A climbing assist control method, system and frequency converter

Abstract

The embodiment of the invention discloses a climbing power assistance control method, a system and a frequency converter which are used for automatic identification of a movement direction of a climber and can reduce the cost of a climbing power assistance control system. The method comprises the steps that the frequency converter controls alternating voltage generated by a three-phase stator winding of a motor; a forward rotation magnetic field and a reverse rotation magnetic field that have alternated actions are generated in an air gap of the motor; the motor keeps a static state; the frequency converter obtains an initial power-factor angle of the motor by the action of the forward rotation magnetic field and the reverse rotation magnetic field; the frequency converter obtains the current power-factor angle of the motor; the frequency converter determines the movement direction of the climber according to the current power-factor angle and the initial power-factor angle and controls the motor to provide a lifting moment according to the movement direction of the climber.

Description

technical field [0001] The invention relates to the technical field of automation control, in particular to a climbing assist control method, system and frequency converter. Background technique [0002] In workplaces where vertical climbing is required, climbers need to overcome their own gravity and continue to do work in order to move upward and downward. When the climbing time is long, a lot of physical strength is required. Therefore, the climbing booster system came into being, such as the wind tower booster system, the motor is fixed at the bottom of the booster ladder, the motor drives the cable to rotate, and the cable moves up and down through the fixed pulley fixed on the top of the booster ladder. When climbing, the buckle on the safety equipment is connected to the cable, and the motor drives the cable connected to the buckle on the safety equipment of the climber to provide lifting force for the climber to realize the function of weight-reducing ladder. [000...

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Problems solved by technology

[0005] (1) The cost of the climbing booster system in Scheme 1 is relatively high. After careful analysis by the inventor, the main reason for the high cost is that the sensor for direction detection is installed in the booster system, and after installing the sensor, the It will lead to complex system solutions, which will increase the points of failure and reduce system reliability.

[0006] (2) The climbing experience and comfort of the climbing assist system of the second scheme are relatively poor. After careful analysis by the inventor, the reason for the above-mentioned defects is: when speed control is adopted, during the climbing process, the climbing personnel are required to The climbing or descending speed of the climber is consistent with the speed of the motor preset by the inverter, but it is known in actual operation that the climbing or descending speed of the climber cannot be constant, which will cause the lifting torque of the motor to change continuously, and the lifting The torque is suddenly large or small, which makes the experience and comfort of climbers poor

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