CN111463971B - Winding parameter calculation method of outer rotor motor - Google Patents
Winding parameter calculation method of outer rotor motor Download PDFInfo
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- CN111463971B CN111463971B CN202010392777.2A CN202010392777A CN111463971B CN 111463971 B CN111463971 B CN 111463971B CN 202010392777 A CN202010392777 A CN 202010392777A CN 111463971 B CN111463971 B CN 111463971B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/04—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of windings, prior to mounting into machines
- H02K15/0435—Wound windings
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Abstract
The invention relates to a winding parameter calculation method of an outer rotor motor. Comprises the following steps of 1: calculating the initial parallel circuit number/the number of turns per coil/the number of parallel windings; step 2: calculating the possible number of parallel circuits; and step 3: calculating the number of parallel circuits in each group, and the number of turns/parallel winding of the corresponding coil; and 4, step 4: screening the number of parallel circuits, the number of turns of each coil and the number of parallel windings; and 5: determining the sectional area of each turn of coil; step 6: and determining the width b of the single flat copper wire. The invention has the advantages that the insulation ratio caused by the excessive number of parallel circuits and the number of turns of each coil is small, the motor efficiency is effectively improved, meanwhile, the flat copper wire is convenient to process and wire-inserting operation, the insulation is not easy to damage, the wire doubling is simple, and the number of joints is small.
Description
Technical Field
The invention relates to the technical field of outer rotor motors, in particular to a winding parameter calculation method of an outer rotor motor.
Background
The wire gauge of the motor winding is generally divided into an enameled wire and a flat copper wire, wherein the enameled wire is mainly applied to a low-voltage random winding motor, and the flat copper wire is applied to a medium-high voltage formed coil motor. The number of parallel windings of the flat copper wire of the outer rotor permanent magnet motor and the number of the parallel windings of the flat copper wire of the outer rotor permanent magnet motor are determined mainly according to experience of designers, factors such as flat copper wire processing, wire inserting, wire doubling and skin effect are comprehensively considered to be deficient, so that the flat copper wire is difficult to process or cannot be processed, the wire inserting operation is inconvenient, insulation is easily damaged, the wire doubling is complex, the number of joints is too many, the insulation occupation ratio caused by the number of the parallel windings and the number of turns of each coil is too much, the motor efficiency is reduced, and the like.
Disclosure of Invention
The present inventors have conducted intensive studies to overcome the drawbacks of the prior art, and the present invention provides a winding parameter calculation method of an outer rotor motor. The method comprises the following steps:
step 1: a set of initial data of the winding is obtained through electromagnetic calculation according to working condition parameters such as motor voltage, power, rotating speed and torque, and the electromagnetic calculation process can refer to an example given in pages P215-233 of modern permanent magnet motor theory and design (first edition, mechanical industry Press) published in 2018, 1 month. The calculated result comprises a parallel connection number a0, N0 turns per coil and w0 turns, wherein the sectional area of each wire gauge is S0;
step 2: on the basis of the initial data, further calculating the divisor a of the pole number of the motor, wherein the divisor a is a1, a2 and a3 … …, and the divisor a is the number of parallel circuits which can be selected by the motor;
and step 3: calculating the number of turns of each coil and the number of parallel windings corresponding to each group of parallel circuits, and calculating to obtain the results of the number of parallel circuits, the number of turns of each coil and the number of parallel windings:
and 4, step 4: screening the number of parallel circuits, the number of turns of each coil and the number of parallel windings of each group of data in the step 3;
and 5: and determining the sectional area S of each coil turn according to the data set screened in the step 4, wherein the sectional area S of each coil turn is equal to the sectional area S0 of each wire gauge wound by number.
Step 6: the width and thickness of the single flat copper wire are determined by the coil distribution mode and the width of the notch.
Preferably, the result that the number of parallel circuits is less than or equal to 10 and the number of turns per coil is an integer is selected in step 4.
Preferably, the result with a number of wraps < 4 is selected in step 4.
Further, in step 4, the result with the least number of parallel paths is selected.
Preferably, in step 6, the thickness of the single flat copper wire satisfies the following requirements: the width/thickness is more than or equal to 1.5; the lower limit of the thickness is 0.8mm, the upper limit of the thickness is the skin effect depth size, and the calculation formula of the skin effect depth size is
Delta-penetration depth (m)
Omega-angular frequency, omega 2 pi f (rad/s)
Mu-magnetic permeability (H/m)
Gamma-conductivity (S/m)
On the wireWhen copper wire is used, γ is 58 × 106(S/m) in the formula for calculating the skin effect depth dimension, μ ═ 4 π × 10-7H/m。
And 7: and (4) checking the tank fullness rate, preferably selecting the result of which the tank fullness rate is more than or equal to 85% and less than or equal to 90%.
