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Showing 1 to 10 of 10 for “"Volts per hertz"”.
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Analysis of volts per hertz scalar control as governor of high pole count, high frequency, permanent magnet synchronous machine
The student, Katherine O'Kane, accepted the attached license on 2017-04-20 at 11:04.
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Induction motor torque during fast bus transfers
… standards specify that the resultant vectorial volts per hertz between the motor and voltage source must not exceed 1.33 per unit. This project studies the correlation between induction motor electromagnetic torque and the industry reclosing limit for multi-motor systems. A dynamic induction …
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High performance induction machine control: Methods, limits and solutions
This thesis discusses various high performance induction machine control methods and provides methods for improved performance. Parameter sensitivity analyses on the discussed control methods are given. Practitioners have reported performance degradation during high speed DTC operation, including …
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Development of a low cost inverter controlled induction motor drive with emphasis on the effect of power factor correction
… such drives, there is little need for high-performance microcontroller controlled drives, since the only adjustments to the drive are made at the factory. The developed drive achieves the low cost and compact aims by implementing with analog components the constant Volts per Hertz technique. …
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Torque -Angle Based Analysis and Control of Induction Machines
Volts per hertz control, field-oriented control (FOC), and direct-torque control are the most popular induction motor control methods. One common feature that is shared by these control methods is to regulate the amplitude of the flux in the induction motor. There are numerous techniques to improve …
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A DSP based variable-speed induction motor drive for a revolving stage
… The use of this DSP yields enhanced operations, fewer system components, lower system cost and increased efficiency. The control algorithm is based on the constant volts-per-hertz principle because the exact speed control is not needed. Reflective object sensors which are mounted on …
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High Performance Sensorless Controlled PMSM Drive with Long Cable for Subsea Applications
… necessary to extract natural gas and oil. The Permanent Magnet (PM) motors, known for their higher efficiency and high-power density, are increasingly preferred over traditional induction motors in these applications. It is important to consider that subsea systems, characterized by the …
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Investigation of High-Efficiency Radial and Tapered Brushless PM Machines
… modifications should be considered. Brushless permanent magnet (PM) machines are an excellent substitute to replace conventional machines in many applications as they offer higher efficiency, reliability and power density. Therefore, this thesis addresses the design challenges in two separate …
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Comparative performance analysis of drives for induction motors
The asynchronous polyphase induction motor has been the motor of choice in industrial settings for about the past half century because power electronics can be used to control its output behavior. Before that, the dc motor was widely used because of its easy speed and torque controllability. The …
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Condition Monitoring of VSD-fed Induction Motors
… which need good dynamic and steady state performance over a large range of speeds [2]. The induction motor is often referred to as the workhorse of the industry due to its predominance in the industry – constituting around 90% of all the motors in the industry [3], [4]. Its admired …