JP2007129839A - Brake-incorporated rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brake-incorporated rotating electric machine that can easily perform maintenance work, such as in-machine inspection and part replacements, and can prevent friction burn-out of a brake and wraparound of the brake to an armature coil side. <P>SOLUTION: A main shaft 1 of the rotating electric machine is pivotally supported to a curved frame 2, a curved rotor yoke 5 for the combination use of a brake drum is connected to the shaft end of the main shaft so as to be facing in reverse to the frame and arranged accommodatingly inside the frame, magnetic field permanent magnets 6 are dispersedly arranged on the internal peripheral face of the rotor yoke so as to face the stator core 3 arranged inside the rotor yoke, and the electromagnetic brake 7 is mounted to the frame so as to face the external peripheral face of the rotor yoke. The rotor yoke 5 is divided into a boss 5a, adhered firmly to the main shaft and a yoke 5b detachably fastened to the rim of the main shaft with bolts 10, and a seal part 12 of a labyrinth structure is formed between the external peripheral edge of the yoke 5b and the internal side face of the frame 2 that faces the external peripheral edge. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a brake built-in rotary electric machine intended for a brake motor applied to applications such as conveyors and hoist hoists.

As a brake motor described above, a saddle-shaped rotating body that serves as both a rotor yoke and a brake drum of an electric motor is connected to a shaft of a main shaft that is supported by a motor frame, and a permanent magnet that faces the stator core is provided on the outer peripheral side of the rotating body. A configuration is known in which a motor field pole is disposed, and an electromagnetic brake is disposed on the inner side of the rotating drum as a braking surface of the brake drum (see, for example, Patent Document 1). As shown in FIG.
2 (a) and 2 (b), 1 is the main shaft of the motor, 2 is a bowl-shaped frame with one open end, 3 is a stator core disposed on the inner peripheral surface of the frame 2, 4 is an armature coil, 5 is A cast iron rotor yoke having an L-shaped cross section that also serves as a brake drum, 6 is a permanent magnet for a field distributed on the outer peripheral surface of the rotor yoke 5 so as to face the stator core 3, and 7 is an inner periphery of the rotor yoke 5. An electromagnetic brake disposed on the inner side of the surface (braking surface of the brake drum), 8 is an end plate disposed on the open end surface of the frame 2, 9 is a bearing, and the rotor yoke 5 serving also as a brake drum is connected to the frame 2 It is accommodated and arranged on the inner side of the frame side wall with the orientation aligned, and at this position, it is shrink-fitted and coupled on the axis of the main shaft 1.
JP 2005-151731 A

By the way, the brake motor of the assembly structure shown in FIG. 2 has the feature that the outer shape can be reduced compared with the conventional brake motor in which the rotor and the electromagnetic brake part of the motor are arranged on the main shaft, but on the other hand, maintenance is performed. The following issues remain in gender.
That is, the braking operation accompanying the repeated operation and stop of the motor wears the brake shoe 7a of the electromagnetic brake 7 and the inner peripheral surface of the rotor yoke 5 functioning as a brake drum. 7 brake shoe 7a and rotor yoke 5 need to be replaced.
In this regard, in the conventional assembly structure shown in FIG. 2, the electromagnetic brake 7 can be removed from the frame 2 together with the end plate 8 to perform inspection and part replacement operations relatively easily. The rotor drum 5 also serving as a brake drum cannot be pulled out easily, and a large-scale motor disassembly work is required for inspection and parts replacement. In addition, after completion of the brake motor product, the permanent magnet 6 may be replaced with a magnet having a different magnetic force characteristic to change the motor output. However, as described above, the rotor yoke 5 cannot be easily removed in the conventional structure. Therefore, it is not possible to easily replace the permanent magnet parts.

Further, during the braking operation of the electromagnetic brake 7, wear powder (dust) is generated due to sliding of the inner peripheral surface of the rotor yoke 5 / brake shoe 7a. However, with the conventional structure, the dust generated in the machine remains on the outer peripheral side of the rotor yoke 5. There is also a problem in that it wraps around and deposits on the armature coil 4 to reduce the dielectric strength of the coil.
The present invention has been made in view of the above points, and its purpose is to solve the above-mentioned problems and easily perform maintenance work such as in-machine inspection and parts replacement without requiring a large disassembly work. An object of the present invention is to provide a brake-equipped rotating electrical machine having an improved assembly structure that can effectively prevent the wear powder of the brake from turning around to the armature coil side.

In order to achieve the above object, according to the configuration of the present invention, the main shaft is pivotally supported by a saddle-shaped frame whose one end face is open, and a saddle-shaped rotor yoke serving also as a brake drum is attached to the shaft end of the main shaft. The rotor permanent yoke is dispersedly arranged on the inner peripheral surface of the rotor yoke so as to face the peripheral surface of the stator core supported by the frame. The electromagnetic brake is installed on the inner peripheral surface of the bowl-shaped frame so as to face the outer peripheral surface of the first frame.
In addition to the above structure, the rotor yoke is divided into a disc-shaped boss portion fixed to the main shaft and an annular yoke portion having an L-shaped cross section that is detachably coupled to the periphery of the boss portion. The yoke portion is coupled to the portion (claim 2).
Furthermore, a labyrinth seal portion is formed between the outer peripheral edge of the rotor yoke and the inner wall surface of the frame facing the rotor yoke.

