JPH073821Y2 - Brushless gear motor - Google Patents

Description

[Detailed Description of the Invention] Industrial field of application The present invention is a main drum drive source for a copying machine, a printer, or the like.
In addition, the present invention relates to a brushless gear motor used as a drive source for various OA equipment.

2. Description of the Related Art In recent years, gear motors have been used as drive sources for copiers and printers, and as copiers and printers have become smaller,
There is a demand for a small and compact gear motor incorporated therein.

An example of the conventional gear motor described above will be described below with reference to the drawings.

FIG. 5 is a sectional view showing the structure of a conventional gear motor and a diagram showing the relationship between a drive control circuit for controlling the motor. Fifth
In the figure, reference numeral 1 is a laminated stator made of laminated silicon steel plates and having a slot opened inside, and a copper wire being wound around the slot. Reference numeral 2 denotes a permanent magnet that is magnetized in multiple poles in the radial direction, and is fixed by adhesion to a rotating shaft 3 that is geared at the tip. The rotor composed of the rotating shaft 3 and the permanent magnet 2 is supported by a bearing 5 fitted in the center of the non-output side bracket 4 and a bearing 7 fitted in the output side bracket 6 and is free to rotate. Bracket 6
Has a box shape with a central portion scooped out, and has a structure for accommodating a gear assembly for decelerating the rotating shaft 3 in the central portion and supports the laminated stator 1 and the permanent magnet 2.
The counter output side bracket 4 is fixed to the output side bracket 6 by a stator fixing screw 8.

Next, the gear assembly will be described.

Reference numeral 9 is a gear plate A, 10 is a gear plate B that also serves as an attachment angle to the set, and 11 is a column that supports the gear plate A and the gear plate B in parallel. 12 is the first car gear, 13 is the output gear, 14 is the output shaft, 15 is the bearing metal A that supports the first car gear, and 16 is the bearing metal B that supports the output shaft 14. Reference numeral 17 is a gear plate mounting screw for fixing the above gear assembly to the output side bracket 6.

A drive control circuit that controls the motor configured as above to a constant speed is required.
Was connected to the substrate 20 composed of the drive control circuit 19 by using, and the motor section forming the gear and the drive control circuit section forming the control circuit were independent of each other.

Problems to be Solved by the Invention However, in the above configuration, since the gear motor section and the drive control circuit section are independent of each other, it is necessary to mount each of them in order to incorporate them into the set, and to drive them. There was the trouble of having to prepare a space for mounting the control circuit.

Further, since the gear motor section and the drive control circuit section must be connected by a plurality of lead wires, there is a problem that the work efficiency in motor assembly is poor.

In view of the above problems, the present invention provides a limited space for the gear motor for housing the drive control circuit, integrates the motor and the drive control circuit, and eliminates the need for connecting lead wires or the like.

Means for Solving the Problems In order to solve the above problems, a brushless gear motor according to the present invention comprises a brushless motor having a box portion surrounding a gear assembly and a bracket made of a cylindrical portion holding a bearing, and a rotating shaft center. The drive control circuit arranged on the opposite side of the box part near one side and the brushless motor part and the drive control circuit are wired and fixed to the bottom part of the box part of the bracket between the gear assembly and the brushless motor. It is composed of a printed circuit board.

With the above-described structure, the present invention brings the gear assembly closer to one side from the center of the motor shaft and the box portion housing the gear assembly in the same direction, and the brushless motor is placed in the space on the upper surface of the motor portion on the opposite side. The drive control circuit for drive control is arranged, and the wiring of this drive control circuit and the wiring of the brushless motor (the terminal treatment of the stator winding and the wiring of the position detection element) are performed on the same printed circuit board. By fixing it to the bottom of the box portion by screwing or the like, a gear portion having the same shape as the circular brushless motor and a drive control circuit are incorporated. As a result, the motor with built-in gear and the drive control circuit are separated from each other, making it easy to install in a set that was inconvenient to handle, and lead wires that connect the motor and drive control circuit are no longer required, greatly improving workability. And a compact brushless gear motor is provided.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show the structure of the brushless gear motor according to the first embodiment of the present invention. FIG. 1 is a sectional view and FIG. 2 is a top view. 1 and 2
In the figure, 21 is a gear plate A, 22 is a gear plate B, 23 is an output shaft, 24 is a metal that rotatably supports the output shaft 23, and 25 is a column that supports the gear plate A21 and the gear plate B22 in parallel. Has become. 26 is a gear plate mounting screw for fixing the whole gear assembly to the box part of the bracket, 27 is a mounting boss for mounting the entire geared motor to the set, a metal boss of iron thread having sufficient strength to support the motor, and the center Parts with tapped parts are fixedly arranged in three places.

Next, the structure of the brushless motor will be described.
The bracket 28 is a substantially box-shaped box portion 28A for accommodating the gear assembly, and a cylindrical portion in which a hole for burying the lower bearing 30 and the upper bearing 29 is precisely machined at the center of the motor.
It consists of 28B. The inner ring of the upper and lower bearings 29, 30 has a rotating shaft 31
Is inserted, the rotor boss 32 is fixed to the rotating shaft 31 by press fitting, etc., and a cup-shaped rotor frame 33 made of a magnetic material.
A cylindrical permanent magnet 34 magnetized in the radial direction with multiple poles is fixed inside. Further, the rotor frame 33 is fixed to the rotor boss 32 by a rotor fixing screw 35.

