CN105811852A - Efficiency improvement device and method of permanent-magnet synchronous motor - Google Patents
Efficiency improvement device and method of permanent-magnet synchronous motor Download PDFInfo
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- CN105811852A CN105811852A CN201610290674.9A CN201610290674A CN105811852A CN 105811852 A CN105811852 A CN 105811852A CN 201610290674 A CN201610290674 A CN 201610290674A CN 105811852 A CN105811852 A CN 105811852A
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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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
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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
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/022—Synchronous motors
- H02P25/03—Synchronous motors with brushless excitation
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- Control Of Ac Motors In General (AREA)
Abstract
The invention discloses an efficiency improvement device and method of a permanent-magnet synchronous motor. The device comprises a rotational speed controller, a microprocessor, a measurement component, a semiconductor switch, an inverter, a motor and a load, wherein the microprocessor is connected with the rotational speed controller, the measurement component, the semiconductor switch and the inverter separately, the semiconductor switch is connected with the measurement component and the inverter separately, the motor is connected with the inverter and the load separately, and the microprocessor is used for calculating a phase angle and a running voltage on the condition of optimal efficiency according to a current signal input by the measurement component and a rotational speed signal input by the rotational speed controller, and outputting the phase angle and the running voltage to the inverter so that the inverter drives the motor to work. With the adoption of the technical scheme of the invention, detail parameters of the motor are not needed, the optimal efficiency of the motor can be achieved, and a control error is prevented due to an environmental factor.
Description
Technical field
The present invention relates to technical field of electronic equipment, particularly relate to efficiency improving device and the method for a kind of permagnetic synchronous motor.
Background technology
Efficient and the simple motor of hardware configuration is following development trend, according to electric efficiency formula E=Pout/PinIt can be seen that under constant load, the unique variable in formula is input power Pin, and input power depends on input voltage and input current.Generally, input voltage is basicly stable, and therefore input current is unique variable needing and controlling.It addition, the size of motor internal torque depends on the phase angle between magnetic flux and rotor current.If Three-phase electronic stator flux and stator current are parallel vectors, then the moment that motor obtains is 0, if both directions are in suitable angle, then can produce maximum moment.
Prior art obtains suitable phase angle by control program, it is necessary to a closed-loop control system with feedback, to show position of magnetic pole.This closed-loop control system typically requires three sensors of installation in motor and performs, such as encoder, optical delta device or inductance type transducer.It addition, also there is use sensorless strategy mode to realize, it reaches to control purpose mainly through the induction electromotive force measuring motor.
But use sensorless strategy mode to need to know numerous parameters such as the rated voltage of motor, power, rated current, rated frequency, motor number of pole-pairs in advance, and whether can reach minimum judging whether according to electric current when measuring and reach optimum efficiency.This means for out of phase or phase angle, only higher current absolute value can be only achieved same optimum state, but owing to this measurement electric current can be any one in phase current, motor total current, the electric current of resistor or the electric current of semiconductor switch, so causing that certain part efficiency is best, the efficiency of some part reduces.It addition, under sensorless strategy mode, motor detail parameters is likely to be due to the change of environment (temperature or humidity) and changes, thus causing that the mistake of mistake and specified control desired value is estimated in magnetic field.
Summary of the invention
The embodiment of the present invention proposes a kind of efficiency improving device and the method for permagnetic synchronous motor, it is not necessary to motor detail parameters, can realize motor and reach optimum efficiency, it is to avoid because environmental factors causes control mistake.
The embodiment of the present invention provides the efficiency improving device of a kind of permagnetic synchronous motor, including: rotational speed governor, microprocessor, measuring cell, semiconductor switch, inverter, motor and load；
Wherein, described microprocessor is connected with described rotational speed governor, described measuring cell, described semiconductor switch, described inverter respectively；
Described semiconductor switch is connected with described measuring cell, described inverter respectively；
Described motor is connected with described inverter, described load respectively；
Described microprocessor is for the tach signal of the current signal inputted according to described measuring cell and the input of described rotational speed governor, calculate the phase angle in efficiency optimization situation and working voltage, and described phase angle and working voltage is exported to described inverter, work for motor described in described Driven by inverter.
