CN117578775A - 4-pole 18-slot three-phase permanent magnet synchronous motor single and double layer hybrid chain winding - Google Patents

Abstract

The invention discloses a single-double layer mixed chain winding of a 4-pole 18-slot three-phase permanent magnet synchronous motor, which is characterized in that: each phase winding consists of 2 double-layer coils and 2 single-layer coils, and the number of turns of the double-layer coils is half of that of the single-layer coils; each double-layer coil has a span of 3 slots, and each single-layer coil has a span of 4 slots; the total number of coils of one motor is reduced from 18 of the traditional fractional slot double-layer short-distance distributed windings to 12, and the coil inserting workload is reduced; the single-layer coil edges are embedded in the 12 slots, so that inter-phase insulation in the slots is not needed, the coil embedding is convenient, and the slot insulation materials are saved; the span of the 6 double-layer coils is 1 slot shorter, the copper consumption is slightly reduced, and the corresponding copper consumption is reduced. The permanent magnet induction electromotive force and the opponent reaction magnetomotive force in the motor are the same as those of a fractional slot double-layer short-distance distributed winding with the coil span of 4 slots of the 4-pole 18-slot three-phase permanent magnet synchronous motor.

Description

4-pole 18-slot three-phase permanent magnet synchronous motor single and double layer hybrid chain winding

Technical field

The invention belongs to the field of electrical engineering and relates to a single-double-layer hybrid chain winding of a 4-pole 18-slot three-phase permanent magnet synchronous motor.

Background technique

Electric submersible pumps have been widely used in oil recovery. The early submersible motors used asynchronous motors, and the number of permanent magnet synchronous motors used today is increasing year by year. Limited by the inner diameter of the oil pipe, the inner and outer diameter of the stator of the submersible permanent magnet synchronous motor is relatively small. The number of poles of the submersible permanent magnet synchronous motor with higher speed is mostly selected as 4 poles. When selecting the number of stator slots, the performance of the motor and the production cost are taken into consideration. , it is generally hoped that the number of stator slots is less in order to obtain a larger stator slot shape, make full use of the slot area, and reduce the intensity of stator slot threading work. One of the options is to set the number of stator slots to 18 slots.

In the aerospace field, the servo-driven permanent magnet synchronous motor has high speed, extremely low moment of inertia, a slender rotor with a small outer diameter, and the number of stator slots cannot be too many. The choice of a 4-pole 18-slot permanent magnet synchronous motor is also one of the more reasonable choices. .

For a 4-pole 18-slot three-phase permanent magnet synchronous motor, the number of slots per pole per phase is 3/2, and the three-phase stator winding often uses fractional slot double-layer short-pitch distributed windings. When fractional slot double-layer short-pitch distributed windings are used, the permanent magnet electromotive force fundamental wave winding coefficient is high, the permanent magnet electromotive force harmonic winding coefficient is low, the permanent magnet induced electromotive force waveform is better, and the number of cogging torques in one rotation of the rotor is the same as that of 4-pole 36 Slotted three-phase permanent magnet synchronous motor. The electromagnetic performance is not only good, but the manufacturing cost is also low.

The 4-pole 18-slot three-phase permanent magnet synchronous motor has many application scenarios. Improving the stator winding winding and embedding method can reduce its processing cost and improve its efficiency.

Contents of the invention

The present invention improves the winding and embedding method of the commonly used 4-pole 18-slot three-phase fractional slot double-layer short-pitch distributed windings, and proposes a 4-pole 18-slot three-phase permanent magnet synchronous motor single-double-layer hybrid chain type winding.

The present invention is a 4-pole 18-slot three-phase permanent magnet synchronous motor with single and double-layer hybrid chain windings, which is characterized by:

Each phase winding is composed of 2 double-layer coils and 2 single-layer coils. The number of turns of the double-layer coil is half of the number of turns of the single-layer coil. The span of each double-layer coil is 3 slots. The span of each single-layer coil is The distance is 4 slots. The three-phase stator winding has a total of 6 double-layer coils and 6 single-layer coils, with a total of 24 coil sides.

The distribution order of the coil sides embedded in the 18 stator slots is: only one single-layer coil side is embedded in each of the two adjacent slots, and these two single-layer coil sides belong to different phases, and the subsequent one Two double-layer coil sides belonging to different phase windings are embedded in the lower and upper layers of the slot respectively; then, only one single-layer coil side is embedded in the two adjacent slots, and these two single-layer coils The edges belong to different phases, and two double-layer coil edges belonging to different phase windings are embedded in the lower and upper layers of the subsequent slot. In this way, a total of 6 cycles are performed, and 6 of the three-phase windings are embedded in the 18 slots. 2 double layer coils and 6 single layer coils on all 24 coil sides.

