JP2003276971A - Winch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a winch capable of eliminating the gearing mechanism while the torque can be made greater, reducing the cogging torque, and assuring easy manufacture. <P>SOLUTION: A first motor 39 and second motor 40 are arranged in line in the axial direction, thus enabling enlargement of the torque correspondingly to a motor which is constituted long in the axial direction. The motors 39 and 40 particularly long in the axial direction are unnecessary. With respect to a first rotor 50, a second rotor 54 is dislocated by a certain angle round the axis of a rotary shaft 38. This gives the same acting effect as that of the case where a skew is provided, and makes possible to reduce the cogging torque. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a hoisting machine used in an elevator system.

[0002]

FIG. 13 shows the structure of a conventional general elevator apparatus. In this FIG.
A machine room 2 is provided near the top of the guide rail 1, and a hoisting machine 3 is provided on a base 2 a provided in the machine room 2. The hoisting machine 3 includes an electric motor 4 and a sheave 6 that is rotated by the electric motor 4 via a gear mechanism 5. A plurality of ropes 7 are hung on the sheave 6, a car 8 is connected to one end of the rope 7, and a weight mounting portion 9 having a counterweight 9a is connected to the other end. Has been done. In this configuration, when the sheave 6 is rotated by the electric motor 4 via the gear mechanism 5, the car 8 and the weight mounting portion 9 are moved up and down along the guide rail 1 via the rope 7.

In the above-mentioned conventional structure, the gear mechanism 5 is required between the electric motor 4 and the sheave 6, so that the hoisting machine 3 becomes large and a large installation space is required. It was

On the other hand, in recent years, a hoisting machine used for such an elevator apparatus does not use a gear mechanism,
A so-called gearless system is considered. An example of such a hoisting machine is shown in FIG. The hoisting machine 11 roughly includes an electric motor 12, a sheave 13, and a braking device 14.
It consists of and. The electric motor 12 is, for example, a three-phase inversion type brushless motor, and has an elongated shape in which the axial length is longer than the diameter dimension in order to increase the rotational torque.

The stator 15 in the electric motor 12 is composed of a cylindrical stator core 17 fixed in a cylindrical frame 16 and a stator winding 18 mounted on the stator core 17. Has been done. A permanent magnet type rotor 19 including a permanent magnet is disposed in the central space of the stator core 17. A rotary shaft 20 is fixed to the center of the rotor 19 so as to rotate integrally, and both ends of the rotary shaft 20 in the axial direction are attached to the bearing brackets 21,
22 are rotatably supported by bearings 23. Here, each of the stator 15 and the rotor 19 has a long shape in which the length in the axial direction is longer than the diameter.

Then, one end of the rotary shaft 20 penetrates the left bearing bracket 21 and the sheave 13 is inserted therein.
Are attached so as to rotate integrally with the rotary shaft 20. The other end of the rotating shaft 20 penetrates the right bearing bracket 22, the brake device 14 is provided outside the bearing bracket 22, and the rotor 19 is provided outside the brake device 14. A speed / position detector 24 for detecting the rotation speed and the rotation position of the (rotary shaft 20) is provided.

In the hoisting machine 11 described above, the electric motor 1
By making 2 long in the axial direction, the rotational torque can be increased, and the gear mechanism can be eliminated. However, such a structure has a drawback that the cogging torque is large. In the elevator device, if the cogging torque is large, the riding comfort becomes poor.

Therefore, in order to reduce the cogging torque, it is conceivable to provide the stator core 17 or the rotor 19 with skew (twist). However, since the electric motor 12 is configured to be long in the axial direction, there is a problem that the number of steps for increasing the skew is increased and the cost is increased.

The present invention has been made in view of the above circumstances, and an object thereof is to increase the rotational torque, to eliminate the gear mechanism, to reduce the cogging torque, and to facilitate the manufacturability. There is a hoisting machine.

[0010]

In order to achieve the above object, the invention of claim 1 has a first stator and is a permanent member rotatably provided with respect to the first stator. A first electric motor having a magnet-type first rotor and an axially adjacent first electric motor having a second stator and rotating with respect to the second stator. A second electric motor having a second rotor of a permanent magnet type which is provided so as to be possible; and a rotary shaft provided so as to rotate integrally with the first rotor and the second rotor, A sheave provided so as to rotate integrally with the rotating shaft, wherein the second electric motor is displaced from the first electric motor by a predetermined angle in the axial direction of the rotating shaft.

