The elevator's power system accelerates the start of the Elevator, operates at a steady speed, and braking deceleration plays a controlling role. The pros and cons of the power system directly affect the starting of the elevator, brake acceleration and deceleration, leveling accuracy, and comfort of the ride. Elevator Manufacturers mainly have the following types of power when manufacturing elevators, which will be introduced one by one below.
The AC voltage regulation and speed control system started faster but was not stable. Therefore, thyristors can be used instead of braking resistors and reactors to control the starting and braking currents and realize closed-loop control of the system. Speed feedback is usually used. During operation, whether the elevator running speed meets the requirements of the ideal speed curve is constantly checked to achieve the purpose of braking comfort and smooth operation. This kind of system has no low-speed crawling time, so that the total transport efficiency of the elevator is greatly improved. Moreover, the floor can be controlled directly within +-10 mm when the brake is directly stopped by the distance. Elevators with adjustable speed and speed are often divided by braking methods. There are several types of energy-saving braking, thyristor voltage regulation and speed control plus DC energy consumption braking, and eddy current brake speed regulation system.
The speed range of the variable pole speed control system is small, because increasing the number of poles of the motor excessively increases the external dimensions of the motor significantly. According to the number of motor poles, it is divided into fast Winding and slow speed winding, fast winding is used as starting and steady speed, and slow speed winding is used as braking and slow speed parking.
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