Traction machine for elevator

Abstract

The invention discloses a traction machine for an elevator. The traction machine for the elevator comprises a motor, a collecting ring assembly, a fixed frame and a rotary frame. The collecting ring assembly comprises a plurality of conducting rings and a plurality of electric brushes. Each electric bush mutually contacts each corresponding conducting ring. The fixed frame comprises a fixed machine seat and a main shaft. The main shaft and the fixed machine seat are connected fixedly with each other. An electric brush installing part is arranged on the fixed frame. The plurality of electric brushes are arranged fixedly on the electric brush installing part. A rotor coil of the motor is connected electrically with the electric conducting ring through an electric conductor. The function of delivering electric power to the rotor coil is achieved by the conducting ring, the electric brushes and the electric conductor. According to the traction machine for the elevator, permanent magnetic steel with high cost is saved and cost of the traction machine is reduced obviously. The electric brushes and the conducting rings are arranged near the hollow portion of the main shaft so that inner space of the traction machine is fully used, the axial thickness of the complete machine is reduced so that the complete machine is thinned and applicable to an elevator with a small motor room or no motor room and the like and with requirement of thin traction machine.

Description

technical field [0001] The invention relates to an elevator driving device, in particular to an elevator traction machine. Background technique [0002] At present, the commonly used gearless traction machines for elevators generally realize the rotor excitation through permanent magnets. Such as figure 1 Shown is a gearless permanent magnet synchronous traction machine for elevators disclosed in Chinese invention patent ZL02111952.X. A permanent magnet is installed on the yoke of the rotor of the traction machine to realize rotor excitation. [0003] Since the permanent magnets satisfying the magnetic properties contain rare earth materials and are expensive, the cost of the traction machine is also high. Moreover, with the increase in the use of permanent magnets and the reduction in the stock of rare earth material resources, the price of permanent magnets will become higher and higher. [0004] In order to reduce costs, a synchronous traction machine (or synchronous m...

AI Technical Summary

Problems solved by technology

However, arranging the brushes and conductive rings at the shaft extension end will increase the axial thickness of the whole machine; and when the rotor rotates, the brush powder generated by the friction between the brushes and the conductive rings will easily invade the bearing and the inner coil of the motor , damage the bearing and easily cause a short circuit in the internal coil of the motor

Although relevant measures have been taken to block the intrusion of brush powder, there are still problems that cannot be solved fundamentally.

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