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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...
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...
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...
This paper examines the control performance of a permanent magnet synchronous motor drive system based on direct torque control (DTC) using a SiC-MOSFET inverter (SiC inverter). The dead-time of the inverter affects the performance of the motor control. In high-speed drives, the dead-time effect increases because the control period becomes shorter. By using a SiC inverter for which the switching speed...
This paper proposes a mechanical sensorless drive system for an ultra-high-speed permanent magnet synchronous motor based on direct torque control (DTC). This DTC-based drive system has several advantages, including a sensorless drive, a simple structure, and fast torque control. In addition, the rotor speed can be estimated from the estimated flux position obtained by the DTC system. These are important...
This paper examines the control performance of permanent-magnet synchronous motor drive systems based on current control and direct torque control (DTC) when flux-weakening control is applied. The control law in the – frame, which is used in the DTC, requires only armature resistance, whereas the control law in the – frame, which is used in current control, requires many motor parameters for flux-weakening...
This paper proposes a direct torque controller in a rotating M-T reference frame that is synchronized with the stator flux-linkage vector. Both the torque and flux estimator and the controller operate in the M-T frame, whereas conventional estimators operate in the stationary α-β reference frame. The proposed controller is suitable for rotor speed and position sensorless control of permanent magnet...
This paper proposes a novel control scheme for wide speed range operation of synchronous reluctance motors. The proposed scheme consists of a combination of maximum torque per ampere control, maximum torque per flux control, flux-weakening control and torque limiting. These controls are based on a mathematical model in a rotating reference frame that is synchronized with the stator flux linkage. The...
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