CN111555579A - Brushless double-fed motor with variable-level winding structure - Google Patents
Brushless double-fed motor with variable-level winding structure Download PDFInfo
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- CN111555579A CN111555579A CN202010468008.6A CN202010468008A CN111555579A CN 111555579 A CN111555579 A CN 111555579A CN 202010468008 A CN202010468008 A CN 202010468008A CN 111555579 A CN111555579 A CN 111555579A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K17/00—Asynchronous induction motors; Asynchronous induction generators
- H02K17/02—Asynchronous induction motors
- H02K17/12—Asynchronous induction motors for multi-phase current
- H02K17/14—Asynchronous induction motors for multi-phase current having windings arranged for permitting pole-changing
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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
- H02K3/28—Layout of windings or of connections between windings
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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- Windings For Motors And Generators (AREA)
Abstract
The invention discloses a brushless double-fed motor with a variable-level winding structure, and belongs to the technical field of motors. The brushless double-fed motor comprises a power winding and a control winding, wherein the number of pole pairs of the power winding and the control winding is p and q respectively, the wire outlet ends of the power winding and the control winding are connected in an opposite phase sequence, each branch winding of the power winding and the control winding is formed by connecting n adjacent composite coil groups in series, each composite coil group comprises a composite coil i and j, each composite coil i and j is formed by a multi-turn sub-coil and a few-turn sub-coil, the multi-turn sub-coil of the composite coil i and the few-turn sub-coil of the composite coil j are connected in series to form a branch, the few-turn sub-coil of the composite coil i and the multi-turn sub-coil of the composite coil j are connected in series to form another branch, the two branches are connected in parallel to form the composite coil group, and leads at. The invention is used for reducing the starting current and increasing the starting torque so as to improve the starting performance of the brushless double-fed motor.
Description
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a brushless double-fed motor with a variable-level winding structure.
Background
A brushless double-fed motor is a special motor. The stator of the motor is provided with two independent sets of windings, namely a power winding with p pole pairs and a control winding with q pole pairs; the rotor winding can simultaneously generate magnetic motive force with the pole pair numbers p and q respectively and different turning directions. When the motor runs stably, the two sets of windings generate rotating magnetic fields with different speeds, the rotating magnetic fields are not directly coupled, and the two sets of windings are indirectly coupled through the rotor, so that energy exchange is generated between the two sets of windings. And controlling the winding of the bidirectional frequency converter with smaller capacity to realize bidirectional flow of energy. The brushless double-fed motor has the characteristics of a synchronous motor and an asynchronous motor at the same time. The two sets of stator windings are not directly electrically connected, and the rotating magnetic fields with different pole numbers of the stator are modulated through the coupling action of the motor rotor, so that the electromechanical energy conversion and transmission of the motor are realized. According to the working principle of the brushless double-fed motor, the brushless double-fed motor is an asynchronous motor which operates synchronously, namely the motor is an asynchronous motor in essence. The characteristics of the brushless double-fed motor system that the control side frequency converter has small capacity and no collecting ring and electric brush make it have wide application prospect in the fields of frequency conversion and speed regulation, etc.
As an asynchronous motor which operates synchronously, a brushless double-fed motor also has the defects of large starting current, small starting torque and the like, and cannot meet the application occasions requiring heavy-load starting. However, unlike the common asynchronous motor, the brushless double-fed motor has the structural characteristics that the rotor windings are self-closed, no collecting ring and no electric brush are externally connected, and the brushless double-fed motor has two sets of windings with different pole numbers, and the difference from the asynchronous motor with a single pole number is large, so that the purposes of increasing the starting torque, reducing the starting current and efficiently running can not be realized by serially connecting or cutting off the starting resistor in the rotor circuit through the electric brush.
Disclosure of Invention
The invention provides a brushless double-fed motor with a variable-level winding structure, which is used for reducing starting current and increasing starting torque so as to improve the starting performance of the brushless double-fed motor.
In order to solve the technical problems, the invention adopts the following technical scheme:
a brushless double-fed motor with a variable-level winding structure comprises a power winding with p pole pairs and a control winding with q pole pairs, wherein the power winding and the control winding are respectively provided with m outgoing line ends, the m outgoing line ends of the power winding and the m outgoing line ends of the control winding are connected in an opposite phase sequence, each branch winding of the power winding and the control winding is formed by connecting n closely adjacent and separated composite coils in series, each composite coil group comprises a composite coil i and a composite coil j, each composite coil i and the composite coil j are formed by a multi-turn sub-coil and a few-turn sub-coil, the multi-turn sub-coil of the composite coil i and the few-turn sub-coil of the composite coil j are connected in series to form a branch, the small-turn sub-coils of the composite coil i and the multi-turn sub-coils of the composite coil j are connected in series to form another branch circuit, the two branch circuits are connected in parallel to form a composite coil group, and leads at two ends of the two parallel branch circuits form a series connection point of the composite coil group.
