CN110492643B - Generator motor suitable for seawater pumped storage power station - Google Patents
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- CN110492643B CN110492643B CN201910533003.4A CN201910533003A CN110492643B CN 110492643 B CN110492643 B CN 110492643B CN 201910533003 A CN201910533003 A CN 201910533003A CN 110492643 B CN110492643 B CN 110492643B
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- 238000003860 storage Methods 0.000 title claims abstract description 16
- 239000013535 sea water Substances 0.000 title claims abstract description 14
- 238000004804 winding Methods 0.000 claims abstract description 107
- 238000010248 power generation Methods 0.000 claims abstract description 9
- 230000004907 flux Effects 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 230000035699 permeability Effects 0.000 claims description 3
- 230000003313 weakening effect Effects 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- 230000001360 synchronised effect Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000011960 computer-aided design Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
- H02K1/246—Variable reluctance rotors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/18—Windings for salient poles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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Abstract
The invention provides a generator motor suitable for a seawater pumped storage power station, which comprises a stator and a rotor, and is characterized in that the stator of the generator motor is provided with two independent windings, namely a stator power winding and a stator control winding, wherein the stator power winding is used as an electric port for direct power generation, and the stator control winding is used as an electric port connected with a converter; the rotor simultaneously couples two magnetic fields of a stator power winding and a stator control winding on the stator. The invention aims at overcoming the defects of the prior art and provides a generator motor suitable for a seawater pumped storage power station.
Description
Technical Field
The invention relates to the technical field of seawater pumped storage power stations, in particular to a generator motor suitable for a seawater pumped storage power station.
Background
With the increasing availability of renewable energy, the stability of electrical power systems becomes an important issue. Devices for improving the stability of the power grid, such as variable-speed pumped-storage systems, are becoming more and more attractive due to their fast rotational speed response and flexible regulation.
There are two kinds of variable speed pumped storage units with relatively great attention, one is synchronous generator unit with SFC and the other is double-fed unit with only slip power converter and brush and slip ring. However, both of the above have significant drawbacks.
The synchronous generator set configured with the full-power converter SFC is not different from the traditional synchronous generator set in principle, and only the full-power converter is additionally arranged at the stator power generation outlet in order to meet the purpose of variable-speed constant-frequency constant-voltage power generation. In such systems, the capacity of the full power converter must be consistent with the unit, which results in a doubling of the cost of the overall system, which is the most significant disadvantage.
The rotor components of the brush and slip ring doubly-fed variable speed unit employed are difficult to manufacture and maintain. The doubly-fed motor with the electric brush and the slip ring can operate in a doubly-fed state, and although the capacity of the frequency converter is reduced, the existence of the electric brush can not enable the motor to operate in a working environment with relatively bad conditions, frequent maintenance is required, and therefore the cost is increased; in addition, compared with an integrally-formed structure, the manufacturing process greatly increases the labor manufacturing cost and the error making probability required by the wound rotor structure.
Meanwhile, the common water head of the seawater pumped storage power station is lower, the rotating speed of the water turbine is correspondingly slower, and the working condition is suitable for a synchronous rotating speed rotary small generator motor. For multipolar logarithmic requirement caused by low synchronous rotation speed, higher manufacturing cost and technological requirement of a winding structure rotor of the current double-fed variable speed unit are probably caused.
Aiming at a seawater pumped storage power station, a high-reliability rotor component is needed to be maintenance-free at present, and a generator motor with adjustable rotating speed, active/nonfunctional decoupling control and low water head suitability is also needed.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art and provides a generator motor suitable for a seawater pumped storage power station.
The invention provides a generator motor suitable for a seawater pumped storage power station, which comprises a stator and a rotor, and is characterized in that the stator of the generator motor is provided with two independent windings, namely a stator power winding and a stator control winding, wherein the stator power winding is used as an electric port for direct power generation, and the stator control winding is used as an electric port connected with a converter; the rotor simultaneously couples two magnetic fields of a stator power winding and a stator control winding on the stator.
In the above technical scheme, the generator motor has two air gaps, and the stator power winding and the stator control winding have power flow.
In the technical scheme, when the generator motor is in the grid-connected operation mode, the air-gap fundamental wave rotating magnetic fields generated by the stator power winding and the stator control winding interact under the action of the rotating rotor, and the frequency of induction currents respectively generated by the air-gap fundamental wave rotating magnetic fields generated by the stator power winding and the stator control winding in the rotor is equal.
