CN105021990A - Demagnetization detection method and system for permanent magnet motor and frequency converter - Google Patents
Demagnetization detection method and system for permanent magnet motor and frequency converter Download PDFInfo
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Abstract
The invention discloses a demagnetization detection method and system for a permanent magnet motor and a frequency converter. Wherein, the method comprises the following steps: collecting the electrical parameters of the permanent magnet motor and outputting the flux linkage of the permanent magnet motor according to the electrical parameters; acquiring preset flux linkage parameters of the permanent magnet motor; comparing whether the output flux linkage is consistent with a preset flux linkage parameter or not; and determining demagnetization of the permanent magnet motor when the comparison result indicates that the flux linkage is inconsistent with the preset flux linkage parameter. The invention solves the technical problem that the demagnetization detection of the permanent magnet motor in the prior art is inaccurate.
Description
Technical field
The present invention relates to Electrified Transmission field, in particular to a kind of demagnetization detection method of magneto, system and frequency converter.
Background technology
Magneto is widely used owing to having the feature such as high power density, high-level efficiency, but the demagnetization problems affect that the permanent magnet in magneto may occur the safe and stable operation of magneto.Current frequency converter all can have the protections such as excess current, superpotential, under-voltage, but lacks and protect the demagnetization of magneto.
The main cause of permanent magnet demagnetization be high temperature and big current time the armature reaction that causes, short trouble, overlond running and instantaneous overload run, all the big current being greater than rated current several times will be produced, big current will produce very large degaussing mmf in armature, increase the possibility that all demagnetization or local demagnetization occur permanent magnet.In addition, motor, by the restriction of running environment radiating condition, makes permanent magnet operating point temperature raise further, has exceeded the working temperature of permanent magnet, adds the possibility that permanent magnet demagnetization fault occurs.When permanent magnet generating portion is demagnetized, for meeting the demand of load operation, stator current need be increased, form larger demagnetization magnetic potential, and the increase of stator current will make magneto temperature raise further, the further loss of excitation of permanent magnet, forms a vicious cycle, the working point of permanent magnet is moved below the flex point of demagnetizing curve, produces the serious consequence of irreversible demagnetization.
Current countermeasure is by setting the magneto current protection value (maximal value) of frequency converter and permanent magnet motor stator surface temperature maximal value.But magneto demagnetization current is at different ambient temperatures different, and this current protection value needs repeatedly to test to obtain, workload greatly and do not have versatility.And the temperature difference of permanent magnet motor stator surface temperature and rotor permanent magnet is very large, be also difficult to play a protective role.If frequency converter is too low to the setting of stator surface temperature maximum, the serviceability of magneto obviously can be reduced.Therefore, prior art existence detects inaccurate technical matters to the demagnetization of magneto.
For above-mentioned problem, at present effective solution is not yet proposed.
Summary of the invention
Embodiments provide a kind of demagnetization detection method of magneto, system and frequency converter, detect inaccurate technical matters at least to solve the demagnetization of prior art to magneto.
According to an aspect of the embodiment of the present invention, provide a kind of demagnetization detection method of magneto, comprising: gather the electrical quantity of described magneto and export the magnetic linkage of described magneto according to described electrical quantity; Obtain the default magnetic linkage parameter of described magneto; Whether the magnetic linkage relatively exported is consistent with described default magnetic linkage parameter; And when comparative result indicates described magnetic linkage and described default magnetic linkage parameter is inconsistent, determine that described magneto demagnetizes.
Further, described electrical quantity comprises following parameter: the angle of rotor of straight, the quadrature-axis voltage of the stator of described magneto and electric current, described magneto and straight, the quadrature axis inductance of rotating speed, the phase resistance of described magneto and the stator of described magneto.
