JP2004046023A - Method of driving rotating body by rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method which incorporates a rotary electric machine and an inexpensive decelerating body in a drum with techniques suitable for drum driving in a copying machine or a laser beam printer. <P>SOLUTION: In a drum actuator, the drum is arranged so as to have the axis of rotation concentric with the axis of rotation of an outer rotor and rotation of the outer rotor is transmitted to an inner periphery or a side face of the drum through the decelerating body in an outside rotation type rotary electric machine having the outer rotor rotated concentrically with a stationary shaft having a stator. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine most suitable for driving a drum of a copying machine such as OA equipment.
[0002]
[Prior art]
The rotation speed of the drum of a copying machine is as low as about 40 to 100 rpm, and a very small value is required at this rotation speed. Therefore, a brushless motor is used as the rotating electric machine, so the rotation speed is about 1500 rpm. Therefore, since the speed is reduced from the rotation speed, the reduction ratio becomes about 1/25, and the reduction ratio becomes large, so that the number of reduction stages increases accordingly.
Since the output shaft of the speed reducer is not on the same straight line as the rotating shaft of the rotating electric machine, it takes up space and makes it difficult to reduce the size.
Since the rotating electric machine was arranged outside the drum, it was difficult to further reduce the size.
The above contents can be understood from FIG. 6 showing the configuration of the prior art. That is, the rotating electrical machine (51) of about 1500 rpm is attached to the output shaft (53) and the reduction gear (54) is rotated by the pinion gear (52), and the reduction gear is fastened by the reduction shaft (56). By rotating (57), the drum (59) was rotated via the drum shaft (58). In this case, since 53 and 58 are not concentric on a straight line, miniaturization has been difficult.
[0003]
[Problems to be solved by the invention]
By setting the reduction ratio of the reduction body to about 1/5 and making the reduction body simple and small, the drum drive system can be simply configured while maintaining good rotation unevenness.
In order to make the combination of the rotating electric machine and the drum as small as possible, a device for storing the rotating electric machine and the reduction unit inside the drum is devised.
Reduce the speed reducer backlash.
Reducer with large transmission torque.
[0004]
[Means for Solving the Problems]
[Means 1] In a rotating electrical machine in which an outer rotor rotates concentrically with a stationary shaft having a stator, a drum is arranged such that its rotating axis is concentric with the outer rotor rotating axis, and the inner periphery of the drum is Alternatively, the rotation of the outer rotor is transmitted to the side surface via a speed reducer, and a drum driving method using a rotating electrical machine.
[Means 2] A method of driving a drum by a rotating electric machine according to the means 1, wherein the rotary support of at least one drum is supported by a stationary shaft of the rotating electric machine via a bearing.
[Means 3] In a rotating electrical machine in which an outer rotor rotates concentrically with a stationary hollow shaft having a stator, a drum is arranged so that its rotating axis is concentric with the outer rotor rotating axis. The rotation of the outer rotor is transmitted to the circumference or the side via a speed reducer, and a shaft is passed through the hollow portion of the rotating electric machine, and the shaft is supported at least at one position by a stationary shaft of the rotating electric machine via a bearing. A drum driving method using a rotating electric machine.
"Means 4" The output of the rotating electric machine having the output shaft concentrically decelerated with the output shaft of the inner rotor type rotating electric machine is provided on the inner periphery or side surface of the drum, and the decelerated output rotating shaft of the rotating electric machine and the rotating shaft of the drum are provided. A drum driving method using a rotating electric machine, wherein torque is transmitted while concentric with each other.
[Means 5] A drum driving method using a rotating electric machine, wherein the speed reducer of the rotating electric machine in any of the means 1, 2, 3, and 4 is provided so as to include a planetary gear.
"Means 6" A drum driving method using a rotating electric machine, wherein the speed reducer of the rotating electric machine is provided in a structure of a harmonic reduction body in the means 1, 2, 3, or 4.
"Means 7" A method of driving a drum by a rotating electric machine according to any one of the means 1, 2, 3, 4, and 5, 6, wherein the rotating electric machine and the deceleration portion are provided inside the drum.
"Means 8" In the means 1 and 4, the rotating body is a rotary table instead of the drum.
"Means 9" In means 1, 2, 3, 4, and 5, torque transmission gears meshing with the rotor gear at n locations are provided at n locations, and torque is transmitted from the n locations to gears provided concentrically with the output drum. A drum driving method using a rotating electric machine, wherein the drum is decelerated. Here, an integer of n ≧ 2.
