What are the types of elevator motors?

Abstract:What are the types of elevator motors? 1) According to […]

What are the types of elevator motors?

1) According to the power supply:

There are two categories of AC elevator motors and DC elevator motors. As the drive motor that drives the traction machine or elevator load, it belongs to the type of motor, and its power supply is also divided into two categories: AC and DC.

AC elevator motors are basically asynchronous (induction) motors, so the rotor speed is also lower than the speed of the stator's rotating magnetic field called synchronous speed.

The stator power supply of the AC elevator motor is basically three-phase, but the voltage is divided into various types; such as 220V, 380V, 420V, 440V, etc., most of which are 380V. The frequency of the AC power supply is the power frequency, but there are often two types: 50Hz and 60Hz.

2) According to the braking method, there are two types: with brake and without brake.

These two types of motors are generally AC elevator motors. Motors without brakes are often used as brake windings by multi-pole windings, while the braking of DC elevator motors is realized by circuit control. AC elevator motors with brakes, brakes The windings are often supplied with direct current.

3) According to the ventilation mode, there are two types with fan and without fan.

At present, common elevator motors, whether AC or DC, are basically equipped with dedicated fans to achieve forced ventilation and are controlled by thermal switches.

Old-fashioned elevator motors generally do not have fans, or even ordinary three-phase asynchronous motors. 4) According to the structure, there are two types: those with a machine base and those without a machine base: Generally, DC elevator motors have a machine base, and the machine base It is necessary to have good magnetic permeability, so the steel material can be cast steel, or it can be bent and welded with steel plates. For AC elevator motors, the stator is basically a circular structure stator, with an organic shell (seat ), self-fan cooling. Generally, the volume is relatively large. The stator adopts an octagonal stator, and the AC elevator motor is divided into two categories according to its rotor structure: cast aluminum structure and copper strip structure. There are also two types of intermediate short-circuit rings and intermediate short-circuit rings.

After adopting the intermediate short-circuit ring, good performance has been achieved for the three running parts of the elevator motor: starting, running and braking. The intermediate short-circuit ring was originally a novel structure of the traction motor. After it was introduced into the elevator motor, satisfactory results were obtained.

According to the bearing structure: there are two types of rolling bearing structure and sliding bearing type bearing. Generally, DC elevator motors use rolling bearings. After the AC elevator motor adopts the sliding bearing, the bearing noise is greatly reduced, thereby reducing the motor noise.

According to the motor winding structure, there are several types of single winding, double winding and multi winding.

Elevator operation is an advanced form of motor speed regulation, in order to meet the characteristic requirements of tortoise ladder operation. At present, double and multi-winding structures are often used, but from the perspective of efficiency, it still has shortcomings. Using single winding and bipolar modulation scheme, the efficiency can be improved and the energy saving effect is good, but pay attention to the sinusoidal shape of the magnetic field. Minimize harmonic components.

According to generality: there are Y series asynchronous motors, which are basically elevator motors of general structure. There are two types of elevator motors, which are basically different in structure from Y series asynchronous motors.

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