According to the above-mentioned structure, the first motor and the second motor are arranged side by side in the axial direction, so that the rotational torque can be generated in the same manner as in the structure elongated in the axial direction. It is possible to increase the size and eliminate the gear mechanism. Further, the first and second electric motors do not need to be particularly elongated in the axial direction, and the winding of each electric motor can be automated. By shifting the second electric motor with respect to the first electric motor by a predetermined angle in the axial direction of the rotary shaft, the same operational effect as in the case where the skew is provided can be obtained, and the cogging torque can be reduced. .
In this case, since the second electric motor is only displaced from the first electric motor by a predetermined angle in the axial direction of the rotary shaft, the manufacturing becomes easier as compared with the case where the skew is provided.

According to a second aspect of the invention, the shift angle θ between the first electric motor and the second electric motor is 5 ° ≦ θ ≦ 40 in electrical angle.
It is characterized by being °. When the shift angle θ is smaller than 5 °, the effect of reducing the cogging torque is small, and when it is larger than 40 °, the effect of reducing the cogging torque is obtained.
The rotating torque is too low. Therefore, considering both the rotation torque and the cogging torque, it is preferable to set the shift angle θ in the above range.

According to a third aspect of the invention, the shift angle θ between the first stator and the second stator is an electrical angle of 5 ° ≦ θ ≦ 40.
It is characterized by being °. According to this configuration, it is possible to deal with this by shifting only the stator between the first electric motor and the second electric motor.

According to a fourth aspect of the invention, the shift angle θ between the first rotor and the second rotor is an electrical angle of 5 ° ≦ θ ≦ 40.
It is characterized by being °. According to this configuration, it is possible to deal with this by shifting only the rotor between the first electric motor and the second electric motor.

According to a fifth aspect of the present invention, an intermediate bracket is provided between the first electric motor and the second electric motor, and the intermediate bracket is provided with a bearing for rotatably supporting the intermediate portion of the rotary shaft. Is characterized by. When the first electric motor and the second electric motor are arranged side by side in the axial direction, the common rotating shaft becomes long, and therefore the rotating shaft is easily bent. Therefore, by adopting a structure in which the intermediate portion of the rotary shaft is supported by the intermediate bracket via the bearing, it is possible to prevent the rotary shaft from bending and to reduce the thickness of the rotary shaft.

According to the invention of claim 6, a sheave is arranged between an electric motor unit in which the first electric motor and the second electric motor are unitized, and a braking device provided in the axial direction of the electric motor unit, The support bracket of the brake device is
It is characterized in that it is configured to be supported via a support frame supported by a bearing bracket of the electric motor unit. According to this configuration, the brake device can be easily provided while the sheave is arranged between the electric motor unit and the brake device.

According to a seventh aspect of the present invention, there are provided permanent magnet type first and second rotors that are arranged adjacent to each other in the axial direction and are rotatably provided. An electric motor extending in the direction in which the children are arranged and having a common stator common to the first and second rotors, and a rotary shaft provided so as to rotate integrally with the first and second rotors. And a sheave provided so as to rotate integrally with the rotating shaft, wherein the second rotor is displaced with respect to the first rotor by a predetermined angle in the axial direction of the rotating shaft. Is characterized by.

In this structure, the electric motor has the structure in which the first and second rotors are arranged side by side in the axial direction with respect to the common stator, so that the structure is elongated in the axial direction. Similarly, the rotational torque can be increased and the gear mechanism can be eliminated. Also, by shifting the second rotor with respect to the first rotor in the direction around the axis of rotation by a predetermined angle, the same operational effect as in the case where the skew is provided can be obtained, and the cogging torque can be reduced. Becomes Also in this case, it becomes easier to manufacture as compared with the case where the skew is provided.

The invention of claim 8 is characterized in that, in the invention of claim 7, an end plate made of a non-magnetic material is arranged between the first rotor and the second rotor. . According to this configuration, the first rotor and the second rotor can be brought close to each other in the axial direction as much as possible, and the length in the axial direction can be suppressed.

