CN108696224A - The method and apparatus for reducing the loss of electric machine - Google Patents
The method and apparatus for reducing the loss of electric machine Download PDFInfo
- Publication number
- CN108696224A CN108696224A CN201710232961.9A CN201710232961A CN108696224A CN 108696224 A CN108696224 A CN 108696224A CN 201710232961 A CN201710232961 A CN 201710232961A CN 108696224 A CN108696224 A CN 108696224A
- Authority
- CN
- China
- Prior art keywords
- motor
- frequency
- rotating speed
- carrier frequency
- electricity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/28—Controlling the motor by varying the switching frequency of switches connected to a DC supply and the motor phases
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The present invention relates to electric energy control technique fields, and in particular to a method of reducing the loss of electric machine.This method includes:Obtain motor current rotating speed N;Determine the preset rotating speed Qu Jian [ that the current rotating speed is located at;Nn, Nn+1];Obtain left end point N in the rotating speed sectionnCorresponding carrier frequency fnAnd right endpoint N in the rotating speed sectionn+1Corresponding carrier frequency fn+1, wherein when the value of the rotating speed of the motor is NnWhen, Mos pipes are connected in electricity adjusts hardware circuit and the frequency of shutdown is f for the loss of the motornWhen it is minimum, when the value of the rotating speed of the motor is Nn+1When, Mos pipes are connected in electricity adjusts hardware circuit and the frequency of shutdown is f for the loss of the motorn+1When it is minimum;According to fnAnd fn+1, the motor is calculated when current rotating speed N is rotated by carrier frequency calculation formula, the loss of the motor reaches carrier frequency f (N) required when minimum;It is the carrier frequency being calculated that the electricity, which is adjusted the conducting of Mos pipes and the frequency error factor of shutdown in hardware circuit,.The invention further relates to a kind of devices reducing the loss of electric machine.Through the invention, different carrier frequency is set for the different endpoint rotating speeds of motor, to reduce the loss of motor, improves the whole efficiency of dynamical system.
Description
Technical field
The present invention relates to electric energy control technique fields, and in particular to a kind of method and apparatus reducing the loss of electric machine.
Background technology
Unmanned plane is shorter cruise duration at present, usually only 25 minutes or so, and consumer needs to frequently replace battery ability
Realize prolonged use, this is affected for user experience.Reduce electric energy loss for extend unmanned plane cruise duration,
It is particularly important for satisfaction of users to improve.The power consumption of unmanned plane dynamical system accounts for unmanned plane complete machine power consumption
70%, therefore, the power consumption efficiency for promoting unmanned plane dynamical system is very crucial for reducing unmanned plane electric energy loss.In unmanned plane
In dynamical system, electric energy loss includes mainly that electricity adjusts loss and two parts of the loss of electric machine, the wherein loss of electric machine to occupy nobody again
The major part of electric energy loss in motor-driven Force system.Therefore, the loss of electric machine is reduced for reducing the dynamical system of unmanned plane
For electric energy loss, the whole efficiency to improve unmanned plane dynamical system, it is of great significance.It is learnt by experimental analysis,
The loss of motor and carrier frequency are closely bound up, and " carrier frequency " refers to that electricity adjusts the frequency of Mos pipes conducting and shutdown in hardware circuit.For
The different rotating speeds of motor so that the carrier frequency that the loss of motor reaches required when minimum is again different.In current existing skill
In art, carrier frequency is set as fixed value mostly, rarely has in the full speed range that motor operates, and is arranged for different rotating speeds different
Carrier frequency, to reduce the technology of the loss of electric machine.
Invention content
In order to solve the above-mentioned technical problem, the embodiment of the present invention provides a kind of method and apparatus reducing the loss of electric machine.It is logical
Methods and apparatus of the present invention is crossed, different carrier frequency is matched for the different rotating speeds of motor, to ensure the full speed operated in motor
In range, the loss of motor reaches minimum, to improve the whole efficiency of unmanned plane dynamical system.
In order to solve the above-mentioned technical problem, the embodiment of the present invention provides following technical scheme:
A method of the loss of electric machine is reduced, including:Obtain motor current rotating speed N;Determine what the current rotating speed was located at
Preset rotating speed Qu Jian [Nn, Nn+1];Obtain left end point N in the rotating speed sectionnCorresponding carrier frequency fnAnd the rotating speed section
Interior right endpoint Nn+1Corresponding carrier frequency fn+1, wherein when the value of the rotating speed of the motor is NnWhen, the loss of the motor is adjusted in electricity
The frequency of the conducting of Mos pipes and shutdown is f in hardware circuitnWhen it is minimum, when the value of the rotating speed of the motor is Nn+1When, the electricity
The loss of machine frequency of the conducting of Mos pipes and shutdown in the electricity adjusts hardware circuit is fn+1When it is minimum;According to fnAnd fn+1, lead to
It overloads frequency calculation formula and calculates the motor when current rotating speed N is rotated, the loss of the motor reaches required when minimum
Carrier frequency f (N);It is the carrier frequency being calculated that the electricity, which is adjusted the conducting of Mos pipes and the frequency error factor of shutdown in hardware circuit,.
Further, the carrier frequency calculation formula is
Further, the method further includes:Determine that the value when the rotating speed of the motor is the endpoint in the rotating speed section
When value, the loss of the motor reaches the frequency that electricity when minimum adjusts Mos pipes conducting and shutdown in hardware circuit.
Further, the frequency that the electricity adjusts Mos pipes conducting and shutdown in hardware circuit is adjusted as follows, until
The loss for obtaining the motor reaches the frequency that electricity when minimum adjusts Mos pipes conducting and shutdown in hardware circuit:
Determine that electricity described in time period t adjusts the frequency f of Mos pipes conducting and shutdown in hardware circuittAnd the motor is flat
Equal power Wt;
Determine that the electricity of time period t+1 adjusts the frequency f of Mos pipes conducting and shutdown in hardware circuitt+1And the motor
Mean power Wt+1;
If ft+1>ft, and Wt+1<Wt, in ft+1On the basis of increase electricity described in subsequent time period t+2 and adjust in hardware circuit
The frequency with shutdown is connected in Mos pipes;If ft+1>ft, and Wt+1>Wt, in ftOn the basis of reduce electricity described in subsequent time period t+2
Adjust the frequency of Mos pipes conducting and shutdown in hardware circuit;If ft+1<ft, and Wt+1<Wt, in ft+1On the basis of reduce it is lower for the moment
Between electricity described in section t+2 adjust the frequency of Mos pipes conducting and shutdown in hardware circuit;If ft+1<ft, and Wt+1>Wt, in ftBasis
The upper frequency for increasing electricity described in subsequent time period t+2 and adjusting Mos pipes conducting and shutdown in hardware circuit.
Further, the frequency increased or decreased is preset value;Alternatively, the frequency variation increased or decreased is default
Percentage.
Further, it is determined that the mean power W of motor described in time period tt, including:Step A:The motor operates one section
Time;Step B:JudgeValue whether be less than predetermined threshold value, wherein Pin_n,Pin_n_minAnd Pin_n_maxPoint
Not Wei in time period t it is described electricity adjust hardware circuit in Mos pipes conducting with shutdown frequency be ftThe average work(of Shi Suoshu motors
Rate, minimum power and maximum power;Step C:IfValue be less than predetermined threshold value, then by Pin_nValue record
For the mean power W of the motor in time period tt;IfValue be greater than or equal to predetermined threshold value, then motor
It remains in operation a period of time, then executes step B.
Further, the predetermined threshold value is less than 10%.
Further, before the power for determining the motor, it is low that single order is carried out to acquired d shaft currents and q shaft currents
Pass filter processing.
In order to solve the above-mentioned technical problem, the embodiment of the present invention also provides a kind of device reducing the loss of electric machine, including:When
Preceding rotating speed acquisition module, for obtaining motor current rotating speed N;Rotating speed interval determination module, for determining the current rotating speed position
In preset rotating speed Qu Jian [Nn, Nn+1];Carrier-frequency capture module, for obtaining left end point N in the rotating speed sectionnCorresponding load
Frequency fnAnd right endpoint N in the rotating speed sectionn+1Corresponding carrier frequency fn+1, wherein when the value of the rotating speed of the motor is NnWhen,
The loss of motor frequency of the conducting of Mos pipes and shutdown in electricity adjusts hardware circuit is fnWhen it is minimum, when turning for the motor
The value of speed is Nn+1When, Mos pipes are connected in the electricity adjusts hardware circuit and the frequency of shutdown is f for the loss of the motorn+1When
It is minimum;Carrier frequency computing module, for according to fnAnd fn+1, the motor is calculated by carrier frequency calculation formula and is turned in current rotating speed N
When dynamic, the loss of the motor reaches carrier frequency f (N) required when minimum;Carrier frequency handover module, for the electricity to be adjusted hardware
The conducting of Mos pipes and the frequency error factor of shutdown are the carrier frequency being calculated in circuit.
