JP5280036B2 - Drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving device capable of outputting torque adequate for moving a movable member even when it is miniaturized in the radial direction, and reducing manufacturing costs. <P>SOLUTION: This driving device 1 feeds power to a shaft 2, which is the movable member, with a plurality of rotors 3, 5 and a plurality of stators 4, 6. One rotor 3 adjacent in the axial direction is fixed to the shaft 2 directly, and the other rotor 5 is fixed to the shaft 2 by being connected to the rotor 3 via a rotor connector 7 arranged between the rotor 3 and itself. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a drive device, and more particularly to a drive device that moves a movable member of a machine tool to perform angle indexing and the like.

2. Description of the Related Art Conventionally, for example, a drive device that performs angle determination of a table of a machine tool has been required to output a sufficient torque for moving a movable member.
However, when the movable member is heavy, it is necessary to use a large driving device in the radial direction in order to output a sufficient torque.
By using a large driving device in the radial direction, there is a disadvantage that the driving device is increased in size and weight in the radial direction.
On the other hand, in order to avoid an increase in the size and weight of the drive device, if a small drive device is used in the radial direction, sufficient torque cannot be obtained and it takes time to move the movable member, and the movable member is accelerated or decelerated. Inconveniences such as inability to occur occur and work efficiency deteriorates.

Therefore, as in JP-A-7-110714, a control method for driving the same movable member (same axis) with a plurality of motors has been proposed.
The plurality of motors supply power to the movable member in a state where the position, speed, and torque are digitally controlled.
JP-A-7-110714

  By the way, the control method as described above requires a control device for controlling torque among a plurality of motors, and there is a problem that the manufacturing cost of the drive device increases by the amount of the control device.

  In view of the above, an object of the present invention is to provide a drive device that can output a torque sufficient to move a movable member even if it is downsized in the radial direction, and can reduce the manufacturing cost.

In order to solve the above problems, a drive device according to claim 1 is a drive device that supplies power to a shaft by a plurality of rotors and a plurality of stators, and includes two rotors adjacent in the axial direction as one set. The rotor is directly fixed to the shaft, and the other rotor is fixed to the shaft by being connected to one rotor via a rotor connecting body provided between the rotors. It has two opposing ring parts and a plurality of pillars erected between these ring parts, so that one rotor and the other rotor are fixed by bolts on both sides of the ring part. The axial distance between the two wheel portions is substantially equal to the length of the bolt in the long axis direction.

In the drive device according to claim 2 , the plurality of stators have the same shape, and are provided with a connection portion where the connection extends, and a pair of adjacent stators are in a state in which the connection portions face each other in the axial direction. It is what is arranged in.

In the drive device according to claim 3 , when the number of rotors is an odd number, one rotor that is not paired is fixed directly to the shaft, or one rotor that is not paired is connected to the other rotor. It is fixed to the shaft by further coupling with the other rotor via a rotor coupling body provided therebetween.

According to the drive device of the first aspect, the other rotor can be fixed to the shaft without newly providing a portion for fixing the other rotor to the shaft via the rotor coupling body.
As a result, power can be supplied to the shaft, which is a movable member, by the plurality of rotors and the plurality of stators, so that the drive device that has been reduced in size in the radial direction can output sufficient torque.

In addition, since the number of rotations of one rotor and the other rotor becomes the same by the rotor coupling body, one rotary encoder for measuring the number of rotations of the drive device can be provided for two adjacent rotors. The drive device can be made inexpensive and a sufficient torque can be output.
Furthermore, since one rotor and the other rotor are connected by the rotor connecting body, it is possible to prevent generation of torsional stress in the shaft.
As a result, there is no need to control the current supplied to the connected motors, so that the driving device can be made inexpensive and a sufficient torque can be output.

Since one rotor and the other rotor are connected to each other by a rotor coupling body at the time of assembly, the interval between the ring portions of the rotor coupling body must be long enough to allow the bolt to be inserted.
According to the drive device of the first aspect , the interval between the two wheel portions in the axial direction is substantially equal to the length of the bolt in the long axis direction, so that the interval between the ring portions of the rotor coupling body can be minimized.
Thereby, the axial length of the drive device can be shortened, and the drive device can be miniaturized.

According to the drive device of claim 2 , since the adjacent sets of stators are arranged in a state where the respective connection portions face each other in the axial direction, the connection is extended from a close position, and adjacent to each other. The stator connection can be easily routed in the driving device.

According to the drive device of the third aspect , even when the number of rotors is an odd number, the rotor that has not been assembled is fixed to the shaft, so that a sufficient torque can be output.
In addition, by further connecting one rotor that has not been assembled to the other rotor via a rotor coupling body, the number of rotary encoders can be reduced, and torsional stress can be generated in the shaft. Can be prevented.
As a result, there is no need to control the current supplied to the connected motors, so that the driving device can be made inexpensive and a sufficient torque can be output.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
Throughout the drawings, the same reference numerals indicate the same or corresponding parts.
In the present embodiment, the drive device 1 having two rotors and two stators will be described.

