Circuit structure for controlling band-type brake of elevator traction machine by using PTC

Abstract

The invention discloses a circuit structure for controlling a band-type brake of an elevator traction machine by using a PTC, which comprises a band-type brake control switch, a diode and a follow current resistor, and is characterized in that a band-type brake coil is connected to the output end of a band-type brake control circuit through the band-type brake control switch; the negative electrode of the diode is connected to the connecting end of the band-type brake control switch and the band-type brake braking coil, the positive electrode of the diode is connected with one end of the follow current resistor, the other end of the follow current resistor is connected to the other end of the band-type brake braking coil, and the PTC is connected to the follow current resistor in parallel. The change relation between the impedance and the temperature of the PTC is nonlinear, and the equivalent resistance value of the follow current resistor of the band-type brake is changed by utilizing the characteristic of the positive temperature coefficient of the PTC.

Description

technical field [0001] The invention relates to the technical field of brake control of an elevator traction machine, in particular to a circuit structure using a PTC to control the brake of an elevator traction machine so as to generate noise when controlling the brake of the traction machine. Background technique [0002] Noise will be generated when the traction machine locks the brake. The reason for the noise is that the brake device contacts the wheel surface of the traction sheave. The speed of the braking device is related to the freewheeling resistance in the braking circuit. Therefore, by controlling the freewheeling resistance, the noise can be effectively controlled. However, reducing the freewheeling resistance in order to reduce the noise will lead to the problem that the speed of the brake will be slowed down and the traveling distance after the brake will be too long. If the resistance value of the freewheeling resistor is fixed, it is inevitable to strike ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to solve the problem that the speed of the brake is slowed down and the walking distance after the brake is too long caused by the noise generated when the brake of the traction machine is controlled by the resistance value of the freewheeling resistor and the current In the prior art, the first freewheeling resistance of the brake freewheeling circuit needs to be turned on and off by the closing control signal when the brake starts to be released and the open circuit control signal after the brake shoe hits the wheel surface of the main engine, which has complex control circuits and high cost. Provide a simple structure and low cost circuit structure using PTC to control the brake of the elevator traction machine

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