Elevator door motor switch-in-place torque control method and elevator door motor device

Abstract

The invention discloses an elevator door motor switch-in-place torque control method which comprises the following steps: calculating the synchronization frequency f of a motor and integrating the synchronization frequency f to obtain a coordinate conversion angle theta; calculating an M-axis voltage Um corresponding to an expected torque under an M-T rotating coordinate system; calculating a T-axis voltage Ut corresponding to the expected torque under the M-T rotating coordinate system; performing PARK inverse transform according to the T-axis voltage Ut, the M-axis voltage Um and the coordinate conversion angle theta so as to obtain a voltage under a two-phase static coordinate; performing space vector pulse duration modulation on the voltage under the two-phase static coordinate so as to obtain 6 paths of driving signals; and outputting the 6 paths of driving signals to the motor after passing through an intelligent power module, thus obtaining the expected torque. The torque control method provided by the invention can be used for adjusting the motor torque randomly as required, therefore the method can be used for controlling the heating value of the motor during door motor switch-off maintaining and door motor switching-on maintaining; and in addition, because of open-loop control, coders for vector control are not required, thus the device provided by the invention is simple in structure.

Description

【Technical field】 [0001] The invention relates to the field of elevator door machines, in particular to a method for controlling the door opening and closing torque of an elevator door machine. 【Background technique】 [0002] In the field of elevator door operators, the motor generally does not have a special heat dissipation device, so the heat dissipation effect of the motor is very poor, especially when the door operator is in the position of opening and closing the door and the motor is blocked, the heat dissipation effect of the motor is even worse. Motor heating is a very serious problem. In mild cases, it will affect the performance of the motor, and in severe cases, it may burn out the motor. One of the main factors affecting the heating of the motor is the size of the motor current, which is not only related to the load, but also has a lot to do with the inverter used for the door machine. [0003] Most of the frequency converters used in elevator door machines are...

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Problems solved by technology

Vector control type special inverter for door machine needs an external encoder signal, but the encoder increases the cost of the system and also becomes a point of failure of the system

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