Further, described microprocessor includes:
Field orientation assembly (42), the first sum unit (72), first integrator (74), first sensor (76), motor permutator (78), the second sum unit (80), signaling switch (82), second integral device (84), multiplexer (86), the second sensor (88), decision package (90), differential element (92) and third integral device (94)；
Wherein, the voltage input end (60) of described field orientation assembly (42) is connected with the outfan of described motor permutator (78), and β angle signal input (62) of described field orientation assembly (42) is connected with the outfan of described third integral device (94)；
The input of described first integrator (74) is connected with the outfan of described first sum unit (72), the outfan of described first integrator (74) respectively with the negative input of the first sum unit (72), the input of described first sensor (76), the input of described second sensor (88), third integral device (94) input be connected；
The outfan of described first sensor (76) is connected with the positive input of the first input end of described motor permutator (78), described second sum unit (80) respectively；
The outfan of described second sum unit (80) is connected with the second input of described motor permutator (78)；First negative input of described second sum unit (80) is connected with the outfan of described signaling switch (82)；Second negative input of described second sum unit (80) is connected with the outfan of described second integral device (84)；
The first input end of described signaling switch (82) and 0 signal input part connect；Second input of described signaling switch (82) and 1 signal input part connect；
The input of described second integral device (84) is connected with the outfan of described multiplexer (86)；
The first input end of described multiplexer (86) is connected with the outfan of described decision package (90)；Second input of described multiplexer (86) is connected with the outfan of described second sensor (88)；
The input of described decision package (90) is connected with the outfan of described differential element (92).
Further, described microprocessor is connected with described measuring cell, particularly as follows:
Described measuring cell is connected with the input of described field orientation assembly (42), described differential element (92) respectively.
Further, described microprocessor is connected with described rotational speed governor, particularly as follows:
Described rotational speed governor is connected with the positive input of described first sum unit (72).
Further, described microprocessor is connected with semiconductor switch, particularly as follows:
Described semiconductor switch is connected with described field orientation assembly (42).
Correspondingly, the embodiment of the present invention also provides for a kind of improved efficiency method of permagnetic synchronous motor, utilizes the efficiency improving device of the permagnetic synchronous motor described in any one of claim 1 to 5 to realize, and the method comprises the following steps:
Step A: described microprocessor is by the stable operation under the first voltage and described load of motor described in described Driven by inverter, and is sampled described measuring cell gathering, it is thus achieved that the first current amplitude；Described first voltage is default voltage；
Step B: described microprocessor is by the stable operation under the second voltage and described load of motor described in described Driven by inverter, and is sampled described measuring cell gathering, it is thus achieved that the second current amplitude；Wherein, described second voltage is less than described first voltage, and the difference of described first voltage and described second voltage is first threshold；
Step C: whether the second current amplitude described in described microprocessor judges is less than described first current amplitude；If it is, perform step D, otherwise, reducing described second voltage, the difference before making the magnitude of voltage after reduction and reducing is described first threshold, returns step B；
Step D: described microprocessor keeps the stable operation under described second voltage of described motor, and using described second voltage and described second current amplitude as best efficiency point parameter.
Further, the improved efficiency method of described permagnetic synchronous motor also includes:
Step E: judge whether the value of described load changes；If so, step A to D is then repeated, so that it is determined that new best efficiency point parameter；Otherwise, step E is repeated.