Further, the carrier frequency calculation formula is
Further, described device further includes carrier frequency determining module, for determining that the value of the rotating speed when the motor is institute
When stating the endpoint value in rotating speed section, the loss of the motor reaches electricity when minimum and adjusts Mos pipes conducting in hardware circuit and close
Disconnected frequency.
Further, the carrier frequency determining module adjusts the electricity and adjusts Mos pipes conducting in hardware circuit as follows
With the frequency of shutdown, until the loss for obtaining the motor reaches when minimum, Mos pipes are connected and close in the electricity tune hardware circuit
Disconnected frequency:
Determine that electricity described in time period t adjusts the frequency f of Mos pipes conducting and shutdown in hardware circuittAnd the motor is flat
Equal power Wt;
Determine that the electricity of time period t+1 adjusts the frequency f of Mos pipes conducting and shutdown in hardware circuitt+1And the motor
Mean power Wt+1;
If ft+1>ft, and Wt+1<Wt, in ft+1On the basis of increase electricity described in subsequent time period t+2 and adjust in hardware circuit
The frequency with shutdown is connected in Mos pipes;If ft+1>ft, and Wt+1>Wt, in ftOn the basis of reduce electricity described in subsequent time period t+2
Adjust the frequency of Mos pipes conducting and shutdown in hardware circuit;If ft+1<ft, and Wt+1<Wt, in ft+1On the basis of reduce it is lower for the moment
Between electricity described in section t+2 adjust the frequency of Mos pipes conducting and shutdown in hardware circuit;If ft+1<ft, and Wt+1>Wt, in ftBasis
The upper frequency for increasing electricity described in subsequent time period t+2 and adjusting Mos pipes conducting and shutdown in hardware circuit.
Further, the frequency increased or decreased is preset value;Alternatively, the frequency variation increased or decreased is default
Percentage.
Further, the carrier frequency determining module determines the mean power W of motor described in time period tt, including:Step A:
Described motor operating a period of time;Step B:JudgeValue whether be less than predetermined threshold value, wherein Pin_n,
Pin_n_minAnd Pin_n_maxIt is f that the electricity, which adjusts the frequency of the conducting of Mos pipes and shutdown in hardware circuit, respectively in time period ttWhen
Mean power, minimum power and the maximum power of the motor;Step C:IfValue be less than predetermined threshold value,
Then by Pin_nValue be recorded as the mean power W of the motor in time period tt;IfValue be greater than or equal to
Predetermined threshold value, then motor remain in operation a period of time, then execute step B.
Further, the predetermined threshold value is less than 10%.
Further, before the carrier frequency determining module determines the power of the motor, to acquired d shaft currents and q
Shaft current carries out first-order low-pass wave processing.
Beneficial effects of the present invention:The method and apparatus of the reduction loss of electric machine proposed by the invention are by calculating, for electricity
The different rotating speeds of machine operating match different carrier frequency, it is ensured that in the full speed range of motor operating, no matter the rotating speed of motor is
How much, all adjust Mos pipes conducting in hardware circuit and the frequency error factor turned off for so that the loss of motor reaches minimum when institute electricity
The frequency needed makes the whole efficiency of unmanned plane dynamical system be promoted to reduce the loss of motor.
Description of the drawings
Fig. 1 is that the electricity of unmanned plane adjusts the structural schematic diagram of hardware circuit;
Fig. 2 is the schematic diagram for showing the relationship between modulating wave and carrier wave;
Fig. 3 is to show that electricity adjusts the schematic diagram of the conducting and off state of upper and lower Mos pipes in hardware circuit;
Fig. 4 be by test obtain under two kinds of different carrier frequency, the relationship between the loss that the rotating speed and electricity of motor are adjusted
Curve graph;
Fig. 5 be by test obtain under two kinds of different carrier frequency, the relationship between the loss of the rotating speed and motor of motor
Curve graph;
Fig. 6 be by test obtain under two kinds of different carrier frequency, the rotating speed of motor and the dynamical system of unmanned plane it is whole
The curve graph of relationship between body efficiency;
Fig. 7 is the flow diagram of the method for the reduction loss of electric machine that one embodiment of the invention provides;
Fig. 8 is the average work(that time period t motor is determined in the method for reducing the loss of electric machine that one embodiment of the invention provides
Rate WtThe step of flow diagram;
Fig. 9 is the structure diagram of the device for the reduction loss of electric machine that another embodiment of the present invention provides.
Specific implementation mode
Below by specific implementation mode combination attached drawing, invention is further described in detail.In the following embodiments and the accompanying drawings
In, many datail descriptions are in order to enable the present invention can be better understood.However, those skilled in the art can be without lifting an eyebrow
Recognize, which part feature is dispensed in varied situations, or can be by other methods, step, device, mould
Block is substituted.In some cases, the present invention it is relevant some operation there is no in the description show or describe, this be for
The core of the invention part is avoided to be flooded by excessive description, and to those skilled in the art, this is described in detail
A little relevant operations are not necessary, they can be complete according to the general technology knowledge of description and this field in specification
Understand relevant operation.
It is formed respectively in addition, feature described in this description, operation or feature can combine in any suitable way
Kind embodiment.Meanwhile each step in method description or action can also can be aobvious and easy according to those skilled in the art institute
The mode carry out sequence exchange or adjustment seen.Therefore, the various sequences in the description and the appended drawings are intended merely to clearly describe a certain
A embodiment is not meant to be necessary sequence, and wherein some sequentially must comply with unless otherwise indicated.
Fig. 1 to Fig. 5 describes inventor and is analyzed by the result to experiment test, obtains carrier frequency to electricity reconciliation motor
The influence of loss, and then visualize the process of the present invention.
As shown in Figure 1, for the structural schematic diagram of the unmanned electromechanical hardware circuit adjusted.In Fig. 1, UdcFor DC voltage, on
Switching tube G_A_u, G_B_u and G_C_u and lower switch pipe G_A_d, G_B_d and G_C_d are Mos pipes, and M is motor load.
Assuming that i in A phase currents such as Fig. 1aShown, when A phase currents are more than zero, modulating wave (i.e. sine wave in Fig. 2) (is schemed with carrier wave
Triangular wave in 2) between relationship as shown in Fig. 2, when the amplitude of modulating wave is more than the amplitude of carrier wave, the conducting of upper Mos pipes;Instead
It, lower Mos pipes conducting.The dead drive time needed for upper and lower Mos pipes switching is δ T (Fig. 3).
The carrier cycle T arbitrarily chosen is analyzed (as shown in dotted line frame in Fig. 2):As A phase currents iaIt is more than
When zero, the state of upper and lower shared four kinds of conductings and shutdown as shown in Figure 3 of Mos pipes.In figure 3, T is expressed as a carrier frequency week
Phase.The state of four kinds of conductings and shutdown is expressed as:State one (1,0), state two (0,0), state three (0,1) and state four
(0,0).Wherein, the number 1 in bracket indicates that the conducting of Mos pipes, number 0 indicate the shutdown of Mos pipes.Also, first in bracket
The conducting of Mos pipes and off state in digital representation, the conducting of the lower Mos pipes of second-order digit characterization in bracket and shutdown shape
State.
Mos pipes G_A_u conductings, lower Mos pipes G_A_d shutdowns in state one (1,0) expression;When electric current is more than zero, A phase electricity
Flow iaIt is walked from upper Mos pipes G_A_u, electricity at this time adjusts conducting resistance loss of the loss mainly including switching loss and Mos pipes.Shape
Mos pipes G_A_u and lower Mos pipes G_A_d are turned off in state two (0,0) expression;When electric current is more than zero, A phase currents iaFrom down tube
Diode is walked, and electricity tune loss at this time includes mainly switching loss and flows through the loss of diode.Similarly, state three (0,1)
Mos pipes G_A_u shutdowns, lower Mos pipes G_A_d conductings in expression;When electric current is more than zero, A phase currents iaFrom lower Mos pipes G_A_d
It walks, electricity at this time adjusts the loss mainly conduction loss including switching loss and Mos pipes.Mos pipes G_ in state 44 (0,0) expression
A_u and lower Mos pipes G_A_d are turned off;When electric current is more than zero, A phase currents iaIt is walked from down tube diode, electricity at this time adjusts loss
It is main including switching loss and to flow through the loss of diode.Similarly, the state of B phases and C phases can be analyzed.
