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Asymmetrical multi-lane multi-phase motor drives are introduced in this paper. There are two conventional symmetrical drive systems for multi-phase motors. First one is modular phase multi-lane drive with single-phase inverters and second one is single-lane multi-leg inverter. While first one has high level of fault-tolerance, second one is a cost-effective solution. New class of drive systems, asymmetrical...
Peak torque and power density requirements for traction motor drives continue to increase, while demands on reliability are getting increasingly stringent as well. With the knowledge that most of the failure mechanisms are related to excessive temperature (cycling), thermal management is a key for increasing performance, without jeopardizing reliability. This paper proposes a control strategy for...
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...
Direct Torque Control is a control technique used in AC drive systems to obtain high performance torque control. The conventional DTC drive contains a pair of hysteresis comparators, a flux and torque estimator and a voltage vector selection table. The torque and flux are controlled simultaneously by applying suitable voltage vectors, and by limiting these quantities within their hysteresis bands,...
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...
This paper will present a test bench to verify the reliability of new prototypes of inverter for electric motor in the hybrid vehicle. These inverters must be tested in the same conditions as in real vehicle. A 22 kW induction motor has been used, coupled with a DC motor in order to impose the load torque. We have implemented various mission profiles ( European ARTEMIS cycles) of load torque on the...
In this paper a test bench will be detailed in order to verify the reliability of new inverter prototypes for future EV and HEV electric motors. Cycling tests must be carried out in order to test the reliability of new components for inverters in the same conditions as in real vehicle. A test bench using 20-30 kW induction motor or brushless DC machines has been used. These machines are coupled with...
In a motor-drive system, there are many factors which can be considered as a figure of merit in drive control algorithm. All of these factors should be evaluated simultaneously to achieve the reliable performance of drive. In this paper, an optimization problem is constructed on a direct torque controlled induction motor drive using a candidate from different parts of drive system: inverter loss from...
Future automobiles will be equipped with by-wire systems to improve reliability, safety and performance. The fault tolerant capability of these systems is crucial due to their safety critical nature. Three fault tolerant inverter topologies for permanent magnet brushless dc motor drives suitable for automotive x-by-wire systems are analyzed. A figure of merit taking into account both cost and post-fault...
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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