The order in which the two double-layer coils and two single-layer coils of each phase winding are arranged in the stator core space is: the first double-layer coil of this phase, the first single-layer coil of this phase, and the first single-layer coil of this phase. The 2nd double layer coil and the 2nd single layer coil of this phase.

The spatial distribution characteristics of the 8 coil sides of the 18 stator slots on the stator core in which the 4 coils of each phase are embedded are as follows: the slot of the tail end coil side of the first double-layer coil of each phase is different from the slot. The slots where the coil sides at the first end of the first single-layer coil of the phase are located are adjacent, and the current directions in the two coil sides are consistent; the slots where the tail coil sides of the first single-layer coil of the phase are located are the same as those of the phase. The slots where the coil side of the first end of the second double-layer coil is located are adjacent, and the current directions in the two coil sides are consistent, and the current direction has changed; the slot of the tail coil side of the second double-layer coil of this phase is located It is adjacent to the slot where the coil side of the first end of the second single-layer coil of this phase is located, and the current directions in these two coil sides are consistent, and the current direction changes again; the tail end of the second single-layer coil of this phase The slot where the coil side is located is adjacent to the slot where the coil side of the first double-layer coil of this phase is located, and the current directions in these two coil sides are consistent, and the current direction changes at the same time; 4 of each phase The coils are arranged together on the stator core like a "chain" connected by a "small ring" and a "large ring", which is called a single-double-layer hybrid chain winding.

The coil sides of the UVW three-phase winding of the three-phase permanent magnet synchronous motor are embedded in the 18 slots in the order of distribution: in the first slot, only the tail end coil side of the second single-layer coil of the U phase is embedded; in the second slot, The lower layer is embedded with the first end coil side of the first double-layer coil of U phase, and the upper layer is embedded with the tail end coil side of the second double-layer coil of W phase; in the third slot, only the first end of the second single-layer coil of W phase is embedded. Coil side; in the 4th slot, only the tail end coil side of the second single-layer coil of V phase is embedded; in the 5th slot, the first end coil side of the V-phase first double-layer coil is embedded in the lower layer, and the U phase is embedded in the upper layer. The tail end coil side of the first double-layer coil; in slot 6, only the first end coil side of the first single-layer coil of U phase is embedded; in the seventh slot, only the tail end of the second single-layer coil of W phase is embedded Coil side; in the 8th slot, the lower layer is embedded with the first end coil side of the W-phase first double-layer coil, and the upper layer is embedded with the V-phase first double-layer coil with the tail end coil side; in the 9th slot, only the V-phase is embedded The first end coil side of the first single-layer coil; in the 10th slot, only the tail end coil side of the U-phase first single-layer coil is embedded; in the 11th slot, the lower layer is embedded with the first end of the U-phase second double-layer coil On the coil side, the upper layer is embedded with the tail end coil side of the first double-layer coil of W phase; in the 12th slot, only the first end coil side of the W-phase first single-layer coil is embedded; in the 13th slot, only the V phase is embedded The tail end coil side of the second single-layer coil; in the 14th slot, the first end coil side of the V-phase second double-layer coil is embedded in the lower layer, and the tail end coil side of the U-phase second double-layer coil is embedded in the upper layer; the 15th In the slot, only the first end coil side of the second single-layer coil of U phase is embedded; in the 16th slot, only the tail end coil side of the first single-layer coil of W phase is embedded; in the 17th slot, the W phase is embedded in the lower layer. The first-end coil side of the second double-layer coil is embedded in the upper layer, and the tail-end coil side of the second V-phase double-layer coil is embedded in the upper layer; in the 18th slot, only the first-end coil side of the second V-phase single-layer coil is embedded.

There are many ways to connect two double-layer coils and two single-layer coils of each phase winding to form a phase winding. There are three typical phase winding connection methods.

Phase winding connection method 1: Connect the end of the first double-layer coil of each phase to the end of the first single-layer coil of the phase to form the first phase winding branch of the phase; the second phase of each phase The tail end of a double-layer coil is connected to the tail end of the second single-layer coil of the phase to form the second phase winding branch of the phase. Connect the two phase winding branches of each phase in series, that is, the first end of the first single-layer coil of the phase is connected to the first end of the second double-layer coil of the phase, and the number of parallel branches of the phase is 1 A phase winding; at this time, the first end of the first single-layer coil of this phase constitutes the first end of the phase winding, and the first end of the second single-layer coil of this phase is the tail end of the phase winding. Connect the three tail ends of the three-phase winding to form a Y-shaped star contact N, and obtain a Y-connected three-phase symmetrical winding; when the three-phase permanent magnet synchronous motor is running, the three first ends of the three-phase winding are connected to its power supply.