In the above technical scheme:
the connection mode of the power winding and the control winding is preferably that the power winding and the control winding are connected in series in a 3Y/3Y phase-changing pole-changing reverse phase sequence mode, and the q of the control winding isaPhase, qbPhase, qcPhase and power winding paPhase, pbPhase, pcBetween each other is provided with A1i、B1i、C1i、A2i、B2i、C2i、A3i、B3iAnd C3iNine branches in total; wherein A is1i、B1i、C1iTo belong to qaThree parallel branches of a phase, A2i、B2i、C2iTo belong to qbThree parallel branches of a phase, A3i、B3i、C3iTo belong to qcThree parallel branches of a phase, A1i、A2i、A3iIs a member of paThree parallel branches of a phase, B1i、B2i、B3iIs a member of pbThree parallel branches of a phase, C1i、C2i、C3iIs a member of pcThree parallel branches of a phase.
Further, the pole pair number p/q of the power winding and the control winding is 5/2.
Further, the number of the rotor slots of the brushless doubly-fed motor is 60.
Further, the power winding and the control winding are phase-separated according to a 120-degree phase band.
Compared with the prior art, the invention has the advantages that:
the invention applies the composite coil group and the variable-level winding to the brushless double-fed motor, when the composite coil group is started, the effective turns of each phase of the rotor can be reduced, so that the conversion value of the rotor resistance when converted to the stator side is multiplied and increased, and the leakage reactance conversion value of the rotor is kept unchanged, thereby increasing the starting torque of the motor, reducing the starting current, and realizing the purposes of increasing the starting torque, reducing the starting current and efficiently operating the motor.
Drawings
Fig. 1 is a schematic structural view of a preferred embodiment of the present invention.
Fig. 2 is a schematic structural diagram of the composite coil assembly of the embodiment of fig. 1.
Fig. 3 is a diagram of the rotor slot number winding of the embodiment of fig. 1.
Detailed Description
The present invention will now be described with reference to the accompanying drawings, wherein the specific embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive thereof.
As shown in fig. 1 and fig. 2, the brushless doubly-fed machine with the step-variable winding structure of the present embodiment includes a power winding with p pole pairs and a control winding with q pole pairs. The power winding and the control winding are respectively provided with three wire outlet ends, and the three wire outlet ends of the power winding and the three wire outlet ends of the control winding are connected in an anti-phase sequence. Each branch winding of the power winding and the control winding is formed by connecting n closely adjacent and separated composite coil groups in series, each composite coil group comprises a composite coil i and a composite coil j, each of the composite coil i and the composite coil j is formed by a multi-turn sub-coil and a few-turn sub-coil, the multi-turn sub-coil of the composite coil i and the few-turn sub-coil of the composite coil j are connected in series to form one branch, the few-turn sub-coil of the composite coil i and the multi-turn sub-coil of the composite coil j are connected in series to form the other branch, the two branches are connected in parallel to form the composite coil group, and leads at two ends of the two branches which are connected in parallel form a series connection point of the composite.
In particularThe connection mode of the power winding and the control winding is that 3Y/3Y phase change and pole change are connected in series in an inverted phase sequence. Q of control windingaPhase, qbPhase, qcPhase and power winding paPhase, pbPhase, pcBetween each other is provided with A1i、B1i、C1i、A2i、B2i、C2i、A3i、B3iAnd C3iNine branches in total; where i is 1, 2 … n, and each specific value of i represents a composite coil set. More specifically, A1i、B1i、C1iTo belong to qaThree parallel branches of a phase, A2i、B2i、C2iTo belong to qbThree parallel branches of a phase, A3i、B3i、C3iTo belong to qcThree parallel branches of a phase; a. the1i、A2i、A3iIs a member of paThree parallel branches of a phase, B1i、B2i、B3iIs a member of pbThree parallel branches of a phase, C1i、C2i、C3iIs a member of pcThree parallel branches of a phase.
As shown in fig. 3, the brushless doubly-fed machine of the present embodiment has a rotor slot number z of 60, a power winding pole number 2p of 10, and a control winding pole number 2q of 4, that is, p/q of 5/2. The power winding and the control winding are split into phases according to a phase band of 120 degrees. Fig. 3 is a slot number winding diagram of the rotor, and superscripts on slot numbers indicate turns ratios of coils on corresponding slot numbers. When the winding is performed at the turn ratio shown in the figure, the induced electromotive forces of the 3 series-connected compound coil groups belonging to the same phase are the same, and the induced electromotive forces of the compound coil groups belonging to different phases have the same amplitude and the phase difference of 120 degrees no matter under p or q pairs of poles. Tests prove that when the load torque of 10 N.m is applied during starting, the average value of the rotating speed after the rotating speed is stabilized is 450r/min, and the average value of the phase current peak value of the power winding is 18.50A; after the coil is replaced by the conventional coil, under the same load torque, the mean value of the rotating speed after the rotating speed is stabilized is 460r/min, and the mean value of the phase current peak value of the power winding is 6.15A. Obviously, the invention is beneficial to increasing the starting torque of the brushless doubly-fed motor and reducing the starting current of the brushless doubly-fed motor.
