TWI784745B - Rotary motor stator assembly - Google Patents

Abstract

A stator assembly of a rotating electric motor includes a stator iron core and a stator coil. The stator core includes a plurality of first stator slots, and each of the first stator slots has an open end facing the rotor and a bottom away from the rotor. The stator coils are embedded in each of the first stator slots, the stator coils include a primary coil winding capable of outputting a first power, and an auxiliary coil winding capable of outputting a second power, the second power system less than the first power. The distance between the position where the primary coil winding is arranged and the opening end of the stator slot is smaller than the distance between the position where the secondary coil winding is arranged and the opening end of the stator slot. In this way, the magnetic resistance of the magnetic circuit formed by the main coil winding can be effectively reduced.

Description

Rotary motor stator assembly

This invention relates to rotating electric machines, and more particularly to a rotating electric machine stator assembly.

According to the U.S. No. 10,992,248 patent case, a variable-speed AC motor device is provided. The coil unit of the AC motor device includes two coil windings wound on the stator unit. The number of poles wound by each coil winding is different, and then a The switching unit is used to switch and select the first coil or the second coil to make the motor have different rotational speeds. When this patent is laying out the position of each of the coil windings, one of the embodiments, as shown in Fig. 2 and Fig. 8, discloses a design in which each of the coil windings is embedded in the same stator slot. However, this patent does not describe how to arrange the positions of the coil windings in the same stator slot.

In addition, a compressor motor is provided in the patent case with publication number WO 2018/033130, which discloses a structure in which a main winding and a secondary winding are embedded in the same stator slot of the stator core. Usually in the case of compressor motors, the so-called primary winding is a running or actuating winding, and the so-called secondary winding is a starting winding. In the arrangement of each winding in this patent, as shown in Fig. 4 and Fig. 5 of this patent, the main winding (321) is arranged at a position far away from the opening of the stator slot (312). The disadvantage of this design is that it will increase the reluctance of the magnetic circuit of the main winding (321), in other words, when the compressor motor is in normal operation, it will consume more energy.

The main object of the present invention is to provide an improved stator assembly for a rotating electric motor, which can not only improve the efficiency of the electric motor, but also save the consumption of electric energy.

The stator assembly of the rotary electric machine provided by the present invention is arranged around the rotor of the rotary electric machine, and the stator assembly includes a stator core and a stator coil. The stator core includes an outer peripheral surface, a through hole, an inner peripheral surface defined by the through hole, a plurality of first stator slots extending along the inner peripheral surface toward the outer peripheral surface and distributed at intervals, and a plurality of two The first stator teeth defined by the first stator slots. The through hole is used for the rotor of the rotary motor to pass through, and each of the first stator slots has an open end facing the rotor, a bottom close to the outer peripheral surface, and a second slot between the open end and the bottom. one depth. The stator coil is embedded in each of the first stator slots, and includes a main coil winding and a first secondary coil winding. The primary coil winding includes at least one first primary coil capable of outputting a first primary power, and the first secondary coil winding includes at least one first secondary coil capable of outputting a first secondary power. The first main power is greater than the first auxiliary power, the first auxiliary coil is connected in parallel with the first main coil, and both have a first number of magnetic poles. Each of the first stator slots includes a first portion and a second portion, the first portion has a first center position, the second portion has a second center position, the first center position is connected to the first stator slot The distance from the opening end is smaller than the distance from the second central position to the opening end of the first stator slot; and the primary coil winding is embedded in the first part, and the first secondary coil winding is embedded in the second part. In this way, the magnetic resistance on the magnetic circuit of the main coil winding can be effectively reduced.

Another concept of the rotating motor stator assembly provided by the present invention is that the main coil winding further includes a second main coil capable of outputting a second main power, and the first secondary coil winding includes a second secondary coil capable of outputting a second auxiliary power the second secondary coil; both the second primary coil and the second secondary coil have a second number of magnetic poles, and the second secondary power is smaller than the second primary power. In more detail, the main coil windings and the secondary coil windings arranged in the same stator slot can each have more than one set of poles that are paired with each other. The primary coil and the secondary coil, thus, the rotating motor stator assembly will have different rotational speeds and output powers.