"Means 10" In means 1, 2, 3, 4, and 5, a torque transmission gear meshing with a rotor gear at n places is provided so as to be reduced by k stages at n places. A method of driving a drum by a rotating electric machine, wherein n positions are kept constant and torque is transmitted from n positions to gears provided concentrically on an output drum to reduce the speed.
Here, n is an integer of 2 or more, and k is 2 or 3.
[0005]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings. One embodiment of the first invention is shown in FIGS. 1 is a side sectional view, and FIG. 2 is a front view. (1) is a so-called hybrid stator structure in which a stator axis is also a magnetic yoke, and (2) two permanent magnets are sandwiched between two stator iron cores in a sandwich manner. Is shown. (2) has a slot, the coil (4) is wound, and the outer periphery of (2) has a plurality of teeth, also called inductors, at each main pole, and through an air gap, (5) It faces the outer rotor having a large number of teeth of equal pitch on the inner circumference. (6) is a support that supports (5) and is rotatable together with (7). A bearing (8) is supported by (1). The torque of (6) is transmitted to the planet gear (9). (9) is held by the carrier (11) via the shaft (10). (9) rotates the drum which meshes with the internal gear (12) (13). (13) is supported by the fixed shaft (15) via the bearing (14). Part of (15) is provided with a groove or the like, and leads (16) of the coil (4) are drawn out.
Although the speed reducer has been described as the planetary gear body (6) having a sun gear as the output part, the planetary gear body (9) rotates and revolves. The carrier (11) is fixed to (15), and (12) can be driven even if (9) is operated only by rotation. Further, (9) and (12) may be rollers that transmit friction torque from gears.
[0006]
The outer rotor type rotating electric machine shown in FIG. 1 particularly has a large number of rotor teeth and can have many poles, so that a low speed and a large torque can be obtained, so that the reduction ratio of the speed reducer can be reduced. In general, the rotation unevenness becomes worse as the speed becomes lower. However, even at the same 300 rpm, for example, when the number of rotor poles of the rotating electric machine is 4 or 100, the latter has a much better value.
In the case of the present inductor type stator structure, since it can be easily configured to about 100 poles, the rotation unevenness can be sufficiently reduced at about 300 rpm, and 60 rpm can be obtained with a small rotation unevenness even with a 1/5 speed reducer. The rotor may be a cylindrical permanent magnet whose inner periphery is alternately magnetized with N poles and S poles having the same number of pole pairs as the number of teeth of the rotor.
[0007]
FIG. 3 is a sectional view of the present invention in the case of an inner rotor. (21) is a stator, (22) is a coil, (23) is a lead wire, and (24) is a rotor. The support (25) supports (21), and the bearing (26) also supports the rotor shaft (27). The pinion gear (28) is fixed to (27), and torque is transmitted to the planetary gear (29). Since the gear (36) is fixedly fastened to (29), it revolves around the shaft (30) supported by the carrier (31), revolves around (27), and (32) Rotating drum. The drum (32) is rotatably supported by the fixed plate (34) and the fixed shafts (35) on both sides by bearings (26) and (33).
The drum may be rotated by fastening (31) to (25) and setting (29), (36) and (30) to rotate only.
[0008]
Naturally, if the adduction type rotary electric machine of FIG. 3 is of a hybrid inductor type as shown in FIG. 1, the reduction ratio of the speed reducer can be reduced, but the rotary electric machine of the structure of FIG. Even if the child rotational speed is high, a two-stage reduction planetary gear as shown in FIG. 3 is possible because the reduction ratio can be sufficiently increased. Further, the gear may be the friction roller type described above.
As compared with FIG. 1, FIG. 3 has disadvantages in that the fixed shaft (35) is provided at two points from both sides, and it is difficult to form a single shaft as shown in FIG.
Further, the two-stage deceleration as shown in FIG. 3 can be used not only for the inner rotor type but also for the outer rotor type.
Further, in FIG. 3, the pinion and the like transmit the torque to the output external gear which is arranged concentrically with the 32 drums with 30 as the axis center, but the torque is also transmitted to the internal output gear as 12 in FIG. May be. Although the structure becomes complicated if necessary, three-stage deceleration is also possible.
[0009]
Although the number of the planetary gears of the speed reducer is two in FIG. 2, the number of the planetary gears is increased to three, four, and n to improve the transmission torque strength, and the backlash can be reduced by devising an assembling method. That is, three pieces reduce engagement at the time of meshing from two pieces. For example, since three pieces are meshed at equal 120 ° positions, they are further meshed from unequal positions to further reduce the looseness. It can be smaller.
