Traction motor stator

Abstract

The traction motor stator includes a frame, a stator core installed in the frame, a stator winding nested on the stator core, and a junction box installed on the frame. It is characterized in that: the connection structure at the end of the stator winding is a double-row structure arranged axially outside the frame, including an inner-row connection structure fixed to the coil nose of the stator winding and an outer-row connection structure arranged in parallel outside the inner-row connection structure. The outer-row connection structure is fixedly connected in parallel with the stator windings of different phases. In the present invention, the connection structure at the end of the stator winding is a double-row structure arranged axially outside the frame, with a compact structure, making full use of the axial and radial spaces, reducing the end volume of the traction motor stator, decreasing the space occupancy rate during the installation of the traction motor stator, improving the installation convenience of the traction motor stator, meeting the lightweight requirement, the coil nose protruding from the retaining ring, facilitating the connection operation of the connection structure at the end of the stator winding, and improving the assembly and forming efficiency of the stator.

Description

Technical Field

[0001] The present invention relates to a stator of a radial traction motor and belongs to the technical field of traction motors. Background Art

[0002] With the rapid development of rail transit, traction motors are also developing towards the directions of compactness, light weight, and high quality. Compactness requires the maximum power of the traction motor to be achieved within the limited installation space under the vehicle, which necessarily requires the minimum space occupied by the peripheral components (such as junction boxes) of the motor; light weight requires that the motor structure use as little material as possible or use light materials while meeting the strength requirements; high quality requires good processability, safety, reliability, and low cost.

[0003] The existing motor frames mostly adopt a hot sleeve structure, and the retaining rings mostly adopt a casting long retaining ring structure with a complex structure, which has high cost, large weight, and long manufacturing cycle, and the operation space for wire embedding and jointing is small. The joint bending is at the nose of the coil, and the connection wires are suspended at the end of the coil, occupying a large axial and radial space. The junction boxes mostly adopt a cuboid form, occupying a large space. The inside of the junction boxes mostly adopts a structure with connection seats. Summary of the Invention

[0004] In the stator of the traction motor provided by the present invention, the connection structure of the end of the stator winding is a double-row structure arranged axially outside the frame, with a compact structure, making full use of the axial and radial spaces, reducing the end volume of the stator of the traction motor, reducing the space occupancy rate during the installation of the stator of the traction motor, improving the installation convenience of the stator of the traction motor, meeting the lightweight requirement, the nose of the coil protrudes from the retaining ring, facilitating the connection operation of the connection structure of the end of the stator winding, and improving the assembly and forming efficiency of the stator.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A stator of a traction motor, comprising a frame, a stator core installed in the frame, a stator winding nested on the stator core, and a junction box installed on the frame, characterized in that: the connection structure of the end of the stator winding is a double-row structure arranged axially outside the frame, including an inner-row connection structure fixed to the nose of the coil of the stator winding and an outer-row connection structure arranged in parallel outside the inner-row connection structure, and the outer-row connection structure is fixedly connected to the phase-to-phase connection joint of the stator winding.

[0007] Preferably, the inner-row connection structure includes a U connection wire, a V connection wire, a W connection wire, and a first inter-phase pole connection wire of each phase of the stator winding close to the nose of the coil. The U connection wire, the V connection wire, and the W connection wire are respectively connected to the outgoing wires of the stator winding body and are close to the nose of the coil. The U connection wire, the V connection wire, the W connection wire, and the first inter-phase pole connection wire of each phase of the stator winding are arranged radially from the outside to the inside and are tied and fixed to the nose of the coil.

[0008] Preferably, the outer row connection structure includes the inter-phase connections II of each phase of the stator winding arranged on the side of the inner row connection structure away from the coil nose and the neutral ring connecting the ends of the stator winding. The inter-phase connections II of each phase of the stator winding, the neutral ring connecting the ends of the stator winding, and the phase-interconnection joint are arranged radially from the outside to the inside and are tied and fixed.

