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Interior permanent magnet synchronous motors (IPMSMs) are used in various applications. Because of concerns about environmental problems such as global warming, IPMSMs are investigated to improve the efficiency to save energy. Magnetic steel sheets are commonly used in IPMSMs, and the use of low-iron-loss materials in IPMSMs to improve their performance has recently been examined. In this study, the...
Interior permanent magnet synchronous motors (IPMSMs) are currently widely utilized as traction motors. The permanent magnets used in IPMSMs are an important factor; thus, high-coercivity permanent magnets with lesser rare-earth elements are in development. This paper proposes two modified versions of double-layered IPMSMs containing a strong magnet to improve their efficiency and reduce their size...
This paper discusses operating characteristics of a permanent magnet synchronous motor (PMSM) drive system based on direct torque control (DTC). In this system, the whole control system works in a rotating reference frame that is synchronized with the stator flux linkage vector (called M-T frame). The stator flux estimation is also based on a PMSM model in the M-T frame, and thus, this is expected...
Interior permanent magnet synchronous motors (IPMSMs) are used in various applications. It is desirable to reduce the amount of Dy used in the rare-earth magnets contained in IPMSMs, but Dy-free magnets can easily be irreversibly demagnetized, leading to the performance degradation of IPMSMs. Thus, this study investigates the influence of the shape of the demagnetized area in a permanent magnet on...
Interior permanent magnet synchronous motors (IPMSMs) are widely used in many applications because of their higher performance. In recent years, there has been an increasing interest in motor design technologies that can realize required specifications. Therefore, it is important to shorten the design period and generalize the design method. In the present paper, the design period is shortened using...
Interior permanent magnet synchronous motors (IPMSMs) are controlled by either a rotor position sensor or a sensorless control method, which enables highly efficient operation. The voltage-current phase difference control method is a sensorless control method that offers low cost and a simple control system, which is based on V/f control. However, speed ripple occurs under a fluctuating load because...
This paper proposes a mathematical model representing the maximum torque per ampere curve of a permanent magnet synchronous motor (PMSM) and a synchronous reluctance motor (SynRM) in the M-T frame synchronized with the stator flux linkage vector. The proposed model gives the relationship between the stator flux linkage and the armature current. It has advantages such as simple calculation and suitable...
Interior permanent-magnet synchronous motors (IPMSMs) commonly contain sintered rare-earth magnets, the use of which is disadvantageous and should be reduced. As a solution for this problem, the use of bonded rare-earth magnets in IPMSMs was investigated in this study. The purpose of this study was to design an IPMSM containing bonded magnets that can be adopted as a substitute for conventional IPMSMs...
High efficiency permanent magnet synchronous motors (PMSMs) are commonly used in electric vehicles (EVs) and hybrid electric vehicles (HEVs). PMSMs are generally inefficient at high speed because of the use of the flux weakening control. This paper shows possibility that the variable magnetic flux dual-rotor IPMSM, which has a high efficiency in the high-speed and low-torque region. The efficiency...
When permanent magnet synchronous motors (PMSMs) are driven in the ultra-high-speed region, it is necessary to shorten the control period because of the increase in the motor fundamental frequency. Reducing calculation amounts of drive system control for shorter control period is easily applied to applications because it requires simply changing the control software. This paper proposes a calculation...
Interior permanent magnet synchronous motors (IPMSMs) are widely utilized as traction motors. The permanent magnets (PMs) used in IPMSMs are an important factor; thus, high-coercivity PMs with lesser rare-earth elements are in development. This paper investigates the performance of IPMSMs typically used in automotive applications that were modified to contain a novel magnet model (NMM). Rotor models...
When direct torque control (DTC) is applied to permanent magnet synchronous motor (PMSM) drives, the relationship between the torque and stator flux linkage is important for high-efficiency drives because DTC requires them as references. In the stator flux linkage synchronous frame (M-T frame), the torque is described by a simple equation using the T-axis current. However, the M-axis current is neglected...
When direct torque control (DTC) is applied to permanent magnet synchronous motor (PMSM) drives, the relationship between the torque and stator flux linkage is important for high-efficiency drives because DTC requires them as references. In the stator flux linkage synchronous frame (M-T frame), the torque equation is described as a simple equation using the T-axis current. However, the M-axis current...
The miniaturization and high efficiency of permanent magnet synchronous motors (PMSMs) are desired in numerous applications. PMSMs have a number of design parameters in order to enable miniaturization and high efficiency. One such parameter is the ratio of the external diameter to the stack length (D/L). In this paper, we examine the effect of D/L on torque and efficiency in outer rotor surface permanent...
The use of interior permanent magnet synchronous motors (IPMSMs) with rare-earth magnets has recently been on the rise. When IPMSMs are operated to expand the operating speed range by flux-weakening control, irreversible demagnetization might occur in the magnets in the rotor and deteriorate motor characteristics. To prevent this, dysprosium (Dy) is added to rare-earth magnets. However, it is desirable...
Permanent magnet synchronous motors (PMSMs) are increasingly been used in home electric appliances and electric vehicles/hybrid electric vehicles for high performance and high efficiency. Among the different rotor structures in PMSMs, it is expected that the dual-rotor structure can achieve a higher torque than the conventional single-rotor structure. In this paper, various types of dual-rotor PMSMs...
Direct torque control can be applied to any AC motor drive and requires an estimation of the stator flux linkage. Many kinds of estimation schemes have been proposed. However, there are few reports that compare them. This paper compares the estimation schemes in PWM-based direct torque controlled PMSM drives and discusses a suitable estimator for PMSM drive systems with simulations and experiments.
This paper proposes a mechanical sensorless drive system based on direct torque control for permanent magnet synchronous motor. In the proposed system, the whole control system works in a rotating reference frame that is synchronized with the stator flux linkage vector. The armature voltage in the stationary reference frame does not required for the flux estimation. In addition, the proposed system...
Silicon steel is mainly used as the core material in motors due to its low cost. However, it is impossible to expect a significant improvement in torque performance unless the problem of magnetic saturation is solved. In order to dramatically improve torque performance, it is necessary to use a rotor and stator core material that has a high saturation flux density. Therefore, this paper describes...
This paper proposes a novel method for using maximum torque per ampere (MTPA) control for direct torque control (DTC) in the stator flux-linkage synchronous frame (M-T frame). In considering the magnetic-saturation and cross-coupling effects for permanent-magnet synchronous motors (PMSMs), most of the mathematical models in the rotor synchronous (d-q) frame are complex. In the M-T frame, the mathematical...
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