In the above technical scheme, the stator power winding and the stator control winding and the rotor satisfy the following formulas:
wherein s is 1 Sum s 2 Slip, ω, of the stator power winding and the stator control winding, respectively 1 And omega 2 The electrical angular velocity of the stator power winding rotating magnetic field and the electrical angular velocity of the stator control winding rotating magnetic field are respectively f 1 And f 2 The frequencies of the excitation currents of the stator power windings and the stator control windings, respectively.
In the above technical scheme, the rotor rotation speed formula of the reluctance type generator motor:
wherein p is r Representing the number of salient poles, ω, of salient pole reluctance rotor r Is the rotation angular velocity of the rotor
In the technical proposal, the constraint condition of the number of the salient poles of the rotor in the reluctance type generator motor is that,
p r ＝p 1 ±p 2
wherein p is 1 For pole pair number, p, of stator power winding 2 Controlling a winding pole pair rotor for the stator; the constraint on the number of salient poles also includes p r >0。
In the above technical solution, for a reluctance rotor structure with unequal tooth widths, the geometric dimensions thereof are symmetrical on the circumference of the air gap, assuming that the maximum air gap length and the minimum air gap length are d respectively max And d min The air gap magnetic guided wave can be expressed as:
wherein beta is i Representing the ratio of the tooth width of each tooth, wherein beta is more than or equal to 0 i Is less than or equal to 1; j represents the number of teeth under each salient pole, and the number of teeth under each salient pole can be generally 2-5 because the selection of j must consider that the fine teeth can not affect the main magnetic circuit of the motor, the fine teeth have enough mechanical strength and meet the requirements of the motor manufacturing process.
The stator power winding is an electric port for direct power generation, the stator control winding is an electric port connected with a current transformer, and the design of the rotor of the generator motor adopts an optimization method of a magnetic field modulation type unequal-tooth-width reluctance rotor, so that the rotor has double-coupling working capacity of efficiently coupling two magnetic fields at the same time. There are two air gaps in the generator motor where power flows in both the stator power windings and the control windings. The generator can operate at the super-synchronous rotating speed or the subsynchronous rotating speed under the power generation working condition or the water pumping working condition. The generator motor introduced by the invention can meet the requirements of the seawater pumped storage power station on variable speed constant frequency constant voltage power generation, multipolar logarithm and low synchronous rotation speed of the generator motor, and has the characteristics of active/reactive decoupling control, high reliability, maintenance-free rotor parts, low control system cost and the like.
Drawings
FIG. 1 is a schematic diagram of the operation of a system of electric generator motors of the present invention adapted for use in a seawater pumped storage power station;
FIG. 2 is a schematic diagram of the energy flow of the super-synchronous speed operation of the generator motor of the present invention under generating conditions;
FIG. 3 is a schematic diagram of the energy flow of a sub-synchronous speed operation of the generator motor of the present invention under generator conditions;
FIG. 4 is a schematic diagram of the energy flow of the super-synchronous speed operation of the generator motor of the present invention under pumping conditions;
FIG. 5 is a schematic diagram of the energy flow of a sub-synchronous speed operation of the generator motor of the present invention under generator conditions;
FIG. 6 is a schematic diagram of two magnetic fields of a generator motor of the present invention (power winding pole pair number 1, control winding pole pair number 3);
FIG. 7 is a schematic view of the rotating magnetic fields in the generator motor of the present invention;
FIG. 8 is a plan expanded view and analytical model of a conventional salient-pole reluctance rotor;
FIG. 9 is an analytical model of an unequal tooth width reluctance rotor of a generator motor of the present invention;
FIG. 10 is a waveform diagram of the air gap magnetic density of the generator motor of the present invention;
FIG. 11 is a graph showing the results of an analysis of air gap flux density harmonics of a generator motor according to the present invention;
FIG. 12 is a plan view of an unequal tooth width reluctance rotor of the generator motor of the present invention.
Detailed Description
The invention will now be described in further detail with reference to the drawings and specific examples, which are given for clarity of understanding and are not to be construed as limiting the invention.
As shown in fig. 1-5, the invention provides a generator motor suitable for a seawater pumped storage power station, which comprises a stator and a rotor, and is characterized in that the stator of the generator motor is provided with two independent windings, namely a stator power winding and a stator control winding, wherein the stator power winding is used as an electric port for direct power generation, and the stator control winding is used as an electric port connected with a converter; the rotor simultaneously couples two magnetic fields of a stator power winding and a stator control winding on the stator. There are two air gaps in the generator motor where there is power flow in both the stator power windings and the stator control windings.