[0010]
FIG. 4 is a sectional view showing a side view of a harmonic type (so-called harmonic type) speed reducer incorporated in a drum, and FIG. 5 is a front view of the harmonic type speed reducer. (41) shows the case of the outer rotor type rotating electric machine, but the illustration of the internal configuration is omitted. With (15) as a fixed axis, (41) rotates, the carrier (42) fastened to it rotates, and the roller (44) revolves around the shaft (43) while rotating, and the wave spline ( 45) Rotate while ironing the inner circumference. (45) is made of a flexible metal or resin and has teeth on its outer periphery. The internal gear 46 meshes with the internal gear 46, and the number of teeth is usually larger in the case of 46 than in the case of about 2 teeth (45). For example, if the number of teeth is 100 and 102, the reduction ratio is 2/100 = 1/50, and a large reduction ratio can be obtained. In addition, since a plurality of teeth are always meshed, the backlash is almost zero. Since (46) is fixed, (45) is decelerated and its rotation is transmitted to the drum (13). (45) and (46) can be formed at a low cost by a resin molding method. In this case, since the reduction ratio is large, the rotating electric machine can obtain the drum speed of the copying machine with a simple configuration even at a rotation speed of about 2000 rpm. In the case of this harmonic deceleration, the rotating electric machine may be an inner rotating electric machine.
In this case, by setting the axial length of 45 to be at least 0.5 times the inner diameter of 45, which is sufficiently large, it is possible to eliminate the rotation unevenness caused by the 45 distortion motion.
[0011]
The present invention is not limited to the drum drive, but is most suitable for, for example, low-speed drive and positioning drive of a turntable. Since the turntable has a large inertia, direct drive without using a speed reducer has a disadvantage that the inertia is easily affected at the time of starting or stopping. In the case of the present invention, since the rotating electric machine and the deceleration unit have the same axis, they are compact and can reduce the speed of a plurality of planets, so that the transmission strength is large and the backlash can be reduced.
[0012]
For example, in FIG. 1, torque is transmitted from two locations to the output portion. Generally, torque transmission gears meshing at n locations are provided at n locations, and torque is transmitted from the n locations to gears provided concentrically with the output drum. If the speed is reduced, the transmission torque can be increased, and the backlash can be reduced as described above. However, n is often selected from 2 to 4 for economic reasons.
[0013]
Further, a torque transmission gear meshing with the above-mentioned rotor gear at n locations is provided so as to be reduced by k stages at n locations, and the gear positions of the k-stage reduction unit and the tooth positions of the pinion are kept constant, and n gears are maintained. It is also possible to transmit torque from n locations to concentric gears to reduce the speed. k is usually desirably 2 for economic reasons. For example, if n teeth positions between (29) and (36) in FIG. 3 are kept constant, the speed reducer can be assembled and a speed reducer with small backlash can be obtained. If the positions of the teeth between (29) and (36) are not constant among n, if n is 3 or the like, it becomes impossible to assemble due to interference between the gears (28) to (32) and (36). become. If the positions of the teeth between (29) and (36) in FIG. 3 are set at a certain angle and n pieces are kept constant at a certain value, a speed reducer with almost zero backlash can be obtained. .
Further, at this time, when torque is transmitted to the 120-degree position from three places by planetary gears, it is not sufficient to keep all three tooth positions between (29) and (36) constant. In this case, it is necessary to select the number of teeth of (29) and (36) to be a multiple of three. Otherwise, the assembly will be impossible due to interference between the gears. Therefore, in the case of n pieces, it is selected to be an integral multiple of n.
[0014]
【The invention's effect】
1) By decelerating the outer rotor type rotating electric machine with a planetary gear or a harmonic type, the rotating electric machine and the deceleration unit are built in the drum, and the driving unit and the rotating unit can be constituted by a common shaft, which is simple and simple. A drive system for high-precision rotation unevenness becomes possible.
2) By making the outer rotor type stator an inductor type, the rotating electric machine itself can reduce the reduction ratio from 1/25 of the conventional to approximately 1/5 due to low speed and large torque and low rotation unevenness. Can be decelerated.
With a planetary gear configuration, the speed can be reduced to about 1/5, and a simple configuration is possible.
Conversely, despite the simple structure and the small number of parts, the harmonic gear can be greatly reduced to about 1/50, and the backlash is almost zero because a plurality of teeth are meshed at all times.
By reducing the speed of a general inner rotor type rotating electric machine with a planetary gear or a harmonic type, the rotating electric machine and the deceleration unit can be built in the drum and configured. It becomes possible.
