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In an electrolytic capacitor-less single-phase to three-phase inverter, a control bandwidth limitation adversely affects the source current response. Since the inverter does not energy buffer such as an electrolytic capacitor, the spatial harmonics of motor cause the source current harmonics. Moreover, d-axis current reference of the system is obtained by trial and error in off-line. This paper proposes...
In the field of high-precision position control, the position response requires that there is no vibration. However, a permanent magnet synchronous motor (PMSM) has a wide variety of torque-ripple components, including cogging torque and flux harmonics, which degrade the control performance. Typically, these components are defined as a disturbance torque, and compensation is accomplished by using...
In the AC servo system, the output voltage is restricted by inverter output limitations. Voltage saturation occurs as a result of this limitation. The settling time of current and speed increases because of voltage saturation. This paper proposes a new control system for the rapid and stable speed response of surface permanent magnet synchronous motor (SPMSM) by using the proposed feedforward flux-weakening...
When position-speed sensorless control is used, the estimation error of the position often becomes large because of inductance value fluctuation due to the current. Therefore, this paper proposes a online parameter identification method to identify the static inductance and the dynamic inductance and magnet flux by using fixed trace algorithm. In the proposed method, the harmonic is superimposed into...
Recently, stepping motors have been widely used in the field of industrial manufacturing for high-speed position control over minute distances. Furthermore, fast and precise position control at finer angles is strongly required. However, a few problems hinder the satisfaction of these requirements when using a stepping motor. For example, the motor becomes expensive and its size increases, and the...
In AC servo system, the output voltage is restricted by inverter output limitations. Voltage saturation occurs as a result of this limitation. The settling time of current and speed increases because of voltage saturation. This paper proposes a new control system for improving the transient response of surface permanent magnet synchronous motor (SPMSM) by using the proposed flux-weakening control...
This paper proposes a new fine servo system based on a new over-modulation method with priority given to d-axis voltage for interior permanent magnet synchronous motor (IPMSM). The proposed over-modulation method gives priority to the d-axis voltage to avoid the d-axis voltage saturation, and increases the amplitude of inverter output voltage to achieve the quick torque and speed responses under voltage...
The servo system of a permanent magnet (PM) motor is always required to maintain fine torque and speed response. The current-control system is designed by using the electric parameters of the PM motor. However, motor parameters vary and the current sensors have offset values. When each U-phase and V-phase current sensor has an offset value, the PM motor servo system has the torque ripple and cannot...
It is very important to identify the electrical parameters accurately for the servo system of PM motor, that keep the fine torque response and the fine speed response. Generally, the electrical parameters of PM motor are identified by using the motor voltage and motor current. However, current sensor often has the offset value. In this case, the servo system of PM motor has the torque ripple and can...
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