[0009] Preferably, the phase-interconnection joint is arranged axially along the outer edge of the coil nose without bending.

[0010] Preferably, the inner row connection structure is located radially outside the phase-interconnection joint.

[0011] Preferably, the number of the inter-phase connections II of each phase of the stator winding is multiple and they are arranged radially from the outside to the inside.

[0012] Preferably, the machine base includes a stay plate and a retaining ring. Multiple stay plates are welded in sequence to form the outer wall of the machine base. The retaining ring is connected to both ends of the stay plate to form the end of the machine base. The coil nose protrudes from the retaining ring.

[0013] Preferably, the junction box includes a junction box body fixed on the machine base and an external connection arranged in the junction box body and connected to the stator winding. The number of the external connections is three and they are distributed in a triangular position in the junction box body. The junction box body is in the shape of a triangular prism adapted to the distribution of the three external connections.

[0014] Preferably, the external connection includes a lead wire connected to the stator winding, a terminal nose I welded to the lead wire, a terminal nose II connected to the terminal nose I by a bolt, and a cable wire crimped to the terminal nose II.

[0015] Preferably, a window is opened on the junction box body. The window corresponds to the positions of the terminal nose I and the terminal nose II, and the window is closed with an insulating board. The insulating board is fixed to the junction box body by screws.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. In the stator of the traction motor of the present invention, the connection structure of the ends of the stator winding is a double-row structure arranged axially outside the machine base. The structure is compact, making full use of the axial and radial spaces, reducing the end volume of the stator of the traction motor, reducing the space occupancy rate during the installation of the stator of the traction motor, and improving the installation convenience of the stator of the traction motor.

[0018] 2. The phase-interconnection joint is arranged axially along the outer edge of the coil nose without bending, further reducing the end volume of the stator winding and improving the utilization rate of the axial and radial spaces.

[0019] 3. Multiple pull plates in the frame are welded in sequence to form the outer wall of the frame, which is light in weight and can meet the lightweight requirement. The coil nose protrudes from the retaining ring, facilitating the connection operation of the connection structure at the end of the stator winding and improving the assembly and forming efficiency of the stator.

[0020] 4. The junction box body is in the shape of a triangular prism adapted to the distribution of three external wires, with a compact structure, small volume, reducing the space occupancy rate. The window on the junction box body is closed with an insulating board, which is insulated, waterproof and highly safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the stator of the traction motor of the present invention.

[0022] Figure 2 It is a partial enlarged view of the stator of the traction motor.

[0023] Figure 3 It is a side screenshot of the connection structure at the end of the stator winding.

[0024] Figure 4 It is a schematic structural diagram of the frame.

[0025] Figure 5 It is a schematic diagram of the junction box installed on the frame without the insulating board.

[0026] Figure 6 It is a schematic diagram of the junction box body.

[0027] Figure 7 It is a schematic diagram of the external wire. DETAILED DESCRIPTION OF THE INVENTION

[0028] The following Figures 1 to 7 will describe the embodiments of the present invention in detail.

[0029] The stator of the traction motor includes a frame 1, a stator core installed in the frame 1, a stator winding 2 nested on the stator core, and a junction box 5 installed on the frame 1. It is characterized in that: the connection structure at the end of the stator winding 2 is in a double-row structure arranged axially outside the frame, including an inner-row connection structure 3 fixed to the coil nose 21 of the stator winding 2 and an outer-row connection structure 4 arranged in parallel outside the inner-row connection structure 3. The outer-row connection structure 4 is fixed to the phase-interphase connection and joint 22 of the stator winding 2.

[0030] In the above-mentioned stator of the traction motor, the connection structure at the end of the stator winding 2 is in a double-row structure arranged axially outside the frame, with a compact structure, making full use of the axial and radial spaces, reducing the end volume of the stator of the traction motor, reducing the space occupancy rate during the installation of the stator of the traction motor, and improving the installation convenience of the stator of the traction motor.

