JP2001286114A - Motor and elevator unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable to reduce torque fluctuation, vibration and noise as well as to enhance efficiency, and also to reduce the number of assembling processes. SOLUTION: A motor for a hoist comprises a three-phase twenty-pole brush- less outer-rotor motor. The motor comprises of 63 pieces of slots of a stator core, 6 pieces of empty slots (Slot No.9, 11, 30, 32, 51, 53) formed at the stator and 30 pieces of coils 38 that are wound such that 3 pieces of the slots (slot No.10, 31, 52) are wound in single layer and all of the remaining in a double layer. The torque fluctuation can be reduced in accordance with the l.c.m of the increased least common multiple of the number of magnetic poles (20) and the slots (63). Also, an easy mechanical winding to each coil 38 becomes feasible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor having a permanent magnet rotor and an elevator apparatus provided with the electric motor.

[0002]

FIG. 16 shows a configuration 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 hoist 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 section 9 having a counterweight 9 a is connected to the other end. Have been. 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.

[0003] In the above-mentioned conventional construction, since the gear mechanism 5 is required between the electric motor 4 and the sheave 6, there is a disadvantage that the hoisting machine 3 becomes large and a large installation space is required. .

On the other hand, recently, a hoist used in such an elevator apparatus does not use a gear mechanism.
A so-called gearless type is being considered. FIG. 17 shows an example of an electric motor used for such a hoist.
FIG. 17 shows only a part of the electric motor. The electric motor is an m-phase, in this case, a three-phase epicyclic brushless motor. The permanent magnet type rotor 11 is configured by providing 20 permanent magnets 13 on a rotor core 12 so as to form P poles, for example, 20 magnetic poles. On the other hand, the stator core 15 of the stator 14 has (m × P), in this case (3 × 20), teeth 16 and slots 17 corresponding to the m-phase P pole, 18
Is (mx ×) so that each slot 17 is wound in two layers.
In this case, (3 × 20) pieces are wound.

In the motor having such a configuration, as described above, the number of slots of the stator core 15 is (m × P) corresponding to the m-phase P pole, and in this case, (3 × 20). Yes, the number of magnetic poles (20 in this case) and the number of slots (6 in this case)
Since the least common multiple of 0) is small (60 in this case), the cogging torque is large. Therefore, there is a disadvantage that torque fluctuation increases and efficiency decreases. Also, vibration and noise increase. Further, the coil 18 is (m × P)
In this case, since it is composed of (3 × 20) coils 18, it has a spiral winding configuration as shown in FIG. 17, and mechanical winding is difficult. This has been a major factor in the increase in the number of assembly steps.

The present invention has been made in view of the above circumstances, and a first object of the present invention is to reduce torque fluctuation,
An object of the present invention is to provide a motor capable of improving efficiency, reducing vibration and noise, and reducing the number of assembly steps. Further, a second object is to provide an elevator apparatus having a comfortable ride.

[0007]

In order to achieve the first object, the invention according to claim 1 comprises a permanent magnet type rotor having P poles (P is an integer) and a plurality of slots. And a stator having m-phase (m is an integer) coil wound around the stator core, and the number of slots of the stator core is (m × P + K) ( Here, K is an odd number satisfying 1 ≦ K ≦ m), and (m × 2) empty slots are formed in the stator core.
It is characterized in that (m × P / 2) coils are wound so that the m slots are wound in two layers and the remaining slots are wound in a single layer.

According to the above configuration, the number of slots of the stator core is (m × P + K) (where K is 1 ≦ K ≦ m
The number of magnetic poles of the rotor (P)
, The least common multiple of the number of slots (m × P + K) increases. Therefore, the cogging torque can be reduced, and the torque fluctuation can be reduced. Also, (m × 2) empty slots are formed in the stator core having such a configuration, and m
The slots are wound in two layers, and the remaining slots are wound in a single layer, so that (m × P / 2) coils are wound, thereby enabling concentrated winding.
It becomes possible to wind at the same pitch. This allows
Mechanical winding of the coil is facilitated.

According to another aspect of the present invention, there is provided a permanent magnet rotor having a P-pole (P is an integer) magnetic pole, and a stator core having a plurality of slots formed therein. And a stator having m-phase (m is an integer) coil wound around the stator core, wherein the number of slots of the stator core is (m × P + K) (where K is 1 ≦ K ≦ m
(M is an odd number that satisfies the following), and m free slots are formed in the stator core, and (m × P / 2) coils are wound in a single-layer winding.