Further, the magnetic linkage exporting described magneto according to described electrical quantity comprises: adopt magnetic linkage described in following formulae discovery:
Wherein, u
qfor the quadrature-axis voltage component of described magneto, i
qfor the quadrature axis current component of described magneto, i
dfor the direct-axis current component of described magneto, L
qfor the quadrature axis inductive component of described magneto, L
dfor the d-axis inductive component of described magneto, R is phase resistance, ω
mfor the rotating speed of the rotor of described magneto, p
pfor permanent magnet machine rotor number of pole-pairs.
Further, when comparative result indicates described magnetic linkage and described default magnetic linkage parameter is inconsistent, after determining the demagnetization of described magneto, described method comprises: the information sending the demagnetization of described magneto; Or control described magneto to shut down.
According to the another aspect of the embodiment of the present invention, additionally provide a kind of demagnetization detection system of magneto, comprise: electrical quantity acquisition module, the receiving end of described electrical quantity acquisition module is connected with described magneto, for gathering the electrical quantity of described magneto; Flux linkage calculation module, the receiving end of described flux linkage calculation module is connected with the output terminal of described electrical quantity acquisition module, for calculating the magnetic linkage of described magneto according to described electrical quantity; Demagnetization judge module, the receiving end of described demagnetization judge module is connected with the output terminal of described flux linkage calculation module, whether the default magnetic linkage parameter for comparing magnetic linkage and the described magneto calculated is consistent, and when comparative result indicates described magnetic linkage and described default magnetic linkage parameter is inconsistent, determine that described magneto demagnetizes.
Further, described electrical quantity acquisition module comprises: current-voltage sampling module, the receiving end of described current-voltage sampling module is connected with described magneto, and output terminal is connected with described flux linkage calculation module, for gathering cross, straight shaft voltage and the electric current of described magneto; Rotor sampling module, receiving end is all connected with the output terminal of described magneto, described current-voltage sampling module, and output terminal is connected with the receiving end of described flux linkage calculation module, for gathering angle and the rotating speed of the rotor of described magneto; And parameter identification module, receiving end is connected with the output terminal of described current-voltage sampling module, the output terminal of described rotor sampling module, and output terminal is connected with described flux linkage calculation module, for identification phase resistance, d-axis inductance and AC inductance.
Further, described rotor sampling module is code-disc, rotary transformer or Hall element.
Further, described parameter identification module adopts based on the described phase resistance of genic least squares identification magneto, described d-axis inductance and described AC inductance.
According to the another aspect of the embodiment of the present invention, additionally provide a kind of demagnetization detection system of magneto, comprising: magneto; The demagnetization detection system of above-mentioned magneto, input end is connected with described magneto; Driving circuit, output terminal is connected with described magneto, for driving described magneto.
Further, described driving circuit comprises: rectifier, is connected with power supply, for power rectifier is obtained bus direct current; Bus wave filter, is connected with described rectifier, for carrying out filtering to described bus direct current; Inverter, one end is connected with described bus wave filter, and one end is connected with described magneto in addition, carries out inversion for the electric current exported described bus wave filter, exports PWM waveform to described magneto.
In embodiments of the present invention, gather the electrical quantity of magneto and export the magnetic linkage of magneto according to electrical quantity; Obtain the default magnetic linkage parameter of magneto; Whether the magnetic linkage relatively exported is consistent with default magnetic linkage parameter; And when comparative result indicates magnetic linkage and default magnetic linkage parameter is inconsistent, determine that magneto demagnetizes.Due to export magnetic linkage compared with the magnetic linkage of magneto itself, whether magnetic linkage directly can react permanent magnet and demagnetize, instead of cause the reason of demagnetizing to judge whether magneto demagnetizes with monitoring, thus reach the effect improving the accuracy detecting magneto demagnetization, and then the demagnetization of solution prior art to magneto detects inaccurate technical matters.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the demagnetization detection system of magneto according to the embodiment of the present invention;
Fig. 2 is the circuit connection diagram of magneto in the frequency converter according to the embodiment of the present invention;
Fig. 3 is the process flow diagram of the demagnetization detection method of magneto according to the embodiment of the present invention.
