Auxiliary Inverter Motors

Medha's 3 Phase AC motors with built-in inverters are designed using a DSP (Digital Signal Processor) for control and IGBT semiconductor power devices in inverter. These AC Motor-Inverter combinations are a good retrofit alternative for failure prone and high maintenance DC Motors used for the same functions in older locomotives. The Inverter takes DC supply from locomotive batteries and provides required sinusoidal supply to 3-phase AC motors.

Three types of motors are used for different functions in the locomotive.

1. 1.5 HP Fuel Pump Motor with pump.
2. 0.87 HP Dust Exhauster Blower Motor with blower.
3. 0.5 HP Crank Case Blower Motor with blower.

These inverter motors are protected for input under voltage, input over voltage, output overload, output short circuit, input reverse polarity, over temperature. Surge protection as per IEC 571.
Inverter module is divided into two sections.