back emf

Related to back emf: Lenz's law

back emf

n
(Electronics) electrical engineering an electromagnetic force appearing in an inductive circuit in such a direction as to oppose any change of current in the circuit
References in periodicals archive ?
Han, "Torque ripple reduction in BLDC torque motor with nonideal back EMF," IEEE Transactions on Power Electronics, vol.
Stable operation and control of BLDC motor (with trapezoidal back EMF profile) necessitate the current commutation in windings to be synchronized with instantaneous rotor position.
3) Sensing of the third harmonic of the back EMF. 4) Detecting the freewheeling diode conduction and related extended strategies.
Klasnic, "Stationary Frame Induction Motor Feed Forward Current Controller With Back EMF Compensation," Energy Conversion, IEEE Transactions, vol.
During high-speed operations, the Back EMF (BEMF) produced by the motor must be below the maximum DC voltage of the drive's power bus.
Reed relays contain a reed switch, a coil for creating a magnetic field, an optional diode for handling back EMF from the coil, and an encapsulating package with connection terminals.
Tenders are invited for Micro Ohm Meter Model Lr-2045-S4 - 1/2 Digit Micro Meter Ohm Meter With Back Emf Protection Along With Following Accesseries 1 3 Meter Lead Along With Gp Kevin Clip , 2 .Ac Mains Chord, 3.
But in low speed region and flux weakening region, the estimated values of the currents and back EMF cannot help as they have large ripples.
To reduce THD of back EMF, fractional slot shorted pitch distribution windings are used in [10, 11].
11 gives the calculated back EMF waveforms (Phase-A) when rotor rotating at 150 rpm, which demonstrated that electric power can be generated by the electromagnetic coupling between the PMs and both windings.
The sensorless motors rely on a controller that will measure the back EMF from unenergized coils to determine rotor position.
Thus, this algorithm adds sensorless control algorithms based on the observation of back emf.