Implement the embodiment of the present invention, have the advantages that
The efficiency improving device of the permagnetic synchronous motor that the embodiment of the present invention provides and method, microprocessor is run under steady load and predeterminated voltage by inverter control motor, current of electric is sampled and record simultaneously, then voltage is gradually reduced, if current of electric does not reduce along with the reduction of voltage, then allow motor be maintained under this electric current and voltage and run.If it has, then reduce voltage repeated measure, sampling and contrast, until electric current no longer reduces, allow motor be maintained under this electric current and voltage and run, and record this electric current and voltage as best efficiency point parameter.Needing some special parameter of motor to can be only achieved control purpose compared to the sensorless strategy mode of prior art, technical solution of the present invention, without motor detail parameters, can sense voluntarily and obtain best efficiency point parameter, it is to avoid because environmental factors causes control mistake.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of embodiment of the efficiency improving device of permagnetic synchronous motor provided by the invention；
Fig. 2 is the attachment structure schematic diagram of the another kind of embodiment of the efficiency improving device of permagnetic synchronous motor provided by the invention；
Fig. 3 is the principle assumption diagram of a kind of embodiment of permagnetic synchronous motor provided by the invention；
Fig. 4 is the schematic flow sheet of a kind of embodiment of the improved efficiency method of permagnetic synchronous motor provided by the invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
Referring to Fig. 1, it it is the structural representation of a kind of embodiment of the efficiency improving device of permagnetic synchronous motor provided by the invention.As it is shown in figure 1, the efficiency improving device of this permagnetic synchronous motor, including: rotational speed governor 70, microprocessor 95, measuring cell 56, semiconductor switch 52, inverter 43, motor 40 and load 48.
Wherein, microprocessor 95 is connected with rotational speed governor 70, measuring cell 56, semiconductor switch 52, inverter 43 respectively.Semiconductor switch 52 is connected with measuring cell 56, inverter 43 respectively.Motor 40 is connected with inverter 43, load 48 respectively.
In the present embodiment, microprocessor 95 is for the tach signal of the current signal according to measuring cell 56 input and rotational speed governor 70 input, calculate the phase angle in efficiency optimization situation and working voltage, and phase angle and working voltage is exported to inverter 43, work for inverter 43 drive motor 40.
In the present embodiment, referring to Fig. 2, Fig. 2 it is the attachment structure schematic diagram of another kind of embodiment of efficiency improving device of permagnetic synchronous motor provided by the invention.As in figure 2 it is shown, this permagnetic synchronous motor is three-phase permanent magnet synchronous motor, the winding of three phase electric machine 40 is star winding 44, and motor is symbolistic describes permanent magnet machine rotor 46, and this rotor is the two poles of the earth rotor, it is possible to extend to 4,6,8,10 poles etc..When passing to sinusoidal current, PM rotor produces constant moment.Motor 40 drives load 48, and load 48 is blower fan, the similar substantially constant load of blower fan water pump.The electric current of DC circuit is measured and sampling by measuring cell 56, and measuring cell 56 is made up of measurement resistor or current transformer.Alternating current power supply 54 is powered for whole device.
As in figure 2 it is shown, microprocessor 95 includes: field orientation assembly the 42, first sum unit 72, first integrator 74, first sensor 76, motor permutator the 78, second sum unit 80, signaling switch 82, second integral device 84, multiplexer the 86, second sensor 88, decision package 90, differential element 92 and third integral device 94.
Wherein, the voltage input end 60 of field orientation assembly 42 is connected with the outfan of motor permutator 78, and the β angle signal input 62 of field orientation assembly 42 is connected with the outfan of third integral device 94.The voltage input end 60 of field orientation assembly 42 accepts a magnitude of voltageβ angle signal input 62 receives β angle signal, and β angle determines the rotating speed of motor 40.Because motor 40 is synchronous motor, rotor-position induction apparatus originally can be removed, but owing to whether needs continuous print monitors rotor 46 still in operating, if blocking turn owing to moment is too big, motor 40 is internal still needs to installation site sensor.
In the present embodiment, the outfan of the input of first integrator 74 and the first sum unit 72 connects, the outfan of first integrator 74 respectively with the negative input of the first sum unit 72, the input of first sensor 76, the input of the second sensor 88, third integral device 94 input be connected.
In the present embodiment, microprocessor 95 is connected with rotational speed governor 70, particularly as follows: rotational speed governor 70 is connected with the positive input of the first sum unit 72.The frequency of the rotating excitation field that rotational speed governor 70 produces for specifying field orientation assembly 42 and inverter 43, to microcontroller 95 input speed signal.Rotational speed governor 70 outputs signal to the positive input of the first sum unit 72, and the first sum unit 72 produces an acceleration time, controls the time that rotating speed is from 0 to n.First sum unit 72 outputs signals to first integrator 74.First integrator 74 produces a slope, and its output signal inputs as the negative sense of the first sum unit 72.