Also in this configuration, the number of slots of the stator core is (m × P + K) (where K is an odd number satisfying 1 ≦ K ≦ m), so the number of magnetic poles (P) of the rotor is
, The least common multiple of the number of slots (m × P + K) increases. Therefore, the cogging torque can be reduced, and the torque fluctuation can be reduced. In addition, by forming m empty slots in the stator core having such a configuration and winding (m × P / 2) coils in a single-layer winding, mechanical winding is facilitated. become.

According to a third aspect of the present invention, the coil has three phases of U, V, and W. When the U-phase No. 1 coil is stored in the No. 1 slot, the V-phase No. 1 coil is stored in the No. 1 slot. The first slot containing the U-phase coil has a phase difference of 120 degrees in both mechanical angle and electrical angle with respect to the first slot containing the U-phase coil, and the slot containing the W-phase coil is the first slot containing the U-phase coil. The feature is that the number of magnetic poles and the number of slots are set so that the mechanical angle and the electrical angle both have a phase difference of 240 degrees. According to this, the commutation error to the U, V, and W phases is reduced, and the torque fluctuation can be further reduced.

According to a fourth aspect of the present invention, in the stator core, the tooth tip pitch of each tooth end of the stator core is set to 360.
/ (M × P + K) degrees, and the teeth center line is shifted clockwise by a predetermined angle with respect to the tooth center line so that the teeth pitch approaches the pitch of 360 / (m × P) degrees. 1 tooth, a second tooth in which the tooth center line is shifted by a predetermined angle in the counterclockwise direction with respect to the tooth center line, and a third tooth in which the tooth center line and the tooth center line are matched. This is characterized by having a configuration having: According to this, the characteristic error between the case where the rotor rotates clockwise and the case where the rotor rotates counterclockwise can be reduced, and the torque fluctuation can be further reduced.

According to a fifth aspect of the present invention, there is provided a permanent magnet type rotor having P poles (P is an even number of 12 or more), a stator core having a plurality of slots formed therein, and a stator core wound around the stator core. And a stator having three-phase coils. The number of slots of the stator core is (3 × P + 3), and (3 × 2) empty slots are formed in the stator core. (3 × P / 2) coils are wound so that the three slots are wound in two layers and all the remaining slots are wound in a single layer, and the number of coils in each phase is (P / 2) When the first slot containing the U-phase No. 1 coil is used as a reference, the coils of each phase are spaced such that the slot pitch between adjacent coils is 3 slot pitch, 4 slot pitch, 3 slot pitch And only the group near the last slot is 3 slots Topitchi, three-slot pitch,
It is characterized by being arranged at intervals of 4 slot pitch.

Also in this configuration, since the number of slots of the stator core is (3 × P + 3), the least common multiple of the number of magnetic poles (P) of the rotor and the number of slots (3 × P + 3) is large. . Therefore, the cogging torque can be reduced, and the torque fluctuation can be reduced. Moreover, the coils of each phase are arranged at intervals such that the slot pitch between adjacent coils is 3 slot pitch, 4 slot pitch, 3 slot pitch, and only the group near the last slot has 3 slot pitch, 3 slot pitch, By arranging them at intervals of a 4-slot pitch, torque fluctuation can be further reduced.

In order to achieve the above-mentioned second object, the invention according to a sixth aspect of the present invention is directed to a car which is supported on a rope so as to be vertically movable along a first guide rail via a pulley, A weight mounting part having a counterweight supported vertically movably along the second guide rail with respect to the rope, and an electric motor for a hoist according to any one of claims 1 to 5. It is characterized by. According to this, riding comfort can be improved by using an electric motor for a hoist capable of reducing torque fluctuation in the elevator device.

The invention according to claim 7 is characterized in that an electric motor for a hoist is installed in the weight mounting portion. According to this, a dedicated machine room is not required in the elevator device, and the weight of the electric motor for the hoist also acts as a weight, so that the amount of the counterweight in the weight mounting portion can be reduced.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, in FIG. 5 showing a schematic configuration of an elevator apparatus, a car 21 moves up and down along a first guide rail 22, and a weight mounting portion 24 on which a counter weight 23 is mounted is a second
Along the guide rail 25. The rope 26 has one end 26a fixed near the top of the first guide rail 22 for the car 21 and the other end 26b near the top of the second guide rail 25 for the weight mounting portion 24. , And an intermediate portion thereof is hooked on an intermediate pulley 27 installed near the tops of the first and second guide rails 22 and 25.

