TY - JOUR
T1 - Development of a Coil Driver for Magnetic Manipulation Systems
AU - Kaya, Mert
AU - Sakthivel, Uthvag
AU - Khalil, Islam S.M.
AU - Misra, Sarthak
PY - 2019/8/13
Y1 - 2019/8/13
N2 - Pulsewidth modulation (PWM) is the most commonly used technique to drive electromagnetic coils in magnetic manipulation systems. Relatively low PWM frequencies generate high-magnitude current ripple and magnetic field fluctuation. In this letter, coils are powered by a driver at PWM frequencies close to their self-resonant frequencies to generate high-frequency magnetic fields and minimize current ripple and magnetic field fluctuation. In order to protect the driver against the penetration of stray electromagnetic and magnetic fields, a multilayer shielding enclosure is employed. The coil driver is used to study the effect of varying PWM frequencies on current, magnetic field, and ohmic loss using Helmholtz, air, and iron core coils. The current ripple magnitude is significantly minimized when the coils are driven at PWM frequencies close to their self-resonant frequencies. This results in reduction of magnetic field fluctuation and provides more accurate measurement of magnetic field magnitude. Our experiments show that increasing the PWM frequency from 100 Hz to 25 kHz decreases the current ripple and magnetic fluctuation by two orders of magnitude, with a negligible effect on the ohmic loss.
AB - Pulsewidth modulation (PWM) is the most commonly used technique to drive electromagnetic coils in magnetic manipulation systems. Relatively low PWM frequencies generate high-magnitude current ripple and magnetic field fluctuation. In this letter, coils are powered by a driver at PWM frequencies close to their self-resonant frequencies to generate high-frequency magnetic fields and minimize current ripple and magnetic field fluctuation. In order to protect the driver against the penetration of stray electromagnetic and magnetic fields, a multilayer shielding enclosure is employed. The coil driver is used to study the effect of varying PWM frequencies on current, magnetic field, and ohmic loss using Helmholtz, air, and iron core coils. The current ripple magnitude is significantly minimized when the coils are driven at PWM frequencies close to their self-resonant frequencies. This results in reduction of magnetic field fluctuation and provides more accurate measurement of magnetic field magnitude. Our experiments show that increasing the PWM frequency from 100 Hz to 25 kHz decreases the current ripple and magnetic fluctuation by two orders of magnitude, with a negligible effect on the ohmic loss.
KW - coil drive
KW - current ripple minimization
KW - Electromagnetics
KW - magnetic field fluctuation
KW - ohmic loss
KW - pulsewidth modulation
KW - 22/4 OA procedure
UR - http://www.scopus.com/inward/record.url?scp=85070939959&partnerID=8YFLogxK
U2 - 10.1109/LMAG.2019.2935050
DO - 10.1109/LMAG.2019.2935050
M3 - Article
AN - SCOPUS:85070939959
SN - 1949-307X
VL - 10
JO - IEEE Magnetics Letters
JF - IEEE Magnetics Letters
M1 - 8795522
ER -