The invention has the following technical effects: the winding designed by the winding parameter calculation method of the outer rotor motor has the advantages that the number of parallel circuits and the number of turns of each coil are too large, so that the insulation ratio is less, the motor efficiency is effectively improved, meanwhile, the processing and wire embedding operation of the flat copper wire are convenient, the insulation is not easy to damage, the parallel connection is simple, and the number of joints is small.
Drawings
Fig. 1 is a flow chart of a winding parameter calculation method of an outer rotor motor according to the present invention.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As shown in fig. 1, the present invention provides a winding parameter calculation method of an outer rotor motor. The method comprises the following steps:
step 1: according to working condition parameters such as motor voltage, power, rotating speed, torque and the like, a group of initial data of the winding is obtained through electromagnetic calculation, and the initial data comprises a parallel circuit number a0, the number of turns N0 of each coil and the number of wound turns w0, wherein the sectional area S0 of each wire gauge;
step 2: calculating the divisor a of the pole number of the motor, wherein the divisor a is a1, a2 and a3 … …, and the divisor a is the number of parallel circuits which can be selected by the motor;
and step 3: calculating the number of turns of each coil and the number of parallel windings corresponding to each group of parallel circuits, and calculating to obtain the results of the number of parallel circuits, the number of turns of each coil and the number of parallel windings:
| number of parallel paths | a0 | a1 | a2 | …… | an |
| Number of turns per coil | N0 | N0*(a1/a0) | N0*(a2/a0) | …… | N0*(an/a0) |
| Number of parallel winding | w0 | w0/(a1/a0) | w0/(a2/a0) | …… | w0*(an/a0) |
And 4, step 4: screening the number of parallel circuits, the number of turns of each coil and the number of parallel windings of each group of data in the step 3;
and 5: and determining the sectional area S of each coil turn according to the data set screened in the step 4, wherein the sectional area S of each coil turn is equal to the sectional area S0 of each wire gauge wound by number.
Step 6: the width and thickness of the single flat copper wire are determined by the coil distribution mode and the width of the notch.
Preferably, the number of parallel paths is less than or equal to 10 in step 4, because the number of parallel paths is usually too large, which results in complicated wiring, too many joints and too large cross-sectional area of the connecting wires. The number of turns per coil is an integer. Non-integral coil turns are inconvenient to process and are inconvenient to embed and wire. If the number of turns of the coil is calculated to be a non-integer through the formula, rounding is carried out, and then correction is carried out by adjusting other electromagnetic parameters.
Preferably, the result with a number of wraps < 4 is selected in step 4. Too many parallel windings make the subsequent parallel welding operation difficult. For example, when the number of parallel winding is 1 and 5, the number of parallel welding is 2 and 10. It is clear that the difficulty of welding 10 pieces at a time is much greater than the difficulty of welding 2 pieces at a time.
Further, if there are more data groups to be selected under the condition of satisfying the screening result in step 4, it is preferable to select a data group with a smaller number of parallel paths, and it is preferable to select a result with the smallest number of parallel paths.
Preferably, in step 6, the thickness of the single flat copper wire satisfies the following requirements: the width/thickness is more than or equal to 1.5; the lower limit of the thickness is 0.8mm, the upper limit of the thickness is the skin effect depth size, and the calculation formula of the skin effect depth size is
Delta-penetration depth (m)
Omega-angular frequency, omega 2 pi f (rad/s)
Mu-magnetic permeability (H/m)
Gamma-conductivity (S/m)
When the conducting wire adopts a copper wire, gamma is 58 multiplied by 106(S/m) in the formula for calculating the skin effect depth dimension, μ ═ 4 π × 10-7H/m。
And 7: and (4) checking the full rate of the slot, preferably selecting the result of which the full rate is more than or equal to 85% and less than or equal to 90%, wherein the full rate condition of the slot is favorable for improving the efficiency of the motor.
For example, the number of poles of a flat copper wire motor is 12, and the frequency is 20 Hz. The method according to the invention confirms a set of parameters as follows:
the electromagnetic calculation in the step 1 preliminarily confirms that one group of the coils has 4 parallel circuits/10 turns per coil/5 parallel coils/6 wire gauge sectional area, the distribution mode of the coils is divided into an upper layer and a lower layer, and the width of a notch is 8mm
Step 2: calculating the submultiple of the pole number, namely the submultiple of 12, wherein the number of the possible parallel circuits of the motor is 1,2,3,4,6 and 12;
and step 3: and calculating the number of turns and the number of parallel windings of each coil corresponding to each group of parallel circuits according to the number of the parallel circuits of each group, wherein the calculation process is as follows:
| number of parallel paths | 2 | 1 | 2 | 3 | 4 | 6 | 12 |
| Number of turns per coil | 10 | 5 | 10 | 15 | 20 | 30 | 60 |
| Number of parallel winding | 6 | 12 | 6 | 4 | 3 | 2 | 1 |
And 4, step 4: screening was carried out under the following conditions
Step 4.1, the number of the parallel paths is less than or equal to 10, and data with the number of the last group of parallel paths being 12 are excluded;
4.2, the number of turns of each coil is an integer, and the data are integers which meet the requirements without correction;
4.3, the number of parallel winding is less than or equal to 4, and data with the number of parallel connection of 1 and 2 is excluded;
4.4, rechecking the number of the parallel paths, and also three groups of data with the number of the three groups of parallel paths being 3,4 and 6 to meet the requirements, wherein the data group with the number of the parallel paths being 3 is finally selected according to the principle that the smaller number of the parallel paths is suitable to be selected;
and 5, calculating the sectional area S of each turn of coil to be 4-6-24. The skin effect depth delta of the motor is calculated to be 14.78mm, namely the size of the upper limit value of the thickness of the flat copper wire cannot exceed the value, the selection range is 0.8-5.6 when the lower limit value is combined to be 0.8mm, the width/length is larger than or equal to 1.5, finally the sectional area 24 of each turn of coil is combined, the thickness of the flat copper wire is selected to be 3.7, and the number of the parallel winding is 1, so that the motor is reasonable.
