Resonant Tank Motor Model For Voltage Reflection Simulations With PWM Drives

Reflected wave transient voltages that are impressed on drive output cables and low voltage AC induction motors are normally simulated with steep fronted dv/dt pulse waveforms from PWM voltage source inverters. System simulation arises from a need to correlate reflected wave peak voltage and risetime with the dielectric insulation capability of both the motor and cable. To obtain reasonable results, accurate models of each component must be employed. This investigation concentrates on parameter identification for a high frequency resonant tank motor model from fractional to several hundred horsepower

Thermal parameter estimation using recursive identification

This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder

Bearing Currents and Their Relationship to PWM Drives

Abstract- This paper examines ac motor shaft voltages and the resulting bearing currents when operated under Pulse Width Modulation (PWM) voltage source inverters. The paper reviews the mechanical and electrical characteristics of the bearings and motor in relation to shaft voltages and bearing currents. A brief review of previous work is addressed including the system model and experimental results. The theory of Electric Discharge Machining (EDM) is presented including component calculations of the system elements. The effect of system elements on shaft voltages and bearing currents are evaluated experimentally and the results compared to theory. A design calculation is proposed that provides the relative potential for EDM. Finally, the paper will present quantitative results on one solution to the shaft voltage and bearing current problem. I

Riding the Reflected Wave - IGBT Drive Technology Demands New Motor and Cable Considerations

Drive manufacturer migration to Insulated Gate Bipolar Transistor (IGBT) output devices demands a more careful selection of motors and load cables. IGBT drives have faster output voltage risetimes which have increased the dielectric voltage stress placed on the motor. Semiconductor risetime now has a greater influence on motor transient voltages, emphasizing the need to understand the reflected wave phenomenon and its system effects on both motors and cables. Issues and solutions relative to motor selection, cable selection and installation are outlined and discussed. Potential problems and solutions not commonly known, even among experienced drive users, are presented

Reporter

Reporter Vol. 72 No. 0

Reporter

Reporter Vol. 72 No. 09; cover text: "Looking Back: The Year in Review

Reporter

Reporter Vol. 72 No. 08; cover text: The Challenge of Life Without Sigh

Reporter

Reporter Vol. 72 No. 06; Cover text: Get a Grip