[0031] Among them, the inner column connection structure 3 includes a U connection 31, a V connection 32, a W connection 33, and a phase pole - to - pole connection one 34 of the stator winding close to the coil nose 21. The U connection 31, the V connection 32, and the W connection 33 are respectively connected to the outgoing lines of the stator winding 2 body and are close to the coil nose 21. The U connection 31, the V connection 32, the W connection 33, and the phase pole - to - pole connection one 34 of the stator winding are arranged radially from outside to inside and are tied and fixed to the coil nose 21. Tying and fixing the connections close to the coil nose 21 and the phase pole - to - pole connections of the stator winding together can prevent the connections from hanging at the coil end, occupying axial and radial spaces, regularizing and fixing the connections close to the coil nose 21, reducing the space occupancy rate, making the connection structure at the end of the stator winding 2 more regular and orderly, and occupying less space.

[0032] Among them, the outer column connection structure 4 includes a phase pole - to - pole connection two 41 of the stator winding arranged on the side of the inner column connection structure 3 far from the coil nose 21 and a neutral ring 42 connecting the ends of the stator winding. The phase pole - to - pole connection two 41 of the stator winding, the neutral ring 42 connecting the ends of the stator winding, and the phase - to - phase connection joint 22 are arranged radially from outside to inside and are tied and fixed. Fixing the phase pole - to - pole connection one 34 and the neutral ring 42 of the stator winding far from the coil nose 21 to the phase - to - phase connection joint 22 can prevent the connections from hanging at the coil end, occupying axial and radial spaces, regularizing and fixing the pole - to - pole connections and the neutral ring far from the coil nose 21, reducing the space occupancy rate, making the connection structure at the end of the stator winding 2 more regular and orderly, and occupying less space.

[0033] Among them, the phase - to - phase connection joint 22 is arranged axially outside the coil nose 21 without bending. Further reducing the volume of the end of the stator winding and improving the utilization rate of axial and radial spaces.

[0034] Among them, the inner column connection structure 3 is located radially outside the phase - to - phase connection joint 22. As Figure 3 shown, the phase - to - phase connection joint 22 is arranged at the innermost, playing a certain supporting role and improving the structural stability of the connection structure at the end of the stator winding 2.

[0035] Among them, the number of the phase pole - to - pole connection two 41 of the stator winding is multiple, and they are arranged radially from outside to inside. Enabling multiple phase pole - to - pole connection two 41 of the stator winding to be fixed orderly.

[0036] Among them, the described machine base 1 includes a pull plate 11 and a retaining ring 12. A plurality of pull plates 11 are welded in sequence to form the outer wall of the machine base 1. The retaining ring 12 is connected to both ends of the pull plate 11 to form the end of the machine base 1. The coil nose 21 protrudes from the retaining ring 12. The pull plates 11 are welded in sequence, which is lighter in weight and meets the lightweight requirement of the machine base 1. The coil nose 21 protrudes from the retaining ring 12, increasing the forming operation space of the connection structure at the end of the stator winding, facilitating the quick connection and forming of the connection structure at the end of the stator winding, and improving the assembly and forming efficiency of the stator.

[0037] Among them, the described junction box 5 includes a junction box body 51 fixed on the machine base 1 and an external connection wire 52 arranged in the junction box body 51 and connected to the stator winding 2. The number of external connection wires 52 is three and they are distributed in a triangular position in the junction box body 51. The junction box body 51 is in the shape of a triangular prism adapted to the distribution of the three external connection wires 52, reducing the space occupancy rate and improving the space utilization rate.

[0038] Among them, the described external connection wire 52 includes a lead wire 52.1 connected to the stator winding 2, a first wire nose 52.2 welded to the lead wire 52.1, a second wire nose 52.3 bolt-connected to the first wire nose 52.2, and a cable wire 52.4 crimped to the second wire nose 52.3. The connection seat structure between the first wire nose 52.2 and the second wire nose 52.3 is omitted and they are directly bolt-connected, further reducing the space occupancy rate.

