Control system for cooling fan of traction motor of locomotive

Abstract

The invention discloses a control system for a cooling fan of a traction motor of a locomotive, belonging to the technical field of locomotive control. In the invention, operating current of the traction motor is used for controlling revolving speed of the cooling fan of the traction motor, and a current sensor is added in a DC / AC main inverter, so as to connect the current sensor with a main inverter controller of the DC / AC main inverter. By using the control system for the cooling fan of the traction motor of the locomotive, the revolving speed of the cooling fan of the traction motor can be controlled precisely in short time, the auxiliary power consumed by the cooling fan of the traction motor can be greatly reduced, and the maintenance of the whole system is more convenient.

Description

technical field [0001] The invention relates to a cooling fan control system, in particular to a control system for a locomotive traction motor cooling fan. Background technique [0002] Traditionally, there are three types of control systems for cooling fans of locomotive traction motors. The first control system is figure 1 As shown, the diesel engine is directly connected to the cooling fan to control the cooling fan of the traction motor of the locomotive. The control method of this device is relatively simple, but there are the following disadvantages: 1. When the locomotive is being pulled at low speed, although the power consumed by the locomotive is small and the speed of the diesel engine is low, the air volume of the cooling fan of the traction motor of the locomotive mechanically driven by the diesel engine is small, but the traction of the locomotive The working current of the motor is large, so the temperature of the motor is high, which will easily cause the ...

AI Technical Summary

Problems solved by technology

The control method of this kind of device is relatively simple, but there are the following disadvantages: 1. When the locomotive is being pulled at low speed, although the power consumed by the locomotive is small and the speed of the diesel engine is low, the air volume of the cooling fan of the traction motor of the locomotive mechanically driven by the diesel engine is small, but the traction of the locomotive The working current of the motor is large, so the temperature of the motor is high, which will easily cause the insulation of the traction motor of the locomotive to age quickly, resulting in a shortened service life of the traction motor of the locomotive; 2. When the locomotive is parked and the diesel engine is idling, the diesel engine must also drive the traction motor of the locomotive to cool down Fans, individuals waste a lot of energy

But it also has the following disadvantages: when the locomotive is being pulled at low speed, although the power consumed by the locomotive is small and the diesel engine rotates at a low speed, the frequency and voltage of the three-phase AC power generated by the auxiliary alternator driven by the diesel engine is low, and the cooling fan speed of the traction motor of the locomotive is low. Therefore, the air volume of the cooling fan of the locomotive traction motor is small, but the working current of the locomotive traction motor is large, so the temperature of the motor is high, which will easily cause the insulation of the locomotive traction motor to age quickly, resulting in shortened service life of the locomotive traction motor

But it also has the following disadvantages: 1. The temperature sensor that detects the stator core temperature in the traction motor is deeply buried in the stator core of the traction motor. Once the sensor is damaged, it cannot be replaced, so that the cooling fan of the traction motor cannot be controlled. Therefore The quality of the sensor must be absolutely reliable, but it is impossible for any part to be 100% reliable; 2. The temperature sensor can detect the temperature of the stator core of the traction motor after the heating temperature rises, so for the stator cable of the traction motor , the time from the operation of the traction motor to the detection of the temperature rise by the temperature sensor is relatively lagging in time, so there is still the disadvantage that the insulation of the stator cable of the traction motor is easily aged and the service life of the traction motor is shortened

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