Apr 8, 2010 · The back EMF is only (nearly) equal to the supply when the motor is running at it's speed (for that given voltage). It's the back EMF that sets the speed for a particular voltage, …

Feb 21, 2025 · Hey, @Tonyr1084. Back EMF control is simple in principle. When the rotor of the motor spins, it induces a reverse current into the coils as they cut the B fields. By using the …

Apr 15, 2019 · I have confusion about back emf in motors. I mean I know that winding of a motor is actually inductor and when magnetic field changes on it, it creates a back emf . But also it is …

Dec 10, 2018 · The left diagram is correct. When shut off, the coils in the motor generate a voltage in opposite polarity to the supply. Protection or snubber diodes are installed across the …

Aug 30, 2022 · Hello all, I’ve been looking online and have seen in places using the back EMF of a coil to charge a capacitor, using circuits similar to what is seen below. My question is of …

Mar 11, 2017 · Hi, I'm investigating a circuit based on diodes, for protecting a mosfet switch from back emf due to transformer leakage inductance (in lieu of a snubber). The basic idea is to (a) …

May 1, 2024 · How much back EMF volts can I get from positive 35v DC on+ off, at 6 amps DC , to inductor 1.75 millihenry to 10 ohms resistance to ground? I need = > 100volt over the …

Jun 8, 2020 · Hello all. I am experiencing back EMF from a 12v mag lock. I have read that you can use a diode to help prevent this, however all of the 12v diodes that I'm finding are 5 watt. If …

Jan 7, 2018 · Question, is there a method for measuring an electric motor's back EMF without having to technically switch it off? For instance, a common technique when applying PWM to a …

Jun 25, 2023 · Hello, I want to protect a capacitor bank from back emf, I have read that they use an anti-parallel diode and another a varistor or MOV and another both. The bank is 4800uF at …