Phase winding connection method 2: Connect the end of the first double-layer coil of each phase to the end of the first single-layer coil of the phase to form the first phase winding branch of the phase; the second phase of each phase The tail end of a double-layer coil is connected to the tail end of the second single-layer coil of the phase to form the second phase winding branch of the phase. Connect the two phase winding branches of each phase in parallel to obtain a one-phase winding with a number of parallel branches of 2 for that phase. Connect the three tail ends of the three branches of the three-phase winding arranged in the front half of the stator to form a Y-shaped star contact N1, and then connect the three tail ends of the three branches of the three-phase winding arranged in the front half of the stator. The ends are connected to form a Y-shaped star contact N2, and a three-phase symmetrical winding with a double Y connected to two parallel branches is obtained; the first ends of the two parallel branches of the three-phase windings are connected together as the first end of the three-phase winding winding. When the three-phase permanent magnet synchronous motor is running, the three first ends of the three-phase windings are connected to its power supply.

Phase winding connection method three: first connect the tail end of the first double-layer coil of each phase to the first end of the second double-layer coil of that phase, and then connect the tail end of the second double-layer coil of that phase to the first end of the second double-layer coil of that phase. The tail end of the second single-layer coil of the phase is connected, and finally the head end of the second single-layer coil of the phase is connected to the tail end of the first single-layer coil of the phase to form the phase winding; at this time, the The first end of the first double-layer coil of a phase constitutes the first end of the phase winding, and the first end of the second single-layer coil of the phase constitutes the tail end of the phase winding. Connect the three tail ends of the three-phase winding to form a Y-shaped star contact N, and obtain a Y-connected three-phase symmetrical winding; when the three-phase permanent magnet synchronous motor is running, the three first ends of the three-phase winding are connected to its power supply.

The 4-pole 18-slot three-phase permanent magnet synchronous motor of the present invention has a single-double-layer hybrid chain winding. Each phase winding is composed of 2 double-layer coils and 2 single-layer coils. The number of double-layer coil turns is equal to the number of single-layer coil turns. Half, each double-layer coil spans 3 slots, and each single-layer coil spans 4 slots; the total number of coils in the entire motor is reduced from 18 in the traditional fractional-slot double-layer short-pitch distributed winding to 12. The workload of wire embedding has been reduced; single-layer coil edges are embedded in 12 slots, and interphase insulation in the slots is no longer required, saving slot insulation materials and making wire embedding convenient; the span of the six double-layer coils is shortened by one slot, The amount of copper used is slightly reduced, and the corresponding copper loss is reduced.

When the submersible permanent magnet synchronous motor adopts the winding of the present invention, the stator core adopts a closed slot, and the embedding process of the conductor in the slot is changed to a threading process. The threading process will be simplified and the work intensity will be reduced. When the aerospace steering gear drives the permanent magnet synchronous motor using the winding of the present invention, the weight is reduced and the efficiency is improved.

Description of the drawings

Figure 1 is the electromotive force star diagram of the stator slot conductor of a 4-pole 18-slot permanent magnet synchronous motor and its phase separation according to 60° phase zones.

Figure 2 is the stator slot phase separation result of a 4-pole 18-slot permanent magnet synchronous motor.

Figure 3 is an expanded view of the fractional slot double-layer short-pitch distributed winding of a traditional 4-pole 18-slot permanent magnet synchronous motor with one parallel branch per phase winding.

Figure 4 is a schematic diagram of the upper and lower coil sides in the slot when a traditional 4-pole 18-slot permanent magnet synchronous motor with a number of parallel branches per phase winding of 1 is embedded in the slot.

Figure 5 is a schematic diagram of the coil side in the slot when a 4-pole 18-slot three-phase permanent magnet synchronous motor with single and double-layer hybrid chain windings is embedded in the slot.

Figure 6 is one of the unfolded views of the single- and double-layer hybrid chain windings of a 4-pole 18-slot three-phase permanent magnet synchronous motor.

Figure 7 is an expanded view of the U-phase single-double-layer hybrid chain winding in a 4-pole 18-slot three-phase permanent magnet synchronous motor.

Figure 8 is the second expansion diagram of the single-double-layer hybrid chain winding of a 4-pole 18-slot three-phase permanent magnet synchronous motor.

Figure 9 is the third expansion diagram of the single-double-layer hybrid chain winding of a 4-pole 18-slot three-phase permanent magnet synchronous motor.

Detailed ways

The implementation proposed by the present invention will be described with reference to FIGS. 1 to 9 .