The stator of such a generator motor has two separate sets of windings with different pole pairs to avoid direct coupling between the two sets of windings of the stator, as shown in fig. 6. The first set of windings is directly connected with the power grid or electric equipment, and the pole pair number of the first set of windings is p 1 The method comprises the steps of carrying out a first treatment on the surface of the The second winding is generally connected to a voltage-and frequency-adjustable current transformer having a pole pair number p 2 . Meanwhile, the rotor of the generator motor is specially designed to couple the two sets of windings on the stator.
In the grid-connected operation mode, the pole pair number of the generator motor is p 1 Is directly formed from the stator winding of the angular frequency omega as a power winding 1 The AC power supply of the motor is that the air gap magnetic field generated by the power winding has the rotating speed of omega 1 /p 1 The method comprises the steps of carrying out a first treatment on the surface of the P pole pair number 2 Is used as a control winding and has an input or output angular frequency omega 2 The rotating speed of the air gap magnetic field generated by the control winding is omega 2 /p 2 . The two sets of stator windings realize energy transfer through indirect coupling of the rotor, and the rotor plays a role similar to a converter between different pole pairs of the stator. The magnetic densities of the power winding and the control winding can be expressed as,
b 1 (θ,t)＝B 1 cos[ω 1 t-p 1 θ](1)
b 2 (θ,t)＝B 2 cos[ω 2 t-p 2 θ](2)
Wherein B is 1 And B 2 Is the peak value of two magnetic densities, theta is the position angle on the circumference of the air gap, omega 1 And omega 2 The electrical angular velocity of the power winding rotating magnetic field and the electrical angular velocity of the control winding rotating magnetic field are respectively.
Positioning equations 1 and 2 on the rotor reference frame, the rotational angular velocity of the rotor may be defined as,
ω r = (θ' - θ)/t (3)
Where θ' is the position angle of the rotor reference frame on the circumference of the air gap. The two air gap field densities at the rotor reference frame may be expressed as,
b 1 ′(θ′,t)＝B 1 cos[(ω 1 -p 1 ω r )t-p 1 θ′](4)
b 2 ′(θ′,t)＝B 2 cos[(ω 2 -p 2 ω r )t-p 2 θ′](5)
In order to enable two sets of stator windings to be indirectly coupled through the rotor, the air gap fundamental wave rotating magnetic fields generated by the power winding and the control winding interact under the action of the rotating rotor, so that the two sets of stator windings which are not directly coupled can transmit energy through the rotor, and the frequency of induction currents respectively generated in the rotor by the air gap fundamental wave rotating magnetic fields generated by the power winding and the control winding is required to be equal, namely,
|ω 1 -p 1 ω r |＝|ω 2 -p 2 ω r i (6)
According to equation 6, the rotor rotational mechanical angular velocity is obtained as:
the angular velocity of the two rotating magnetic fields can be expressed as,
ω 1 ＝2πf 1 (8)
ω 2 ＝2πf 2 (9)
f 1 And f 2 The frequencies of exciting currents of two sets of windings of the stator are respectively. According to the rotation speed of the rotating magnetic field, the slip ratio s of two sets of windings on the stator can be known 1 Sum s 2 The two kinds of the materials are respectively that,
formulas are represented in boxes "; the electric angular velocity of the rotating magnetic field of the power winding and the control winding is converted into the rotor coordinate system, and the angular velocity omega of the magnetic field of the power winding on the rotor reference system can be obtained 1r And controlling the angular velocity omega of the winding magnetic field in the rotor reference frame 2r The two kinds of the materials are respectively that,
ω r1 ＝ω 1 -p 1 ω r (12)
ω r2 ＝ω 2 -p 2 ω r (13)
When "+" is taken in equation 7, ω 1 -p 1 ω r ＝p 2 ω r -ω 2 The product is obtained by the method,
ω r1 ＝-ω r2 (14)
From equations 10, 11 and 14,
a schematic diagram of the magnetic fields in this synchronous mode of operation of the generator motor is shown in fig. 7. When stator power windings and controls are respectively energized with three-phase symmetrical voltages, two fundamental magnetic fields exist simultaneously in the generator motor, which requires the rotor to be decoupled simultaneously from p 1 And p 2 The two different pole pair numbers of fundamental magnetic fields. Meanwhile, other harmonic components generated by the rotor need to be controlled to be smaller and better. This is because the other order harmonic components do not generate induced potentials in the stator windings, and the effects of these harmonic components are considered as harmonic reactance from the standpoint of operation of such a generator motor. The above needs are met by an unequal tooth width reluctance rotor design, as will be described in greater detail below.