Next, the stator section will be described. Reference numeral 36 denotes a laminated stator made of laminated silicon steel plates and having a slot opened to the outside, and a stator winding 37 wound around the slot. This laminated stator 36, a ring-shaped spacer 38, and a disk-shaped print. The substrate 39 is inserted with reference to the outer peripheral surface of the central bearing housing cylindrical portion 28B of the bracket 28 and is fixed to the bottom surface of the box portion 28C by a fixing screw 40. On the printed circuit board 39, the connection of the position detection element 41 that detects the rotational position of the rotor portion and the connection of the end of the stator winding 37 are made, and at the same time, the wiring of the drive control circuit 42 is made. 43 is an insulating paper that insulates the drive control circuit 42 from the stator winding 37.

The brushless motor configured as above is a position detection element
The stator winding 37 of each phase is sequentially energized by 41,
Rotational torque is generated in the cylindrical permanent magnet 34. The rotation torque of this permanent magnet 34 is the same as that of the rotating shaft 31 with the gear processing on the tip.
To the output shaft 23.
The rotation torque is transmitted to.

As described above, according to the present embodiment, the box portion 28A of the bracket 28 is brought closer to one side of the rotary shaft 31, and the drive control circuit 42 is arranged in the space on the opposite side of the rotary shaft 31. Wiring and position detection element 41 and stator winding 37
The terminals are wired on the same printed circuit board 39, and this printed circuit board 39 is fixed to the bottom of the box portion 28A of the bracket 28 together with the laminated stator 36, thereby eliminating the need for lead wires connecting the motor and the drive control circuit. It is possible to provide a compact brushless gear motor in which the workability in assembling is significantly improved and a gear portion having the same shape as a circular motor and a drive control circuit are incorporated.

Another object of the present invention will be described below with reference to the drawings.

FIG. 3 is a top view with the gear assembly removed, and FIG. 4 is a partial cross-sectional view showing the relationship between the drive control circuit and the bracket. 44 is an input / output connector for controlling the motor from the outside, 45 is a discrete component of the drive control circuit, and 46 is a chip component of the drive control circuit. A printed circuit board 39 connects the drive control circuit component and the position detection element 41.

In the above configuration, a discrete component of the drive control circuit
45 is arranged on the gear part side in a region other than the box part 28A of the bracket, and the chip component 46 of the drive control circuit is arranged together with the position detection element 41 on the motor part side. Therefore, the printed board 39 only needs to have a printed pattern formed on one surface (on the side of the chip component), so that an inexpensive brushless gear motor can be provided.

As described above, according to the present invention, the box portion for accommodating the gear assembly is moved to one side of the motor shaft, and the drive control circuit is arranged in the space on the upper surface of the motor portion on the opposite side. And the wiring of the brushless motor section (terminal processing of the stator winding and wiring of the position detection element) are done on the same printed circuit board, and this printed circuit board is fixed to the bottom of the box section together with the laminated stator to drive the motor. It is possible to provide a compact brushless gear motor that has a built-in gear part and drive control circuit of the same shape as a circular motor, because it does not require lead wires connecting the control circuit and greatly improves workability in motor assembly. ,
Its practical effect is enormous.

In addition, by configuring the drive control circuit with discrete parts and chip parts, arranging the discrete parts in the area other than the box part of the bracket on the gear side, and arranging the chip parts together with the position detection element on the motor side, Since it is sufficient to form the conductive thin pattern on only one surface (chip component side) of the substrate, an inexpensive brushless gear motor can be provided.

[Brief description of drawings]

1 is a sectional view of a brushless gear motor according to an embodiment of the present invention, FIG. 2 is a top view of FIG. 1, FIG. 3 is a top view showing the relationship between a drive control circuit and a bracket, and FIG.
FIG. 5 is a partial sectional view, and FIG. 5 is a sectional view of a conventional gear motor. 28 …… Bracket, 31 …… Rotary shaft, 36 …… Layered stator, 39 …… Printed circuit board, 42 …… Drive control circuit.

Claims (1)

[Scope of utility model registration request] 1. A gear assembly having a deceleration function, a brushless motor for generating torque, and a drive control circuit for driving and rotating the brushless motor. The brushless motor holds a box portion and a bearing surrounding the gear assembly. A bracket composed of a cylindrical portion, a rotary shaft for transmitting a motor torque to the gear assembly, a laminated stator, a cup-shaped rotor frame, and permanent magnets magnetized in multiple poles in the radial direction. The drive control circuit is arranged in a space on the opposite side of the rotary shaft while being brought closer to one side of the rotation axis, and the printed circuit board forming the wiring between the brushless motor and the drive control circuit is provided between the gear assembly and the motor. Brushless gear motor fixed to the bottom of the box.