" carrier frequency " refers to the frequency of Mos pipes (including upper Mos pipes and lower Mos pipes) conducting and shutdown in electricity adjusts hardware circuit
Rate.Change carrier frequency, refers to changing the number of the conducting of Mos pipes and shutdown in the electric cycle T m of as shown in Figure 2 one.Change carrier frequency
The change of turn-on time and dead time δ T is also resulted in, and then influences the size that electricity adjusts loss.Meanwhile change carrier frequency also can shadow
Ring the size of the loss of electric machine.
The relationship between loss and carrier frequency in order to probe into electricity tune, motor, inventor are respectively provided with 24kHz in testing
The different carrier frequency with 36kHz's, allow the motor of unmanned plane to be operated, and by counting and calculating, obtain motor under the two carrier frequency
Rotating speed and electricity adjust loss, motor loss and unmanned plane dynamical system whole efficiency between relationship, respectively such as
Shown in curve graph in fig. 4 to fig. 6:
Fig. 4 be by test obtain under two kinds of different carrier frequency, the relationship between the loss that the rotating speed and electricity of motor are adjusted
Curve graph.In Fig. 4, abscissa indicates that the rotating speed of motor, unit rpm, ordinate indicate the loss that electricity is adjusted, unit W.Figure
In solid line correspond to the relationship between the loss that the rotating speed of motor when motor operates under the carrier frequency of 24kHz and electricity are adjusted, in figure
Dotted line corresponds to the relationship between the loss that the rotating speed of motor and electricity are adjusted when motor operates under the carrier frequency of 36kHz.It can be with from figure
Learn, when the rotating speed of motor about in the range of 1000 to 7000rpm when, motor operated under the carrier frequency of 24kHz electricity adjust
Loss be consistently lower than motor operated under the carrier frequency of 36kHz electricity adjust loss;And when motor rotating speed about 7000 to
When within the scope of 9000rpm, the loss for the electricity tune that motor operates under the carrier frequency of 24kHz is operated with motor under the carrier frequency of 36kHz
Electricity adjust loss size alternately surmount each other.
Fig. 5 be by test obtain under two kinds of different carrier frequency, the relationship between the loss of the rotating speed and motor of motor
Curve graph.In Fig. 5, abscissa indicates that motor speed, unit rpm, ordinate indicate the loss of electric machine, unit W.In figure
Solid line corresponds to the relationship between the loss of the rotating speed and motor of motor when motor operates under the carrier frequency of 24kHz, the dotted line in figure
Relationship when corresponding motor operates under the carrier frequency of 36kHz between the loss of the rotating speed and motor of motor.It is known from figures that,
When the rotating speed of motor about in the range of 1000 to 3000rpm when, the loss for the motor that motor operates under the carrier frequency of 24kHz
The loss of the motor operated under the carrier frequency of 36kHz with motor is of substantially equal;And when the rotating speed of motor is more than 3000rpm, electricity
Loss of the loss for the motor that machine operates under the carrier frequency of 36kHz less than the motor that motor operates under the carrier frequency of 24kHz.
By the data result of Fig. 4, Fig. 5, finally obtain as shown in FIG. 6 in 24kHz and the different carrier frequency of two kinds of 36kHz
Under, the curve graph of the relationship between the rotating speed of motor and the whole efficiency of the dynamical system of unmanned plane.In Fig. 6, abscissa indicates
The rotating speed of motor, unit rpm, ordinate indicate the whole efficiency of the dynamical system of unmanned plane, unit %.Dotted line pair in figure
Relationship when motor being answered to be operated under the carrier frequency of 24kHz between the whole efficiency of the dynamical system of the rotating speed and unmanned plane of motor,
The whole efficiency of the dynamical system of the rotating speed and unmanned plane of motor when the corresponding motor of realization in figure operates under the carrier frequency of 36kHz
Between relationship.It is known from figures that, when the rotating speed of motor about in the range of 1000 to 3000rpm when, motor exists
When being operated under the carrier frequency of 36kHz more than motor of whole efficiency of the dynamical system of unmanned plane when being operated under the carrier frequency of 24kHz
Whole efficiency;And when the rotating speed of motor is more than 3000rpm, the power of unmanned plane when motor operates under the carrier frequency of 24kHz
The whole efficiency of system is less than whole efficiency when motor operates under the carrier frequency of 36kHz.By further it is found that passing through on Fig. 6
Change carrier frequency, the whole efficiency of the dynamical system of unmanned plane can be promoted from 70.2% to 72.6%, two percentages of improved efficiency
Point is for consumers by the cruise duration of increase by 50 seconds or so.
It follows that the change of carrier frequency influences the size of loss and the loss of electric machine that electricity is adjusted, for the different rotating speeds of motor,
Exist so that the loss of loss or motor that electricity is adjusted reaches minimum carrier frequency.It can by the ordinate value of comparison diagram 4 and Fig. 5
Know, the loss of motor occupies the major part of the electric energy loss in unmanned plane dynamical system, can by reducing the loss of motor
Improve the whole efficiency of unmanned plane dynamical system.
Based on this, applicant proposes a kind of method and apparatus reducing the loss of electric machine in the present invention, by calculating, for electricity
The different rotating speeds of machine operating match different carrier frequency, it is ensured that in the full speed range of motor operating, no matter the rotating speed of motor is
How much, all adjust Mos pipes conducting in hardware circuit and the frequency error factor turned off for so that the loss of motor reaches minimum when institute electricity
The frequency needed makes the whole efficiency of unmanned plane dynamical system be promoted to reduce the loss of motor.
In one embodiment, as described in Figure 7, a kind of method reducing the loss of electric machine is provided, this method includes following
Step S100~S140:
Step S100:Obtain motor current rotating speed N.
Step S110:Determine the preset rotating speed Qu Jian [ that the current rotating speed is located at;Nn, Nn+1]。
Step S120:Obtain left end point N in the rotating speed sectionnCorresponding carrier frequency fnAnd right end in the rotating speed section
Point Nn+1Corresponding carrier frequency fn+1, wherein when the value of the rotating speed of the motor is NnWhen, the loss of the motor adjusts hardware electricity in electricity
The frequency of the conducting of Mos pipes and shutdown is f in roadnWhen it is minimum, when the value of the rotating speed of the motor is Nn+1When, the damage of the motor
It is f to consume the frequency of the conducting of Mos pipes and shutdown in the electricity adjusts hardware circuitn+1When it is minimum.
Step S130:According to fnAnd fn+1, the motor is calculated when current rotating speed N is rotated by carrier frequency calculation formula,
The loss of the motor reaches carrier frequency f (N) required when minimum.
Step S140:It is the load being calculated that the electricity, which is adjusted the conducting of Mos pipes and the frequency error factor of shutdown in hardware circuit,
Frequently.
Each step will be specifically explained below.
In the step s 100, motor current rotating speed N refers to that the speed of current time motor operating, the speed can be electricity
Arbitrary speed in the full speed range of machine operating.In step s 110, the preset rotating speed area that the current rotating speed N is located at is determined
Jian [Nn, Nn+1].The rotating speed of motor is starting point and using maximum speed as terminal using minimum speed by the embodiment of the present invention, in electricity
The rotating speed of motor is divided into several rotating speed Qu Jians [ in the full speed range of machine;Nn, Nn+1], wherein n=0,1,2 ..., n are derived from so
Number.It should be noted that so-called rotating speed section is in addition to can Shi [ in the present invention;Nn, Nn+1]Situation, can also be (Nn,
Nn+),[Nn, Nn+1) or (Nn, Nn+1]Situation, that is to say, that the present invention in so-called rotating speed section may include endpoint (left end
Point NnAnd/or right endpoint Nn+1), can not also include endpoint (left end point NnAnd/or right endpoint Nn+1)。
In one implementation, the siding-to-siding block length in the rotating speed section of motor can be set as 500rpm, in other realities
In existing mode, the siding-to-siding block length in rotating speed section can also be set as other values, such as 250rpm.For example, when if motor operates
Velocity interval be 1000rpm to 9000rpm, using 500rpm as the siding-to-siding block length in rotating speed section, be with minimum speed 1000rpm
Starting point and using maximum speed 8000rpm as terminal, divides the rotating speed of motor, the rotating speed of motor is divided into as a result,
[1000,1500],[1500,2000],[2000,2500]…[7500,8000]Amount to 14 rotating speed sections.
