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11:00am - 11:20am ID: 1568 / C-06: 5 Paper for Compressor Engineering Conference
Single-Phase Induction Motor Design Optimization for Hermetic Rotary Compressor in Heat Pump Water Heating Applications
Osmar Pinheiro, Jônatas Lacerda, Lino Marco
Tecumseh do Brasil Ltda., Brazil
Energy efficient household appliances and substitution of fossil fuels in heating systems are a constant matter took in the development of new technologies. An example is the shift of water heating systems from fuel burning equipment towards hermetic rotary compressors powered by the electrical power system. The hermetic compressors original application is in air conditioning systems, where air is the objective for cooling and heating, now, in this new application, the thermal load changes for water, requiring an adaptation of the compressor operating envelope. The hermetic compressor operating envelope is the range of evaporating and condensing temperatures, that translates into the electrical motor torque requirements. The electrical motor is also required to work with a voltage range from power supply, that changes in each country and each state, and affect the motor design. The electrical motor type is a single-phase induction motor with an aluminum squirrel cage rotor, with a permanent split-capacitor (PSC) connection. This type of motor changes significantly its behavior with the power supply voltage variation. In this work is presented the new application envelope and the motor design optimization workflow to achieve the highest efficiency motor with capability to have a reliable operation in the new application with the required voltage range. The electrical motor requirements consist in three main objectives: 1) achieve the highest efficiency possible in the rated condition with the rated power supply; 2) reliable operation, without overheating, with the maximum voltage power supply under the minimum load condition in the operating envelope; and 3) reliable operation, without stalling nor overheating, with the minimum voltage power supply under the maximum load condition in the operating envelope. The electrical motor design workflow uses an analytical software for electromagnetic simulation and an optimization tool coupled to it. The simulation setup is able to run several combinations of motor stack height, winding distribution and capacitor values, and move toward the configuration that fulfill the constrains and optimization target. Finally, it is presented the electrical motor final design tests results in dynamometer and the hermetic compressor results in calorimeter, showing the achievement of previously determined restrictions and targets.