Embodiment
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
It should be noted that, term " first ", " second " etc. in instructions of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as embodiments of the invention described herein can with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
According to the embodiment of the present invention, provide a kind of embodiment of demagnetization detection system of magneto.Fig. 1 is the schematic diagram of the demagnetization detection system of magneto according to the embodiment of the present invention.As shown in Figure 1, the demagnetization detection system of this magneto comprises: electrical quantity acquisition module 10, flux linkage calculation module 20 and demagnetization judge module 30.
The receiving end of electrical quantity acquisition module 10 is connected with magneto 40, for gathering the electrical quantity of magneto.In order to calculate the magnetic linkage of the permanent magnet of magneto, electrical quantity acquisition module 10 is utilized to connect magneto, to gather the parameter of magneto.
The receiving end of flux linkage calculation module 20 is connected with the output terminal of electrical quantity acquisition module, for calculating the magnetic linkage of magneto according to electrical quantity.Flux linkage calculation module 20 receives the data of the magneto that electrical quantity acquisition module 10 gathers, and calculates the magnetic linkage of permanent magnet in magneto according to the data gathered.
The receiving end of demagnetization judge module 30 is connected with the output terminal of flux linkage calculation module, whether the default magnetic linkage parameter for comparing magnetic linkage and the magneto calculated is consistent, and when comparative result indicates magnetic linkage and default magnetic linkage parameter is inconsistent, determine that magneto demagnetizes.Demagnetization judge module 30 can obtain the default magnetic linkage data of magneto, and according to default magnetic linkage data judge magnetic linkage that flux linkage calculation module 20 calculates whether with default magnetic linkage data consistent, determine that magneto demagnetizes in the case of inconsistencies.Wherein, presetting magnetic linkage data can be the permanent magnetic material model that magneto is arranged when dispatching from the factory, and can be kept in demagnetization judge module 30, also can preserve and be called by demagnetization judge module 30 in memory.
Calculated the magnetic linkage of magneto by the parameter gathering magneto, and the magnetic linkage parameter of carrying when dispatching from the factory with magneto compares, when comparative result indicates the magnetic linkage of output and default magnetic linkage parameter is inconsistent, determine that magneto demagnetizes.Due to export magnetic linkage compared with the magnetic linkage of magneto itself, whether magnetic linkage directly can react permanent magnet and demagnetize, instead of cause the reason of demagnetizing to judge whether magneto demagnetizes with monitoring, therefore, reach the effect improving the accuracy detecting magneto demagnetization, solve the demagnetization of prior art to magneto and detect inaccurate technical matters.
Alternatively, electrical quantity acquisition module 10 comprises: current-voltage sampling module 101, rotor sampling module 102 and parameter identification module 103.Wherein:
The receiving end of current-voltage sampling module 101 is connected with magneto, and output terminal is connected with flux linkage calculation module, for gathering cross, straight shaft voltage and the electric current of magneto.Cross, straight shaft voltage and the electric current of current-voltage sampling module 101 pairs of magnetoes are sampled, and sampled result is sent to flux linkage calculation module 20.The electric current of collection and voltage can be carried out Clarke transform and park transforms by current-voltage sampling module 101, thus obtain the current component of d-axis, the current component of quadrature axis, can also obtain the component of voltage of d-axis, the component of voltage of quadrature axis.
The receiving end of rotor sampling module 102 is all connected with the output terminal of magneto, current-voltage sampling module, and output terminal is connected with the receiving end of flux linkage calculation module, for gathering angle and the rotating speed of the rotor of magneto.Rotor sampling module 102 can pass through code-disc, rotary transformer or Hall element, measures motor and obtains mechanical angle θ
mand rotational speed omega
m, also can apply position-sensor-free algorithm estimated angle and speed.The angle calculated and speed export to parameter identification module 103 and flux linkage calculation module 20, so that flux linkage calculation module 20 calculates the magnetic linkage of permanent magnet.