In the present embodiment, the outfan of first sensor 76 is connected with the positive input of the first input end of motor permutator 78, the second sum unit 80 respectively.The outfan of the second sum unit 80 is connected with the second input of motor permutator 78.First negative input of the second sum unit 80 is connected with the outfan of signaling switch 82；Second negative input of the second sum unit 80 is connected with the outfan of second integral device 84.
Motor permutator 78 has first input end and two gears of the second input.When electric motor starting accelerates or when motor speed changes, switch is switched to first input end.When motor enters the search pattern of efficiency optimization, switch is switched to the second input.Motor speed signal n is provided by first integrator 74, and output is to first sensor 76, and first sensor 76 produces the parameter P of and velocity correlation.Parameter P obtains according to rotating speed n real-time change, determines the size of output voltage, and formula is:Voltage increases along with the rising of rotating speed, under adjustment modes, and voltage swingInputted to field orientation assembly 42 by motor permutator 78 (gear 1), then export to inverter 43, thus operating in best efficiency point.And when the pattern of search starts, motor permutator 78 is switched to gear 2, and now voltage input end 60 connects the second sum unit 80, and the second sum unit 80 calculates voltageSize after, output to voltage input end 60.
In the present embodiment, the first input end of signaling switch 82 and 0 signal input part connect, and the second input of signaling switch 82 and 1 signal input part connect.
In the present embodiment, the input that forward input is first sensor of the second sum unit 80, i.e. signal n*P.When motor permutator 78 is switched to first input end, the signal 0 of signaling switch 82 inputs as negative sense.When motor permutator 78 is switched to the second input, the signal 1 of signaling switch 82 inputs as negative sense.
In the present embodiment, the input of second integral device 84 is connected with the outfan of multiplexer 86.The output signal of second integral device 84 inputs as another negative sense of the second sum unit 80, can control voltage and constantly decline.
In the present embodiment, the first input end of multiplexer 86 is connected with the outfan of decision package 90.Second input of multiplexer 86 and the outfan of the second sensor 88 connect.The input of decision package 90 is connected with the outfan of differential element 92.The output signal of multiplexer 86 is as the input of integrator 84, and this signal is used for producing voltageThe gradient reduced.In order to control voltageReduction degree, the second sensor 88 produces rotating speed correlative factor P, and as the input of multiplexer 86, rotating speed n is the input of the second sensor 88.First sensor 76 and the second produced parameter P of sensor 88 are same parameter.The output signal of decision element 90 as the input signal of multiplexer 86, according to its standard be more than or equal to or less than or equal to carrying out decision-making.The output signal of differential element 92 is as the input signal of decision element 90.
In the present embodiment, microprocessor 65 is connected with measuring cell 56, particularly as follows: measuring cell 56 is connected with the input of field orientation assembly 42, differential element 92 respectively.Differential element 92 sets up the difference of double electric current.In other words, in search process, electric current I difference size is continually changing, until reaching minima.
In the present embodiment, rotating speed n is integrated by third integral device 94, and output angle signal beta is to field orientation assembly 42.
In the present embodiment, microprocessor 95 is connected with semiconductor switch 52, particularly as follows: semiconductor switch 52 is connected with field orientation assembly 42.
In the present embodiment, microprocessor 95 can be, but not limited to be eight bit microprocessors.
