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This paper proposes a non-symmetrical permanent-magnet linear motor traction system (PMLMTS), in which the primary permanent-magnet linear motor (PMLM) is employed. Four movers are mounted with same phase angles. There are nine legs, including eight independent legs and one common leg. All legs have same normal voltage but different normal currents. The normal current of the common leg is four times...
This work provides new magnetic and electrical design guidelines for an integrated motor-drive system. Two significant design factors including the electric and magnetic loadings are targeted to address the issues associated with the combination of the motor and inverter performances. A set of new constraints are also introduced in terms of the magnetic, electrical and thermal limits of a field oriented...
At PUES Corporation we have developed an electric drive system suitable for small vehicles and motorcycles that transports heavy loads. The replacement of the energy sources from fossil fuels reduces the greenhouse gases. The key point in this development is the expandability to be used for a wide range of applications, in order to make effective cost reductions through mass production. The developed...
This paper presents a reduction method for a torque ripple resulting from a motor phase current sensor offset error for motor drive applications such as a hybrid electric vehicle (HEV). The proposed method compensates for the detected motor phase current offset error by subtracting the detected motor phase current offset error value indirectly estimated using the inverter offset voltage reference...
The main advantage of multiphase frequency controlled AC drives is that they have more control resources than the 3-phase ones. The increase of the inverter system phase number (i.e. the number of the phases) more than five together with the joint application of the over-phase control method and the classical principle of AC motor frequency control in these systems allow to improve considerably a...
In large drive applications load-commutated inverters (LCIs) are one of the most used technologies, mainly because of their excellent reliability records. However, LCIs are known to generate interharmonics. They can interact with the mechanical system at torsional natural torsional frequencies of the rotating train, both on the inverter and on rectifier side in weakly connected power systems, such...
In high-power electric drives the use of multiple three-phase stator windings, supplied by voltage-source PWM inverters, is a design strategy for power rating, performance and reliability enhancement. Possible drawbacks, highlighted in the literature, come from the high-frequency circulation currents that originate in motor phases due to PWM switching. When a synchronous machine is used as the motor,...
Voltage-source inverter (VSI) technology, suitable for synchronous-motor applications, now exists with high power ratings producing high output voltage (≥ 11 kV) with significant benefits over the widely used load-commutated-inverter drives. This paper covers an existing VSI technology applied for the first time at a higher operating voltage. This 15.5-MW 11-kV VSI adjustable-speed drive (ASD) installation...
Voltage source Inverter (VSI) technology, suitable for synchronous motor applications, now exists with high power ratings producing high output voltage (ges11 kV) with significant benefits over the widely used load commutated inverter (LCI) drives. The paper covers an existing VSI technology applied for the first time at a higher operating voltage. This 15.5 MW, 11 kV VSI Adjustable Speed Drive (ASD)...
The work is intended to explain the basic ideas related to design of sensorless drive with high-speed permanent magnet synchronous machine and vector control system for the oil-drowned pump. The drive and it's control system must allow the pump operating very reliably under heavy conditions. The digital control system has a hierarchy local-distribute structure. The upper level is a ground control...
Cost and reliability reasons lead to motion sensorless control of high speed PMSM drives. This paper introduces a novel emf based observer for rotor position and speed estimation that provides very fast starting from pre-produced zero initial position (less than 100 milliseconds from zero to 10 krpm in a 750 W surface PMSM) with very good dynamics response to large step torque perturbations. Implementations...
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