The car 21 includes an intermediate pulley 27 and a rope 2.
6, is supported by the rope 26 so as to be vertically movable via a pair of moving pulleys 28, 28. The weight mounting portion 24 is located between the intermediate pulley 27 and the other end 26b of the rope 26,
6 is supported by a hoisting machine 29 to be described later so as to be vertically movable. The hoisting machine 29 is installed so as to be housed in a case 30 a provided above the frame 30 of the weight mounting section 24.

In FIG. 4 showing the hoisting machine 29, the electric motor 31 for the hoisting machine 29 is constituted by an m-phase, in this case, a three-phase brushless motor. At the center of the support plate 32, a cylindrical sleeve 33 is fixedly provided so as to protrude rightward in FIG. 4, and a stator 34 is provided on the outer periphery of the sleeve 33. This stator 3
Reference numeral 4 denotes a stator core 37 having a number of teeth 35 and slots 36 as shown in FIG.
7 and a number of coils 38 wound around.

A rotating shaft 41 of a permanent magnet type rotor 40 is rotatably inserted into the inner peripheral portion of the sleeve 32 via ball bearings 39, 39. The rotor 40 is
The rotating shaft 41, a disk-shaped rotor base 42 integrally formed with the rotating shaft 41, and an inner surface of an annular convex portion 42 a formed on the rotor base 42 surround the stator 34. An annular rotor core 43 provided, and a plurality of permanent magnets 44 embedded in the rotor core 43
The inner peripheral surface of the rotor core 43 faces the outer peripheral surface of the stator core 37 with a predetermined gap.

A bearing holder 45 for supporting the inner race of the bearing 39 is provided at the axial end of the rotating shaft 41.
A mounting hole 46 is formed in the center of the rotating shaft 41, and a mounting shaft 48 of a sheave 47 having a plurality of grooves 47 a on the outer periphery is inserted into the mounting hole 46. A key 49 is inserted between the mounting shaft 48 and the rotating shaft 41, and the key 49 allows the rotating shaft 41 and the mounting shaft 48, and furthermore, the rotor 40 and the sheave 47 to rotate integrally. ing. The rope 26 is hooked on the groove 47a of the sheave 47. Although not shown, the hoisting machine 29 having such a configuration has the rotor 4
A speed detector for detecting the rotation speed of 0 (the sheave 47) is provided.

In this case, the number of permanent magnets 44 in the rotor 40 is 20 in this case, and the number of magnetic poles P is set to 20 (in FIG. 1, N1 to N10, S1 to S10).
reference). Further, the teeth 3 in the stator core 37 are used.
The number of 5 and slots 36 is (m × P + K) (where K is an odd number satisfying 1 ≦ K ≦ m), in which case m = 3,
P = 20, K = 3, and 63 are set (see the number of slots in the figure).

As shown in FIG. 1, the stator core 37 has (m × 2), in this case, six empty slots 3.
6a (in FIG. 1, a slot number circled by a dotted line;
9, 11, 30, 32, 51, and 53), and m slots, in this case, three slots 36, are double-layer wound (slot numbers 10, 3 surrounded by squares in FIG. 1).
1, 52), and the remaining slots 36 are (m × P / 2), in this case, 30 coils 38 (U-phase, V-phase, W-phase coils 38 10 pieces each). The U-phase, V-phase, and W-phase ten coils 38 are connected in series in each phase.
The three-phase coils 38 of the phase, V-phase, and W-phase are star-connected as shown in FIG.

When the U-phase No. 1 coil (U1) among the U-, V-, and W-phase coils 38 is placed in the No. 1 slot (1), the V-phase No. 1 coil (V1) is The slot for storing the No. 1 slot (1) for storing the U-phase coil is the No. 22 slot having a phase difference of 120 degrees in both mechanical angle and electrical angle with respect to the No. 1 slot (1), and the slot for storing the W-phase No. 1 coil (W1) The slot number is set so as to be the 43rd slot having a phase difference of 240 degrees in both the mechanical angle and the electrical angle with respect to the 1st slot (1) in which the U-phase coil is accommodated. In FIG. 1,
U, V, W... Displayed on the magnetic poles (N1, S1 to N10, S10) of the rotor 40 indicate magnetic poles formed by the coil 38 of the stator 34.

