CN117353498A - Motor winding, motor and compressor - Google Patents
Motor winding, motor and compressor Download PDFInfo
- Publication number
- CN117353498A CN117353498A CN202210747879.0A CN202210747879A CN117353498A CN 117353498 A CN117353498 A CN 117353498A CN 202210747879 A CN202210747879 A CN 202210747879A CN 117353498 A CN117353498 A CN 117353498A
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- China
- Prior art keywords
- motor
- coil group
- coil
- control element
- winding
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- Pending
Links
- 238000004804 winding Methods 0.000 title claims abstract description 90
- 230000007935 neutral effect Effects 0.000 claims description 8
- 238000010248 power generation Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 238000013329 compounding Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- H02K3/28—Layout of windings or of connections between windings
-
- 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
- H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
- H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays
- H02P25/188—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays wherein the motor windings are switched from series to parallel or vice versa to control speed or torque
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Windings For Motors And Generators (AREA)
Abstract
The invention provides a motor winding, a motor and a compressor. The motor winding comprises three-phase windings, each phase winding at least comprises a first coil group and a second coil group, each coil group comprises at least two groups of sub-coils connected, and when the motor is in a first running state, the first coil group and the second coil group are connected in parallel through a control element; when the motor is in the second operating state, the first coil group and the second coil group are connected in series through a control element. The invention changes the generating voltage of the motor by controlling the series connection and parallel connection relation of the coil groups in each phase of winding, widens the running range of the motor and improves the working efficiency of the motor.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a motor winding, a motor and a compressor.
Background
The variable frequency motor is used in the conventional compressor, the power generation voltage is in direct proportion to the number of turns of a motor winding, and once the motor winding is shaped and assembled into a whole machine, the motor winding is quantitative and cannot be switched and changed. The motor for the compressor in the traditional form cannot be fully suitable for a wider working condition range, and cannot exert the efficiency under a specific working condition. If the power generation voltage of the designed motor is higher, the motor can have better performance at low speed, but the running voltage is too high, so that the motor can enter a weak magnetic state earlier, and the motor efficiency is influenced. If the power generation voltage of the designed motor is lower, the motor does not enter a weak magnetic state later or does not enter the weak magnetic state, but the utilization rate of the flux linkage is insufficient in a low-speed state, so that the motor efficiency is affected.
The traditional star-delta switching mode or winding cutting mode is used, and the star-delta mode has larger impact on a motor and has the problem of circulation; the winding cutting mode switches a group of coils under certain working conditions, and although the aim of speed regulation can be achieved, the blank value of the group of coils wastes materials and has no obvious advantage in motor efficiency.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a motor winding, a motor and a compressor, wherein the generating voltage of the motor is adjusted by switching the coil groups of each phase of winding in series and in parallel, so that the working range of the motor is widened, and the working efficiency of the motor is improved.
An embodiment of the present invention provides a motor winding, including: each phase of winding at least comprises a first coil group and a second coil group, each coil group comprises at least two groups of sub-coils connected with each other, and when the motor is in a first running state, the first coil group and the second coil group are connected in parallel through a control element; when the motor is in the second operating state, the first coil group and the second coil group are connected in series through a control element.
In some embodiments, the first ends of the sub-coils of the first coil set are connected and form a first end of the first coil set, the lead-out wires of the first end of the first coil set are connected to a power source, the second ends of the sub-coils of the second coil set are connected and form a second end of the second coil set, and the lead-out wires of the second end of the second coil set are connected to a neutral point formed by the three-phase winding.
In some embodiments, the control element comprises a first control element and a second control element, the first control element being disposed on the second end of the first coil set, the second control element being disposed on the first end of the second coil set.
In some embodiments, when the motor is in the first operating state, the second ends of the sub-coils of the first coil group are connected and form the second ends of the first coil group, the lead wires of the second ends of the first coil group are connected to the neutral point through the first control element, the first ends of the sub-coils of the second coil group are connected and form the first ends of the second coil group, and the lead wires of the first ends of the second coil group are connected to the power supply through the second control element.
In some embodiments, when the motor is in the second operating state, the second end of the first coil set and the first end of the second coil set are electrically connected to the first end of the second coil set through the first control element and the second control element, respectively.
In some embodiments, the control element is a switch.
In some embodiments, the number of sub-coils of the coil groups of each phase winding is the same.