And 6, determining the width of the single flat copper wire to be 6.5mm according to the distribution mode of the coils and the width of the notch.
And finally, accounting the full rate of the tank to be between 85 and 90 percent, and meeting the condition.
While embodiments of the present invention have been described above, the present invention is not limited to the specific embodiments and applications described above, which are intended to be illustrative, instructive, and not limiting. Those skilled in the art, having the benefit of this disclosure, may effect numerous modifications thereto without departing from the scope of the invention as defined by the appended claims.
Claims (3)
1. A winding parameter calculation method of an outer rotor motor is characterized by comprising the following steps:
step 1: according to working condition parameters such as motor voltage, power, rotating speed, torque and the like, a group of initial data of the winding is obtained through electromagnetic calculation, and the initial data comprises a parallel circuit number a0, the number of turns N0 of each coil and the number of wound turns w0, wherein the sectional area S0 of each wire gauge;
step 2: calculating the submultiples a, a = a1, a2 and a3 … … of the pole number of the motor, wherein the submultiple a is the number of parallel circuits which can be selected by the motor;
and step 3: calculating the number of turns of each coil and the number of parallel windings corresponding to each group of parallel circuits, and calculating to obtain the results of the number of parallel circuits, the number of turns of each coil and the number of parallel windings:
and 4, step 4: screening the number of parallel circuits, the number of turns of each coil and the number of parallel windings of each group of data in the step 3, selecting a result which simultaneously satisfies that the number of parallel circuits is less than or equal to 10, the number of turns of each coil is an integer and the number of parallel windings is less than or equal to 4, and further selecting a result with the minimum number of parallel circuits under the condition of satisfying the result;
and 5: determining the sectional area S of each coil turn according to the data set screened in the step 4, wherein the sectional area S of each coil turn = the number of wound turns × the sectional area S0 of each wire gauge;
step 6: determining the width and thickness of a single flat copper wire according to the coil distribution mode and the width of the notch;
and 7: and (4) checking the tank fullness rate, and selecting a result with the tank fullness rate being more than or equal to 85% and less than or equal to 90%.
2. The winding parameter calculation method of the external rotor electric machine according to claim 1, wherein the thickness dimension of the single flat copper wire in step 6 satisfies: the width/thickness is more than or equal to 1.5; the lower limit of the thickness is 0.8mm, the upper limit of the thickness is the skin effect depth size, and the calculation formula of the skin effect depth size is
Δ — penetration depth (m);
ω -angular frequency, ω =2 π f (rad/s), f is frequency in Hertz;
μ -permeability (H/m);
γ -conductivity (S/m).
3. The winding parameter calculation method of an external rotor electric machine according to claim 2, wherein the skin effect depth dimension is calculated in the formula
H/m。
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| CN101364751B (en) * | 2007-12-21 | 2011-01-26 | 清华大学 | Method for modifying double layer winded performing winding into Y-Delta mixed performed winding |
| CN102035318A (en) * | 2010-12-31 | 2011-04-27 | 兰州兰电电机有限公司 | Method for manufacturing embedded rotor winding |
| WO2018035775A1 (en) * | 2016-08-24 | 2018-03-01 | 廖建航 | Horizontal winding machine current calculation method and system |
| JP2019037075A (en) * | 2017-08-17 | 2019-03-07 | 住友電気工業株式会社 | Coil design method |
| US20190372437A1 (en) * | 2018-05-31 | 2019-12-05 | Siemens Energy, Inc. | Method for restoring separation between laminations of generator stator core |
| CN109921578A (en) * | 2019-03-19 | 2019-06-21 | 上海电气风电集团有限公司 | Manufacturing method, rotor and the motor of rotor |
| CN110212710B (en) * | 2019-06-17 | 2020-05-08 | 北京理工大学 | Design method of permanent magnet synchronous motor for vehicle |
| CN110896265B (en) * | 2019-08-20 | 2021-04-27 | 湖南科技大学 | Stator duplex winding equivalent air gap modeling method in switched reluctance motor temperature field analysis |
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