As shown in FIG. 1, the driving device 1 includes a shaft 2 as a movable member, a first rotor 3 as one rotor fixed to the shaft 2, and a second rotor as the other rotor adjacent in the axial direction. 5, a rotor coupling body 7 provided between the first rotor 3 and the second rotor 5, a first stator 4 arranged around the first rotor 3, and a circumference around the second rotor 5. The second stator 6 and the rotary encoder 8 for detecting the rotation amount of the shaft 2 are included.
A pair of two first rotors 3 and second rotors 5 adjacent to each other in the axial direction is set.

The shaft 2 is provided with a flange portion 21 in the circumferential direction.
Bolt holes for fixing the first rotor 3 to the flange portion 21 are formed in the flange portion 21, and the first rotor 3 is directly fixed to the flange portion 21 of the shaft 2 with bolts 9.

A rotor coupling body 7 is fixed by bolts 9 on the side opposite to the flange portion 21 in the axial direction of the first rotor 3.
A second rotor is fixed by bolts 9 on the side opposite to the first rotor 3 in the axial direction of the rotor coupling body 7.
That is, the flange portion 21, the first rotor 3, the rotor coupling body 7, and the second rotor 5 are arranged in this order in the axial direction, and the second rotor 5 is fixed to the shaft 2 via the rotor coupling body 7 and the first rotor 3. Has been.

As shown in FIG. 2, the rotor coupling body 7 includes two ring parts 71, 72 that face each other in the axial direction, and a plurality of column bodies 73 that are installed between the ring part 71 and the ring part 72. Have.
A plurality of bolt holes 74 through which the bolts 9 are inserted are respectively formed in the ring part 71 and the ring part 72.
The first rotor 3 is fixed to the ring portion 71 by the bolt 9, and the second rotor 5 is fixed to the ring portion 72 by the bolt 9.

The distance in the axial direction between the ring portion 71 and the ring portion 72 is substantially equal to the length of the bolt 9 in the long axis direction.
When assembling the drive device 1, the first rotor 3 and the second rotor 5 are coupled by the rotor coupling body 7 with the bolt 9, and therefore the distance between the ring portions 71, 72 of the rotor coupling body 7 is such that the bolt 9 can be inserted. Is required.
In the rotor connection body 7 of the present embodiment, the axial distance between the ring portion 71 and the ring portion 72 is made substantially equal to the length of the bolt 9 in the long axis direction, so that the ring portions 71 and 72 of the rotor connection body 7 The interval can be minimized.

The 1st stator 4 and the 2nd stator 6 have the same shape, and have the connection parts 41 and 61 from which the connection lines 42 and 62 each extend.
The first stator 4 and the second stator 6 are arranged in a state where the connection part 41 and the connection part 61 face each other.

The rotor coupling body 7 couples the first rotor 3 and the second rotor 5 in a state where the rotor coupling body 7 is disposed in a space formed by connecting the connection portions 41 and 61 to each other.
In addition, since the first stator 4 and the second stator 6 are arranged in a state where the respective connection portions 41 and 61 face each other in the axial direction, the connection 42 and 62 extend from a close position, and the connection 42 and This makes it easy to route the motor 62 in the drive unit.

  In this embodiment, the case where there are two rotors and stators in the drive device has been described. However, the present invention is not limited to this. For example, there may be two or more rotors and stators in the drive device.

  When the number of rotors is an odd number, one rotor (not shown) that is not paired is fixed directly to the shaft 2 or via a rotor coupling body provided between the second rotor 5 and the rotor. Then, it is fixed to the shaft 2 by further connecting with the second rotor 5.

  By further connecting one rotor, which was not in a set, to the second rotor 5 via a rotor coupling body, the number of rotary encoders 9 can be reduced and torsional stress is generated in the shaft 2 Can be prevented.

It is sectional drawing which shows the drive device of one Embodiment of this invention. It is a perspective view which shows the rotor connection shaft of FIG.

DESCRIPTION OF SYMBOLS 1 Drive device 2 Shaft 3 1st rotor 4 1st stator 5 2nd rotor 6 2nd stator 7 Rotor coupling body 8 Rotary encoder 9 Bolt 21 Flange part 41 Connection part 42 Connection 61 Connection part 62 Connection 71 Ring part 72 Ring part 73 Column 74 Bolt hole

Claims (3)

A drive device for supplying power to a shaft with a plurality of rotors and a plurality of stators,
A set of two rotors adjacent in the axial direction, with one rotor fixed directly to the shaft,
The other rotor is fixed to the shaft by connecting with one rotor via a rotor connecting body provided between the one rotor and
The rotor coupling body includes two ring portions that are opposed to each other in the axial direction and a plurality of pillars that are spanned between the ring portions. The rotor is fixed by a bolt, and the axial distance between both wheels is substantially equal to the length of the bolt in the long axis direction . The plurality of stators have the same shape and are provided with a connection portion where the connection extends, and a pair of adjacent stators are arranged in a state where the connection portions face each other in the axial direction. The drive device according to claim 1 . When the number of rotors is an odd number, one rotor that is not paired is fixed directly to the shaft, or one rotor that is not paired is provided between the rotor and the other rotor. drive device according to claim 1 or 2, characterized in that fixed to the shaft by further connected to the other rotor through.

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