In the present embodiment, three PWM generator it are provided with in inverter 43, to produce three-phase current.Three sinusoidal wave sensors produce three phase sine voltage.In detail as it is shown on figure 3, when motor 40 starts, inverter 43 produces an electric rotating and has a meeting, an audience, etc. well under one's control, thus producing an enough moment.When motor 40 runs, the voltage of the rotating field that inverter 43 produces progressively weakens, thus reducing electric current, when electric current reaches minima, efficiency reaches the best.In Fig. 3, the motor 40 of display has Three-phase electronic 202,204 and 206, and motor 40 has p-m rotor 46, for quadrupole motor.Threephase stator 202,204 and 206 produces three phase sine electric current, μ C95 produce a sinusoidal signal, by name: sint, sin (t+120 °), sin (t+240 °).The frequency-adjustable joint of three-phase signal.Because frequency determines rotating speed, thus need not measure rotating speed.In comparator 272,274,276, signal sint, sin (t+120 °), sin (t+240 °) compares with triangle signal u270 respectively.The output of triangle signal generator 268, as the reverse input of comparator 272,274,276.Three phase sine electric current i204,202 and 206 together form three-phase system, produce a rotating excitation field and drive p-m rotor 46, run with speed.Owing to the magnetization of rotor 46 is sinusoidal, produce the moment of constant.Especially, it is not necessary to complicated and expensive turn-sensitive device, motor 40 operates in optimum efficiency.
In order to better illustrate operation principle and the process step of the present invention, it is the schematic flow sheet of a kind of embodiment of the improved efficiency method of permagnetic synchronous motor provided by the invention referring to Fig. 4, Fig. 4.The efficiency improving device that the method is the permagnetic synchronous motor utilizing the present invention realizes, and the method comprises the following steps:
Step A: microprocessor passes through inverter AC motor stable operation under the first voltage and load, and is sampled measuring cell gathering, it is thus achieved that the first current amplitude；Wherein, the first voltage is default voltage.
Step B: microprocessor passes through inverter AC motor stable operation under the second voltage and load, and is sampled measuring cell gathering, it is thus achieved that the second current amplitude；Wherein, the second voltage is less than the first voltage, and the difference of the first voltage and the second voltage is first threshold.
Step C: whether microprocessor judges the second current amplitude is less than the first current amplitude；If it is, perform step D, otherwise, reducing the second voltage, the difference before making the magnitude of voltage after reduction and reducing is first threshold, returns step B.
Step D: microprocessor keeps motor stable operation under the second voltage, and using the second voltage and the second current amplitude as best efficiency point parameter.
In the present embodiment, the first voltage, the second voltage, the first current amplitude and the second current amplitude are all stored in memorizer.
As a kind of citing of the present embodiment, the method also includes step E: judge whether the value of load changes；If so, step A to D is then repeated, so that it is determined that new best efficiency point parameter；Otherwise, step E is repeated.
Visible, the efficiency improving device of the permagnetic synchronous motor that the embodiment of the present invention provides and method, microprocessor 95 controls motor 40 by inverter 43 and runs under steady load and predeterminated voltage, by measuring cell 56, motor 40 electric current is sampled and record simultaneously, then voltage is gradually reduced, if motor 40 electric current does not reduce along with the reduction of voltage, then allow motor 40 be maintained under this electric current and voltage and run.If it has, then reduce voltage repeated measure, sampling and contrast, until electric current no longer reduces, allow motor 40 be maintained under this electric current and voltage and run, and record this electric current and voltage as best efficiency point parameter.Needing some special parameter of motor to can be only achieved control purpose compared to the sensorless strategy mode of prior art, technical solution of the present invention, without motor detail parameters, can sense voluntarily and obtain best efficiency point parameter, it is to avoid because environmental factors causes control mistake.
One of ordinary skill in the art will appreciate that all or part of flow process realizing in above-described embodiment method, can be by the hardware that computer program carrys out instruction relevant to complete, described program can be stored in a computer read/write memory medium, this program is upon execution, it may include such as the flow process of the embodiment of above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-OnlyMemory, ROM) or random store-memory body (RandomAccessMemory, RAM) etc..
