Outer rotor traction machine

Abstract

The utility model belongs to the technical field of motors, in particular to an outer rotor traction machine, which comprises a shell, a stator assembly and a rotor assembly, and is characterized in that the rotor assembly comprises a magnetic steel mounting part and a magnetic steel sheet; the number P0 of the magnetic steel sheets is an even number greater than or equal to 72, and the inner diameter of the magnetic steel mounting part is greater than or equal to 450 mm; a plurality of stator teeth are arranged on the periphery of the stator assembly, winding grooves used for winding winding wires are formed between the adjacent stator teeth, and the number Q of the winding grooves is an odd number. Every two adjacent stator teeth adopt an n-layer to (n-1)-layer winding distribution structure, and n is a positive integer greater than or equal to 3; single-wire multi-layer winding is adopted, copper wires between the upper layer and the lower layer can be tightly combined, the heat transfer effect is improved, and internal temperature accumulation is avoided; the phenomenon of high temperature in the traction machine is avoided, and the hidden danger that the magnetic steel sheets are demagnetized due to high temperature is avoided. According to the utility model, a single-wire winding method with n and (n-1) layers spaced is adopted, so that the slot fullness rate is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of elevator equipment, in particular to an outer rotor traction machine. Background Art

[0002] The traction machine is the core driving component of the elevator. The traction wheel of the traction machine rotates to retract and release the rope hanging the car, thereby driving the car to move. The smoothness of its operation directly affects the safety of the elevator.

[0003] For example, an outer rotor traction machine disclosed in patent number CN202121777852.3 has a stator arranged on a machine base, a coil winding wound on the stator, a rotor rotatably mounted on the outer ring of the stator through a rotating shaft, and a magnet arranged on the rotor; when in use, the coil winding is energized and cooperates with the magnet to drive the rotor to rotate, and then the traction wheel for hanging ropes is installed on the rotor, and the rotation of the rotor drives the traction wheel to rotate to retract and release the rope of the car.

[0004] As an important component of elevator equipment, the traction machine is generally specified with corresponding external dimensions, traction ratio, etc. The motivation for the development of this patent is to make the traction machine have a stronger load-bearing capacity while keeping the cost similar. Summary of the invention

[0005] The utility model aims to provide an outer rotor traction machine with stronger load-bearing capacity.

[0006] The purpose of the utility model is achieved in this way:

[0007] An outer rotor traction machine comprises a housing, a stator assembly and a rotor assembly, wherein the rotor assembly comprises a magnetic steel mounting portion and magnetic steel sheets; the number of magnetic steel sheets is P 0 is an even number ≥72, the inner diameter of the magnetic steel mounting portion is ≥450mm; a plurality of stator teeth are arranged on the periphery of the stator assembly, winding slots for winding winding wires are formed between adjacent stator teeth, and the number of winding slots Q is an odd number; every two adjacent stator teeth adopt an n-layer-(n-1)-layer winding distribution structure, and n is a positive integer ≥3;

[0008] The winding layer of the stator tooth is obtained by winding a single winding wire, and an insulating layer is provided between the winding wire located in the innermost layer and the winding slot.

[0009] Preferably, the greatest common divisor of the number of winding slots Q and the number of rotor poles p is 0 =9; the stator assembly consists of 9 independent submodules; each submodule includes 3 winding units arranged in sequence, and the 3 winding units are respectively connected to the U phase, V phase and W phase of the current.

[0010] Preferably, the number of winding slots Q is 81; the number of magnetic steel sheets P is 0 is 90.

[0011] Preferably, the inner diameter of the magnetic steel mounting portion is 471 mm; the thickness of the magnetic steel sheet is 3.5±0.045 mm, and the width of the magnetic steel sheet is 16.22±0.04 mm; and the air gap between the magnetic steel sheet and the stator assembly is 1.00±0.02 mm.

[0012] Preferably, n=3 or n=4.

[0013] Preferably, in the winding layer on the same stator tooth, the number of winding turns of the copper wire in the lower layer is greater than the number of winding turns of the copper wire in the upper layer.

[0014] Preferably, the winding slot fill rate of the stator assembly is not less than 70%.

[0015] Preferably, the relationship between the slot width Bs0 of the winding slot and the wire diameter Da of the winding wire is: 2*Da≤Bs0≤2.5*Da; the second slot width Bs2 of the winding slot closest to the stator yoke is not greater than the first slot width Bs1 farthest from the stator yoke.

[0016] Preferably, the slot width of the winding slot is Bs0=3.4173 mm;

[0017] The second slot width of the winding slot closest to the stator yoke is Bs2 = 6.6106 mm;

[0018] The first slot width of the winding slot stator yoke is Bs1 = 9.3271 mm;

[0019] The stator teeth include tooth ends located at the ends and extending to both sides thereof, the depth Hs0 of the tooth ends is 0.9186 mm, the spacing Hs1 between the tooth ends and the corresponding stator teeth is 2.1055 mm; the effective depth Hs2 of the winding slots is 35.0192 mm.