Since the rotating shaft of the rotating electric machine and the rotating shaft of the drum are arranged on the same straight line, the torque of the rotating electric machine output can be transmitted to the drum drive gear without taking up any space. Even if the transmission torque is small, it can be large and backlash can be reduced.
[Brief description of the drawings]
1 and 2 are structural views of a first embodiment of the present invention. FIG. 3 are structural views of a second embodiment of the present invention. FIG. 4 and FIG. 5 are explanatory views of another embodiment of the present invention. Diagram for explaining the principle of technology [Explanation of reference numerals]
1 Stator axis,
2 stator core 3 permanent magnet,
4 coils,
5 outer rotor,
6, 7 bracket,
8 bearings,
9 planet gear,
10 axes,
11 career,
12 internal gear,
13 drums,
14 bearings,
15 Fixed shaft 16 Lead wire 21 Stator 22 Coil 23 Lead wire 24 Rotor 25 Support body 26 Bearing 27 Rotor shaft 28 Pinion gear 29 Planetary gear 30 Axis 31 Carrier 32 Drum 33 Bearing 34 Fixed plate 35 Fixed axis 36 Planetary gear 41 Outer rotor Type rotating electric machine 42 Carrier 43 Shaft 44 Roller 45 Wave spline 46 Internal gear 51 Rotating electric machine 52 Pinion gear 53 Output shaft 54 Reduction gear 55 Pinion gear 56 Reduction gear 57 Output gear 58 Drum shaft 59 Drum

Claims (12)

In a rotating electric machine in which an outer rotor rotates concentrically with a stationary shaft having a stator, a drum is arranged so that its rotating shaft is concentric with the outer rotor rotating shaft, and an outer periphery is provided on an inner periphery or a side surface of the drum. A method of driving a drum by a rotating electric machine, wherein rotation of a rotor is transmitted via a speed reducer. 2. The method according to claim 1, wherein at least one of the drums is rotatably supported by a stationary shaft of the rotating electric machine via a bearing. In a rotating electric machine in which an outer rotor rotates concentrically with a stationary hollow shaft having a stator, a drum is arranged so that its rotating shaft is concentric with the outer rotor rotating shaft, and the drum is provided on the inner periphery or side surface of the drum. The rotation of the outer rotor is transmitted via a speed reducer, and a shaft is passed through the hollow portion of the rotating electric machine, and the rotation support of at least one drum is supported on the shaft by a stationary shaft of the rotating electric machine via a bearing. Drum drive method by rotating electric machine. By transmitting the torque of the output of the rotating electric machine to the inner periphery or side surface of the drum by reducing the output of the inner rotor type rotating electric machine so that the rotation axis of the drum is concentric with the axis of the rotating electric machine. Drum drive method using rotating electric machine. 5. The method according to claim 1, wherein the speed reducer of the rotating electric machine includes a planetary gear. 5. A drum driving method by a rotating electric machine according to claim 1, wherein the speed reducer of the rotating electric machine is provided in a configuration of a harmonic type speed reducing body. 7. A method of driving a drum by a rotating electric machine according to claim 1, wherein the rotating electric machine and the decelerator are provided inside the drum. 5. The rotary table according to claim 1, wherein the rotating body is a rotary table instead of the drum. Claims 1, 2, 3, 4, and 5, wherein n torque transmission gears meshing with the rotor gear at n locations are provided, and torque is transmitted from the n locations to gears provided concentrically with the output drum to reduce the speed. A drum driving method using a rotating electric machine. Here, an integer of n ≧ 2. The torque transmission gear meshing with the rotor gear at n locations is provided so as to reduce the speed by k stages at n locations, and the gear positions of the gear and the pinion of the k stage reduction unit are fixed. A method of driving a drum by a rotating electric machine, wherein the torque is decelerated by transmitting torque from n places to gears provided concentrically on an output drum while maintaining n pieces of gears.
Here, n is an integer of 2 or more, and k is 2 or 3. 7. A drum driving method using a rotating electric machine according to claim 6, wherein at least the wave spline of the harmonic reduction body is made of resin, and the effective length in the axial direction is 0.5 times or more the average inner diameter of the sliding portion. The torque transmission gear meshing with the rotor gear at n locations is provided so as to reduce the speed by k stages at n locations, and the gear positions of the gear and the pinion of the k stage reduction unit are fixed. In a drum driving method using a rotating electric machine that maintains torque by transmitting torque from n locations to gears concentrically provided on an output drum while maintaining n gears, the number of teeth of gears and pinions of the k-speed reduction unit is n A drum driving method using a rotating electric machine, wherein the drum driving method is an integer multiple of.
Here, n is an integer of 2 or more, and k is 2 or 3.

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