[0039] Among them, a window 51.1 is opened on the junction box body 51. The window 51.1 corresponds to the positions of the first wire nose 52.2 and the second wire nose 52.3, and the window 51.1 is closed with an insulating plate 53. The insulating plate 53 is fixed to the junction box body 51 by screws. The insulating plate 53 closes the junction box body 51, forming a sealed space inside the junction box body 51, ensuring the insulation and dust and waterproof effects, and improving the use safety of the external connection wire 52.

[0040] The technical solutions of the embodiments of the present invention are completely described above in conjunction with the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

Claims

1. The traction motor stator includes a frame (1), a stator core installed in the frame (1), a stator winding (2) nested on the stator core, and a terminal box (5) installed on the frame (1). It is characterized in that: The connection structure of the ends of the stator winding (2) is a double-row structure arranged axially outside the frame (1), including an inner-row connection structure (3) fixed to the coil nose (21) of the stator winding (2) and an outer-row connection structure (4) arranged in parallel on the outside of the inner-row connection structure (3). The outer-row connection structure (4) is fixed to the phase-interconnection joint (22) of the stator winding (2). The inner-row connection structure (3) includes a U connection (31), a V connection (32), a W connection (33), and a first inter-phase pole connection (34) of each phase of the stator winding close to the coil nose (21). The U connection (31), the V connection (32), and the W connection (33) are respectively connected to the outgoing lines of the stator winding (2) itself and are close to the coil nose (21). The U connection (31), the V connection (32), the W connection (33), and the first inter-phase pole connection (34) of each phase of the stator winding are arranged radially from outside to inside and are tied and fixed to the coil nose (21). The outer-row connection structure (4) includes a second inter-phase pole connection (41) of each phase of the stator winding arranged on the side of the inner-row connection structure (3) away from the coil nose (21) and a neutral ring (42) connecting the ends of the stator winding (2). The second inter-phase pole connection (41) of each phase of the stator winding, the neutral ring (42) connecting the ends of the stator winding (2), and the phase-interconnection joint (22) are arranged radially from outside to inside and are tied and fixed. The inner-row connection structure (3) is located radially outside the phase-interconnection joint (22). The number of the second inter-phase pole connections (41) of each phase of the stator winding is multiple and is arranged radially from outside to inside.

2. The traction motor stator according to claim 1, It is characterized in that: The phase-interconnection joint (22) is arranged axially outside the coil nose (21) without bending.

3. The traction motor stator according to claim 1, It is characterized in that: The frame (1) includes a stay plate (11) and a retaining ring (12). A plurality of stay plates (11) are welded in sequence to form the outer wall of the frame (1). The retaining ring (12) is connected to both ends of the stay plate (11) to form the end of the frame (1). The coil nose (21) protrudes from the retaining ring (12).

4. The traction motor stator according to claim 1, It is characterized in that: The terminal box (5) includes a terminal box body (51) fixed on the frame (1) and an external connection wire (52) arranged in the terminal box body (51) and connected to the stator winding (2). The number of the external connection wires (52) is three and they are distributed in a triangular position in the terminal box body (51). The terminal box body (51) is in the shape of a triangular prism adapted to the distribution of the three external connection wires (52).

5. The traction motor stator according to claim 4, It is characterized in that: The external connection wire (52) includes a lead wire (52.1) connected to the stator winding (2), a first wire nose (52.2) welded to the lead wire (52.1), a second wire nose (52.3) bolted to the first wire nose (52.2), and a cable wire (52.4) crimped to the second wire nose (52.3).

6. The stator of the traction motor according to claim 5, wherein: a window (51.1) is formed on the junction box body (51), the position of the window (51.1) corresponds to that of the first wire nose (52.2) and the second wire nose (52.3), and the window (51.1) is closed by an insulating plate (53), and the insulating plate (53) is fixed to the junction box body (51) by screws.

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