Another concept of the stator assembly of the rotary electric machine provided by the present invention is that the coil outer diameter of the main coil winding is larger than the coil outer diameter of the secondary coil winding. In this way, the number of frames of the main coil wound on the stator core can be reduced.

10: Rotary motor stator assembly

102: power supply

104: Toggle switch unit

106: setting condition device

20: Stator core

21: Outer peripheral surface

22: Through hole

23: inner peripheral surface

25: The first stator slot

250: Open end

252: bottom

254:Part One

256: Part Two

258: Part Three

26: The first stator tooth

27: Second stator slot

40: Stator coil

42: Main coil winding

420: The first main coil

4200: R phase first main coil

4202: S phase first main coil

4204: T-phase first main coil

422: Second main coil

4220: R phase second main coil

4222: S phase second main coil

4224: T phase second main coil

44: The first secondary coil winding

440: The first secondary coil

4400: R phase first secondary coil

4402: S-phase first secondary coil

4404: T-phase first secondary coil

442: Second secondary coil

4420: R phase second secondary coil

4422: Second secondary coil of S phase

4424: T phase second secondary coil

46:Second secondary coil winding

48: The third secondary coil winding

90: rotor

d ₀ : first depth

d ₁ : second depth

d ₂ : third depth

d ₃ : fourth depth

d ₄ : fifth depth

H ₁ : first center position

H ₂ : Second center position

H ₃ : third center position

The following is a further description of the rotating motor stator assembly provided by the present invention with examples and drawings, wherein: Fig. 1 is a perspective view of the first embodiment of the rotating motor stator assembly of the present invention; Figure 3 is a sectional view along the direction 3-3 of Figure 2; Figure 4 is a schematic diagram of the winding of the stator coil of the embodiment shown in Figure 1; Figure 5 is a part A shown in Figure 3 Figure 6 is a schematic diagram of the power connection of the embodiment shown in Figure 1; Figure 7 is a schematic diagram of the stator coil circuit of the embodiment shown in Figure 1; Wiring schematic diagram; Fig. 9 is a schematic diagram of the stator coil circuit of the embodiment shown in Fig. 8; Fig. 10 is a cross-sectional view of the stator core of the third embodiment of the stator assembly of the rotating electric motor of the present invention in the same direction as Fig. 3; and Fig. 11 is the present invention The cross-sectional view of the stator core of the fourth embodiment of the stator assembly of the rotary electric machine according to the invention is in the same direction as that in Fig. 3 .

Please refer to Fig. 1 to Fig. 7 at first, the first embodiment of the stator assembly of the electric rotating machine of the present invention is shown as the indication number 10, and what this stator assembly 10 cooperates is a three-phase, four-pole, thirty-six slots, rated output power 2HP induction motor. It must be mentioned here that since the present invention is related to the stator, other related structures of the induction motor will not be described in detail here. As shown in FIG. 1 , the stator assembly 10 has a stator core 20 and a stator coil 40 . As shown in FIGS. 2 to 4 , the stator core 20 in this embodiment is formed by stacking a plurality of annular silicon steel sheets. The stator core 20 has an outer peripheral surface 21, a through hole 22, an inner peripheral surface 23 bounded by the through hole 22, thirty-six first stator slots 25 and two adjacent first stator slots 25 bounded by the first stator teeth 26 . The through hole 22 is used for the rotor 90 of the rotary motor to pass through. Each of the first stator slots 25 extends along the inner peripheral surface 24 toward the outer peripheral surface 21 and is equally spaced. As shown in Figure 5, each of the first stator slots 25 has an open end 250 facing the rotor 90, a bottom 252 close to the outer peripheral surface, and a second end defined by the open end 250 and the bottom 252. a depth d ₀ .

