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Medium voltage permanent magnet synchronous motor (PMSM) driven subsea pumps have the potential to improve system efficiency and reliability to lower the operating costs, and reduce the subsea pump module (PM) weight and size. These subsea pumps can be deployed in the well, in a dummy well or on the mudline in a skidded configuration. The higher speeds achieved by such motors, compared to the same...
This paper proposes novel V/f control for interior permanent-magnet synchronous motors (IPMSMs) in order to achieve maximum torque per ampere (MTPA) control without motor parameters such as dq-axis inductance and flux linkage of a permanent magnet. The V/f control does not require either information of a rotor position or the motor parameters in order to construct the control system. However, the...
An easy optimization methodology for design of permanent magnet synchronous motors is presented. The analyzed structure is a permanent magnet assisted synchronous reluctance motor (PMA-SRM). For a motor design optimization the parameters are the geometric and electrical magnitudes. The proposed method of optimization is divided into two parts: global optimization (geometric parameters) and local optimization...
The work described in this paper deals with the analytical design and optimization of a line-start permanent magnet synchronous motor (LSPM) with a series magnetic circuit structure. The design approach considers a LSPM as an induction motor (IM) combined with a permanent magnet rotor arrangement and takes into account the characteristics of both asynchronous and synchronous regimes.
Induction motors are the workhorses of industry and represent nearly the entire installed base of constant-speed and most variable-speed motors. But the power factor and efficiency of induction motor are limited by its squirrel cage rotor. In the past, the colleagues all over the world tried to research and develop supper premium efficient electrical motor to replace the Premium® efficient induction...
This paper presents a modified direct torque control scheme for matrix converter drives. This method allows a reduction of the harmonic content of the input current without any negative effect on the drive performance and its simplicity. By using two switching configurations at each cycle, the synthesis of the input current vector is more accurate than the previous method at the same sampling period,...
A special permanent magnet synchronous motor for ship propulsion in the power range between 50 and 250 kW is presented. It is fed by a PWM-voltage source inverter with field oriented control. A motor feature is the very low stator inductance. It leads to low reactive power and high maximum torque, but on the other hand it produces large current ripples and therefore harmonic losses up to 10 % of the...
This paper presents an improved direct torque control (DTC) method for sensorless matrix converter drives using a multi-mode indirect space vector modulation (ISVM) and an adaptive sliding mode observer. The drive system is characterized by reduced torque and flux ripples, unity input power factor, sinusoidal input/output waveforms and good sensorless control performance over a wide speed range, while...
Synchronous, motor drives are fast becoming an attractive alternative to DC, and induction motor drives, especially in the low speed, high power range. Different types, of control schemes, have been suggested for variable speed AC drives, fed from static power source. Among them, field oriented control employing vector control, strategies has become quite popular in recent near, A disadvantage of...
This paper investigates stability of a drive system incorporating a high-field PM synchronous motor with the aim of identifying a real-time stability index by means of an algorithm based on the Lyapunov method. Results from computer simulation show that the first principal minor (MINR1) of the Lyapunov function has a distinct sign change in the region of interest. Such an important finding makes it...
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