For a 4-pole 18-slot permanent magnet synchronous motor, the number of stator slots Z=18, the number of poles 2p=4, and the number of phases m=3. Its polar distance is

The number of slots per pole and phase is

For the fundamental wave of 2 pairs of poles, the electrical angle between the slots is

Based on the above data, the electromotive force star diagram of the stator slot conductor of the 4-pole 18-slot permanent magnet synchronous motor shown in Figure 1 can be drawn. At the same time, in Figure 1, the electromotive force star diagram of the stator slot conductor is divided into phases according to 60° phase zones, and according to 60° ° After phase separation, the 4-pole 18-slot permanent magnet synchronous motor stator slot phase separation result shown in Figure 2 is obtained; when the span of the coil y ₁ = 4 slots is selected, the phase separation result shown in Figure 2 can be drawn Figure 3 shows the expansion diagram of the fractional slot double-layer short-pitch distributed winding of a traditional 4-pole 18-slot permanent magnet synchronous motor with a number of parallel branches per phase winding of 1.

Slot conductors constitute the coil sides. For fractional slot double-layer short-pitch distributed windings, the coil sides embedded in the slots are divided into "upper coil sides" and "lower coil sides". When it is considered that the "solid line" in Figure 3 represents the "lower coil side" embedded in the lower layer of the slot, and the "dashed line" represents the "upper coil side" embedded in the upper layer of the slot, then the slot shown in Figure 4 can be obtained Schematic diagram of the upper and lower coil sides in the slot when a traditional 18-slot 4-pole permanent magnet synchronous motor with 1 parallel branch number per phase winding is embedded in the fractional slot double-layer short-pitch distributed winding. In Figure 4, when the coil side is marked with "phase name +", that is, when "U+", "V+", and "W+" are marked, it means that the coil side should be connected in series to the phase winding in the forward direction; the coil side is marked with "phase name" -", that is, when marked with "U-", "V-", or "W-", it means that the coil side should be connected in series to the phase winding in reverse.

Analyzing the coil edges that all belong to the U phase in Figure 4, it can be seen that in slot 1, the upper and lower coil edges all belong to "U+"; in slot 2, the lower coil edge belongs to "U+"; in slot 5, the upper coil edge belongs to "U" -"; in slot 6, the edges of the upper and lower coils all belong to "U-"; in slot 2, the edges of the lower coil belong to "U+"; in slot 10, the edges of the upper and lower coils all belong to "U+"; in slot 11, The lower coil edge belongs to "U+"; in slot 14, the upper coil edge belongs to "U-"; in slot 15, the upper and lower coil edges all belong to "U-".

Analyzing all the coil edges belonging to the V phase in Figure 4, it can be seen that in slot 4, the upper and lower coil edges all belong to "V+"; in slot 5, the lower coil edge belongs to "V+"; in slot 8, the upper coil edge belongs to "V -"; in slot 9, the edges of the upper and lower coils all belong to "V-"; in slot 13, the edges of the upper and lower coils all belong to "V+"; in slot 14, the edges of the lower coil belong to "V+"; in slot 17, The upper coil edge belongs to "V-"; in slot 18, the upper and lower coil edges all belong to "V-".

Analyzing all the coil edges belonging to W phase in Figure 4, it can be seen that in slot 7, the upper and lower coil edges all belong to "W+"; in slot 8, the lower coil edge belongs to "W+"; in slot 11, the upper coil edge belongs to "W" -"; in slot 12, the edges of the upper and lower coils all belong to "W-"; in slot 16, the edges of the upper and lower coils all belong to "W+"; in slot 17, the edges of the lower coil belong to "W+"; in slot 2, The upper coil edge belongs to "W-"; in slot 3, the upper and lower coil edges all belong to "W-".

From the above analysis, it can be seen that the coil sides of each phase winding have such a pattern. The upper and lower layers in the slot have coil sides with the same "phase name -" and the upper and lower layers in the slot have the same "phase name +". There are no other coil sides of this phase winding between the coil sides, and the distance between such two slots is 4 slots; and the coil side with "phase name +" in the lower slot and the "phase name" in the upper slot -" There are no other coil sides of this phase winding between the coil sides, and the distance between such two slots is 3 slots. Connect the coil edges with the same "phase name -" in the upper and lower layers of two slots with a slot distance of 4 slots to the coil edges with the same "phase name +" in the upper and lower layers of the slot to form a span. It is a single-layer coil with 4 slots and the number of turns is 1 times the number of turns of the double-layer winding coil. The span of the new single-layer coil is the same as the span of the original double-layer coil; the distance between the two slots is 3 slots. The coil edge with "phase name +" in the middle and lower layers is connected with the coil edge with "phase name +" in the upper layer of the slot to form a new double-layer coil with a span of 3 slots and a constant number of turns. The span of the layer coil is 1 slot shorter than the span of the original double-layer coil. In this way, the three-phase winding is transformed into a hybrid winding of single-layer coil and double-layer coil. At this time, each phase winding is composed of 2 double-layer coils and 2 single-layer coils. The number of double-layer coil turns is Half the number of turns of the single-layer coil, the span of each double-layer coil is 3 slots, and the span of each single-layer coil is 4 slots; the total number of coils of the entire motor is 18 times that of the traditional fractional-slot double-layer short-pitch distributed winding The number of wires is reduced to 12, and the workload of inlaying wires is reduced; single-layer coil edges are embedded in 12 slots. There is no need to do phase insulation in the slots in these 12 slots. It is convenient to inlay wires and save slot insulation materials; 6 double-layer coils The span is one slot shorter, the amount of copper used is slightly reduced, and the corresponding copper loss is reduced.