As described above, it is assumed that the frequencies of the three-phase symmetric excitation currents of the two sets of windings of the stator are ω 1 And omega 2 Then the motorThe two resultant magnetomotive forces in the air gap can be expressed as,
wherein I is 1 And I 2 The amplitude values of exciting currents of two windings of the stator are respectively n 1 And n 2 Each phase turns of two sets of windings of the stator respectively, theta is the mechanical angle of the circumference of the air gap, and alpha is the initial position difference of two composite magnetomotive forces. If the average length of the motor air gap is m, the maximum and minimum air gap lengths are (m+n) and (m-n), respectively, and the air permeability coefficient in the air gap is μ 0 The magnetic conductance waveform of the salient pole reluctance rotor after the air gap is transformed can be expressed as,
g -1 (θ,t)＝m+ncos[p r (θ-ω r t)](18)
Wherein p is r Representing the number of salient poles, ω, of salient pole reluctance rotor r Is the rotational angular velocity of the rotor.
The magnetic permeability wave shape after the salient pole rotor is transformed modulates the two synthetic magnetomotive forces, and the magnetic density wave formed after modulation can be respectively expressed as,
B 1 (θ,t)＝μ 0 g -1 (θ)F 1 (θ) (19)
B 2 (θ,t)＝μ 0 g -1 (θ)F 2 (θ) (20)
Substituting equations 16 and 18 into equation 19 can form p after modulation 1 The magnetic compact wave corresponding to the pole pair number is rewritten as,
substituting the formula 17 and the formula 18 into the formula 19 can form p after modulation 2 Polar logarithmThe corresponding magneto-optical density wave is rewritten as,
from equations 21 and 22, it can be seen that the special guided magnetic wave modulates the spatially-synthesized magnetomotive force, which is originally sinusoidal, into a multi-frequency air-gap flux density, and the modulated guided magnetic wave is a function of not only time but also spatial position angle.
For the two magnetic waves obtained after modulation, in order to achieve the indirect coupling effect of the two sets of stator windings in the generator motor, equations 21 and 22 should have a time function of the same frequency and a space function of the same frequency, that is,
(ω 1 -p r ω r )t＝±ω 2 t (23)
(p 1 -p r )θ＝±p 2 θ (24)
The rotor speed formula of the reluctance generator motor is derived from formula 23,
the constraint on the number of rotor salient poles in the reluctance motor according to equation 24 is that,
p r ＝p 1 ±p 2 (26)
Of course, the constraint condition of the number of rotor salient poles also comprises p r >0。
The principle of magnetic field modulation of the magnetic guided wave on the magnetomotive wave is the basic principle of a common salient pole reluctance rotor generator motor, and is also the basis for analyzing the reluctance rotors with unequal tooth widths. In order to more intuitively analyze and calculate the magnetic guided waves generated by the reluctance rotors with unequal tooth widths and the air gap flux density modulated by the magnetic guided waves, the performance of the generator motor is further improved, the magnetic resistance and the air gap flux density are required to be expressed in a functional mode, and then computer aided design is performed by programming a calculation program.
For a reluctance rotor structure of equal tooth width, the geometry of which is symmetrical about the circumference of the air gap, it is assumed that the maximum and minimum air gap lengths are d, respectively max And d min As shown in fig. 8, the air gap magnetic guided wave can be expressed as,
wherein, beta represents the tooth width proportion, and beta is more than or equal to 0 and less than or equal to 1; pr is the number of magnetic poles of the rotor.
Similarly, the flux guide expression for the case of unequal tooth widths can be derived from equation 23. For a reluctance rotor structure with unequal tooth widths, the geometry is symmetrical about the circumference of the air gap, assuming a maximum and minimum air gap length d, respectively max And d min As shown in fig. 9, the air gap magnetic guided wave can be represented as,
wherein beta is i Representing the ratio of the tooth width of each tooth, wherein beta is more than or equal to 0 i Is less than or equal to 1; j represents the number of teeth under each salient pole, and of course, the selection of j must consider that the fine teeth do not affect the main magnetic circuit of the motor, and the fine teeth have enough mechanical strength and meet the requirements of the motor manufacturing process, so the number of teeth under each salient pole can be generally 2-5.
Assuming that the pole pair number of the power winding and the pole pair number of the control winding of the generator motor are p 1 =2 and p 2 =4, taking the positive sign according to equation 26, i.e. taking the effect of the superposition of two magnetic fields, the salient pole number p of the reluctance rotor can be known r =6. FIG. 10 is a schematic plan view of an unequal tooth width reluctance rotor; wherein, the tooth width ratio of the common salient pole is 0.5, and each salient pole with unequal tooth width magnetic resistance is divided into three sections which are bilaterally symmetrical, and the tooth width ratio is 0.9 and 0.3 respectively.