In the above-described configuration, a rotational torque is generated by energizing the three-phase coils 38 of U, V, and W in the electric motor 31, and the rotor 11 is rotated by the rotational torque. Based on the rotation of the sheave 47 integrally therewith, the car 21 is vertically moved along the first guide rail 22 via the rope 26, and the weight mounting portion 24 is moved along the second guide rail 25. Moved up and down.

According to the first embodiment, the following effects can be obtained. First, the electric motor 3 of the hoisting machine 29
1, the number of phases m of the coil 38 of the stator 34 is m = 3, the number of magnetic poles of the rotor 40 is P = 20, and K = 3.
7, the number of slots is m × P + K = 63, so the number of rotor magnetic poles (P = 20) and the number of slots (m × P + K)
(P + K = 63) is as large as 1260. Therefore, the cogging torque of the electric motor 31 can be reduced, and the torque fluctuation can be reduced.

FIG. 6 shows the case of the first embodiment of the present invention in which the number of magnetic poles P = 20 and the number of slots = 63 (solid line), the number of magnetic poles P = 20 and the number of slots = 60. Angle (mechanical angle) in the case of the conventional example (dotted characteristic line)
And the relationship between torque and torque. As is clear from FIG. 6, it is understood that the torque fluctuation can be greatly reduced in the first embodiment of the present invention as compared with the conventional example. In FIG. 6, the numbers described along the horizontal axis of the torque [0.00] indicate the rotation angle (mechanical angle). In the first embodiment of the present invention, the efficiency of the electric motor 31 can be improved, and the vibration and noise can be reduced, as the torque fluctuation can be reduced in this way.

Further, m ×
2 = 6 empty slots 36a are formed, and m =
As shown in FIG. 2, m × P / 2 = 30 coils 38 are wound so that the three slots 36 are wound in two layers and the remaining slots 36 are wound in a single layer. In addition, concentrated winding becomes possible, and winding at the same pitch becomes possible. Thereby, the mechanical winding of the coil 38 is facilitated, the number of assembling steps can be reduced, and the cost can be reduced.

Further, when the U-phase No. 1 coil of the U, V, W three-phase coils 38 is placed in the No. 1 slot,
The slot in which the first coil of the V phase is accommodated is 120 mechanical and electrical angles in comparison with the first slot in which the U phase coil is accommodated.
The number of magnetic poles P = P has a phase difference of degree, and the number of magnetic poles P is set such that the mechanical angle and the electrical angle have a phase difference of 240 degrees with respect to the number 1 slot containing the U-phase coil. By setting 20 and the number of slots = 63, the commutation error to the U, V, and W phases is reduced, and the torque fluctuation can be further reduced.

Further, in the elevator apparatus, the riding comfort can be improved by using the motor 31 for the hoist capable of reducing the torque fluctuation. In addition, since the hoisting machine 29 is installed on the weight mounting portion 24 in the elevator apparatus, the first and second guide rails 2 are provided.
It is not necessary to provide a dedicated machine room near the tops of the counterweights 2 and 25, and the weight for the hoisting machine 29 also acts as a weight.
There is also an advantage that the amount of 3 can be reduced.

FIGS. 7 to 9 show a second embodiment of the present invention. The second embodiment differs from the first embodiment in the following points. That is, in FIGS. 7 and 8, the stator core 52 of the stator 51 has first, second and third types of teeth 5 as teeth.
3, 54 and 55 are formed. In addition, these first to first
The total number of the third teeth 53, 54, 55 and the number of the slots 56 are m × P + K = 63 as in the first embodiment.
Individual.

The stator core 52 specifically has the following teeth. That is, the tip pitch θh (the angle between the centers of the adjacent tips 53a, 54a, 55a) of the tips of the teeth 53, 54, 55 is 360 / (mxP + K) degrees, in this case, 360 degrees.
/ 63 degrees, but the teeth pitch θ
t (the angle between the centers of the adjacent teeth 53, 54, 55) is 360 / (m × P) degrees, in this case 360 /
A first tooth 53 whose tooth center line 57 is shifted clockwise by an angle t1 with respect to the tooth center line 58 so as to approach a pitch of 60 degrees, and a tooth center line 57 with respect to the tooth center line 58 The second tooth 54 is displaced at an angle t2 in the counterclockwise direction, and the third tooth 55 (see FIG. 7) in which the tooth center line 57 and the tooth tip center line 58 are aligned.