When the three-phase winding is transformed into a hybrid winding of single-layer coil and double-layer coil, the distribution sequence of the 18 stator slots on the side of the coil embedded in the stator core becomes: 1 single-layer coil is embedded in each of the 2 adjacent slots. layer coil sides, and these two single-layer coil sides belong to different phases, and then two slots belonging to different phase winding double-layer coil sides are embedded in one slot; then, two adjacent slots are embedded respectively. 1 single-layer coil side, and these 2 single-layer coil sides belong to different phases, and then 1 slot is embedded with 2 double-layer coil sides belonging to different phase windings; this cycle is repeated 6 times in total, and 18 slots are All are assigned to three-phase windings.

Whether it is a single-layer coil or a double-layer coil, each coil edge has a lead-out end. When the coil edges are sorted in the order of slots 1 to 18, the coil edge that appears first is called the first-end coil edge, and the coil edge that appears later The coil side is called the tail coil side.

The coil sides of the UVW three-phase winding of the three-phase permanent magnet synchronous motor are embedded in the 18 slots in the order of distribution: in the first slot, only the tail end coil side of the second single-layer coil of the U phase is embedded; in the second slot, The lower layer is embedded with the first end coil side of the first double-layer coil of U phase, and the upper layer is embedded with the tail end coil side of the second double-layer coil of W phase; in the third slot, only the first end of the second single-layer coil of W phase is embedded. Coil side; in the 4th slot, only the tail end coil side of the second single-layer coil of V phase is embedded; in the 5th slot, the first end coil side of the V-phase first double-layer coil is embedded in the lower layer, and the U phase is embedded in the upper layer. The tail end coil side of the first double-layer coil; in slot 6, only the first end coil side of the first single-layer coil of U phase is embedded; in the seventh slot, only the tail end of the second single-layer coil of W phase is embedded Coil side; in the 8th slot, the lower layer is embedded with the first end coil side of the W-phase first double-layer coil, and the upper layer is embedded with the V-phase first double-layer coil with the tail end coil side; in the 9th slot, only the V-phase is embedded The first end coil side of the first single-layer coil; in the 10th slot, only the tail end coil side of the U-phase first single-layer coil is embedded; in the 11th slot, the lower layer is embedded with the first end of the U-phase second double-layer coil On the coil side, the upper layer is embedded with the tail end coil side of the first double-layer coil of W phase; in the 12th slot, only the first end coil side of the W-phase first single-layer coil is embedded; in the 13th slot, only the V phase is embedded The tail end coil side of the second single-layer coil; in the 14th slot, the first end coil side of the V-phase second double-layer coil is embedded in the lower layer, and the tail end coil side of the U-phase second double-layer coil is embedded in the upper layer; the 15th In the slot, only the first end coil side of the second single-layer coil of U phase is embedded; in the 16th slot, only the tail end coil side of the first single-layer coil of W phase is embedded; in the 17th slot, the W phase is embedded in the lower layer. The first-end coil side of the second double-layer coil is embedded in the upper layer, and the tail-end coil side of the second V-phase double-layer coil is embedded in the upper layer; in the 18th slot, only the first-end coil side of the second V-phase single-layer coil is embedded.

The schematic diagram of the coil side in the slot when a 4-pole 18-slot three-phase permanent magnet synchronous motor with single and double-layer hybrid chain windings is embedded in the slot is shown in Figure 5. In the figure, the "thin line" represents the double-layer coil, and the "thick line" represents the single-layer coil.

Each phase winding consists of 2 double-layer coils and 2 single-layer coils arranged in the stator core space in order of the first double-layer coil of the phase, the first single-layer coil of the phase, and the first single-layer coil of the phase. The 2nd double layer coil and the 2nd single layer coil of this phase.

The first double-layer coil of the U-phase winding is composed of the lower coil side belonging to "U+" in slot 2 and the upper coil side belonging to "U-" in slot 5; the first single-layer coil of the U-phase winding is composed of The single-layer coil side belonging to "U-" in slot 6 is composed of the single-layer coil side belonging to "U+" in slot 10; the second double-layer coil of the U-phase winding is composed of the lower coil side belonging to "U+" in slot 11 The side is composed of the upper coil side belonging to "U-" in slot 14; the second single-layer coil of the U-phase winding is composed of the single-layer coil side belonging to "U-" in slot 15 and the side belonging to "U+" in slot 1. Made of single layer coil edge.