In the step s 120, the preset rotating speed Qu Jian [ being located at according to current rotating speed N determined by step S110;Nn,
Nn+1], obtain left end point N in rotating speed sectionnCorresponding carrier frequency fnAnd right endpoint Nn+1Corresponding carrier frequency fn+1, fnAnd fn+1Value
It is stored in advance in the non-volatile memory medium or built-in storage of equipment.Specifically, in embodiments of the present invention, pass through survey
Examination predefines each rotating speed Qu Jian [Nn, Nn+1]Left end point NnCorresponding carrier frequency fnAnd right endpoint Nn+1Corresponding carrier frequency
fn+1.Left end point NnCorresponding " carrier frequency fn" refer to:When the value of the rotating speed of motor is NnWhen so that the loss of motor reaches minimum
When required carrier frequency;Right endpoint rotating speed Nn+1Corresponding carrier frequency " fn+1" refer to:When the value of the rotating speed of motor is Nn+1When, make
The loss for obtaining motor reaches carrier frequency required when minimum.
It is obtained by above-mentioned test as a result, being stored in the non-volatile memory medium or built-in storage of equipment, for executing step
It is read when rapid S120.Specifically, the value for obtaining and storing the rotating speed of motor makes when being respectively the endpoint value in each rotating speed section
The loss of motor reaches minimum carrier frequency, and the purpose is to the values according to these pre-stored carrier frequency, pass through carrier frequency calculation formula
Motor is calculated when arbitrary rotating speed N is rotated, the loss of motor reaches carrier frequency required when minimum, and electricity is adjusted hardware electricity
The conducting of Mos pipes and the frequency error factor of shutdown are the carrier frequency being calculated in road, so that the loss of motor remains most
It is small.
In step s 130, the f obtained according to step S120nAnd fn+1, motor is calculated current by carrier frequency calculation formula
When rotating speed N rotations, the loss of motor reaches carrier frequency f (N) required when minimum.It follows that due to first passing through survey in advance
When the value that examination obtains the rotating speed of motor is the endpoint value in every speed section so that the loss of motor reaches required when minimum
Therefore carrier frequency when the different rotating speeds for motor match different carrier frequency, needs not move through test and determines each speed one by one
The loss of motor is made to reach carrier frequency f (N) required when minimum corresponding to degree point, but only that arbitrary by determining
The preset rotating speed section that current rotating speed N is located at is calculated further according to the corresponding carrier frequency of endpoint value in the rotating speed section by carrier frequency
Formula can be calculated under current rotating speed N, and the loss of motor reaches carrier frequency f (N) required when minimum.
It should be understood that in an embodiment of the present invention, when dividing rotating speed section, siding-to-siding block length could be provided as arbitrarily
Value, siding-to-siding block length is arranged more in short-term, the carrier frequency corresponding to arbitrary current rotating speed N being calculated by Carrier frequency configuration formula
F (N) is also in contrast more accurate.
Preferably, which is
In the case where current rotating speed N is calculated after required carrier frequency, step S140 is executed:Electricity is adjusted into Mos in hardware circuit
It is the carrier frequency being calculated that pipe, which is connected with the frequency error factor of shutdown,.After switching carrier frequency, for current rotating speed N, the loss of motor
Minimum is reached.
By step S110~S140, realizes and match different carrier frequency for the different rotating speeds of motor, so that it is guaranteed that in electricity
In the full speed range of machine operating, no matter the rotating speed of motor is how many, all electricity is adjusted the frequency of Mos pipes conducting and shutdown in hardware circuit
Rate is switched to so that the loss of motor reaches frequency required when minimum, is significantly reduced the loss of electric machine, is farthest carried
The whole efficiency of dynamical system is risen.
The method of the reduction loss of electric machine of the embodiment of the present invention, it is current in motor by calculating when motor speed changes
Rotating speed under so that the loss of motor reaches the carrier frequency required by minimum, and electricity is adjusted the conducting of Mos pipes and shutdown in hardware circuit
Frequency error factor be calculate gained the carrier frequency, in real time be different motor speeds match different carrier frequency, it is ensured that electricity
When machine operates under different rotating speeds, the frequency error factor of the conducting of Mos pipes and shutdown in electricity tune hardware circuit is all in real time by system
Calculate gained makes the loss of electric machine reach carrier frequency required when minimum so that motor motor in different speed operatings
Loss is always minimum.To in the full speed range of motor operating, significantly reduce the loss of motor, farthest carry
The whole efficiency of dynamical system is risen.
In one embodiment, the method for the above-mentioned reduction loss of electric machine further includes:Determine that the value of the rotating speed when motor is
When the endpoint value in rotating speed section so that the frequency with shutdown is connected in Mos pipes in electricity tune hardware circuit when the loss of motor reaches minimum
Rate.In one implementation, the frequency with shutdown is connected in Mos pipes in adjustment electricity tune hardware circuit as follows, until
The loss for obtaining motor reaches the frequency that electricity when minimum adjusts Mos pipes conducting and shutdown in hardware circuit:
Determine the frequency f of Mos pipes conducting and shutdown in time period t electricity tune hardware circuittAnd the mean power W of motort;
Determine that+1 electricity of time period t adjusts the frequency f of Mos pipes conducting and shutdown in hardware circuitt+1And the mean power of motor
Wt+1;
If ft+1>ft, and Wt+1<Wt, in ft+1On the basis of increase subsequent time period t+2 electricity tune hardware circuits in Mos manage
The frequency of conducting and shutdown;If ft+1>ft, and Wt+1>Wt, in ftOn the basis of reduce subsequent time period t+2 electricity tune hardware circuits
The frequency of middle Mos pipes conducting and shutdown;If ft+1<ft, and Wt+1<Wt, in ft+1On the basis of reduce subsequent time period t+2 electricity tune
The frequency of Mos pipes conducting and shutdown in hardware circuit;If ft+1<ft, and Wt+1>Wt, in ftOn the basis of increase subsequent time period
The frequency of Mos pipes conducting and shutdown in t+2 electricity tune hardware circuits.Wherein, t=0,1,2 ..., t take natural number.
In one implementation, in above-mentioned steps, the frequency increased or decreased every time is preset value;At other
In realization method, the frequency variation increased or decreased every time is preset percentage.
For example, be the motor of 1000rpm to 9000rpm for the velocity interval of operating, it can be using 500rpm as rotating speed area
Between siding-to-siding block length, be starting point and using maximum speed 8000rpm as terminal using minimum speed 1000rpm, to the rotating speed of motor into
Row divides, as a result, the rotating speed Bei Huafenwei [ of motor;1000,1500],[1500,2000],[2000,2500]…[7500,
8000]Amount to 14 rotating speed sections.It is thus necessary to determine that when the value of the rotating speed of motor is respectively the total of this 14 rotating speed sections
When 15 endpoint values so that the frequency with shutdown is connected in Mos pipes in electricity tune hardware circuit when the loss of motor reaches minimum, below
The conducting of Mos pipes and the frequency of shutdown in hardware circuit is adjusted to be referred to as " carrier frequency " electricity.
Determine that the value when the rotating speed of motor is first rotating speed Qu Jian [ first;1000,1500]Left end point value 1000rpm
When so that the loss of motor reaches carrier frequency when minimum:
For example, setting the rotating speed of motor to 1000rpm, it sets initial carrier frequency to ft=30kHz, enable every time increase or
The Carrier frequency configuration of reduction is f=500Hz.It should be understood that set initial carrier frequency can be arbitrary value, set is each
The value of the carrier frequency increased or decreased may be arbitrary value.For the different endpoint rotating speeds in rotating speed section, initial carrier frequency is set, so
Constantly carrier frequency is adjusted on the basis of the initial carrier frequency by way of increasing carrier frequency or reducing carrier frequency afterwards, to obtain
When the value of the rotating speed of motor is the endpoint rotating speed so that the loss of motor reaches carrier frequency when minimum.Therefore, for rotating speed section
Different endpoint rotating speeds, the initial carrier frequency of setting may be the same or different.
Section t between at the beginning sets initial carrier frequency to ftWhen=30kHz, the mean power W of motor is calculated and recordedt,
Wherein, it is averaged by the value of the power of motor to being repeatedly calculated and obtains the mean power W of motort。
In time period t+1, carrier frequency is adjusted to ft+1。
In some implementations, the mode of adjustment carrier frequency can be to increase carrier frequency for the first time, then ft+1=ft+ f=30kHz+
500Hz=30.5kHz, it is f to calculate and record+1 carrier frequency of time period tt+1When motor mean power Wt+1.If Wt+1<Wt,
Show carrier frequency from ftIt is f to increaset+1Afterwards, the loss of motor reduces, this explanation, to f by way of increasing carrier frequencytIt is adjusted
It is correct, therefore, in ft+1On the basis of continue growing the carrier frequency of subsequent time period t+2, that is, ft+2=ft+1+ f=30.5kHz
+ 500Hz=31kHz, it is f to calculate and record+2 carrier frequency of time period tt+2When motor mean power Wt+2;If Wt+1>Wt, table
Bright carrier frequency is from ftIt is f to increaset+1Afterwards, the loss of motor increases, this explanation, to f by way of increasing carrier frequencytIt is adjusted simultaneously
It is incorrect, at this point, should be changed in ftOn the basis of reduce the carrier frequency of subsequent time period t+2, that is, ft+2=ft- f=30kHz-
500Hz=29.5kHz, it is f to calculate and record+2 carrier frequency of time period tt+2When motor mean power Wt+2.And so on, it shines
This mode continues the carrier frequency of adjustment time section t+3, t+4 ..., until the loss for obtaining motor reaches carrier frequency corresponding when minimum,
The carrier frequency is determined as when the value of the rotating speed of motor being first rotating speed Qu Jian [1000,1500]Left end point value 1000rpm when,
Frequency Mos pipes conducting in electricity tune hardware circuit when the loss of motor reaches minimum and turned off.
