This is a brief demonstration of the way increasing mechanical load causes any electric motor to slow, producing more torque to match that demand. As the motor slows, back EMF is reduced, resulting in a higher voltage drop across the motor and an increase in amperage draw. This is the power the motor needs to maintain a steady state. Unfortunately when the motor is slowed, cooling across the fins of the blower resistor is reduced, and higher amp draw increases waste heat, which will eventually destroys the blower resistor, connectors, or the motor itself. In any motor with signs of increasing current and overheating, you want to do all you can to fix any source of mechanical resistance. If the blower resistor has failed, don't forget to clean the motor intake and housing. #shorts
2 мар 2022