The first double-layer coil of the V-phase winding is composed of the lower coil side belonging to "V+" in slot 5 and the upper coil side belonging to "V-" in slot 8; the first single-layer coil of the V-phase winding is composed of The single-layer coil side belonging to "V-" in slot 9 is composed of the single-layer coil side belonging to "V+" in slot 13; the second double-layer coil of the V-phase winding is composed of the lower coil side belonging to "V+" in slot 14 The side is composed of the upper coil side belonging to "V-" in slot 17; the second single-layer coil of the V-phase winding is composed of the single-layer coil side belonging to "V-" in slot 18 and the side belonging to "V+" in slot 4. Made of single layer coil edge.

The first double-layer coil of the W-phase winding is composed of the lower coil side belonging to "W+" in slot 8 and the upper coil side belonging to "W-" in slot 11; the first single-layer coil of the W-phase winding is composed of The single-layer coil side belonging to "W-" in slot 12 is composed of the single-layer coil side belonging to "W+" in slot 16; the second double-layer coil of the W-phase winding is composed of the lower coil side belonging to "W+" in slot 17 The side is composed of the upper coil side belonging to "W-" in slot 2; the second single-layer coil of the W-phase winding is composed of the single-layer coil side belonging to "W-" in slot 3 and the side belonging to "W+" in slot 7. Made of single layer coil edge.

The spatial distribution characteristics of the 8 coil sides of the 18 stator slots on the stator core in which the 4 coils of each phase are embedded are as follows: the slot of the tail end coil side of the first double-layer coil of each phase is different from the slot. The slots where the coil sides at the first end of the first single-layer coil of the phase are located are adjacent, and the current directions in the two coil sides are consistent; the slots where the tail coil sides of the first single-layer coil of the phase are located are the same as those of the phase. The slots where the coil side of the first end of the second double-layer coil is located are adjacent, and the current directions in the two coil sides are consistent, and the current direction has changed; the slot of the tail coil side of the second double-layer coil of this phase is located It is adjacent to the slot where the coil side of the first end of the second single-layer coil of this phase is located, and the current directions in these two coil sides are consistent, and the current direction changes again; the tail end of the second single-layer coil of this phase The slot where the coil side is located is adjacent to the slot where the coil side of the first double-layer coil of this phase is located, and the current directions in these two coil sides are consistent, and the current direction changes at the same time; 4 of each phase The coils are arranged together on the stator core like a "chain" connected by a "small ring" and a "large ring", which is called a single-double-layer hybrid chain winding.

There are many ways to connect two double-layer coils and two single-layer coils of each phase winding to form a phase winding. There are three typical phase winding connection methods.

Phase winding connection method 1: Connect the end of the first double-layer coil of each phase to the end of the first single-layer coil of the phase to form the first phase winding branch of the phase; the second phase of each phase The tail end of a double-layer coil is connected to the tail end of the second single-layer coil of the phase to form the second phase winding branch of the phase. Connect the two phase winding branches of each phase in series, that is, the first end of the first single-layer coil of the phase is connected to the first end of the second double-layer coil of the phase, and the number of parallel branches of the phase is 1 A phase winding; at this time, the first end of the first single-layer coil of this phase constitutes the first end of the phase winding, and the first end of the second single-layer coil of this phase is the tail end of the phase winding. Connect the three tail ends of the three-phase winding to form a Y-shaped star contact N, and obtain a Y-connected three-phase symmetrical winding; when the three-phase permanent magnet synchronous motor is running, the three first ends of the three-phase winding are connected to its power supply. After all connections are completed, the expanded view of the single-double-layer hybrid chain winding of a 4-pole 18-slot three-phase permanent magnet synchronous motor with a phase winding of one parallel branch is shown in Figure 6, in which the expanded view of the U-phase winding is shown in Figure 7 shown.

Phase winding connection method 2: Connect the end of the first double-layer coil of each phase to the end of the first single-layer coil of the phase to form the first phase winding branch of the phase; the second phase of each phase The tail end of a double-layer coil is connected to the tail end of the second single-layer coil of the phase to form the second phase winding branch of the phase. Connect the two phase winding branches of each phase in parallel to obtain a one-phase winding with a number of parallel branches of 2 for that phase. Connect the three tail ends of the three branches of the three-phase winding arranged in the front half of the stator to form a Y-shaped star contact N1, and then connect the three tail ends of the three branches of the three-phase winding arranged in the front half of the stator. The ends are connected to form a Y-shaped star contact N2, and a three-phase symmetrical winding with a double Y connected to two parallel branches is obtained; the first ends of the two parallel branches of the three-phase windings are connected together as the first end of the three-phase winding winding. When the three-phase permanent magnet synchronous motor is running, the three first ends of the three-phase windings are connected to its power supply. After all connections are completed, the phase windings of the 4-pole 18-slot three-phase permanent magnet synchronous motor with two parallel branches are expanded as shown in Figure 8.