In other realization methods, the mode for adjusting carrier frequency for the first time can be to reduce carrier frequency, then ft+1=ft- f=
30kHz-500Hz=29.5kHz it is f to calculate and record+1 carrier frequency of time period tt+1When motor mean power Wt+1.If
Wt+1<Wt, show carrier frequency from ftIt is reduced to ft+1Afterwards, the loss of motor reduces, this explanation, to f by way of reducing carrier frequencyt
It is correct to be adjusted, therefore, in ft+1On the basis of continue to reduce the carrier frequency of subsequent time period t+2, that is, ft+2=ft+1-f
=29.5kHz-500Hz=29kHz, it is f to calculate and record+2 carrier frequency of time period tt+2When motor mean power Wt+2;If
Wt+1>Wt, show carrier frequency from ftIt is reduced to ft+1Afterwards, the loss of motor increases, this explanation, to f by way of reducing carrier frequencyt
It is adjusted and incorrect, at this point, should be changed in ftOn the basis of increase the carrier frequency of subsequent time period t+2, that is, ft+2=ft+f
=30kHz+500Hz=30.5kHz, it is f to calculate and record+2 carrier frequency of time period tt+2When motor mean power Wt+2.With this
Analogize, continue the carrier frequency of adjustment time section t+3, t+4 ... in this way, until the loss for obtaining motor reaches corresponding when minimum
Carrier frequency, by the carrier frequency be determined as when motor rotating speed value be first rotating speed Qu Jian [1000,1500]Left end point value
When 1000rpm, the frequency with shutdown is connected in Mos pipes in electricity tune hardware circuit when the loss of motor reaches minimum.
Pass through above step, it is determined that when the value of the rotating speed of motor is first rotating speed Qu Jian [1000,1500]Left end
When point value 1000rpm, the frequency with shutdown is connected in Mos pipes in electricity tune hardware circuit when the loss of motor reaches minimum.
Those skilled in the art, which are appreciated that, determines that the value when the rotating speed of motor is other rotating speeds section
Left end point value, right end point value when, when the loss of motor reaches minimum in electricity tune hardware circuit Mos pipes conducting with shutdown frequency
The step of with above-mentioned steps type, details are not described herein.
In above-mentioned steps, it is directed to each endpoint value in rotating speed section respectively, adjusts hardware circuit using f as to electricity every time
The variable quantity for the frequency that the frequency of middle Mos pipes conducting and shutdown uses when being adjusted all is recorded and is worked as after adjusting carrier frequency every time
The carrier frequency of preceding period and the mean power of motor pick out the power minimum of motor from each group of data by comparing
Corresponding carrier frequency in that group data is determined as the carrier frequency when the value of the rotating speed of motor is the rotating speed interval endpoint value,
So that the frequency with shutdown is connected in Mos pipes in electricity tune hardware circuit when the loss of motor reaches minimum.
In some embodiments, as shown in figure 8, determining the mean power W of motort, further comprise:
Step S200:Allow motor operating a period of time.
Step S210:JudgeValue whether be less than predetermined threshold value.Wherein, Pin_n,Pin_n_minWith
Pin_n_maxIt is f that electricity, which adjusts the frequency of the conducting of Mos pipes and shutdown in hardware circuit, respectively in time period ttWhen motor average work(
Rate, minimum power and maximum power.
Step S220:IfValue be less than predetermined threshold value, then by Pin_nValue be recorded as in time period t
The mean power W of motort;
Step S230:IfValue be greater than or equal to predetermined threshold value, then allow motor to remain in operation one section
Time is then back to step S210.
Predetermined threshold value is the constant being previously set in step S210.In some implementations, predetermined threshold value can be set
It is set to a constant for being less than 10%.
It will be understood by those skilled in the art that for same endpoint value rotating speed Nn, every time with preset value or in advance
If percentage increase or decrease electricity adjust hardware circuit in Mos pipes conducting with shutdown frequency after, the operating of motor can't horse
On settle out.Therefore, in one implementation, need in the mean power W for determining motortBefore, through the above steps
S200~S230 evaluates the stability of motor operating.
It, will in step S210The size of value be compared with the size of predetermined threshold value, purpose exists
In evaluation when motor is in rotating speed NnWhen lower operating, carrier frequency is adjusted to f in time period ttAfterwards, whether the operation of motor stablizes,
In, Pin_n,Pin_n_minAnd Pin_n_maxThe frequency of the conducting of Mos pipes and shutdown is in electricity tune hardware circuit respectively in time period t
ftWhen motor mean power, minimum power and maximum power.
If the operating of motor is not sufficiently stable,Value also can be relatively large, by motor unstable
In the state of the mean power P that is calculated when operatingin_nValue be recorded as the mean power W of motor in time period tt, eventually
Cause, identified when the value of the rotating speed of motor is the endpoint value in rotating speed section, the loss of motor reaches required when minimum
The value of carrier frequency is not accurate enough, to calculated under current rotating speed N by carrier frequency calculation formula so that the loss of motor reaches minimum
When required carrier frequency f (N) when error it is larger.
If judged,Value be greater than or equal to predetermined threshold value, show that the current operating of motor is also unstable
It is fixed, it needs after motor after a period of time of remaining in operation, re-starts evaluation.Only existValue relatively
Hour, for example, when less than predetermined threshold value, just the operating of motor at this time is evaluated as to be relatively stable, will then calculate gained
Newest Pin_nValue be recorded as in the time period t electricity to adjust the frequency of the conducting of Mos pipes and shutdown in hardware circuit being ftWhen electricity
The mean power W of machinet。
Allow in step s 200 motor operate a period of time length and allow motor to remain in operation in step S230
The length of a period of time can preset.In some implementations, can allow in step s 200 motor operate
The length of a period of time and the length of a period of time that motor remains in operation is allowed to be set as identical value, example in step S230
Such as, the time for allowing motor to operate in step s 200 is set as 1 minute, allow motor remains in operation in step S230 one
The section time is also set to 1 minute.In other realization methods, can also allow in step s 200 motor operate one section when
Between length and allow the length of a period of time that motor remains in operation to be set as different values in step S230, for example, existing
It allows the time that motor operates to be set as 1 minute in step S200, the time for allowing motor to remain in operation in step S230 is set
It is 30 seconds.
It in embodiments of the present invention, can be according to formula Pin=UdId+UqIqIt calculates, calculates the power P of motorin(including minimum
Power Pin_min, maximum power Pin_n_minAnd than multiple motors between minimum power and maximum power power value),
Middle Ud,Id,Uq,IqRespectively the d shaft voltages of motor, d shaft currents, q shaft voltages and q shaft currents.Due to passing through multiple repairing weld and meter
Calculate, thus obtain be multiple motors power value, be averaged to calculating the value of power of multiple motors of gained, so that it may
Obtain the mean power of motor.
In embodiments of the present invention, d axis (also referred to as d-axis) is to be able to obtain similar direct current with q axis (also referred to as quadrature axis)
The control characteristic of machine and two reference axis on a coordinate system being established on rotor.The coordinate system is synchronous with rotor to be turned
It is dynamic, wherein it is d axis to take the direction on the center line of rotor magnetic pole, and the direction perpendicular to rotor field is q axis.It thus will be electric
The mathematical model of machine is transformed under this coordinate system, it can be achieved that the decoupling of d axis and q axis, to which the control to motor be better achieved.
In one implementation, the voltage U of d axis is calculated by the d shaft current rings of the stator of motord, pass through electricity
The voltage U of q axis is calculated in the q shaft current rings of the stator of machineq, electric current loop therein refers to current feedback system, d axis electricity
Stream ring and q shaft current rings are pre-set in a device;By to threephase stator electric current IsIt is sampled and is calculated and obtain d axis
Electric current IdAnd the electric current I of q axisq, wherein threephase stator electric current IsIt can be sampled according to preset sample frequency.