According to a ninth aspect of the present invention, the shift angle θ between the first rotor and the second rotor is an electrical angle of 5 ° ≦ θ ≦ 40.
It is characterized by being °. The invention of claim 10 is characterized in that a speed / position detector is provided on the tip end side of the rotary shaft.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described below with reference to FIGS. First, FIG. 5 shows a schematic configuration of an elevator apparatus to which the hoisting machine of the present invention is applied. In FIG. 5, a hoisting machine installation section 32 is provided near the top of the guide rail 31, and a hoisting machine 33 is provided on a base 32a provided in the hoisting machine installation section 32. A sheave 34 rotated by the hoisting machine 33 is provided at one end of the hoisting machine 33, and a plurality of ropes 35 are hung on the sheave 34. A car 36 is connected to one end of the rope 35, and a weight mounting portion 37 having a counterweight 37a is connected to the other end. In this configuration, when the sheave 34 is rotated by the hoisting machine 33, the car 36 and the weight mounting portion 37 are moved up and down along the guide rail 31 via the rope 35.

The hoisting machine 33 will be described with reference to FIG. The hoisting machine 33 includes a rotary shaft 38 extending in the left-right direction in the figure, first and second electric motors 39 and 40 arranged adjacent to each other in the axial direction of the rotary shaft 38, and one end of the rotary shaft 38. The sheave 34 is attached to the section, and the brake device 41 and the speed / position detector 42 are provided on the other end side of the rotary shaft 38. First and second electric motor 3
Both 9 and 40 are three-phase brushless motors.

The above-mentioned first electric motor 39 and second electric motor 40
The frame 43 common to both and is in the shape of an elongated cylinder that is long in the axial direction. First stator 44 of first electric motor 39
Is composed of a cylindrical stator core 45 fixed in the frame 43, and a stator winding 46 attached to the stator core 45. As shown in FIG.
As shown in FIG. 5, a large number of teeth 47 and slots 48 are formed, and stator windings 46 of m-phase, in this case three-phase, are concentratedly wound around each tooth 47. Stator core 4
A permanent magnet type first rotor 50 having a large number of permanent magnets 49 is disposed in the central portion of 5. Permanent magnets 49 are formed on the first rotor 50 so that the magnetic poles of N poles and S poles alternate. The first rotor 50 is fixed to the outer peripheral portion of the rotary shaft 38.

The number of magnetic poles P of the first rotor 50 is 12 in this case. The number of teeth 47 and slots 48 of the stator core 45 is the number of phases m × the number of magnetic poles P /
2 = 3 × 12/2 = 18.

The second electric motor 40 also has the same structure as the first electric motor 39. That is, the second stator 51 of the second electric motor 40 is composed of a cylindrical stator core 52 fixed in the frame 43, and a stator winding 53 mounted on the stator core 52. Has been done. The stator core 52 is also formed with 18 teeth and 18 slots. A second permanent magnet type rotor 54 is disposed in the center of the stator core 52.
The rotor 54 also has 12 magnetic poles. The second rotor 54 is also fixed to the outer peripheral portion of the common rotating shaft 38.

Here, as shown in FIG. 3, the second rotor 54 is displaced from the first rotor 50 by a predetermined angle θ in the direction around the axis of the rotary shaft 38. The shift angle θ is set to an electrical angle of 5 ° ≦ θ ≦ 40 °.

Both axial ends of the rotary shaft 38 are rotatably supported by the left and right bearing brackets 55 and 56 via bearings 57, respectively. The braking device 41 is
It is arranged outside the bearing bracket 55 on the right side of FIG. The brake device 41 has a well-known structure and includes the coil 5
The movable plate 59 moves in the axial direction due to the disconnection of 8
Along with this, the brake is applied and released. The speed / position detector 42 is provided outside the brake device 41 on the tip side of the rotary shaft 38. The speed / position detector 42 includes, for example, a rotary encoder, and detects the rotation speed and the rotation position of the rotary shaft 38 (the first rotor 50 and the second rotor 54).

According to the structure described above, the following operational effects can be obtained. First electric motor 39 and second
By arranging the electric motor 40 and the electric motor 40 side by side in the axial direction, it becomes possible to increase the rotational torque of the electric motor as a whole, as in the case where the electric motor 40 is elongated in the axial direction.
The gear mechanism can be eliminated. Also, the first and second
The electric motors 39 and 40 do not need to be particularly long in the axial direction, and the winding of the electric motors 39 and 40 can be automated.

Then, the second rotor 54 of the second electric motor 40 is displaced with respect to the first rotor 50 of the first electric motor 39 by a predetermined angle θ in the direction around the axis of the rotary shaft 38, whereby the skew is generated. It is possible to obtain the same operation and effect as in the case of providing, and to reduce the cogging torque.

