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This paper presents a methodology for extracting useful spatial signals using the motor drive as the sensor during servo operation. Spatially dependent phenomena yield non-stationary frequency content during servo operation. With variable frequency and frequency dependent amplitude in the current and torque signals, the underlying, valuable spatial information is difficult to extract using conventional...
Variable speed drives are becoming the method of choice for powering AC motors in many industrial applications. They allow for flexible speed control, substantial energy savings, and reduced stress during motor start-up, all of which lead to lower lifecycle costs for the shaft line. Modern drives, in order to perform their controlling function, are equipped with sensors, hardware and software to measure...
This paper presents the development and performance testing of a scalar 2 loop decoupled resolution-level controlled (RLC) WM inverter-fed three-phase (3phi) interior permanent magnet (IPM) motor drive system. The proposed RLC WM inverter-fed IPM drive system is based on controlling the WM inverter output voltages using both a phase-shift thetas and the maximum value of the scale J. These two parameters...
In recent years, there has been much research in the development of ultra-precision control technology for automated machine tools to meet the increasingly stringent tolerance requirements. Minor disturbances in input torque, such as torque ripple and static friction that can normally be neglected, become apparent at micron-level scale. We propose a novel form of sliding mode control (SMC) to compensate...
Piezoelectric Actuator Drives (PADs) introduce a new kind of rotary motors, combining high dynamics, torque, and positioning accuracy. The working principle is based on a micro-toothed pair of ring and shaft, which guarantee form-fit and continuous force transmission. Due to miniaturization constant speed and absolute positioning accuracy depend on precise adjustment and therefore demand control to...
A new H-bridge cascaded multilevel inverter which can do regenerative action for motor drive is proposed. The proposed system adds a regenerative unit to the usual non-regenerative cascaded inverter, and the zero-sequence voltage is controlled to keep the regenerated power constant. In this case about 20% of capacitance of the rated motor power is enough for the proposed unit to decelerate motor as...
Servo drives comprise a significant potential of energy saving which has not been considered sufficiently up to now. Simple changes in the motion control of energy optimal and jerk limited motions can be implemented which lead to a reduced acceleration rms-value and slightly increased maximal acceleration. The resulting reduction factors for dimensions and moved masses lead even to further savings...
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