Please refer to FIG. 6 and FIG. 7 , the stator coil 40 is wound on each of the first stator teeth 26 and embedded in each of the first stator slots 25 . The stator coil 40 includes a primary coil winding 42 and a first secondary coil winding 44 . In this embodiment, the primary coil winding 42 includes a first primary coil 420 capable of outputting a first primary power, and the first secondary coil winding 44 includes at least one first secondary coil 440 capable of outputting a first secondary power , the first main power is greater than the first auxiliary power. The first primary coil 420 is connected in parallel with the first section of secondary coil 440 , and both form four magnetic poles.

In more detail, as shown in FIG. 7, in this embodiment, the first main coil 420 includes an R-phase first main coil 4200, an S-phase first main coil 4202, and a T phase first main coil 4204 . The first secondary coil 440 includes an R-phase first secondary coil 4400 , an S-phase first secondary coil 4402 , and a T-phase first secondary coil 4404 connected in a Y shape. A switch S ₁ is arranged in the circuit between each of the secondary coils and the three-phase power supply. In addition, the outer diameter of the first main coil 420 is about 0.9mm, the number of frames is 50, and the rated output power (ie the aforementioned first main power) is 2HP. The outer diameter of the coil of the first secondary coil 440 is 0.55 mm, the number of frames is 95, and the rated output power (that is, the aforementioned first secondary power) is 0.5 HP. The winding pole pitches of the first primary coil 420 and the first secondary coil 440 are both 9. In addition, the first primary coil 420 and a first secondary coil 440 are respectively embedded in the stator slot 25 . The position of the first main coil 420 is closer to the opening end 250 of the stator slot 25 than the position of the first primary coil 440 . As shown in FIG. 5 , the stator slot 25 has the first depth d ₀ from the open end 250 to the bottom 252 . In this embodiment, the stator slot 25 is divided into a second depth d ₁ . A portion 254 and a second portion 256 having a third depth d ₂ , where d ₁ +d ₂ =d ₀ . Moreover, the first portion 254 is closer to the open end 250 , and the second portion 256 is closer to the bottom 252 , in other words, the first portion 254 is closer to the rotor 90 than the second portion 256 . In this embodiment, the first main coil 420 is disposed on the first portion 254 , and the first secondary coil 440 is disposed on the second portion 256 . More specifically, the distance between the first center position H ₁ of the first portion 254 and the opening end 250 is 1/2d ₁ , and the distance between the second center position H ₂ of the second portion 256 and the opening end 250 is 1 /2d ₂ +d ₁ , comparing the two values, we can see that 1/2d ₂ +d ₁ is certainly greater than 1/2d ₁ . That is to say, when the first main coil 420 is arranged in the first part 254 , the magnetic circuit formed in the stator core 20 is shorter than when it is arranged in the second part 256 . Therefore, according to the reluctance Rm=L/μA (where Rm is the reluctance, μ is the permeability coefficient, L is the length of the magnetic circuit, and A is the cross-sectional area of the magnetic circuit) and Φ=F/Rm (where Φ is the magnetic flux, F is Magnetomotive force) Two formulas show that the design of the present invention can reduce the reluctance, increase the magnetic flux and increase the magnetomotive force.

