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In this paper a novel adaptive Maximum Torque per Ampere (MTPA) control scheme of an interior permanent magnet synchronous machine (IPMSM) is introduced. To avoid an on- or off-line numerical calculation of the reference current for the MTPA curve, a reference model of the torque which is equivalent to the IPMSM with zero d-axis current is utilized to enforce the torque of the IPMSM towards its reference...
This paper deals with the analytical description of an interior permanent magnet synchronous motor running in six-step conduction mode. It assumes a non-sinusoidal back emf, but inductances vary sinusoidally with the rotor position. The proposed model renounces Park's transformation and delivers a set of equations which allow the numerical simulation of phase currents and torque in the abc reference...
In the vector control of a permanent magnet synchronous motor (PMSM), the adequate control of the d-axis stator current component is important to achieve an efficient energy consume, and to increase the speed above the nominal value through flux-weakening method. This paper presents a simple a non-linear d-axis current controller which uses the mechanical speed, the q-axis stator current and a correction...
The high speed drives are much interested in the industrial applications due to the compact size and high efficiency. This paper presents a torque control scheme using modified TSF(Torque Sharing Function) for the high speed SRM(Switched Reluctance Motor). Because of the short commutating duration in the high speed region, the negative torque from the tail current makes the high torque ripple. In...
For the description of a permanent magnet excited synchronous machine the idealized equations of common synchronous machines can be used omitting the damping windings and replacing the current excitation by a permanent flux. For a more accurate modeling, nonideal behavior like saturation, cross-coupling magnetization and slotting effects can be included. This is done by extending the common d-q equations...
The windup phenomenon caused by the current limitation and PWM voltage regulation in the brushless DC motor (BLDCM) double PI loop speed regulating system has been investigated. And the anti-windup controller has been applied to suppress the relevant windup phenomenon. The simulation illustrates that the anti-windup controller make the BLDCM speed regulating less overshoot and quickly dynamic response...
By studying the circuit equation in the process of commutations of brushless DC motor (BLDCM), the reason of phase current ripple is pointed out. The effect of phase current ripple to electromagnetic torque is analyzed. The deficiency of conventional current closed-loop control is studied. On the base of analysis a new current closed-loop control method is proposed. Phase current is inputted to PI...
The use of voltage source inverter (VSI) in high performance drives removes the restriction of the number of motor phases. Due to the reported advantages of multi-phase machines they have become of increasing interest to the industry. This paper provides a Matlab/Simulink built n-phase machine model in terms of physical variables along with the VSI and V/f control scheme that a user can easily set...
Through the increasing use of electric actuators, the induction motor is now major in industrial applications and takes a particular interest for applications requiring high power and variable speed robustness and for its simplicity and its low cost. The early detection for motor deterioration can increase plant availability and safety in an economical way. To improve the reliability as a whole, a...
A novel mathematic model for a dual three-phase permanent magnet synchronous machine(pmsm) was proposed. A set of equivalent three-phase windings was built based on same magnetomotive force and power. Then it can substitute the old dual three-phase pmsm equivalently after a winding transformation. With the mathematical model of the three-phase pmsm in the rotary reference frame, the model of a dual...
This paper describes an enhanced optimal torque control strategy for fault-tolerant permanent magnet machines under flux weakening operations. By adjusting the degree of flux weakening according to estimated instantaneous torque control errors, the torque control performance of the machine can be improved when operating above its base speed under either open- or short-circuit fault conditions. Extensive...
This paper describes the theory underlying the formulation of a "minimum set" of finite-element solutions to be used in the design and analysis of saturated brushless permanent-magnet motors. The choice of finite-element solutions is described in terms of key points on the flux-MMF diagram. When the diagram has a regular shape, a huge reduction in finite-element analysis is possible with...
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