If the ratio of the three-phase symmetrical exciting current amplitude values of two sets of windings of the stator is k, andthe two sets of windings have the same number of turns, i.e. n 1 ＝n 2 When n, the initial phase angle difference of the exciting current is alpha, the two composite magnetomotive forces in the motor air gap can be expressed as,
the function of the air gap flux density of the motor can be expressed as,
from equation 26, the air gap flux density is a function of θ, which determines the harmonic content of the magnetic reluctance along the circumference of the air gap that will affect the air gap flux density. When k=0.5, α=2pi/3, fig. 11 and fig. 12 show waveforms of air gap flux density after the unequal tooth width reluctance modulation and magnetic field harmonic analysis results of the air gap flux density, respectively. It can be found that after the magnetic resistance modulation with unequal tooth widths, p in the air gap flux density 1 =2 and p 2 The magnetic density content of the working magnetic field with the number of 4 pole pairs accounts for the main component, and the harmonic content of other orders is smaller, so that the design effect of weakening the magnetic density harmonic content through unequal tooth widths is achieved.
What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (1)
1. The generator motor suitable for the seawater pumped storage power station comprises a stator and a rotor, and is characterized in that the stator of the generator motor is provided with two independent windings, namely a stator power winding and a stator control winding, wherein the stator power winding is used as an electric port for direct power generation, and the stator control winding is used as an electric port connected with a converter; the rotor is simultaneously coupled with two magnetic fields of a stator power winding and a stator control winding on the stator; the generator motor is provided with two air gaps, and power flows are arranged in the stator power winding and the stator control winding;
when the generator motor is in a grid-connected operation mode, the air-gap fundamental wave rotating magnetic fields generated by the stator power winding and the stator control winding interact under the action of the rotating rotor, and the frequency of induction currents respectively generated by the air-gap fundamental wave rotating magnetic fields generated by the stator power winding and the stator control winding in the rotor is equal;
the stator power windings and stator control windings and the rotor satisfy the following formulas:
wherein s is 1 Sum s 2 Slip, ω, of the stator power winding and the stator control winding, respectively 1 And omega 2 The electrical angular velocity of the stator power winding rotating magnetic field and the electrical angular velocity of the stator control winding rotating magnetic field are respectively f 1 And f 2 The frequencies of exciting currents of the stator power winding and the stator control winding are respectively;
the rotor speed formula of the generator motor:
wherein p is r Representing the number of salient poles, ω, of salient pole reluctance rotor r The rotational angular velocity of the rotor;
the constraint condition of the number of rotor salient poles in the reluctance motor is that,
p r ＝p 1 ±p 2
wherein p is 1 For pole pair number, p, of stator power winding 2 Controlling a winding pole pair rotor for the stator; the constraint on the number of salient poles also includes p r >0；
The rotor of the generator motor is of a reluctance rotor structure with unequal tooth widths, the geometric dimensions of the reluctance rotor structure are symmetrical on the circumference of the air gap, and the maximum air gap length and the minimum air gap length are respectively d max And d min The air gap magnetic guided wave is expressed as:
wherein beta is i Representing the ratio of the tooth width of each tooth, wherein beta is more than or equal to 0 i Is less than or equal to 1; j represents the number of teeth under each salient pole, and the selection of j is to consider that the fine teeth do not influence the main magnetic circuit of the motor, have enough mechanical strength and meet the requirements of the motor manufacturing process, and the number of the teeth under each salient pole is 2-5; θ is the position angle on the air gap circumference; mu (mu) 0 Is the air permeability coefficient in the air gap;
the function of the air gap flux density of the motor is expressed as
The air gap flux density is the harmonic content of the magnetic resistance along the circumference of the air gap as a function of θ that will affect the air gap flux density; when k=0.5 and alpha=2pi/3, after the magnetic resistance modulation with unequal tooth widths, p in the air gap flux density 1 =2 and p 2 The magnetic density content of the working magnetic field with the number of 4 pole pairs accounts for the main component, and the harmonic content of other orders is smaller, so that the design effect of weakening the magnetic density harmonic content through unequal tooth widths is achieved.
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| CN101621276A (en) * | 2008-07-01 | 2010-01-06 | 沈阳工业大学 | High-power brushless double-fed motor variable frequency speed control system and starting method thereof |
| CN106787545A (en) * | 2017-01-05 | 2017-05-31 | 东南大学 | A kind of double-stator magneto resistance brushless wind generator of three electrical ports |
| CN210074914U (en) * | 2019-06-19 | 2020-02-14 | 长江勘测规划设计研究有限责任公司 | Generator motor suitable for seawater pumped storage power station |
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