The induction motor 100 arranged with the stator assembly 10 is operated by a three-phase (RST) power supply 102 via a switching unit 104 and connected to the first main coil 420 with lines A, B, and C respectively, so as to Lines D, E, and F are connected to the first secondary coil 440 . The switch unit 104 automatically connects the three-phase power supply 102 to the first primary coil 420 and the first secondary coil 440 simultaneously when the induction motor starts. When the rated output torque is reached, the switching unit 104 turns off the switch S1 _. The three-phase power supply 100 is only connected to the first main coil 420, which is responsible for normal operation. According to the inventor's actual test, when the output voltage of the three-phase power supply 102 is 220V, the current consumed by the first main coil 420 is about 2.68A, and the output torque Ta is about 2.68NM. The current consumed by the first secondary coil 440 is about 1.10A, and the output torque Tb is about 1.10NM. In general, a conventional motor with 2HP, 4 poles, and 36 slots consumes 3.30A of current, and its output torque Tc is 3.30NM at start-up and normal operation. In comparison, when the induction motor 100 arranged with the stator assembly 10 operates normally, that is, when the output rated power is 2HP, the consumed current is about 2.68A, while the output rated power of the conventional motor is also 2HP , the current consumption needs to be 3.30A, and the output torque of the two is calculated by the following formula: (Tc-Ta)/Tc=(3.30-2.68)/3.3=18.78%. In other words, the induction motor with the stator assembly 10 can save about 18.78% of electric energy.

Please refer to FIG. 8 and FIG. 9 again. In another embodiment of the present invention, the main coil winding 42 includes a second main coil capable of outputting a second main power in addition to the first main coil 420. 422. In addition to the first secondary coil 440 , the first secondary coil winding 44 further includes a second secondary coil 442 capable of outputting a second secondary power. The second main coil 422 and the second auxiliary coil 442 are paired to form a second number of magnetic poles, such as eight magnetic poles or sixteen magnetic poles, and the second auxiliary power is smaller than the second main power. In more detail, in this embodiment, the second main coil 422 includes an R-phase second main coil 4220 , an S-phase second main coil 4222 , and a T-phase second main coil 4224 connected in a Y shape. . The second sub-coil 442 includes an R-phase second sub-coil 4420 , an S-phase second sub-coil 4422 , and a T-phase second sub-coil 4424 connected in a Y shape. The second main coil 422 is connected in parallel with the first main coil 420 . The second secondary coil 442 is also connected in parallel with the first secondary coil 440 . The three-phase (RST) power supply 102 is also connected to the second primary coil 422 via lines A1 , B1 , and C1 and connected to the second secondary coil 442 via lines D1 , E1 , and F1 via the switching unit 104 . When the first main coil 420 and the first secondary coil 440 are in operation, the switch S2 is turned _on , and the power supply of the _second main coil 422 and the second secondary coil 442 is cut off by the switch S3. When the second main coil 422 and the _second secondary coil 442 are in operation, the switch S3 is turned _on , and the power supply of the first primary coil 420 and the first secondary coil 440 is cut off by the switch S2. The opening and closing control of the above-mentioned switches can be achieved by a setting condition device 106 of the switching unit 104 .

The stator coils of the rotary motor stator assembly of the present invention are certainly not limited to two sets of coil windings. As shown in Figure 10, in the third embodiment of the rotary motor stator assembly of the present invention, each of the first stator slots 25 In addition to the primary coil winding 42 and the first secondary coil winding 44 embedded therein, a second secondary coil winding 46 is embedded therein. The second secondary coil winding 46 has a third secondary power smaller than the first power, and its layout position is further away from the open end of the first stator slot 25 than the position of the first secondary coil winding 44. 250. In more detail, in the third embodiment, the first stator slot 25 further has a third portion 258 in addition to the first portion 254 and the second portion 256 . The third portion 258 has a fourth depth d ₃ , and the sum of the second depth d ₁ , third depth d ₂ and fourth depth d ₃ is equal to the first depth d ₀ . The third portion 258 has a third center position H ₃ , the distance from the third center position H ₃ to the opening end 250 of the first stator slot 25 is greater than the distance from the second center position H ₂ to the first stator slot 25 The distance from the open end 250. That is to say, the first portion 254 is closer to the open end 250 than the second portion 256 and the third portion 258 , and the third portion 258 is closer to the bottom. The second secondary coil winding 46 is disposed on the third portion 258 .