[0020] Compared with the prior art, the utility model has the following outstanding and beneficial technical effects:

[0021] This patent increases the width of the stator teeth by changing the shape of the winding slots, and the effective magnetic flux of each stator tooth is expanded, thereby increasing the magnetic field strength of the rotor (i.e., rotor magnetic flux); the increased rotor magnetic field strength has no direct relationship with the input current and the coil excitation current. Under the same input current, the speed of the traction machine increases, the work done becomes greater (heavier load), and the efficiency is improved.

[0022] This patent reduces the thickness of the magnetic steel and expands the outer diameter of the stator core; while the area of ​​the winding slot remains basically unchanged, the length of the winding slot is increased and the width of the winding slot is reduced, so that the width of the stator teeth is increased, further improving the effective magnetic flux.

[0023] This patent adopts single-wire multi-layer winding, and the copper wires between the upper and lower layers can be tightly combined, which improves the heat transfer effect and avoids internal temperature accumulation; the phenomenon of high temperature inside the traction machine will not appear, and the hidden danger of high temperature demagnetization of the magnetic steel sheet is avoided.

[0024] This patent adopts a single-wire winding method with n and n-1 layers of spacing, so that the slot fill rate is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the coordination of the magnetic steel sheets and the stator assembly of this patent.

[0026] Figure 2 It is a schematic diagram of the stator assembly of this patent.

[0027] Figure 3 This is a partial enlarged view of the magnetic steel sheet and stator assembly of this patent.

[0028] Figure 4 It is a schematic diagram of the magnetic steel sheet of this patent.

[0029] Figure 5 It is a schematic diagram of the winding groove of this patent.

[0030] Figure 6 This is a schematic diagram of the three-phase winding expansion of this patent. DETAILED DESCRIPTION

[0031] The utility model is further described below in conjunction with specific embodiments:

[0032] An outer rotor traction machine includes a housing, a stator assembly 100 and a rotor assembly 200, wherein the rotor assembly includes a magnetic steel mounting portion 11 and magnetic steel sheets 12; the stator assembly includes a stator core 21, and a plurality of stator teeth 22 are arranged on the periphery of the stator core; the rotor assembly is sleeved on the outer periphery of the stator assembly; the number of magnetic steel sheets 12 is P 0 is an even number ≥72, the inner diameter of the magnetic steel mounting portion is ≥450mm; winding slots 24 for winding the winding wire are formed between adjacent stator teeth, and the number of winding slots Q is an odd number; every two adjacent stator teeth adopt an n-layer-(n-1)-layer winding distribution structure, and n is a positive integer ≥3; in this embodiment, a 2-layer-3-layer-2-layer winding distribution method is formed.

[0033] The winding layer of the stator teeth is obtained by winding a single winding wire 26, and an insulating layer 25 is provided between the innermost winding wire and the winding slot, and the insulating layer is an insulating paper padded in the winding slot. The winding wire 26 is a copper wire.

[0034] Preferably, the greatest common divisor of the number of winding slots Q and the number of rotor poles p is 0=9; the stator assembly consists of 9 independent submodules; each submodule includes 3 winding units arranged in sequence, and the 3 winding units are respectively connected to the U phase, V phase and W phase of the current.

[0035] Preferably, the number Q of the winding slots 24 is 81; the number P of the magnetic steel sheets is 0 is 90.

[0036] Preferably, the inner diameter of the magnetic steel mounting portion is 471 mm; the load of the traction machine is relatively stable, and no alternating or impact load occurs, so a thinner magnetic steel sheet is selected; the thickness d3 of the magnetic steel sheet is 3.5±0.045 mm, and the width d4 of the magnetic steel sheet is 16.22±0.04 mm; the air gap d5 between the magnetic steel sheet and the stator assembly is 1.00±0.02 mm.

[0037] Preferably, n=3 or n=4.

[0038] Preferably, in the winding layer on the same stator tooth, the number of copper wire winding turns in the lower layer is greater than the number of copper wire winding turns in the upper layer. The width d2 of the stator tooth and the thickness d1 of the stator tooth can be set according to actual conditions.

[0039] Preferably, the winding slot fill rate of the stator assembly is not less than 70%.

[0040] Preferably, the relationship between the slot width Bs0 of the winding slot and the wire diameter Da of the winding wire is: 2*Da≤Bs0≤2.5*Da; the second slot width Bs2 of the winding slot closest to the stator yoke is not greater than the first slot width Bs1 farthest from the stator yoke.

[0041] Preferably, the slot width of the winding slot is Bs0=3.4173 mm;

[0042] The second slot width of the winding slot closest to the stator yoke is Bs2 = 6.6106 mm;

[0043] The first slot width of the winding slot stator yoke is Bs1 = 9.3271 mm;

[0044] The stator tooth includes a tooth end portion 221 located at the end and extending to both sides thereof, the depth Hs0 of the tooth end portion is 0.9186 mm, the spacing Hs1 between the tooth end portion 221 and the corresponding stator tooth is 2.1055; the effective depth Hs2 of the winding slot is 35.0192 mm.