The embodiment of the invention provides a motor, which comprises the motor winding.
In some embodiments, the motor further comprises a stator, wherein the stator comprises a stator core, and three-phase windings are respectively wound in stator slots of the stator core; each stator slot at least comprises a sub-coil of a first coil group and a sub-coil of a second coil group of the single-phase winding.
The embodiment of the invention provides a compressor, which comprises the motor.
The motor winding, the motor and the compressor provided by the invention have the following advantages:
under different working conditions, the first coil group and the second coil group of each phase winding of the motor are switched in parallel or in series, so that the power generation voltage of the motor is adjusted to adapt to the working conditions of the motor, the operation range of the motor is widened, and the working efficiency of the motor is improved.
Drawings
Other features, objects, and advantages of the present invention will become more apparent from the detailed description set forth below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a motor winding provided in an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating winding of a motor winding in a second operating state according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating winding of a motor winding in a first operating state according to an embodiment of the present invention;
FIG. 4 is a comparison of the operating efficiency of each phase winding coil set in series versus parallel at the same rotational speed;
fig. 5 is a comparison of motor currents for each phase winding coil set in series and parallel at the same rotational speed.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many 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 concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted. "or", "or" in the specification may each mean "and" or ".
To solve the technical problems in the prior art, the present invention provides a motor winding, and fig. 1 is a schematic diagram of a motor winding according to an embodiment of the present invention. As shown in fig. 1, the motor winding includes three-phase windings, i.e., a U-phase winding, a V-phase winding, and a W-phase winding; each phase winding comprises at least a first coil group and a second coil group, and each coil group comprises at least two groups of connected sub-coils. In this embodiment, each phase winding includes 2 coil groups, each coil group includes three groups of sub-coils, that is, a first coil group and a second coil group of the U-phase winding are a Ua coil group (dashed line frame in the figure) and a Ub coil group (dashed line frame in the figure), respectively, and the Ua coil group and the Ub coil group each include three groups of sub-coils connected to each other; the first coil group and the second coil group of the V-phase winding are respectively a Va coil group and a Vb coil group, and each Va coil group and each Vb coil group comprises three groups of sub-coils connected; the first coil group and the second coil group of the W-phase winding are a Wa coil group and a Wb coil group respectively, and the Wa coil group and the Wb coil group comprise three groups of connected sub-coils. In this embodiment, the number and number of turns of the sub-coils in each phase coil group are the same; in other embodiments, the number of sub-coils and the number of turns in each phase coil group may be different, and may be set according to actual needs, which is not specifically limited herein. The motor winding provided in this embodiment can be applied to a 9-slot 6-pole motor. When the motor is in a first operating state (high-speed operation), the first coil group and the second coil group of each phase winding are connected in parallel through a control element; when the motor is in the second operating state (low-speed operation), the first coil group and the second coil group are connected in series by the control element. The electric connection mode of the coil groups in each phase winding, namely the parallel connection mode or the series connection mode, is controlled by switching, so that the operation range of the motor can be widened and the working efficiency of the motor can be improved by changing the power generation voltage of the motor.
Further, as shown in fig. 1, the first ends of the sub-coils of the first coil group are connected and form the first ends of the first coil group, the outgoing lines of the first ends of the first coil group are connected with a power supply (U-phase, V-phase and W-phase), the second ends of the sub-coils of the second coil group are connected and form the second ends of the second coil group, and the outgoing lines of the second ends of the second coil group are connected to the neutral point formed by the three-phase winding.
Preferably, the control element comprises a first control element and a second control element, the first control element is arranged on the lead-out wire of the second end of the first coil group, and the second control element is arranged on the lead-out wire of the first end of the second coil group. In some embodiments, when the motor is in the first operating state, the lead-out wire of the second end of the first coil group is connected to the neutral point through the first control element, and the lead-out wire of the first end of the second coil group is connected to a power source through the second control element, i.e. the first coil group and the second coil group of each phase winding are connected in parallel. When the motor is in a second running state, the outgoing line of the second end of the first coil group passes through the first control element and the outgoing line of the first end of the second coil group passes through the second control element, so that the outgoing line of the second end of the first coil group is electrically connected with the outgoing line of the first end of the second coil group, namely, the first coil group of each phase winding is connected with the first coil group in series.