The above is 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 making some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (7)
1. the efficiency improving device of a permagnetic synchronous motor, it is characterised in that including: rotational speed governor, microprocessor, measuring cell, semiconductor switch, inverter, motor and load；
Wherein, described microprocessor is connected with described rotational speed governor, described measuring cell, described semiconductor switch, described inverter respectively；
Described semiconductor switch is connected with described measuring cell, described inverter respectively；
Described motor is connected with described inverter, described load respectively；
Described microprocessor is for the tach signal of the current signal inputted according to described measuring cell and the input of described rotational speed governor, calculate the phase angle in efficiency optimization situation and working voltage, and described phase angle and working voltage is exported to described inverter, work for motor described in described Driven by inverter.
2. the efficiency improving device of permagnetic synchronous motor according to claim 1, it is characterised in that described microprocessor includes:
Field orientation assembly (42), the first sum unit (72), first integrator (74), first sensor (76), motor permutator (78), the second sum unit (80), signaling switch (82), second integral device (84), multiplexer (86), the second sensor (88), decision package (90), differential element (92) and third integral device (94)；
Wherein, the voltage input end (60) of described field orientation assembly (42) is connected with the outfan of described motor permutator (78), and β angle signal input (62) of described field orientation assembly (42) is connected with the outfan of described third integral device (94)；
The input of described first integrator (74) is connected with the outfan of described first sum unit (72), the outfan of described first integrator (74) respectively with the negative input of the first sum unit (72), the input of described first sensor (76), the input of described second sensor (88), third integral device (94) input be connected；
The outfan of described first sensor (76) is connected with the positive input of the first input end of described motor permutator (78), described second sum unit (80) respectively；
The outfan of described second sum unit (80) is connected with the second input of described motor permutator (78)；First negative input of described second sum unit (80) is connected with the outfan of described signaling switch (82)；Second negative input of described second sum unit (80) is connected with the outfan of described second integral device (84)；
The first input end of described signaling switch (82) and 0 signal input part connect；Second input of described signaling switch (82) and 1 signal input part connect；
The input of described second integral device (84) is connected with the outfan of described multiplexer (86)；
The first input end of described multiplexer (86) is connected with the outfan of described decision package (90)；Second input of described multiplexer (86) is connected with the outfan of described second sensor (88)；
The input of described decision package (90) is connected with the outfan of described differential element (92).
3. the efficiency improving device of permagnetic synchronous motor according to claim 2, it is characterised in that described microprocessor is connected with described measuring cell, particularly as follows:
Described measuring cell is connected with the input of described field orientation assembly (42), described differential element (92) respectively.
4. the efficiency improving device of permagnetic synchronous motor according to claim 2, it is characterised in that described microprocessor is connected with described rotational speed governor, particularly as follows:
Described rotational speed governor is connected with the positive input of described first sum unit (72).
5. the efficiency improving device of permagnetic synchronous motor according to claim 2, it is characterised in that described microprocessor is connected with semiconductor switch, particularly as follows:
Described semiconductor switch is connected with described field orientation assembly (42).
6. the improved efficiency method of a permagnetic synchronous motor, it is characterised in that utilizing the efficiency improving device of the permagnetic synchronous motor described in any one of claim 1 to 5 to realize, the method comprises the following steps:
Step A: described microprocessor is by the stable operation under the first voltage and described load of motor described in described Driven by inverter, and is sampled described measuring cell gathering, it is thus achieved that the first current amplitude；Described first voltage is default voltage；
Step B: described microprocessor is by the stable operation under the second voltage and described load of motor described in described Driven by inverter, and is sampled described measuring cell gathering, it is thus achieved that the second current amplitude；Wherein, described second voltage is less than described first voltage, and the difference of described first voltage and described second voltage is first threshold；
Step C: whether the second current amplitude described in described microprocessor judges is less than described first current amplitude；If it is, perform step D, otherwise, reducing described second voltage, the difference before making the magnitude of voltage after reduction and reducing is described first threshold, returns step B；
Step D: described microprocessor keeps the stable operation under described second voltage of described motor, and using described second voltage and described second current amplitude as best efficiency point parameter.
7. the improved efficiency method of permagnetic synchronous motor according to right 6, it is characterised in that also include:
Step E: judge whether the value of described load changes；If so, step A to D is then repeated, so that it is determined that new best efficiency point parameter；Otherwise, step E is repeated.
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