In this case, the total number of the first teeth 53 is 30, and 10 of them are arranged in three places. The total number of the second teeth 54 is 30 as in the case of the first teeth 53,
Ten of them are arranged in three places. The total number of the third teeth 55 is three, and
Each piece is arranged in three places. In FIG. 8, a slot between the first teeth 53 and the second teeth 54 is an empty slot 56a.

According to the second embodiment, the stator core 52 has the above-described configuration, so that the characteristics when the rotor 40 rotates clockwise and when the rotor 40 rotates counterclockwise are described. The error can be reduced, and the torque fluctuation can be further reduced. Here, FIG. 9 shows the relationship between the electric angle and the torque in the case of the first embodiment of the present invention (dotted characteristic line) and in the second embodiment of the present invention (solid line of characteristic line). As is apparent from FIG. 9, it is understood that the torque fluctuation can be further reduced in the second embodiment of the present invention as compared with the first embodiment.

FIGS. 10 and 11 show a third embodiment of the present invention. The third embodiment differs from the first embodiment in the following points. That is, the stator core 3
5, m, in this case, three empty slots 36a (FIG. 1)
0, slot numbers circled by dotted lines, 11, 3
2, 53) and a single layer winding (mxP
/ 2) coils, in this case 30 coils 38 (U-phase, V-phase,
Each of the W-phase coils 38 is wound around ten coils).

According to the third embodiment, in particular, the three coils 38 (see U9, V9 and W9 in FIG. 10) wound so as to straddle the empty slot 36a have a large winding coefficient. Therefore, there is an advantage that the generated torque can be increased.

FIGS. 12 and 13 show a fourth embodiment of the present invention. In FIG. 12, as in the first embodiment,
Number of phases m = 3, number of magnetic poles P = 20, number of slots (3 × 20 + 3) = 63, number of coils (3 × 20/2) =
30 (U-phase, V-phase, W-phase coils 38 each 10)
The arrangement of the slots 36 and the coils 38 in the electric motor of FIG. In this case, slot numbers 9, 11, 30,
32, 57, and 59 (numbers surrounded by dotted circles) are empty slots, and slot numbers 10, 31, and 58 (numbers surrounded by squares) are double-layer wound.

Here, in the U phase, the first coil (U
1) is stored in the first slot and the fourth slot, the second coil (U2) is stored in the seventh slot and the tenth slot, and the adjacent first coil (U1) and the second coil The pitch between (U2) is a 3-slot pitch (in FIG. 12, indicated by 3sp). Also,
The No. 3 coil (U3) is accommodated in the No. 14 slot and the No. 17 slot, and the pitch between the adjacent No. 2 coil (U2) and No. 3 coil (U3) is set to a 4-slot pitch (in FIG. 12, 4 sp). Further, the fourth coil (U4) is housed in the 20th slot and the 23rd slot, and the adjacent third coil (U4)
The pitch between the third coil and the fourth coil (U4) is a three-slot pitch (in FIG. 12, indicated by 3sp).

Therefore, the groups of the first coil (U1) to the fourth coil (U4) are arranged at intervals of 3 slot pitch, 4 slot pitch, and 3 slot pitch. Similarly, the groups of the fourth coil (U4) to the seventh coil (U7) are arranged at intervals of 3 slot pitch, 4 slot pitch, and 3 slot pitch. In contrast, coil 7 (U7) to coil 10 (U10)
Group (group close to the 63rd slot which is the last slot) has a 3-slot pitch, a 3-slot pitch,
They are arranged at a pitch of 4 slots.

The V-phase No. 1 coil (V1) starts from the 22nd slot, but is close to the 63rd slot which is the last slot (from the 4th coil (V4) to the 7th coil (V1)).
Group 7) is arranged at intervals of 3 slot pitch, 3 slot pitch, and 4 slot pitch, and the other groups (7th coil (V7) to 10th coil (V1
Group 0) and the group of the first coil (V1) to the fourth coil (V4)) are arranged at intervals of 3 slot pitch, 4 slot pitch, and 3 slot pitch. Also, the W-phase No. 1 coil (W1) starts from the 43rd slot, but the group (No. 1 coil (W1) to 4th coil (W1
Group 4) is arranged at intervals of 3 slot pitch, 3 slot pitch, and 4 slot pitch, and the other groups (4th coil (W4) to 7th coil (W7))
Group and the seventh coil (W7) to the tenth coil (W10)) are arranged at intervals of 3 slot pitch, 4 slot pitch, and 3 slot pitch.