Here, FIG. 4 shows the relationship between the shift angle θ and the ratio of the rotation torque and the cogging torque to the conventional example (the hoisting machine 11 of FIG. 14) using a long electric motor. In FIG. 4, the rotation torque and the cogging torque of the conventional example (without skew) are set to 1. In FIG. 4, when the shift angle θ is set to about 5 °, the rotational torque is reduced by only about 0.5% as compared with the conventional example, while the cogging torque is reduced by about 3%. . Also,
When the shift angle θ is set to about 40 °, the rotation torque is reduced by about 23% as compared with the conventional example, while the cogging torque is reduced by about 50%.

Therefore, the shift angle θ is an electrical angle of 5 ° ≦ θ
Within the range of ≦ 40 °, the cogging torque is significantly reduced by about 3 to 50% compared to the conventional example, but the rotation torque is reduced by about 0.5 to 23% to cover. It becomes possible to do. If the shift angle θ is smaller than 5 °, the effect of reducing the cogging torque is small, and if it is larger than 40 °, the effect of reducing the cogging torque is effective, but the rotation torque is excessively reduced. Therefore, considering both the rotation torque and the cogging torque, it is preferable to set the shift angle θ in the above range.

In order to reduce the cogging torque,
In the present embodiment, since it is possible to deal with this by shifting only the second rotor 54 with respect to the first rotor 50, it is possible to easily manufacture as compared with the case where the skew is provided.

FIG. 6 shows a second embodiment of the present invention. The second embodiment is different from the above-mentioned first embodiment in the following points. That is, instead of shifting the second rotor 54 with respect to the first rotor 50, the second stator 51 is displaced with respect to the first stator 44 by a predetermined angle θ. The shift angle θ is the same as in the first embodiment.
The electrical angle is preferably 5 ° ≦ θ ≦ 40 °. Also in such a second embodiment, it is possible to obtain the same effects as those of the above-mentioned first embodiment.

FIG. 7 shows a third embodiment of the present invention. The third embodiment differs from the above-described first embodiment in the following points. That is, the frame is the frame 60 of the first electric motor 39 and the frame 6 of the second electric motor 40.
The intermediate bracket 62 is provided between the frames 60 and 61, and the intermediate bracket 62 is provided with a bearing 63 that rotatably supports the intermediate portion of the rotary shaft 38. With such a configuration, it is possible to prevent the rotation shaft 38 from bending and to reduce the thickness of the rotation shaft 38.

FIG. 8 shows a fourth embodiment of the present invention. The fourth embodiment differs from the above-described first embodiment in the following points. That is, the first electric motor 39 and the second electric motor 39
From the bearing bracket 55 on the left side of the electric motor unit 65, which is a unit of the electric motor 40, the one end of the rotary shaft 38 projects leftward in the drawing, and the brake device 41 is arranged on the left side of the electric motor unit 65. A sheave 67 is attached to the rotating shaft 38 so as to be located between the electric motor unit 65 and the brake device 41. The support bracket 68 of the brake device 41 is connected to the electric motor unit 6
5 is supported via a support frame 69 supported by the bearing bracket 55. The support frame 69 is arranged so that a rope (not shown) that is hung on the sheave 67 does not get caught. The speed / position detector 42 is disposed on the tip side of the rotary shaft 38 further outside the brake device 41.

According to this structure, the sheave 67 is arranged between the electric motor unit 65 and the brake device 41, but the brake device 41 can be easily arranged.

9 to 11 show a fifth embodiment of the present invention. The fifth embodiment differs from the first embodiment described above in the following points. That is, the electric motor 71
Is the first and second rotors 50, 54 arranged adjacent to each other in the axial direction of the rotary shaft 38 on the outer peripheral portion of the rotary shaft 38,
It is composed of a common stator 72 extending in the axial direction which is the direction in which the first and second rotors 50 and 54 are arranged. Of these, the stator 72 includes a cylindrical stator core 73 fixed in the frame 43 and the stator core 7
3 and a stator winding 74 mounted on the same.

On the outer peripheral portion of the rotary shaft 38, as shown in FIG. 10, first and second ridges 75, which extend in the axial direction,
76 is projected, and these first ridges 75 and second
It is deviated from the ridge portion 76 in the axial direction. As shown in FIGS. 11A and 11B, the first and second rotors 50 and 54 have a fitting groove 77 that fits into the first and second ridges 75 and 76. , 78 are formed, and the first and second rotors 50, 54 are positioned by fitting the fitting grooves 77, 78 into the corresponding first and second protrusions 75, 76. Has been done.

