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On the energy optimized control of standard and high-efficiency induction motors in CT and HVAC applications

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5 Author(s)
Abrahamsen, F. ; Inst. of Energy Technol., Aalborg Univ., Denmark ; Blaabjerg, F. ; Pedersen, J.K. ; Grabowski, P.Z.
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This paper contains an analysis of how the choice of energy optimal control of induction motors is influenced by motor construction, standard versus high-efficiency motor, and by application, constant torque (CT) and heating, ventilation, and air conditioning (HVAC) (interpreted as vector and scalar motor drives). The analysis is made with a 2.2 kW voltage-source-inverter-fed squirrel-cage motor drive as an example throughout the paper, but through statistics on the use of motors and their efficiencies, the conclusions are widened to a broader range (0-50 kW). Energy optimal control strategies are reviewed and cos(ϑ) control, a model-based control, and a search control are implemented in the laboratory in a vector and a scalar motor drive. The convergence speed for the strategies and their ability to reject disturbances are investigated by experiments. It is also shown experimentally that, for both standard and high-efficiency motors, motor energy-efficiency improvement is achievable by energy optimal control below 60% load torque. The energy savings using energy optimal control strategies are measured on a pump system with a certain load cycle. Model-based control is recommended for CT applications and cos(ϑ) control for HVAC applications

Published in:

Industry Applications, IEEE Transactions on  (Volume:34 ,  Issue: 4 )

Date of Publication:

Jul/Aug 1998

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