Therefore, in this case, based on the first slot containing the U-phase No. 1 coil (U1), the coils of each phase have a slot pitch between adjacent coils of 3 slots, 4 slots, The group is repeated at intervals of 3 slots pitch, and only the group near the last slot is arranged at intervals of 3 slots pitch, 3 slots pitch, and 4 slots pitch.

By the way, in the case of the first embodiment, as shown in FIG. 14, the slot pitch between adjacent coils is 3 slot pitches in all of the U-phase, V-phase and W-phase.
It was repeated in an arrangement of intervals of 4 slot pitch and 3 slot pitch.

Here, the number of slots is m × P = 3 × 20 =
With reference to the positions of the ten coils of each phase arranged on the 60 stator cores (hereinafter referred to as reference positions), the deviation angles (mechanical angles) with respect to these reference positions were examined.
In the case of the coil arrangement of the first embodiment (the arrangement of FIG. 14), the deviation angle of the coil of each phase with respect to the reference position is:
The result is shown in FIG. As can be seen from FIG. 15, in the case of the coil arrangement of the first embodiment, the deviation angle is -1.8 degrees at the maximum on the minus side, while +3 degrees at the maximum on the plus side. It is found that the angle is 3 degrees, which is larger in the positive direction.

On the other hand, in the case of the coil arrangement of the fourth embodiment (the arrangement of FIG. 12), the deviation angles of the coils of each phase with respect to the reference position are as shown in FIG. As can be seen from FIG. 13, in the case of the coil arrangement of the fourth embodiment, the deviation angle is -2.2 degrees at the maximum on the minus side, but +3 degrees at the maximum on the plus side. It is slightly smaller, and it can be seen that the balance between the shift on the plus side and the shift on the minus side is improved. As a result, in the case of the coil arrangement of the fourth embodiment, the deviation angle from the first coil to the tenth coil of each phase is smaller than that in the case of the coil arrangement of the first embodiment. The torque fluctuation at the time can be further reduced, and the efficiency can be further improved, and the vibration and noise can be further reduced. In addition, since the balance between the plus side shift and the minus side shift is improved, there is an advantage that errors in the motor speed torque characteristics depending on the rotation direction are reduced.

[0045]

As is apparent from the above description, according to the electric motor of the present invention, the cogging torque can be reduced, the torque fluctuation can be reduced, the efficiency can be improved, the vibration and noise can be reduced, and the assembling can be performed. The number of steps can be reduced. Further, according to the elevator apparatus of the present invention, the riding comfort can be improved by using an electric motor for a hoist capable of reducing torque fluctuation.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention, in which a coil,
Exploded view showing the relationship between slots and magnetic poles

FIG. 2 is a plan view of a main part of the electric motor.

FIG. 3 is a wiring diagram of a coil.

FIG. 4 is a sectional view of a hoist.

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

FIG. 6 is a characteristic diagram showing a relationship between a rotation angle (mechanical angle) and a torque.

FIG. 7 is a plan view of an entire stator core showing a second embodiment of the present invention.

FIG. 8 is a plan view of a main part of the electric motor.

FIG. 9 is a characteristic diagram showing a relationship between an electric angle and a torque.

FIG. 10 is a view corresponding to FIG. 1, showing a third embodiment of the present invention;

FIG. 11 is a diagram corresponding to FIG. 2;

FIG. 12 is a view showing an arrangement of slots and coils according to a fourth embodiment of the present invention.

FIG. 13 is a diagram showing the relationship between the position (number) of each phase coil and the angle of deviation from the reference position.

FIG. 14 is a diagram corresponding to FIG. 12 in the case of the first embodiment for comparison with the fourth embodiment of the present invention.

FIG. 15 is a diagram corresponding to FIG. 13 in the case of the first embodiment.

FIG. 16 is a diagram corresponding to FIG. 5 showing a conventional example.

FIG. 17 is a diagram corresponding to FIG. 2, showing a different conventional example.