In FIG. 11, the difference (θB-θA) between the angle θA of the fitting groove 77 of the first rotor 50 and the angle θB of the fitting groove 78 of the second rotor 54 is calculated as follows: A displacement angle θ of the second rotor 54 with respect to the rotor 50 is set, and the displacement angle θ is set to an electrical angle of 5 ° ≦ θ ≦ 40 °.

An end plate 79 made of a non-magnetic material is arranged between the first rotor 50 and the second rotor 54.
Each of the first and second rotors 50 and 54 is configured by laminating a large number of steel plates, and the tip end of the long bolt 80 penetrating each of them is screwed into the screw hole of the end plate 79. As a result, they are fixed in a laminated state. A stop ring 81 is attached to the rotary shaft 38 so as to be located outside each of the first rotor 50 and the second rotor 54.

Also in the sixth embodiment having such a structure, it is possible to obtain substantially the same operational effects as those of the first embodiment. In this case, in particular, the first rotor 50 and the second rotor 50
By disposing the end plate 79 made of a non-magnetic material between the first rotor 50 and the second rotor 54.
Can be made as close to each other as possible, and the axial length of the electric motor 71 and thus the hoisting machine can be suppressed.

FIG. 12 shows a sixth embodiment of the present invention. This sixth embodiment is different from the above fifth embodiment in the following points. That is, in the electric motor 71,
The second rotor 54 is displaced from the first rotor 50 by a mechanical angle of 180 ° and further by an electrical angle of θ. Specifically, the angle θA of the fitting groove 77 of the first rotor 50,
The difference from the angle θC of the fitting groove 78 of the second rotor 54 (θC
-ΘA) is an angle obtained by adding a mechanical angle of 180 ° and a displacement angle θ, and the displacement angle θ is set to an electrical angle of 5 ° ≦ θ ≦ 40 °. Also in the sixth embodiment having such a configuration, the same operational effect as that of the fifth embodiment described above can be obtained.

The present invention is not limited to the above-mentioned embodiments, but can be modified or expanded as follows. The displacement of the second electric motor 40 by a predetermined angle with respect to the first electric motor 39 is not limited to the displacement of only the stator or the rotor, and both the stator and the rotor can be displaced. In this case, the total angle of the shift angles of the stator and the rotor is set to θ. In the first to fourth embodiments, the electric motor may have a configuration in which three electric motors, first to third, are arranged.

[0044]

According to the first aspect of the present invention, the first electric motor and the second electric motor are arranged side by side in the axial direction, so that the first electric motor and the second electric motor are arranged in the axial direction. ,
The rotation torque can be increased and the gear mechanism can be eliminated. Further, the first and second electric motors do not need to be particularly elongated in the axial direction, and the winding of each electric motor can be automated. Then, by shifting the second electric motor with respect to the first electric motor by a predetermined angle in the axial direction of the rotary shaft, the same operational effect as in the case where the skew is provided can be obtained, and the cogging torque can be reduced. . In this case, since the second electric motor is only displaced from the first electric motor by a predetermined angle in the direction around the axis of the rotary shaft, the manufacturing becomes easier as compared with the case where the skew is provided.

According to the invention of claim 7, as the electric motor, the first and second rotors are arranged side by side in the axial direction with respect to the common stator, so that the axially long structure is achieved. Similarly to the above, it becomes possible to increase the rotational torque, and the gear mechanism can be eliminated. Also, by shifting the second rotor with respect to the first rotor in the direction around the axis of rotation by a predetermined angle, the same operational effect as in the case where the skew is provided can be obtained, and the cogging torque can be reduced. Becomes Also in this case, it becomes easier to manufacture as compared with the case where the skew is provided. Furthermore, since the stator in the electric motor is common, the structure of the stator is simpler than that of the invention of claim 1.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention, and is a front view showing an upper half portion in a sectional state.

FIG. 2 is a vertical sectional side view of a first electric motor portion.

FIG. 3A is a vertical side view of a first rotor, and FIG. 3B is a vertical side view of a second rotor.

FIG. 4 is a characteristic diagram showing a relationship between a shift angle θ and a ratio of rotational torque and cogging torque with respect to a conventional example.

FIG. 5 is a perspective view showing a schematic configuration of an elevator apparatus.

6A and 6B show a second embodiment of the present invention, wherein FIG. 6A is a vertical sectional side view of a first stator, and FIG. 6B is a vertical sectional side view of a second stator.

FIG. 7 is a view corresponding to FIG. 1 showing a third embodiment of the present invention.

FIG. 8 is a front view showing a fourth embodiment of the present invention with a part thereof broken away.