Phase winding connection method three: first connect the tail end of the first double-layer coil of each phase to the first end of the second double-layer coil of that phase, and then connect the tail end of the second double-layer coil of that phase to the first end of the second double-layer coil of that phase. The tail end of the second single-layer coil of the phase is connected, and finally the head end of the second single-layer coil of the phase is connected to the tail end of the first single-layer coil of the phase to form the phase winding; at this time, the The first end of the first double-layer coil of a phase constitutes the first end of the phase winding, and the first end of the second single-layer coil of the phase constitutes the tail end of the phase winding. Connect the three tail ends of the three-phase winding to form a Y-shaped star contact N, and obtain a Y-connected three-phase symmetrical winding; when the three-phase permanent magnet synchronous motor is running, the three first ends of the three-phase winding are connected to its power supply. After all connections are completed, the phase winding obtained is a parallel branch. Each phase winding is connected in series with two double-layer coils and then with two single-layer coils in series. It is a single-double-layer hybrid chain winding of a 4-pole 18-slot three-phase permanent magnet synchronous motor. The expanded view is shown in Figure 9.

Although the present invention has been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only illustrative and not restrictive. Those of ordinary skill in the art will not Under the inspiration of the invention, many modifications can be made without departing from the spirit of the invention, such as the coil connection sequence, which all fall within the protection of the invention.

Claims (1)

