Asynchronous motor with braking equipment

Abstract

The asynchronous motor with brake device is composed of stator winding, rotor and end cover. There is a brake device composed of friction disc, iron suction, spring and friction plate inside the motor. The friction disc is formed by stamping steel plate. Out of the bevel lugs, the cast aluminum motor rotor aluminum ring is made with bevel wedges. The angle of the cast aluminum bevel wedges is basically the same as the angle of the bevel lugs of the friction disc. The friction disc is connected to the suction iron, which is made of soft Made of magnetic materials, it is characterized in that there is a large heat dissipation space (H) between the magnet and the friction disc, and is mainly used for various garden electric tools, such as lawn mowers, tree branch grinders, etc.

Description

technical field [0001] The invention relates to an asynchronous motor, especially an asynchronous motor with a braking device, which brakes quickly after the power supply of the motor is cut off, so that the rotor of the motor stops completely in a short time. The asynchronous motor with braking device of the present invention is mainly used in various garden electric tools, such as lawn mowers and branch shredders. Background technique [0002] Usually after the motor is powered off, the motor needs to continue to rotate for a period of time due to the inertia effect, such as garden tools such as lawn mowers, must stop in a short time, otherwise it may cause injury to the operator, so this kind of motor is equipped with There are brakes to brake, such as EP0136282 and CN2574292Y each disclose a kind of asynchronous motor with a brake device. A friction disc is installed on the rotor. The disc presses on the friction plate, and when the motor is energized, a magnetic field ...

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of these kinds of brake devices is that the friction disc and the magnetic conducting ring cover the outer circle of the rotor aluminum ring, resulting in poor heat dissipation of the motor, and due to the size limit of the outer circle of the rotor aluminum ring, only very thin soft magnetic materials can be used to make the friction Disk, so the magnetic field generated when the motor is energized has a smaller suction force on the friction disk, so only a smaller spring can be used to make the braking force smaller. It is usually used for small power motors. If it is a larger power motor, It is necessary to install friction discs at both ends, and for the friction disc to have a certain thickness, the rotor aluminum ring is changed to a smaller size, which leads to a larger resistance of the motor rotor aluminum ring, which affects the performance of the motor.

Images