Interior permanent magnet motor (IPMSM) was used as air conditioner compressor to reduce the power consumption and improve the performance of the system. Two control methods including maximum torque per ampere (MTPA) and flux-weakening methods were employed to increase the speed range of the air conditioner compressor. The present study adapted the flux weakening algorithm technique which can be used for constant torque and constant power regions. Results indicated that the operation speed range of the IPMSM may increase significantly by using the proposed flux weakening algorithm. 1. Introduction Over the past few years, the environmental problem has grown dramatically worldwide, therefore most researcher spend the majority of their time to developed energy efficient motor drives for the house application and industry. In recent decade the interior permanent magnet synchronous motor (IPMSM) has become the most useful drive in modern speed control [1]. The IPMSM is becoming popular because of its beneficial features such as high power factor, high power density, and fast dynamic response [2–4]. Many researchers published in simulation, modeling, and also analysis of IPMSM drive for control and determining the speed of an IPMSM [5, 6]. One of the major applications of IPMSM is air conditioner [7]. As the air condition is high power consumption, permanent magnet motor can reduce power consumption and consequently reduce the energy bills [8]. The IPMSM saves up to 50% of the energy for air conditioners [9]. The air conditioner units often used by households and small business buildings include a condenser fan, an air handler fan, and a compressor. The compressor consumes 80% of the total inverse, 20% for two fans of total power under normal operating conditions. Therefore, IPMSM for air conditioner compressor that pumps up to 3.7？KW has been used as an industrial standard of the world air conditioner manufacturing like Mitsubishi, Toshiba, LG, and Samsung [10]. The principle of energy efficient air condition system is to use variable speed drive to keep the temperature of area at desired temperature. Several different methods have been used to develop an efficient speed controller for IPMSM. Rahman et al. (1998) have reported a flux-weakening mode based torque controller of IPMSM drive for operation on the exceeding base speed. The drive has not been tested for variable speed operations [11]. Hoque et al. (2002) have proposed a vector control strategy based on maximum torque per ampere (MTPA) scheme for the IPMSM drive. They obtained the -axis command
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