Preferably, according to formula Pin=UdId+UqIqBefore the power for calculating motor, to acquired d shaft currents and q axis
Electric current carries out first-order low-pass wave processing, to eliminate interfering for the uncertain factor being subject to when obtaining sample rate current.
Judging as described aboveValue be less than predetermined threshold value, that is, judge at this time motor operating more
After stabilization, proceeds by sampling and calculate Ud,Id,Uq,Iq, and pass through formula Pin=UdId+UqIqP is calculatedin.By multiple
Sampling and calculating, obtain multiple PinValue after, to obtained multiple PinValue be averaged, to obtain Pin_nValue.It will
Pin_nValue be recorded as in the time period t electricity to adjust the frequency of the conducting of Mos pipes and shutdown in hardware circuit being ftWhen motor be averaged
Power Wt。
It will appreciated by the skilled person that the length of time period t can be configured according to actual conditions, lead to
Often, the length of set time period t is longer, and the result being calculated is more accurate.
In one embodiment, as shown in figure 9, the structure diagram of the device for the reduction loss of electric machine provided by the invention.
It should be noted that since the device embodiment in the embodiment of the present invention is based on identical invention with embodiment of the method
Design, the technology contents in embodiment of the method are equally applicable to device embodiment, therefore, in device embodiment with embodiment of the method
Details are not described herein for identical technology contents.
The device includes current rotating speed acquisition module 300, rotating speed interval determination module 310, carrier-frequency capture module 320, carries
Frequency computing module 330 and carrier frequency handover module 340, wherein:
Current rotating speed acquisition module 300 is for obtaining motor current rotating speed N.
Rotating speed interval determination module 310 is for determining the preset rotating speed Qu Jian [ that current rotating speed N is located at;Nn, Nn+1]。
Carrier-frequency capture module 320 is for obtaining left end point N in rotating speed sectionnCorresponding carrier frequency fnAnd it is right in rotating speed section
Endpoint Nn+1Corresponding carrier frequency fn+1, wherein when the value of the rotating speed of the motor is NnWhen, the loss of the motor adjusts hardware in electricity
The frequency of the conducting of Mos pipes and shutdown is f in circuitnWhen it is minimum, when the value of the rotating speed of the motor is Nn+1When, the motor
It is f that the frequency of the conducting of Mos pipes and shutdown in the electricity adjusts hardware circuit, which is lost,n+1When it is minimum.
Carrier frequency computing module 330 is used for according to fnAnd fn+1, motor is calculated in current rotating speed N by frequency calculation formula
When rotation, the loss of motor reaches carrier frequency f (N) required when minimum.
It is to calculate that carrier frequency handover module 340, which is used to electricity adjusting the frequency error factor of the conducting of Mos pipes and shutdown in hardware circuit,
The frequency f (N) arrived.
Preferably, the carrier frequency calculation formula is
In one implementation, the device of the above-mentioned reduction loss of electric machine can be unmanned plane.Current rotating speed obtains mould
Block 300, rotating speed interval determination module 310, carrier-frequency capture module 320, carrier frequency computing module 330 and carrier frequency handover module 340 can
To be any one in electric mode transfer block, micro controller unit, microprocessor unit.Optionally, current rotating speed acquisition module
300, in rotating speed interval determination module 310, carrier-frequency capture module 320, carrier frequency computing module 330 and carrier frequency handover module 340
One or more can be the same electric mode transfer block or the same micro controller unit or the same microprocessor unit.
During motor operates, when changing the rotating speed of motor, current rotating speed acquisition module 300 will be real-time
The motor current rotating speed N got is transmitted to rotating speed interval determination module 310;Rotating speed interval determination module 310 obtains motor and works as
After preceding rotating speed N, the preset rotating speed section that current rotating speed N is located at is determined;Nn, Nn+1], and by identified rotating speed Qu Jian [Nn,
Nn+1]It is transmitted to carrier-frequency capture module 320, the preset rotating speed section being located at according to current rotating speed N for carrier-frequency capture module 320
[Nn, Nn+1], obtain and rotating speed Qu Jian [Nn, Nn+1]Left and right endpoint rotating speed NnCorresponding carrier frequency fnWith right endpoint rotating speed Nn+1Institute
Corresponding carrier frequency fn+1;Motor current rotating speed N, the rotating speed that carrier frequency computing module 330 is sent according to current rotating speed acquisition module 300
The rotating speed Qu Jian [ that interval determination module 310 is sent;Nn, Nn+1]Left end point NnWith right endpoint Nn+1And carrier-frequency capture module 320
The rotating speed Qu Jian [ of transmission;Nn, Nn+1]Left end point rotating speed NnCorresponding carrier frequency fnWith right endpoint rotating speed Nn+1Corresponding carrier frequency
fn+1, it is calculated under current rotating speed N so that the loss of motor reaches minimum carrier frequency f (N);Carrier frequency computing module 330 is counted
Obtained carrier frequency f (N) is transmitted to carrier frequency handover module 340;Finally, electricity is adjusted Mos in hardware circuit by carrier frequency handover module 340
It is the carrier frequency f (N) being calculated that pipe, which is connected with the frequency error factor of shutdown,.
When switching motor speed, the device of the reduction loss of electric machine of the embodiment obtains mould by current rotating speed
Block 300, rotating speed interval determination module 310, carrier-frequency capture module 320, carrier frequency computing module 330 and carrier frequency handover module 340
Above-mentioned action carries out real-time monitoring to carrier frequency, and when ensureing that motor operates under arbitrary rotating speed, electricity adjusts Mos pipes in hardware circuit to lead
The logical frequency with shutdown is all the frequency when loss of electric machine being made to reach minimum, to minimize the loss of electric machine.
In some embodiments, the device of the reduction loss of electric machine of the invention further includes carrier frequency determining module.Carrier frequency determines
Module is rotating speed Qu Jian [ for determining the value when the rotating speed of motor;Nn, Nn+1]Endpoint value when, when the loss of motor reaches minimum
Electricity adjusts the frequency of Mos pipes conducting and shutdown in hardware circuit.That is, carrier frequency determining module is for determining rotating speed Qu Jian [Nn, Nn+1]'s
Left end point NnCorresponding carrier frequency fnAnd right endpoint Nn+1Corresponding carrier frequency fn+1。
In one implementation, carrier frequency determining module can be electric mode transfer block, micro controller unit, microprocessor unit
In any one.In one implementation, what can be determined carrier frequency determining module is corresponding with the endpoint value in rotating speed section
Carrier frequency is stored in the non-volatile memory medium or built-in storage of equipment, for above-mentioned carrier-frequency capture module 320 according to working as forward
The preset rotating speed Qu Jian [ that fast N is located at;Nn, Nn+1], obtain and rotating speed Qu Jian [Nn, Nn+1]Left and right endpoint rotating speed NnCorresponding
Carrier frequency fnWith right endpoint rotating speed Nn+1Corresponding carrier frequency fn+1。
It should be noted that it is the reduction loss of electric machine for being necessarily placed at the embodiment of the present invention that carrier frequency determining module, which is not,
Device in module.In some implementations, the reduction motor damage in the embodiment of the present invention is arranged in carrier frequency determining module
In the device of consumption;And in other realization methods, without reduction carrier frequency determining module being arranged in the embodiment of the present invention
In the device of the loss of electric machine, but the left end point N in every speed section is calculated using carrier frequency determining module in advancenCorresponding load
Frequency fnAnd right endpoint Nn+1Corresponding carrier frequency fn+1, and will calculate gained carrier frequency be stored in the embodiment of the present invention reduction electricity
In the device of machine loss.Preferably, the carrier frequency obtained by above-mentioned calculating is stored in the reduction loss of electric machine of the embodiment of the present invention
Device non-volatile memory medium or built-in storage in, for carrier-frequency capture module 320 execute task when read.
Preferably, carrier frequency determining module adjusts the frequency that electricity adjusts Mos pipes conducting and shutdown in hardware circuit as follows
Rate, until the frequency with shutdown is connected in Mos pipes in electricity tune hardware circuit when the loss for obtaining motor reaches minimum:
Determine the frequency f that Mos pipes are opened and turned off in moment section t electricity tune hardware circuitstAnd the mean power W of motort;
Determine the frequency f that Mos pipes are opened and turned off in moment section t+1 electricity tune hardware circuitst+1And the mean power of motor
Wt+1;
If ft+1>ft, and Wt+1<Wt, in ft+1On the basis of increase subsequent time period t+2 electricity tune hardware circuits in Mos manage
Open the frequency with shutdown;If ft+1>ft, and Wt+1>Wt, in ftOn the basis of reduce subsequent time period t+2 electricity tune hardware circuits
Middle Mos pipes open the frequency with shutdown;If ft+1<ft, and Wt+1<Wt, in ft+1On the basis of reduce subsequent time period t+2 electricity tune
The frequency of Mos pipes conducting and shutdown in hardware circuit;If ft+1<ft, and Wt+1>Wt, in ftOn the basis of increase subsequent time period
The frequency of Mos pipes conducting and shutdown in t+2 electricity tune hardware circuits.Wherein, t=0,1,2 ..., t take natural number.