As shown in FIG. 11 , in the fourth embodiment of the stator assembly of the electric rotating machine of the present invention, the stator core 20 has a plurality of second stator slots 27 in addition to the first stator slots 25 . Each of the second stator slots 27 has an open end 270 facing the rotor 90 , a bottom 272 close to the outer peripheral surface 21 , and a fifth depth d ₄ defined by the open end 270 and the bottom 272 . The fifth depth d ₄ is smaller than the first depth d ₀ of the first stator slot 25 . The stator coil 40 further includes a third secondary coil winding 48 . The third secondary coil winding 48 has a fourth secondary power which is lower than the first power. In this embodiment, the primary coil winding 42 and the first secondary coil winding 44 are respectively embedded in each of the first stator slots 25 . Each of the second stator slots 27 is respectively embedded with the third secondary coil winding 48 .

The above-mentioned ones are only some embodiments of the technical ideas provided by the present invention, and therefore the scope of patent application of the present invention cannot be limited by these contents. Therefore, simple changes or equivalent changes and modifications based on these contents should be covered by the patent scope of the present invention.

20: Stator core

21: Outer peripheral surface

22: Through hole

23: inner peripheral surface

25: The first stator slot

250: Open end

252: bottom

26: The first stator tooth

90: rotor

Claims (5)

A stator assembly of a rotating electric motor is arranged around the rotor of the rotating electric motor. The stator assembly includes: a stator core, including an outer peripheral surface, a through hole, and an inner peripheral surface defined by the through hole. The first stator slots extending from the inner peripheral surface to the outer peripheral surface and distributed at intervals, and a plurality of first stator teeth defined by the two first stator slots, the through hole is for the rotor of the rotary electric machine to pass through Each of the first stator slots has an open end facing the rotor, a bottom close to the outer peripheral surface and a first depth between the open end and the bottom; The stator coil in the stator slot, the stator coil includes a main coil winding and a first secondary coil winding; the main coil winding includes at least one first main coil capable of outputting a first main power, the first secondary The coil winding includes at least one first auxiliary coil capable of outputting a first auxiliary power, the first main power is greater than the first auxiliary power, the first auxiliary coil is connected in parallel with the first main coil, and both form A first number of magnetic poles; each of the first stator slots includes a first portion and a second portion, the first portion has a first center position and a second depth, the second portion has a second center position and a Third depth, the distance from the first center position to the opening end of the first stator slot is less than the distance from the second center position to the opening end of the first stator slot; and the main coil winding is embedded in the first portion , the first secondary coil winding is embedded in the second part. The rotating electric motor stator assembly as claimed in claim 1, wherein the main coil winding further includes Contains a second main coil that can output a second main power, the first secondary coil winding includes a second secondary coil that can output a second secondary power; the second main coil and the second secondary coil form a The number of magnetic poles is the second, and the second auxiliary power is smaller than the second main power. The rotating motor stator assembly as described in claim 1, wherein the stator coil further includes a second secondary coil winding capable of outputting a third secondary power; the second secondary coil winding, the first secondary coil group and the main The coil group forms the first number of poles, the third secondary power is smaller than the first power; the first stator slot further includes a third portion, the third portion has a third center position and a third depth, The distance from the third center position to the opening end of the first stator slot is greater than the distance from the second center position to the opening end of the first stator slot, and the second secondary coil winding is embedded in the third part. The stator assembly of a rotating electric machine as described in claim 1, the stator core further includes a plurality of second stator slots, each of the second stator slots has an open end facing the rotor and a bottom close to the outer peripheral surface , and a fifth depth defined by the open end and the bottom, the fifth depth is less than the first depth of the first stator slot; the stator coil further includes a third secondary coil winding, the third secondary The coil winding has a fourth secondary power smaller than the first power, and is embedded in each of the second stator slots. The stator assembly of any one of the preceding claims, wherein the coil outer diameter of the primary coil winding is larger than the coil outer diameter of the secondary coil winding.

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