As described above, with respect to the main shaft that is pivotally supported by the saddle-shaped frame, a saddle-shaped rotor yoke that also serves as a brake drum is connected to the shaft end in the opposite direction to the frame, and the stator core and permanent magnet are placed on the inner peripheral side of the rotor yoke. In addition, the configuration in which the electromagnetic brake is arranged on the outer peripheral side facilitates maintenance of the brake part requiring frequent maintenance and inspection in conjunction with the thinning of the outer shape.
In addition to the above structure, the rotor yoke is divided into a disk-shaped boss portion fixed to the main shaft and a disk-shaped yoke portion having an L-shaped cross section that is detachably coupled to the periphery of the boss portion, so that maintenance can be performed. While the boss part remains on the main shaft, the yoke part with a worn braking surface can be replaced without requiring a large disassembly work, and the permanent magnet attached to the rotor yoke can be replaced with a magnet with a different magnetic property. Remodeling when changing the specifications of can be easily handled.
Furthermore, by forming a labyrinth seal between the outer peripheral edge of the rotor yoke and the inner wall surface of the frame facing the rotor yoke, the gap between the frame side wall and the rotor yoke and the peripheral edge facing the frame side wall is formed. It is possible to prevent wear powder generated by the braking operation of the electromagnetic brake from entering the armature coil side and prevent insulation deterioration of the coil, thereby improving long-term reliability.

Hereinafter, an embodiment of the present invention will be described based on the example shown in FIG. In the illustrated embodiment, members corresponding to those in FIG.
That is, in the configuration of the illustrated embodiment, the hook-shaped rotor drum 5 serving also as a brake drum is connected to the shaft end (the anti-load side) of the main shaft 1 in a posture opposite to the hook-shaped frame 2 with one end face open. Has been. Here, the rotor yoke 5 is divided into a disc-shaped boss portion 5a that is shrink-fitted to the main shaft 1 and an annular yoke portion 5b having an L-shaped cross section, and the yoke portion 5b is formed on the periphery of the boss portion 5a. It fits into the formed step and is fastened and fixed via a bolt 10.
On the other hand, unlike the conventional structure of FIG. 2, the stator core 3 is fitted and supported on the peripheral surface of the bearing support 11 fixed to the side wall of the frame 2 and is opposed to the stator core 3 with a gap therebetween. The permanent magnets 6 are distributed on the inner peripheral surface of the rotor yoke 5. Although not shown in the figure, the individual permanent magnets 6 are fitted in predetermined positions by being fitted into axial wedge-shaped grooves formed on the inner peripheral surface of the rotor yoke 5.

Further, the electromagnetic brake 7 is disposed on the outer peripheral side of the rotor yoke 5 contrary to the conventional structure of FIG. 2, and the brake shoe 7 a is opposed to the outer peripheral surface (braking surface) of the rotor yoke 5 on the inner peripheral surface of the frame 2. is set up.
Further, a flange-like projection is formed on the peripheral edge of the yoke portion 5b of the rotor yoke 5, and an annular groove is formed on the inner surface of the side wall of the frame 2 so as to oppose the projection. And the labyrinth seal portion 12 is formed.
With the above assembly structure, the bolt 10 is loosened from the open end face side of the saddle-shaped frame 2 so that the yoke portion 5b can be removed while the boss portion 5a of the rotor yoke 5 remains on the main shaft 1, thereby allowing the outer peripheral brake to be maintained during maintenance. The parts of the yoke portion 5b whose surface is worn can be easily replaced.

Further, even when the permanent magnet 6 mounted on the inner peripheral surface of the yoke portion 5b is replaced with a magnet having a different magnetic force characteristic, the yoke portion 5b can be removed and replaced easily as described above.
In addition, as described above, the labyrinth seal portion 12 separates the outer peripheral side of the rotor yoke 5 on which the electromagnetic brake 7 is disposed and the inner peripheral side of the rotor yoke 5 on which the stator core 3 is disposed. It is possible to effectively prevent the problem that the abrasion powder generated by the braking operation of the electromagnetic brake 7 goes around the inner peripheral side of the rotor yoke 5 and adheres and accumulates on the armature coil 4.

Side view sectional drawing showing the assembly structure of the brake built-in rotary electric machine by the Example of this invention It is a figure showing the internal structure of the conventional brake electric machine with built-in brake, (a) is a longitudinal front view, (b) is the side view

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main axis | shaft 2 Vertical frame 3 Stator core 4 Electric machine coil 5 Rotor yoke used also as a brake drum 5a Boss part 5b Yoke part 7 Electromagnetic brake 9 Bearing 10 Bolt 11 Bearing support 12 Labyrinth seal part

Claims (3)

The main shaft is supported on a saddle-shaped frame with one end face open, and a saddle-shaped rotor yoke that also serves as a brake drum is connected to the shaft end of the main shaft in the opposite direction to the frame so as to be accommodated in the frame. Thus, permanent magnets for field are distributed and arranged on the inner peripheral surface of the rotor yoke so as to face the peripheral surface of the stator core supported by the frame, and electromagnetic waves are formed on the inner peripheral surface of the bowl-shaped frame so as to face the outer peripheral surface of the rotor yoke. Brake built-in rotary electric machine characterized by installing a brake. In the rotating electrical machine according to claim 1, after dividing the rotor yoke into a disc-shaped boss portion fixed to the main shaft and an annular yoke portion having an L-shaped cross section detachably coupled to the periphery of the boss portion, A brake built-in type rotating electric machine, wherein a yoke part is coupled to a boss part. The rotating electrical machine according to claim 1 or 2, wherein a labyrinth seal is formed between an outer peripheral edge of the rotor yoke and an inner wall surface of the frame facing the rotor yoke.

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