TY - GEN
T1 - Efficiency of VFD Coupled Induction Motors Operating in the Scalar Mode with Different Types of Loads
AU - Latchoomun, L.
AU - Gokhool, C.
AU - Ah King, R. T.F.
AU - Busawon, K.
AU - Barbot, J. P.
PY - 2019
Y1 - 2019
N2 - In this paper, we investigate the behaviour of scalar controlled AC Variable Frequency Drives for induction motors when coupled with different types of loads. It is well known that slip is more pronounced at high speeds rather than low speeds in loads such as in pumps and fans operation because the torque load varies as the square or cube of the speed. Slip compensation in Voltage/Frequency controlled Variable Frequency Drives may work only up to a certain limit since the problem can be exacerbated by overcompensation causing low magnetisation flux of the stator and the Variable Frequency Drive becomes uncontrollable. In this research work, we investigate the behaviour of the motor and Variable Frequency Drive assembly with regards to slowly changing loads from low to high speeds. Results show that at reduced speeds for the Variable Frequency Drive and motor assembly, the efficiency is lowest for square and cubic torques loads compared to linear and constant torque loads. Highest efficiency and torque are achieved only in a restricted interval of speed. This problem therefore compels us to avoid using the Variable Frequency Drives in the Voltage/Frequency mode at low speeds for pumps and fans.
AB - In this paper, we investigate the behaviour of scalar controlled AC Variable Frequency Drives for induction motors when coupled with different types of loads. It is well known that slip is more pronounced at high speeds rather than low speeds in loads such as in pumps and fans operation because the torque load varies as the square or cube of the speed. Slip compensation in Voltage/Frequency controlled Variable Frequency Drives may work only up to a certain limit since the problem can be exacerbated by overcompensation causing low magnetisation flux of the stator and the Variable Frequency Drive becomes uncontrollable. In this research work, we investigate the behaviour of the motor and Variable Frequency Drive assembly with regards to slowly changing loads from low to high speeds. Results show that at reduced speeds for the Variable Frequency Drive and motor assembly, the efficiency is lowest for square and cubic torques loads compared to linear and constant torque loads. Highest efficiency and torque are achieved only in a restricted interval of speed. This problem therefore compels us to avoid using the Variable Frequency Drives in the Voltage/Frequency mode at low speeds for pumps and fans.
KW - Direct Torque Control (DTC)
KW - Field Orientated Control (FOC)
KW - Pulse Width Modulation (PWM)
KW - Variable Frequency Drive (VFD)
KW - Vectorial Flux Control (VFC)
UR - https://www.scopus.com/pages/publications/85065923854
U2 - 10.1007/978-3-030-18240-3_5
DO - 10.1007/978-3-030-18240-3_5
M3 - Conference contribution
AN - SCOPUS:85065923854
SN - 9783030182397
VL - 561
T3 - Lecture Notes in Electrical Engineering
SP - 45
EP - 59
BT - Smart and Sustainable Engineering for Next Generation Applications - Proceeding of the Second International Conference on Emerging Trends in Electrical, Electronic and Communications Engineering ELECOM 2018
A2 - Fleming, Peter
A2 - Jakobsson, Andreas
A2 - Lacquet, Beatrys Margaretha
A2 - Sanei, Saeid
A2 - Deb, Kalyanmoy
PB - Springer
T2 - 2nd International Conference on Emerging Trends in Electrical, Electronic and Communications Engineering, ELECOM 2018
Y2 - 28 November 2018 through 30 November 2018
ER -