 浙江大学 | Six-half-bridge voltage type inverter applicable to three-phase asynchronous motor and control method of six-half-bridge voltage type inverter |
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| CN105871212A (en) * | 2016-06-15 | 2016-08-17 | 晶傲威电气（常州）有限公司 | Power conversion device applied to high-speed flywheel energy storage system |
| CN206533309U (en) * | 2017-03-10 | 2017-09-29 | 刘振韬 | A kind of three phase electric machine drive circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233809A (en) * | 2017-12-29 | 2018-06-29 | 江苏集萃智能制造技术研究所有限公司 | A kind of three-phase DC motor design of current ring method based on vector controlled |
| CN108233817A (en) * | 2018-01-15 | 2018-06-29 | 中国人民解放军海军工程大学 | A kind of six phase line inductance electromotor Energy Chain handover control systems and method |
| CN108233817B (en) * | 2018-01-15 | 2020-04-17 | 中国人民解放军海军工程大学 | Six-phase linear induction motor energy chain switching control system and method |
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