In one implementation, in above-mentioned steps, the frequency increased or decreased every time is preset value;At other
In realization method, the frequency variation increased or decreased every time is preset percentage.
In some embodiments, carrier frequency determining module determines the mean power W of motort, including:
Allow motor operating a period of time;
JudgeValue whether be less than predetermined threshold value.Wherein, Pin_n,Pin_n_minAnd Pin_n_maxRespectively
It is f that the electricity, which adjusts the frequency that Mos pipes are opened and turned off in hardware circuit, in time period ttWhen the mean power of motor, least work
Rate and maximum power;
IfValue be less than predetermined threshold value, then by Pin_nValue be recorded as being averaged for motor in time period t
Power Wt;IfValue be greater than or equal to predetermined threshold value, then motor remain in operation a period of time, be then back to
Above-mentioned judgementValue whether be less than predetermined threshold value the step of.
Predetermined threshold value in above-mentioned steps is the constant being previously set.It in some implementations, can be by predetermined threshold value
It is set as a constant for being less than 10%.
In some implementations, carrier frequency determining module is before the power for calculating motor, to acquired d shaft currents and q
Shaft current carries out first-order low-pass wave processing.
Since the device embodiment in the embodiment of the present invention is based on identical inventive concept with embodiment of the method, method is implemented
Technology contents in example are equally applicable to device embodiment, therefore, in device embodiment in technology identical with embodiment of the method
Details are not described herein for appearance.
The device of the reduction loss of electric machine through the embodiment of the present invention, when motor speed changes, by calculating in motor
Under current rotating speed so that the loss of motor reaches the carrier frequency required by minimum, and by electricity adjust in hardware circuit the conducting of Mos pipes with
The frequency error factor of shutdown is the carrier frequency for calculating gained, to be that different motor speeds matches different carrier frequency in real time, really
When guarantor's motor operates under different rotating speeds, electricity is all adjusted the frequency of the conducting of Mos pipes and shutdown in hardware circuit to cut by system in real time
Be changed to calculate gained so that the loss of electric machine reaches carrier frequency required when minimum so that motor is electric in different speed operating
The loss of machine is always minimum.To in the full speed range of motor operating, significantly reduce the loss of motor, utmostly
Ground improves the whole efficiency of dynamical system.
The embodiment of the present invention also provides a kind of unmanned plane, which includes processor and the storage with the processor communication
Device, the method which executes the reduction loss of electric machine in embodiment present invention as described above.The processor can be micro-
Controller unit or microprocessor unit.
It will be recognized by one of ordinary skill in the art that the realization of all or part of flow in above-described embodiment method can lead to
The relevant hardware of computer program instructions is crossed to complete, the program can be stored in a non-volatile computer and storage can be read
In medium, the program is when being executed, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, the storage medium can
For magnetic disc, CD, read-only memory (stator winding resistance Read-OnlyMemory, stator winding resistance ROM) etc..
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (16)
1. a kind of method reducing the loss of electric machine, which is characterized in that including:
Obtain motor current rotating speed N;
Determine the preset rotating speed Qu Jian [ that the current rotating speed is located at;Nn, Nn+1];
Obtain left end point N in the rotating speed sectionnCorresponding carrier frequency fnAnd right endpoint N in the rotating speed sectionn+1Corresponding load
Frequency fn+1, wherein when the value of the rotating speed of the motor is NnWhen, loss Mos pipes conducting in electricity adjusts hardware circuit of the motor
Frequency with shutdown is fnWhen it is minimum, when the value of the rotating speed of the motor is Nn+1When, the loss of the motor is adjusted firmly in the electricity
The frequency of the conducting of Mos pipes and shutdown is f in part circuitn+1When it is minimum;
According to fnAnd fn+1, the motor is calculated when current rotating speed N is rotated by carrier frequency calculation formula, the loss of the motor
Reach carrier frequency f (N) required when minimum;
It is the carrier frequency being calculated that the electricity, which is adjusted the conducting of Mos pipes and the frequency error factor of shutdown in hardware circuit,.
2. the method according to claim 1 for reducing the loss of electric machine, which is characterized in that the carrier frequency calculation formula is
3. method as claimed in claim 1 or 2, which is characterized in that the method further includes:
It determines when the value of the rotating speed of the motor is the endpoint value in the rotating speed section, when the loss of the motor reaches minimum
The electricity adjusts the frequency of Mos pipes conducting and shutdown in hardware circuit.
4. method as claimed in claim 3, which is characterized in that adjust the electricity as follows and adjust Mos in hardware circuit
The frequency of pipe conducting and shutdown, until Mos pipes are led in the electricity tune hardware circuit when reaching minimum for the loss for obtaining the motor
The logical frequency with shutdown:
Determine that electricity described in time period t adjusts the frequency f of Mos pipes conducting and shutdown in hardware circuittAnd the mean power of the motor
Wt;
Determine that the electricity of time period t+1 adjusts the frequency f of Mos pipes conducting and shutdown in hardware circuitt+1And the motor is averaged
Power Wt+1;
If ft+1>ft, and Wt+1<Wt, in ft+1On the basis of increase electricity described in subsequent time period t+2 Mos in hardware circuit adjusted to manage
The frequency of conducting and shutdown;If ft+1>ft, and Wt+1>Wt, in ftOn the basis of reduce electricity described in subsequent time period t+2 and adjust hardware
The frequency of Mos pipes conducting and shutdown in circuit;If ft+1<ft, and Wt+1<Wt, in ft+1On the basis of reduce subsequent time period t+2
The electricity adjusts the frequency of Mos pipes conducting and shutdown in hardware circuit;If ft+1<ft, and Wt+1>Wt, in ftOn the basis of increase under
Electricity described in one period t+2 adjusts the frequency of Mos pipes conducting and shutdown in hardware circuit.
5. method as claimed in claim 4, which is characterized in that the frequency increased or decreased is preset value;Alternatively, increase or
The frequency variation of reduction is preset percentage.
6. method as described in claim 4 or 5, which is characterized in that determine the mean power W of motor described in time period tt, packet
It includes:
Step A:Described motor operating a period of time;
Step B:JudgeValue whether be less than predetermined threshold value, wherein Pin_n,Pin_n_minAnd Pin_n_maxRespectively
It is f for the electricity adjusts the conducting of Mos pipes and the frequency of shutdown in hardware circuit in time period ttThe mean power of Shi Suoshu motors,
Minimum power and maximum power;
Step C:IfValue be less than predetermined threshold value, then by Pin_nValue be recorded as the motor in time period t
Mean power Wt;IfValue be greater than or equal to predetermined threshold value, then motor remain in operation a period of time, so
Step B is executed afterwards.
7. method as claimed in claim 6, which is characterized in that the predetermined threshold value is less than 10%.
8. the method as described in any in claim 4-7, which is characterized in that before the power for determining the motor, to being obtained
The d shaft currents and q shaft currents taken carries out first-order low-pass wave processing.
9. a kind of device reducing the loss of electric machine, which is characterized in that including:
Current rotating speed acquisition module, for obtaining motor current rotating speed N;
Rotating speed interval determination module, the preset rotating speed Qu Jian [ being located at for determining the current rotating speed;Nn, Nn+1];
Carrier-frequency capture module, for obtaining left end point N in the rotating speed sectionnCorresponding carrier frequency fnAnd in the rotating speed section
Right endpoint Nn+1Corresponding carrier frequency fn+1, wherein when the value of the rotating speed of the motor is NnWhen, the loss of the motor is adjusted firmly in electricity
The frequency of the conducting of Mos pipes and shutdown is f in part circuitnWhen it is minimum, when the value of the rotating speed of the motor is Nn+1When, the motor
Loss it is described electricity adjust hardware circuit in Mos pipes conducting with shutdown frequency be fn+1When it is minimum;
Carrier frequency computing module, for according to fnAnd fn+1, the motor is calculated by carrier frequency calculation formula and is rotated in current rotating speed N
When, the loss of the motor reaches carrier frequency f (N) required when minimum;
Carrier frequency handover module is to be calculated for the electricity to be adjusted the frequency error factor of the conducting of Mos pipes and shutdown in hardware circuit
Carrier frequency.
10. the device according to claim 9 for reducing the loss of electric machine, which is characterized in that the carrier frequency calculation formula is
11. device according to claim 9 or 10, which is characterized in that further include carrier frequency determining module, work as institute for determination
When the value for stating the rotating speed of motor is the endpoint value in the rotating speed section, the loss of the motor reaches electricity when minimum and adjusts hardware
The frequency of Mos pipes conducting and shutdown in circuit.