The receiving end of parameter identification module 103 is connected with the output terminal of the output terminal of current-voltage sampling module, rotor sampling module, and output terminal is connected with flux linkage calculation module, for identification phase resistance, d-axis inductance and AC inductance.
Parameter identification is that one group of parameter value determined by the model of experimentally data and foundation, the matching test data that the numerical result making to be calculated by model can be last, thus can predict for production run, provides certain theoretical direction.Directly cannot measure due to phase resistance, d-axis inductance and quadrature axis inductance and obtain, the method for parameter identification can be adopted to obtain phase resistance R, d-axis inductance L d and quadrature axis inductance L q.The method of parameter identification has a lot, because the computing power of frequency converter chip is lower, preferably adopts the parameter identification method based on genic least square method.
It should be noted that, above-mentioned electrical quantity acquisition module 10, flux linkage calculation module 20 and demagnetization judge module 30 can adopt microcontroller to carry out software simulating.Current-voltage sampling module 101 can be the peripheral circuit of microcontroller, and rotor sampling module 102 can be the scheme that microcontroller software realizes position-sensor-free.Above-mentioned microcontroller can be the microcontroller of frequency converter.
Be used for the electrical quantity of flux linkage calculation by above-mentioned module acquires, and electrical quantity is sent to flux linkage calculation module, undertaken calculating to obtain magnetic linkage by flux linkage calculation module.Because the electrical quantity calculating magnetic linkage is all the data directly gathered magneto, therefore, the magnetic linkage calculated is more accurate, compare with default magnetic linkage parameter again and just can accurately judge whether magneto demagnetizes, thus solve in prior art inaccurate technical matters is detected to the demagnetization of magneto, reach the technique effect of the demagnetization accurately detecting magneto.
The embodiment of the present invention additionally provides a kind of frequency converter.Usual employing " AC-DC-AC " structure of this frequency converter, namely three-phase (or single-phase) power supply obtains bus direct current by cloth control rectifier, after bulky capacitor filtering, be loaded into three-phase inverting circuit, exports PWM waveform and drives magneto.Whether as shown in Figure 2, magneto 40 is connected with above-mentioned demagnetization detection system, demagnetize for detecting magneto 40 by demagnetization detection system.What be connected with magneto 40 also has inverter 50, the bus wave filter 60 be connected with inverter 50, and the rectifier 70 be connected with bus wave filter 60.Wherein, Power convert is bus direct current by rectifier 70, then carries out filtering to bus direct current, filtered bus direct current is inputed to the electric current that inverter obtains PWM waveform, drives magneto 40 with this electric current.
The demagnetization detection system of magneto is set in frequency converter, Real-Time Monitoring permanent magnet flux linkage state, prevents the deterioration of motor demagnetization situation, the safe and stable operation of protection magneto.For Control System of AC Permanent Magnet Synchronous provides permanent magnet magnetic chain information accurately, guarantee the high-performance high-efficiency operation of frequency converter.
According to the embodiment of the present invention, provide a kind of embodiment of the method for demagnetization detection method of magneto, it should be noted that, can perform in the computer system of such as one group of computer executable instructions in the step shown in the process flow diagram of accompanying drawing, and, although show logical order in flow charts, in some cases, can be different from the step shown or described by order execution herein.
Fig. 3 is the process flow diagram of the demagnetization detection method of magneto according to the embodiment of the present invention, and as shown in Figure 3, the method comprises the steps:
Step S102, gathers the electrical quantity of magneto and exports the magnetic linkage of magneto according to electrical quantity.
Step S104, obtains the default magnetic linkage parameter of magneto.
Step S106, whether the magnetic linkage comparing output is consistent with default magnetic linkage parameter.
Step S108, when comparative result indicates magnetic linkage and default magnetic linkage parameter is inconsistent, determines that magneto demagnetizes.