Specifically, fig. 2 is a schematic diagram of a winding manner of a motor winding when the motor is in a second operation state according to an embodiment of the present invention; fig. 3 is a schematic diagram of a winding manner of a motor winding in a first operation state of the motor according to an embodiment of the present invention. As shown in fig. 2 and 3, the motor winding is applied to a 9-slot 6-pole motor, each phase winding is respectively wound in 3 stator slots, the Ua coil group is connected in parallel with the Ub coil group when the motor is operated in a first state, namely in a high-speed operation state, the Va coil group is connected in parallel with the Vb coil group, and the Wa coil group is connected in parallel with the Wb coil group; when the motor is operated in the second state, i.e., the low-speed operation state, the Ua coil is connected in series with the Ub coil, the Va coil group is connected in series with the Vb coil group, and the Wa coil group is connected in series with the Wb coil group.
Taking a U-phase winding as an example, the motor is explained to be arranged in a winding mode under different states through a control element. And a lead wire at the first end of the Ua coil group of the U-phase winding is connected with the U-phase of the power supply, and a lead wire at the second end of the Ub coil group of the U-phase winding is connected with a neutral point formed by the three-phase winding. When the motor is in a high-speed running state, the second ends of the sub-coils of the Ua coil group are connected and form the second ends of the Ua coil group, and the outgoing lines of the second ends of the Ua coil group are electrically connected with the neutral point through a first control element (not shown in the figure); the second ends of the sub-coils of the Ub coil group are connected and form the second ends of the Ub coil group, and the lead-out wires of the first ends of the Ub coil group are connected with the U of the power supply through a second control element (not shown in the figure), so that the Ua coil group is connected in parallel with the Ub coil group; the coil groups of the V-phase winding and the W-phase winding are connected in parallel similarly. When the motor is in a low-speed running state, the second end of the Ua coil group is connected to the first end of the Ub coil group through a first control element (not shown in the figure), and after the second ends of the sub-coils of the Ua coil group are respectively connected in series with the first end of one of the sub-coils of the Ub coil group in the embodiment, the Ua coil group and the Ub coil group are connected in series; the coil sets of the V-phase winding and the W-phase winding are connected in series in the same way. In other embodiments, a second control element may be further connected to the lead-out wire at the first end of the Ub coil group, where the first control element and the second control element together control the serial connection of the Ub coil group and the Ua coil group.
Preferably, the control element is a control switch, such as a single pole double throw switch or an insulated gate transistor. The insulated gate transistor is a device formed by compounding a MOSFET and a bipolar transistor, and has the advantages of small driving power and high switching speed of the MOSFET device and the advantages of reduced saturation voltage and large capacity of the bipolar device. Of course, the control element in the present application is not limited thereto, and may be other electronic switches commonly used in the art.
In this embodiment, the Ua coil group and the Ub coil group each include 3 groups of sub-coils with the same number of turns connected in parallel, if the number of turns of one sub-coil is N, the resistance is R, and the effective cross-sectional area is a, when in a high-speed running state, because the coil groups of each phase winding are connected in parallel, the sub-coils including one Ua coil group and one Ub coil group in each stator slot of the U phase winding are set to be connected in parallel, so that the effective cross-sectional area of each U phase stator slot of the motor is 2A, the resistance is R, the generating voltage of the motor is E0, and the number of turns of the coil is N; in the low-speed running state, as the coil groups of each phase winding are connected in series, the sub-coils comprising a Ua coil group and a Ub coil group in each stator slot of the U phase winding are set to be connected in series, the effective cross-sectional area in each U phase stator slot of the motor is A, the resistance is 2R, the number of turns of the coil is 2N, the power generation voltage of the motor is in direct proportion to the number of turns of the coil, and the motor voltage can be set to be 2E0 for improving the running efficiency of the motor. Therefore, by adjusting the number n of each phase of coil groups, when the sub-coils of each phase of coil groups are connected in series, the number of turns of the single-phase effective coil of the motor can be multiplied by n, 2n and the like, so that the power generation voltage of the motor is E0 multiplied, the voltage of the motor during low-speed operation is reasonably increased, and the working efficiency of the motor is improved.