[0045] Preferably, the second slot width Bs2=A*Da+2*Ta+Tb; wherein A is the number of winding layers in the winding slot, Ta is the thickness of the insulating layer, and Tb is the spacing between winding layers in the same winding slot and wound on adjacent stator teeth.

[0046] The stator tooth includes a tooth end portion 221 located at the end and extending to both sides thereof, and the range of the tooth end portion Hs0 is 0.8-1.8 mm; the tooth end portion 221 and the corresponding stator tooth have a spacing Hs1, and the range of the spacing Hs1 is 0.2-1 mm; Z*Da≤Hs2≤Z*Da+0.5 mm; wherein Z is the effective winding turns of the first layer of winding on a single stator tooth; Hs2 is the effective depth of the winding slot; and Z is a positive integer ≥13.

[0047] Under the condition of constant output power, the more pole pairs the rotor has, the lower the rotor speed will be, but the greater its torque will be. For example, the frequency of three-phase AC power in China is 50Hz, so the synchronous speed of 2-pole is 3000r / min, the synchronous speed of 4-pole is 1500r / min, the synchronous speed of 6-pole is 1000r / min, and the synchronous speed of 8-pole is 750r / min (these speeds are only the synchronous speeds of motors with different pole numbers, not the actual speeds).

[0048] In this embodiment, the number of rotor pole pairs reaches 45 (the number of magnetic steel sheets divided by 2). When the output power remains unchanged, the rotation speed is low and the load capacity is significantly improved.

[0049] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An outer rotor traction machine, comprising a housing, a stator assembly and a rotor assembly, characterized in that: The rotor assembly includes a magnetic steel mounting portion and a magnetic steel sheet; the stator assembly includes a stator core, and a plurality of stator teeth are arranged on the periphery of the stator core; the rotor assembly is sleeved on the outer periphery of the stator assembly; Winding slots for winding winding wires are formed between adjacent stator teeth of the plurality of stator teeth, and the number of winding slots Q is an odd number; every two adjacent stator teeth adopt an n-layer-(n-1)-layer winding distribution structure, where n is a positive integer ≥3; The winding layer of the stator tooth is obtained by winding a single winding wire, and an insulating layer is provided between the winding wire located in the innermost layer and the winding slot.

2. An outer rotor traction machine according to claim 1, characterized in that: The number P0 of magnetic steel sheets of the rotor assembly is an even number ≥ 72, and the inner diameter of the magnetic steel mounting portion is ≥ 450 mm; The greatest common divisor t0 of the number of winding slots Q and the number of rotor poles p is 9; the stator assembly is composed of 9 independent submodules; each submodule includes 3 winding units arranged in sequence, and the 3 winding units are respectively connected to the U phase, V phase and W phase of the current.

3. An outer rotor traction machine according to claim 2, characterized in that: The number Q of the winding slots is 81; the number P0 of the magnetic steel sheets is 90.

4. The outer rotor traction machine according to claim 1, characterized in that: The inner diameter of the magnetic steel mounting portion is 471 mm; the thickness of the magnetic steel sheet is 3.5±0.045 mm, and the width of the magnetic steel sheet is 16.22±0.04 mm; the air gap between the magnetic steel sheet and the stator assembly is 1.00±0.02 mm.

5. The outer rotor traction machine according to claim 1, characterized in that: The n=3 or n=4.

6. The outer rotor traction machine according to claim 1, characterized in that: In the winding layer on the same stator tooth, the number of winding turns of the copper wire in the lower layer is greater than the number of winding turns of the copper wire in the upper layer.

7. The outer rotor traction machine according to claim 1, characterized in that: The winding slot fill rate of the stator assembly is not less than 70%.

8. The outer rotor traction machine according to claim 2, characterized in that: The relationship between the slot width Bs0 of the winding slot and the wire diameter Da of the winding wire is: 2*Da≤Bs0≤2.5*Da; the second slot width Bs2 of the winding slot closest to the stator yoke is not greater than the first slot width Bs1 farthest from the stator yoke.

9. An outer rotor traction machine according to claim 8, characterized in that: The slot width of the winding slot is Bs0=3.4173 mm; The second slot width of the winding slot closest to the stator yoke is Bs2 = 6.6106 mm; The first slot width of the winding slot stator yoke is Bs1 = 9.3271 mm; The stator tooth comprises a tooth end portion (221) located at the end and extending to both sides thereof, the depth Hs0 of the tooth end portion is 0.9186 mm, the spacing Hs1 between the tooth end portion (221) and the corresponding stator tooth is 2.1055, and the effective depth Hs2 of the winding slot is 35.0192 mm.

10. The outer rotor traction machine according to claim 8, characterized in that: The second slot width Bs2=A*Da+2*Ta+Tb; wherein A is the number of winding layers in the winding slot, Ta is the thickness of the insulating layer, and Tb is the spacing between winding layers in the same winding slot and wound on adjacent stator teeth.

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