[Explanation of symbols]

In the drawing, 21 is a car, 22 is a first guide rail, 23
Is a counterweight, 24 is a weight mounting portion, 25 is a second guide rail, 26 is a rope, 27 is an intermediate pulley, 2
8 is a moving pulley (pulley), 29 is a hoist, 31 is an electric motor, 3
4 is a stator, 35 is a tooth, 36 is a slot, 36a
Is an empty slot, 37 is a stator core, 38 is a coil, 4
0 is a rotor, 42 is a rotor base, 43 is a rotor core,
44 is a permanent magnet, 47 is a sheave, 51 is a stator, 52 is a stator core, 53 is a first tooth, 54 is a second tooth, 55 is a third tooth, 53a, 54a and 55a are tooth tips. , 56 are slots, 56a is an empty slot, 57 is a tooth center line, 58 is a tooth center line, θh is a tooth pitch, and θt is a tooth pitch.

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Takanobu Kushihira 33F, Shinisogocho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture F-term in Toshiba Production Technology Center Co., Ltd. 3F306 AA01 AA12 BA00 DA00 5H603 AA01 AA09 BB01 BB09 BB10 BB13 CA01 CA05 CB01 CC05 CC17 CD01 CD02 CD21 5H621 AA02 BB07 BB10 GA01 GA04 GA11 HH01 JK15 JK19

Claims (7)

[Claims] 1. A permanent magnet type rotor having P poles (P is an integer), a stator core having a plurality of slots formed therein, and an m-phase (m is an integer) wound around the stator core. ), And the number of slots of the stator core is (m × P + K) (where K is an odd number that satisfies 1 ≦ K ≦ m). And (m × P / 2) coils are wound so that × 2) empty slots are formed, m slots are wound in two layers, and all remaining slots are wound in a single layer. An electric motor characterized by: 2. A permanent magnet type rotor having P poles (P is an integer), a stator core having a plurality of slots formed therein, and an m phase wound around the stator core (m is an integer). ), The number of slots of the stator core is (m × P + K) (where K is an odd number satisfying 1 ≦ K ≦ m), and the number of slots is m in the stator core. An electric motor characterized in that an empty slot is formed and (mxP / 2) coils are wound in a single-layer winding. 3. The coil has three phases of U, V and W. When the first coil of the U phase is stored in the first slot, the slot for storing the first coil of the V phase is the U phase coil. Has a phase difference of 120 degrees in both mechanical angle and electrical angle with respect to the first slot containing the W, and the slot for storing the W-phase No. 1 coil is
3. The number of magnetic poles and the number of slots are set so that both the mechanical angle and the electrical angle have a phase difference of 240 degrees with respect to the first slot containing the U-phase coil.
An electric motor as described. 4. The stator core has a tip tip pitch of 360 / (m × P + K) at the tip of each tooth of the stator core.
And the teeth pitch is 360 / (mx
P) a first tooth in which the tooth center line is shifted by a predetermined angle clockwise with respect to the tooth center line so as to approach the pitch of degrees, and the tooth center line is rotated counterclockwise with respect to the tooth center line. A second tooth shifted by a predetermined angle in the direction;
3. The electric motor according to claim 1, further comprising a third tooth having the tooth center line and the tooth center line aligned with each other. 4. 5. A permanent magnet rotor having P-pole (P is an even number of 12 or more) magnetic poles, a stator core having a plurality of slots formed therein, and a three-phase rotor wound around the stator core. A stator having a coil, wherein the number of slots of the stator core is (3 × P + 3); (3 × 2) empty slots are formed in the stator core; (3 × P / 2) coils are wound so that the double-layer winding and the remaining slots are all single-layer windings. The number of coils in each phase is (P / 2). When the first slot containing the first coil is used as a reference, the coils of each phase are arranged at intervals such that the slot pitch between adjacent coils is three, four, or three. Only groups close to slots have 3 slot pitch, 3 slot An electric motor characterized by being arranged at intervals of a lot pitch and a 4-slot pitch. 6. A vehicle which is supported by a rope via a pulley along a first guide rail so as to be vertically movable, and which is supported by said rope so as to be vertically movable along a second guide rail. An elevator apparatus comprising: a weight mounting portion having a counterweight; and a motor for a hoist according to any one of claims 1 to 5. 7. The elevator apparatus according to claim 6, wherein an electric motor for a hoist is installed on the weight mounting portion.