To further confirm the technical effects achieved by the present invention, fig. 4 shows the comparison of the series and parallel operating efficiencies of the coil groups of the motor at the same rotational speed, with the abscissa representing the rotational speed of the rotor and the ordinate representing the operating efficiency of the motor. As shown in fig. 4, from the test result of the motor, the working efficiency of the coil assembly is improved by 1% -2% when the coil assembly is connected in series at the same rotation speed (at a relatively low rotation speed) compared with that of the coil assembly connected in parallel. Fig. 5 is a comparison of motor currents at the same rotational speed for a motor in parallel and in series of coil sets, with the rotational speed of the rotor on the abscissa and motor current on the ordinate. As can be seen from fig. 5, in the operational stage (at a relatively low rotation speed), the motor current of the coil groups of each phase winding connected in series is reduced by about 50% compared with the motor current connected in parallel, so that the motor loss can be reduced, and the efficiency of the motor is improved.
The embodiment of the invention also provides a motor, which comprises the motor winding. The motor further comprises a stator, wherein the stator comprises a stator core, and three-phase windings are respectively wound in stator slots of the stator core; each stator slot at least comprises a sub-coil of a first coil group and a sub-coil of a second coil group of the single-phase winding.
The embodiment of the invention also provides a compressor comprising the motor. The motor and the compressor both comprise the motor winding, so that all technical effects obtained by the motor winding can be obtained, and the description is omitted herein.
In summary, the motor winding, the motor and the compressor provided by the invention have the following advantages:
under different working conditions, the first coil group and the second coil group of each phase winding of the motor are controlled to be switched in parallel or in series, the number of turns of the coils in each phase winding is changed, and the adjustment of the motor voltage is realized, so that the motor voltage is suitable for the working conditions of the motor, the working range of the motor is widened, and the working efficiency of the motor is improved.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (10)
1. A motor winding, comprising:
each phase of winding at least comprises a first coil group and a second coil group, each coil group comprises at least two groups of sub-coils connected with each other, and when the motor is in a first running state, the first coil group and the second coil group are connected in parallel through a control element; when the motor is in the second operating state, the first coil group and the second coil group are connected in series through a control element.
2. The motor winding of claim 1, wherein the first ends of the sub-coils of the first coil group are connected and form a first end of the first coil group, the lead-out wires of the first end of the first coil group are connected to a power source, the second ends of the sub-coils of the second coil group are connected and form a second end of the second coil group, and the lead-out wires of the second end of the second coil group are connected to a neutral point formed by the three-phase winding.
3. The motor winding of claim 2, wherein the control element comprises a first control element and a second control element, the first control element being provided on a second end of the first coil assembly, the second control element being provided on a first end of the second coil assembly.
4. A motor winding according to claim 3, wherein the second ends of the sub-coils of the first coil group are connected and form the second ends of the first coil group when the motor is in the first operating state, the lead wires of the second ends of the first coil group are connected to the neutral point via the first control element, the first ends of the sub-coils of the second coil group are connected and form the first ends of the second coil group, the lead wires of the first ends of the second coil group are connected to a power source via the second control element.
5. A motor winding according to claim 3, wherein the second end of the first coil assembly and the first end of the second coil assembly are electrically connected to the first end of the second coil assembly by the first control element and the second control element, respectively, when the motor is in the second operating state.
6. A motor winding according to any one of claims 1 to 5, wherein the control element is a switch.
7. The motor winding of claim 1, wherein the number of sub-coils of the coil assembly of each phase winding is the same.
8. An electric machine comprising a motor winding according to any one of claims 1-7.
9. The electric machine of claim 8, further comprising a stator core, the three-phase windings being wound in stator slots of the stator core, respectively; each stator slot at least comprises a sub-coil of a first coil group and a sub-coil of a second coil group of the single-phase winding.
10. A compressor comprising the motor of any one of claims 8 or 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210747879.0A CN117353498A (en) | 2022-06-29 | 2022-06-29 | Motor winding, motor and compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210747879.0A CN117353498A (en) | 2022-06-29 | 2022-06-29 | Motor winding, motor and compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117353498A true CN117353498A (en) | 2024-01-05 |
Family
ID=89360015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210747879.0A Pending CN117353498A (en) | 2022-06-29 | 2022-06-29 | Motor winding, motor and compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117353498A (en) |
-
2022
- 2022-06-29 CN CN202210747879.0A patent/CN117353498A/en active Pending
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