Claims (5)
1. A brushless double-fed motor of a variable-level winding structure is characterized in that:
the power winding and the control winding are respectively provided with m outgoing line ends, the m outgoing line ends of the power winding and the m outgoing line ends of the control winding are connected in an opposite phase sequence, each branch winding of the power winding and the control winding is formed by connecting n closely adjacent and separated composite coils in series, each composite coil group comprises a composite coil i and a composite coil j, each composite coil i and the composite coil j are formed by a plurality of turns of sub-coils and a few turns of sub-coils, the plurality of turns of sub-coils of the composite coil i and the few turns of sub-coils of the composite coil j are connected in series to form a branch, the small-turn sub-coils of the composite coil i and the multi-turn sub-coils of the composite coil j are connected in series to form another branch circuit, the two branch circuits are connected in parallel to form a composite coil group, and leads at two ends of the two parallel branch circuits form a series connection point of the composite coil group.
2. A brushless doubly fed machine according to claim 1, characterized in that:
the connection mode of the power winding and the control winding is that the 3Y/3Y phase-changing pole-changing reverse phase sequence is connected in series, and the q of the control windingaPhase, qbPhase, qcPhase and power winding paPhase, pbPhase, pcBetween each other is provided with A1i、B1i、C1i、A2i、B2i、C2i、A3i、B3iAnd C3iNine branches in total; wherein A is1i、B1i、C1iTo belong to qaThree parallel branches of a phase, A2i、B2i、C2iTo belong to qbThree parallel branches of a phase, A3i、B3i、C3iTo belong to qcThree parallel branches of a phase, A1i、A2i、A3iIs a member of paThree parallel branches of a phase, B1i、B2i、B3iIs a member of pbThree parallel branches of a phase, C1i、C2i、C3iIs a member of pcThree parallel branches of a phase.
3. A brushless doubly fed machine according to claim 2, characterized in that:
the pole pair number p/q of the power winding and the control winding is 5/2.
4. A brushless doubly fed machine according to claim 3, characterized in that:
the number of the rotor slots of the brushless doubly-fed motor is 60.
5. A brushless doubly fed machine according to claim 2, 3 or 4, characterized in that:
and the power winding and the control winding are split in phase according to a 120-degree phase band.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010468008.6A CN111555579A (en) | 2020-05-28 | 2020-05-28 | Brushless double-fed motor with variable-level winding structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010468008.6A CN111555579A (en) | 2020-05-28 | 2020-05-28 | Brushless double-fed motor with variable-level winding structure |
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| CN111555579A true CN111555579A (en) | 2020-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010468008.6A Pending CN111555579A (en) | 2020-05-28 | 2020-05-28 | Brushless double-fed motor with variable-level winding structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112117876A (en) * | 2020-09-15 | 2020-12-22 | 合肥工业大学 | High-synchronization speed difference modulation brushless double-fed motor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1124882A (en) * | 1994-12-12 | 1996-06-19 | 华中理工大学 | AC motor rotor winding using circulating current removing technique and connecting method thereof |
| CN1378326A (en) * | 2002-03-08 | 2002-11-06 | 华中科技大学 | AC brushless double feed motor |
| CN1558535A (en) * | 2004-01-17 | 2004-12-29 | 华中科技大学 | An induction motor with wound rotor |
| CN102195376A (en) * | 2011-05-30 | 2011-09-21 | 安徽奥讯信息科技有限公司 | Brushless double-fed motor |
| DE102011114139A1 (en) * | 2011-09-23 | 2013-03-28 | Sew-Eurodrive Gmbh & Co. Kg | Electric motor, in particular pole-changing motor, method for operating an electric motor and electric motor |
-
2020
- 2020-05-28 CN CN202010468008.6A patent/CN111555579A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1124882A (en) * | 1994-12-12 | 1996-06-19 | 华中理工大学 | AC motor rotor winding using circulating current removing technique and connecting method thereof |
| CN1378326A (en) * | 2002-03-08 | 2002-11-06 | 华中科技大学 | AC brushless double feed motor |
| CN1558535A (en) * | 2004-01-17 | 2004-12-29 | 华中科技大学 | An induction motor with wound rotor |
| CN102195376A (en) * | 2011-05-30 | 2011-09-21 | 安徽奥讯信息科技有限公司 | Brushless double-fed motor |
| DE102011114139A1 (en) * | 2011-09-23 | 2013-03-28 | Sew-Eurodrive Gmbh & Co. Kg | Electric motor, in particular pole-changing motor, method for operating an electric motor and electric motor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112117876A (en) * | 2020-09-15 | 2020-12-22 | 合肥工业大学 | High-synchronization speed difference modulation brushless double-fed motor |
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Application publication date: 20200818 |