FIG. 9 is a cutaway front view showing a fifth embodiment of the present invention.

FIG. 10 is a vertical sectional front view of the first and second rotors.

FIG. 11A is a vertical sectional side view of a first rotor portion,
(B) is a vertical sectional side view of the second rotor portion.

12A and 12B show a sixth embodiment of the present invention, in which FIG. 12A is a vertical sectional side view of a first rotor portion, and FIG. 12B is a vertical sectional side view of a second rotor portion.

FIG. 13 is a view corresponding to FIG. 5 showing a conventional example.

FIG. 14 is a view corresponding to FIG. 1 showing a different conventional example.

[Explanation of symbols]

In the drawing, 33 is a hoisting machine, 34 is a sheave, 38 is a rotating shaft, 3
9 is a first electric motor, 40 is a second electric motor, 41 is a braking device, 42 is a speed / position detector, 44 is a first stator, 49 is a permanent magnet, 50 is a first rotor, and 51 is a Second
, 54 is a second rotor, 55 and 56 are bearing brackets, 57 is a bearing, 57 is a bearing, 62 is an intermediate bracket, 63 is a bearing, 65 is an electric motor unit, 67 is a sheave, 68 is a support bracket, and 69 is a support. A frame, 71 is an electric motor, 72 is a stator, and 79 is an end plate.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H02K 1/27 H02K 1/27 501M 1/28 1/28 D 16/00 16/00 (72) Inventor Kazuo Nagatake 33, Shin-isogo-cho, Isogo-ku, Yokohama-shi, Kanagawa, Ltd. Within the Toshiba Production Technology Center, a stock company (72) Inventor Takanobu Kushihira 1-3-3 Shinmachi, Ome-shi, Tokyo Toshiba Digital Media Engineering Co., Ltd. Internal F-term ( Reference) 3F306 AA07 BA07 5H002 AA01 AA09 AB04 AB08 AC06 AE06 AE08 5H622 AA02 AA03 CA02 CA05 CA10 CA11 CB05 CB06

Claims (10)

[Claims] 1. A first stator having the first stator
A first electric motor having a permanent magnet type first rotor rotatably provided with respect to the stator, and a second stator arranged adjacent to the first electric motor in the axial direction. A second electric motor having a second permanent magnet type rotor rotatably provided with respect to the second stator; and integral with the first rotor and the second rotor. And a sheave provided so as to rotate integrally with the rotating shaft, wherein the second electric motor is provided with respect to the first electric motor as the shaft of the rotating shaft. A hoisting machine characterized by being displaced by a predetermined angle in the circumferential direction. 2. The hoisting machine according to claim 1, wherein a shift angle θ between the first electric motor and the second electric motor is 5 ° ≦ θ ≦ 40 ° in electrical angle. 3. The hoisting machine according to claim 1, wherein the displacement angle θ between the first stator and the second stator is 5 ° ≦ θ ≦ 40 ° in electrical angle. . 4. The hoisting machine according to claim 1, wherein the displacement angle θ between the first rotor and the second rotor is an electrical angle of 5 ° ≦ θ ≦ 40 °. . 5. An intermediate bracket is provided between the first electric motor and the second electric motor, and the intermediate bracket has:
The hoisting machine according to any one of claims 1 to 4, further comprising a bearing that rotatably supports an intermediate portion of the rotating shaft. 6. A sheave is arranged between an electric motor unit in which a first electric motor and a second electric motor are unitized, and a braking device provided in the axial direction of the electric motor unit, and the sheave is supported. The hoisting machine according to any one of claims 1 to 4, wherein the bracket is configured to be supported via a support frame supported by a bearing bracket of the electric motor unit. 7. A permanent magnet type first and second rotors, which are arranged adjacent to each other in the axial direction and are rotatably provided, and which are arranged in a direction in which the first and second rotors are arranged. An electric motor that extends and has a stator common to the first and second rotors; a rotary shaft that is provided so as to rotate integrally with the first and second rotors; And a sheave provided so as to rotate integrally with each other, wherein the second rotor is displaced from the first rotor by a predetermined angle in a direction around the rotation shaft. Machine. 8. Between the first rotor and the second rotor,
The hoisting machine according to claim 7, further comprising an end plate made of a non-magnetic material. 9. The winding according to claim 7, wherein the displacement angle θ between the first rotor and the second rotor is 5 ° ≦ θ ≦ 40 ° in electrical angle. Good machine. 10. The hoisting machine according to claim 1, further comprising a speed / position detector on the tip side of the rotary shaft.