1. A 4-pole 18-slot three-phase permanent magnet synchronous motor with single and double-layer hybrid chain windings, which is characterized by: Each phase winding is composed of 2 double-layer coils and 2 single-layer coils. The number of turns of the double-layer coil is half of the number of turns of the single-layer coil. The span of each double-layer coil is 3 slots. The span of each single-layer coil is The distance is 4 slots. The three-phase stator winding has a total of 6 double-layer coils and 6 single-layer coils, with a total of 24 coil sides. The distribution order of the coil sides embedded in the 18 stator slots is: only one single-layer coil side is embedded in each of the two adjacent slots, and these two single-layer coil sides belong to different phases, and the subsequent one Two double-layer coil sides belonging to different phase windings are embedded in the lower and upper layers of the slot respectively; then, only one single-layer coil side is embedded in the two adjacent slots, and these two single-layer coils The edges belong to different phases, and two double-layer coil edges belonging to different phase windings are embedded in the lower and upper layers of the subsequent slot. In this way, a total of 6 cycles are performed, and 6 of the three-phase windings are embedded in the 18 slots. 2 double layer coils and 6 single layer coils on all 24 coil sides. The order in which the two double-layer coils and two single-layer coils of each phase winding are arranged in the stator core space is: the first double-layer coil of this phase, the first single-layer coil of this phase, and the first single-layer coil of this phase. The 2nd double layer coil and the 2nd single layer coil of this phase. The spatial distribution characteristics of the 8 coil sides of the 18 stator slots on the stator core in which the 4 coils of each phase are embedded are as follows: the slot of the tail end coil side of the first double-layer coil of each phase is different from the slot. The slots where the coil sides at the first end of the first single-layer coil of the phase are located are adjacent, and the current directions in the two coil sides are consistent; the slots where the tail coil sides of the first single-layer coil of the phase are located are the same as those of the phase. The slots where the coil side of the first end of the second double-layer coil is located are adjacent, and the current directions in the two coil sides are consistent, and the current direction has changed; the slot of the tail coil side of the second double-layer coil of this phase is located It is adjacent to the slot where the coil side of the first end of the second single-layer coil of this phase is located, and the current directions in these two coil sides are consistent, and the current direction changes again; the tail end of the second single-layer coil of this phase The slot where the coil side is located is adjacent to the slot where the coil side of the first double-layer coil of this phase is located, and the current directions in these two coil sides are consistent, and the current direction changes at the same time; 4 of each phase The coils are arranged together on the stator core like a "chain" connected by a "small ring" and a "large ring", which is called a single-double-layer hybrid chain winding. The coil sides of the UVW three-phase winding of the three-phase permanent magnet synchronous motor are embedded in the 18 slots in the order of distribution: in the first slot, only the tail end coil side of the second single-layer coil of the U phase is embedded; in the second slot, The lower layer is embedded with the first end coil side of the first double-layer coil of U phase, and the upper layer is embedded with the tail end coil side of the second double-layer coil of W phase; in the third slot, only the first end of the second single-layer coil of W phase is embedded. Coil side; in the 4th slot, only the tail end coil side of the second single-layer coil of V phase is embedded; in the 5th slot, the first end coil side of the V-phase first double-layer coil is embedded in the lower layer, and the U phase is embedded in the upper layer. The tail end coil side of the first double-layer coil; in slot 6, only the first end coil side of the first single-layer coil of U phase is embedded; in the seventh slot, only the tail end of the second single-layer coil of W phase is embedded Coil side; in the 8th slot, the lower layer is embedded with the first end coil side of the W-phase first double-layer coil, and the upper layer is embedded with the V-phase first double-layer coil with the tail end coil side; in the 9th slot, only the V-phase is embedded The first end coil side of the first single-layer coil; in the 10th slot, only the tail end coil side of the U-phase first single-layer coil is embedded; in the 11th slot, the lower layer is embedded with the first end of the U-phase second double-layer coil On the coil side, the upper layer is embedded with the tail end coil side of the first double-layer coil of W phase; in the 12th slot, only the first end coil side of the W-phase first single-layer coil is embedded; in the 13th slot, only the V phase is embedded The tail end coil side of the second single-layer coil; in the 14th slot, the first end coil side of the V-phase second double-layer coil is embedded in the lower layer, and the tail end coil side of the U-phase second double-layer coil is embedded in the upper layer; the 15th In the slot, only the first end coil side of the second single-layer coil of U phase is embedded; in the 16th slot, only the tail end coil side of the first single-layer coil of W phase is embedded; in the 17th slot, the W phase is embedded in the lower layer. The first-end coil side of the second double-layer coil is embedded in the upper layer, and the tail-end coil side of the second V-phase double-layer coil is embedded in the upper layer; in the 18th slot, only the first-end coil side of the second V-phase single-layer coil is embedded. There are many ways to connect two double-layer coils and two single-layer coils of each phase winding to form a phase winding. There are three typical phase winding connection methods. Phase winding connection method 1: Connect the end of the first double-layer coil of each phase to the end of the first single-layer coil of the phase to form the first phase winding branch of the phase; the second phase of each phase The tail end of a double-layer coil is connected to the tail end of the second single-layer coil of the phase to form the second phase winding branch of the phase. Connect the two phase winding branches of each phase in series, that is, the first end of the first single-layer coil of the phase is connected to the first end of the second double-layer coil of the phase, and the number of parallel branches of the phase is 1 A phase winding; at this time, the first end of the first single-layer coil of this phase constitutes the first end of the phase winding, and the first end of the second single-layer coil of this phase is the tail end of the phase winding. Connect the three tail ends of the three-phase winding to form a Y-shaped star contact N, and obtain a Y-connected three-phase symmetrical winding; when the three-phase permanent magnet synchronous motor is running, the three first ends of the three-phase winding are connected to its power supply. Phase winding connection method 2: Connect the end of the first double-layer coil of each phase to the end of the first single-layer coil of the phase to form the first phase winding branch of the phase; the second phase of each phase The tail end of a double-layer coil is connected to the tail end of the second single-layer coil of the phase to form the second phase winding branch of the phase. Connect the two phase winding branches of each phase in parallel to obtain a one-phase winding with a number of parallel branches of 2 for that phase. Connect the three tail ends of the three branches of the three-phase winding arranged in the front half of the stator to form a Y-shaped star contact N1, and then connect the three tail ends of the three branches of the three-phase winding arranged in the front half of the stator. The ends are connected to form a Y-shaped star contact N2, and a three-phase symmetrical winding with a double Y connected to two parallel branches is obtained; the first ends of the two parallel branches of the three-phase windings are connected together as the first end of the three-phase winding winding. When the three-phase permanent magnet synchronous motor is running, the three first ends of the three-phase windings are connected to its power supply. Phase winding connection method three: first connect the tail end of the first double-layer coil of each phase to the first end of the second double-layer coil of that phase, and then connect the tail end of the second double-layer coil of that phase to the first end of the second double-layer coil of that phase. The tail end of the second single-layer coil of the phase is connected, and finally the head end of the second single-layer coil of the phase is connected to the tail end of the first single-layer coil of the phase to form the phase winding; at this time, the The first end of the first double-layer coil of a phase constitutes the first end of the phase winding, and the first end of the second single-layer coil of the phase constitutes the tail end of the phase winding. Connect the three tail ends of the three-phase winding to form a Y-shaped star contact N, and obtain a Y-connected three-phase symmetrical winding; when the three-phase permanent magnet synchronous motor is running, the three first ends of the three-phase winding are connected to its power supply.