Presetting magnetic linkage parameter can be the permanent magnetic material model that magneto is arranged when dispatching from the factory, the magnetic linkage of magneto is calculated by the parameter gathering magneto, and the magnetic linkage parameter of carrying when dispatching from the factory with magneto compares, when comparative result indicates the magnetic linkage of output and default magnetic linkage parameter is inconsistent, determine that magneto demagnetizes.Due to export magnetic linkage compared with the magnetic linkage of magneto itself, whether magnetic linkage directly can react permanent magnet and demagnetize, instead of cause the reason of demagnetizing to judge whether magneto demagnetizes with monitoring, therefore, reach the effect improving the accuracy detecting magneto demagnetization, solve the demagnetization of prior art to magneto and detect inaccurate technical matters.
Particularly, electrical quantity comprises following parameter: the angle of rotor of straight, the quadrature-axis voltage of the stator of magneto and electric current, magneto and straight, the quadrature axis inductance of rotating speed, the phase resistance of magneto and the stator of magneto.
In motor operation course, motor stator current i can be measured
aand i
b, then obtain dq axle (d axle is the d-axis in motor, and q axle is the quadrature axis in motor) current component i through Clarke (Clarke) conversion and Parker (Park) conversion
dand i
q.Stator voltage u is obtained by measuring busbar voltage
aand u
b, then obtain dq shaft voltage component u through Clarke conversion and Park conversion
dand u
q.The method of parameter identification is adopted to obtain phase resistance R, d-axis inductance L
dwith with quadrature axis inductance L
q.
Further particularly, comprise according to the magnetic linkage of electrical quantity output magneto: adopt following formulae discovery magnetic linkage:
Wherein, u
qfor the quadrature-axis voltage component of magneto, i
qfor the quadrature axis current component of magneto, i
dfor the direct-axis current component of magneto, L
qfor the quadrature axis inductive component of magneto, L
dfor the d-axis inductive component of magneto, R is phase resistance, ω
mfor the rotating speed of the rotor of magneto, p
pfor permanent magnet machine rotor number of pole-pairs.Permanent magnet machine rotor number of pole-pairs can be obtained by the angle calculation of rotor.
Alternatively, when comparative result indicates magnetic linkage and default magnetic linkage parameter is inconsistent, after determining magneto demagnetization, method comprises: the information sending magneto demagnetization.Or control magneto to shut down.
Judge whether the permanent magnet of magneto demagnetizes by the magnetic linkage and default magnetic linkage parameter that compare output, after judging magneto demagnetization, the information of demagnetization can be sent in time, check whether magneto has the faults such as short trouble, overlond running and instantaneous overload to point out.The information sent can be sound and light alarm, output character prompting etc.Magneto can be avoided to demagnetize further when getting rid of above-mentioned fault.Simultaneously; can also after judging magneto demagnetization; control magneto is shut down; do not stop in time after there is above-mentioned fault to avoid magneto; make magneto produce larger electric current or produce higher temperature, and high temperature and big current may cause the demagnetization of magneto irreversible.Therefore, shut down can prevent permanent magnet demagnetization in time by sending information or controlling magneto, avoid permanent magnet to demagnetize further the irreversible consequence of brought demagnetization, reach the effect of protection permanent magnet.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
In the above embodiment of the present invention, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can see the associated description of other embodiments.
In several embodiments that the application provides, should be understood that, disclosed technology contents, the mode by other realizes.Wherein, device embodiment described above is only schematic, the such as division of described unit, can be that a kind of logic function divides, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of unit or module or communication connection can be electrical or other form.
The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed on multiple unit.Some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form of SFU software functional unit also can be adopted to realize.
If described integrated unit using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a computer read/write memory medium.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words or all or part of of this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprises all or part of step of some instructions in order to make a computer equipment (can be personal computer, server or the network equipment etc.) perform method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, ROM (read-only memory) (ROM, Read-OnlyMemory), random access memory (RAM, Random Access Memory), portable hard drive, magnetic disc or CD etc. various can be program code stored medium.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a demagnetization detection method for magneto, is characterized in that, comprising:
Gather the electrical quantity of described magneto and export the magnetic linkage of described magneto according to described electrical quantity;
Obtain the default magnetic linkage parameter of described magneto;
Whether the magnetic linkage relatively exported is consistent with described default magnetic linkage parameter; And
When comparative result indicates described magnetic linkage and described default magnetic linkage parameter is inconsistent, determine that described magneto demagnetizes.
