Abstract
Energy-efficient industrial drives and control systems are designed to minimize power consumption. Energy consumption is associated with the efficiency of energy conversion in electric motors. In the paper the nonintrusive efficiency estimation method for induction cage motor was shown. The implementation of the method was based on the air-gap torque method. The results were compared with those obtained with the classical air-gap torque method. The authors present a significant impact of estimation of mechanical power losses in the engine on the accuracy of estimating the coefficient of efficiency cage induction motor. Ill. 7, bibl. 24, tabl. 3 (in English; abstracts in English and Lithuanian).http://dx.doi.org/10.5755/j01.eee.114.8.696
Highlights
Squirrel-cage induction motors are used in many industrial applications. Their advantages such as low price and low failure rate has caused the expansion of these machines in many industries compared to other types of electrical machines
According to equation (1) and (11) to designate the squirrel-cage induction motor efficiency coefficient η it is needed to determine the values of electromagnetic torque Tag, rotational speed n of the motor shaft, the value of friction and windage power losses ΔPm and value of rotor stray load loss ΔPdodr
The second estimation method of efficieny coefficient is marked as solid line – number 2
Summary
Squirrel-cage induction motors are used in many industrial applications. Their advantages such as low price and low failure rate has caused the expansion of these machines in many industries compared to other types of electrical machines. According to the equation (3) measurement of voltages and currents can be reduced to measuring these value in two phases only In this way the number of measuring instruments needed to be installed on the supply side of the motor could be limited. The motor power P2 is calculated as follows This method is characterized high accuracy depending on the class of precision measuring instruments used [8]. According to equation (1) and (11) to designate the squirrel-cage induction motor efficiency coefficient η it is needed to determine the values of electromagnetic torque Tag, rotational speed n of the motor shaft, the value of friction and windage power losses ΔPm and value of rotor stray load loss ΔPdodr. Rotor speed n depends on the frequency f of supply voltage and the motor shaft torque T.
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