12. device as claimed in claim 11, which is characterized in that described in the carrier frequency determining module adjusts as follows
Electricity adjusts the frequency of Mos pipes conducting and shutdown in hardware circuit, until the loss for obtaining the motor reaches electricity when minimum and adjusts
The frequency of Mos pipes conducting and shutdown in hardware circuit:
Determine that electricity described in time period t adjusts the frequency f of Mos pipes conducting and shutdown in hardware circuittAnd the mean power of the motor
Wt;
Determine that the electricity of time period t+1 adjusts the frequency f of Mos pipes conducting and shutdown in hardware circuitt+1And the motor is averaged
Power Wt+1;
If ft+1>ft, and Wt+1<Wt, in ft+1On the basis of increase electricity described in subsequent time period t+2 Mos in hardware circuit adjusted to manage
The frequency of conducting and shutdown;If ft+1>ft, and Wt+1>Wt, in ftOn the basis of reduce electricity described in subsequent time period t+2 and adjust hardware
The frequency of Mos pipes conducting and shutdown in circuit;If ft+1<ft, and Wt+1<Wt, in ft+1On the basis of reduce subsequent time period t+2
The electricity adjusts the frequency of Mos pipes conducting and shutdown in hardware circuit;If ft+1<ft, and Wt+1>Wt, in ftOn the basis of increase under
Electricity described in one period t+2 adjusts the frequency of Mos pipes conducting and shutdown in hardware circuit.
13. device as claimed in claim 12, which is characterized in that the frequency increased or decreased is preset value;Alternatively, increasing
Or the frequency variation of reduction is preset percentage.
14. device as described in claim 12 or 13, which is characterized in that the carrier frequency determining module determines described in time period t
The mean power W of motort, including:
Step A:Described motor operating a period of time;
Step B:JudgeValue whether be less than predetermined threshold value, wherein Pin_n,Pin_n_minAnd Pin_n_maxRespectively
It is f for the electricity adjusts the conducting of Mos pipes and the frequency of shutdown in hardware circuit in time period ttThe mean power of Shi Suoshu motors,
Minimum power and maximum power;
Step C:IfValue be less than predetermined threshold value, then by Pin_nValue be recorded as the motor in time period t
Mean power Wt;IfValue be greater than or equal to predetermined threshold value, then motor remain in operation a period of time, so
Step B is executed afterwards.
15. device as claimed in claim 14, which is characterized in that the predetermined threshold value is less than 10%.
16. the device as described in any in claim 12-15, which is characterized in that described in being determined in the carrier frequency determining module
Before the power of motor, first-order low-pass wave processing is carried out to acquired d shaft currents and q shaft currents.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710232961.9A CN108696224B (en) | 2017-04-11 | 2017-04-11 | Method and device for reducing motor loss |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710232961.9A CN108696224B (en) | 2017-04-11 | 2017-04-11 | Method and device for reducing motor loss |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108696224A true CN108696224A (en) | 2018-10-23 |
| CN108696224B CN108696224B (en) | 2020-06-12 |
Family
ID=63843535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710232961.9A Active CN108696224B (en) | 2017-04-11 | 2017-04-11 | Method and device for reducing motor loss |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108696224B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109510563A (en) * | 2018-11-08 | 2019-03-22 | 珠海格力电器股份有限公司 | Control method and system for suppressing motor current harmonic and storage medium |
| CN114094904A (en) * | 2021-11-09 | 2022-02-25 | 一汽解放汽车有限公司 | Carrier frequency scheduling method, carrier frequency scheduling device, computer equipment and storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102362427A (en) * | 2009-03-24 | 2012-02-22 | 株式会社Ihi | Device and method for power-saving driving of device having same load pattern |
| EP2713501A2 (en) * | 2012-09-28 | 2014-04-02 | Hitachi, Ltd. | PWM control method and driving system of AC motor |
| CN104679067A (en) * | 2014-12-23 | 2015-06-03 | 北京首钢股份有限公司 | Cooling fan variable-frequency control method and device |
| CN106288235A (en) * | 2016-09-30 | 2017-01-04 | 广东美的制冷设备有限公司 | Energy-saving control method, controller and air-conditioning |
| CN106357178A (en) * | 2016-09-30 | 2017-01-25 | 中车株洲电力机车研究所有限公司 | Method for optimum controlling for electric transmission system of low-speed direct-drive wind turbine generator |
-
2017
- 2017-04-11 CN CN201710232961.9A patent/CN108696224B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102362427A (en) * | 2009-03-24 | 2012-02-22 | 株式会社Ihi | Device and method for power-saving driving of device having same load pattern |
| EP2713501A2 (en) * | 2012-09-28 | 2014-04-02 | Hitachi, Ltd. | PWM control method and driving system of AC motor |
| CN104679067A (en) * | 2014-12-23 | 2015-06-03 | 北京首钢股份有限公司 | Cooling fan variable-frequency control method and device |
| CN106288235A (en) * | 2016-09-30 | 2017-01-04 | 广东美的制冷设备有限公司 | Energy-saving control method, controller and air-conditioning |
| CN106357178A (en) * | 2016-09-30 | 2017-01-25 | 中车株洲电力机车研究所有限公司 | Method for optimum controlling for electric transmission system of low-speed direct-drive wind turbine generator |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109510563A (en) * | 2018-11-08 | 2019-03-22 | 珠海格力电器股份有限公司 | Control method and system for suppressing motor current harmonic and storage medium |
| CN114094904A (en) * | 2021-11-09 | 2022-02-25 | 一汽解放汽车有限公司 | Carrier frequency scheduling method, carrier frequency scheduling device, computer equipment and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108696224B (en) | 2020-06-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7193387B1 (en) | System and method for motor speed estimation using hybrid model reference adaptive system | |
| US8228013B2 (en) | Method and apparatus for automatically identifying electrical parameters in a sensor-less PMSM | |
| EP2453248B1 (en) | Method and arrangement for determining inductances of synchronous reluctance machine | |
| JP5055896B2 (en) | PM motor magnetic pole position estimation method | |
| CN106992731B (en) | A kind of method and device of the position of determining rotor | |
| CN110492798B (en) | Self-adaptive zero crossing point detection method of brushless direct current motor | |
| CN106301100B (en) | A kind of automatic calibration method of permanent magnet synchronous motor, system and controller | |
| CN101485078A (en) | Sensorless technology, estimation of sampled back emf voltage values and/or the sampled inductance values based on the pulse width modulation periods | |
| WO2006050344A2 (en) | Motor control system for establishing characteristic parameters | |
| CN105449639B (en) | Voltage protection control method and device based on permanent magnet synchronous motor driver | |
| CN106533282B (en) | The blower of air-conditioner outdoor unit starts control method and device | |
| GB2520538A (en) | Phase current regulation in BLDC motors | |
| CN107659231B (en) | A kind of ultrahigh speed permanent magnet synchronous motor method for controlling number of revolution | |
| CN105553373A (en) | Permanent magnet synchronous motor control method and device | |
| CN108696224A (en) | The method and apparatus for reducing the loss of electric machine | |
| KR101601964B1 (en) | Device and method for controlling permanent magnet motor | |
| CN112737462B (en) | Method and device for identifying initial state of permanent magnet synchronous motor | |
| CN108075707B (en) | Asynchronous motor restarting method and system based on V/f control mode | |
| CN109617468A (en) | Two Vector Modulation permasyn morot PREDICTIVE CONTROL optimization methods | |
| CN106385205B (en) | Control method and device of Hall permanent magnet synchronous motor | |
| CN108448986A (en) | Magneto current control method based on BREATHABLE BANDWIDTH type PREDICTIVE CONTROL | |
| CN116582048B (en) | Position-sensor-free control method of permanent magnet synchronous motor | |
| CN104967380B (en) | Voltage Regulator on Doubly-Salient Generator control method with interference rejection ability | |
| CN114826036B (en) | Brushless direct current motor control method capable of reducing commutation torque pulsation | |
| Hrbac et al. | Estimation of on-fly phase resistance of on 8/6 switched reluctance motor for sensorless control |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 518055 Guangdong city of Shenzhen province Nanshan District Xili Street Xueyuan Road No. 1001 Chi Yuen Building 9 layer B1 Patentee after: Shenzhen daotong intelligent Aviation Technology Co.,Ltd. Address before: 518000 Guangdong city of Shenzhen province Nanshan District Xili Street Xueyuan Road No. 1001 Chi Yuen Building 9 layer B1 Patentee before: AUTEL ROBOTICS Co.,Ltd. |