2. method according to claim 1, is characterized in that, described electrical quantity comprises following parameter:
The angle of rotor of straight, the quadrature-axis voltage of the stator of described magneto and electric current, described magneto and straight, the quadrature axis inductance of rotating speed, the phase resistance of described magneto and the stator of described magneto.
3. method according to claim 1 and 2, is characterized in that, the magnetic linkage exporting described magneto according to described electrical quantity comprises:
Adopt magnetic linkage described in following formulae discovery:
Wherein, u
qfor the quadrature-axis voltage component of described magneto, i
qfor the quadrature axis current component of described magneto, i
dfor the direct-axis current component of described magneto, L
qfor the quadrature axis inductive component of described magneto, L
dfor the d-axis inductive component of described magneto, R is phase resistance, ω
mfor the rotating speed of the rotor of described magneto, p
pfor permanent magnet machine rotor number of pole-pairs.
4. method according to claim 1, is characterized in that, when comparative result indicates described magnetic linkage and described default magnetic linkage parameter is inconsistent, after determining the demagnetization of described magneto, described method comprises:
Send the information of described magneto demagnetization; Or
Control described magneto to shut down.
5. a demagnetization detection system for magneto, is characterized in that, comprising:
Electrical quantity acquisition module, the receiving end of described electrical quantity acquisition module is connected with described magneto, for gathering the electrical quantity of described magneto;
Flux linkage calculation module, the receiving end of described flux linkage calculation module is connected with the output terminal of described electrical quantity acquisition module, for calculating the magnetic linkage of described magneto according to described electrical quantity;
Demagnetization judge module, the receiving end of described demagnetization judge module is connected with the output terminal of described flux linkage calculation module, whether the default magnetic linkage parameter for comparing magnetic linkage and the described magneto calculated is consistent, and when comparative result indicates described magnetic linkage and described default magnetic linkage parameter is inconsistent, determine that described magneto demagnetizes.
6. system according to claim 5, is characterized in that, described electrical quantity acquisition module comprises:
Current-voltage sampling module, the receiving end of described current-voltage sampling module is connected with described magneto, and output terminal is connected with described flux linkage calculation module, for gathering cross, straight shaft voltage and the electric current of described magneto;
Rotor sampling module, receiving end is all connected with the output terminal of described magneto, described current-voltage sampling module, and output terminal is connected with the receiving end of described flux linkage calculation module, for gathering angle and the rotating speed of the rotor of described magneto; And
Parameter identification module, receiving end is connected with the output terminal of described current-voltage sampling module, the output terminal of described rotor sampling module, and output terminal is connected with described flux linkage calculation module, for identification phase resistance, d-axis inductance and AC inductance.
7. system according to claim 6, is characterized in that, described rotor sampling module is code-disc, rotary transformer or Hall element.
8. system according to claim 6, is characterized in that, described parameter identification module adopts based on the described phase resistance of genic least squares identification magneto, described d-axis inductance and described AC inductance.
9. a frequency converter, is characterized in that, comprising:
Magneto;
The demagnetization detection system of the magneto according to any one of claim 5 to 8, input end is connected with described magneto;
Driving circuit, output terminal is connected with described magneto, for driving described magneto.
10. frequency converter according to claim 9, is characterized in that, described driving circuit comprises:
Rectifier, is connected with power supply, for obtaining bus direct current to described power rectifier;
Bus wave filter, is connected with described rectifier, for carrying out filtering to described bus direct current;
Inverter, one end is connected with described bus wave filter, and one end is connected with described magneto in addition, carries out inversion for the electric current exported described bus wave filter, exports PWM waveform to described magneto.
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