Back emf is the generator output of a motor, and so it is proportional to the motor's angular velocity ω ω size 12{ω} {}.It is zero when the motor is first turned on, meaning that the coil receives the full driving voltage and the motor draws maximum current when it is on but not turning.. Back emf in electric motors. When something like a refrigerator or an air conditioner (anything with a motor) first turns on in your house, the lights often dim momentarily. To understand this, realize that a spinning motor also acts like a generator. A motor has coils turning inside magnetic fields, and a coil turning inside a magnetic field.
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Back emf is a situation called self inductance and occurs in electrical motors. It results in power loss that is unavoidable, since it is a result of physics.. The back emf is represented as a variable emf that opposes the one driving the motor. Back emf is zero when the motor is not turning, and it increases proportionally to the motor's angular velocity. Back emf is the generator output of a motor, and so it is proportional to the motor's angular velocity ω ω. It is zero when the motor is.
