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As the permanent magnet synchronous motor (PMSM) system is the key part of power system in electric vehicles (EVs), the efficiency of PMSM system has great influence on the energy consumption of EVs. To increase the endurance mileage of EVs in one charge, it is important to improve the system efficiency of PMSM drive system. This paper proposes a novel analytical nonlinear loss model for PMSM system...
In the high-speed permanent magnet synchronous motor(HS-PMSM) driver system, the current sampling is not accurate enough to support the calculation of complicated algorithm (vector control, direct torque control, etc.) since the current varies significantly in a single pulse-width modulation (PWM) period because of the small parameter of the HS-PMSM due to the high speed design. In this article a...
An improved approach for predicting the armature reaction field in Permanent magnet AC (PMAC) machines is presented, and eddy current reaction is take into account. Winding configuration of PM machines could be various, such as concentric winding or lapped winding, integral or fractional slot winding, distributed or concentrated winding, single layer or double layer winding. Starting with the field...
This paper investigates a method to increase the energy economy of motors for an electric vehicle (EV) traction system. The low torque region of an EV motor is frequently used in everyday urban driving. Pulse-width modulation (PWM) carrier harmonic loss accounts for a high percentage of total loss for EV motors in this region. This paper reveals the relationship between fundamental and harmonic iron...
As direct-drive actuators, permanent-magnet linear synchronous motors (PMLSMs) are widely used in high velocity and high precision applications. The detent force, however, can deteriorate the performance and even excite the mechanical resonance. This paper focuses on a novel detent force compensation scheme for PMLSM systems through a combination of structural design and control method. First, due...
This paper presents a uniform analytical model by energy method and Fourier series expansion to analyze detent force in uneven magnetic field for permanent magnet linear synchronous motor (PMLSM). The model reveals that detent force in long-primary type is mainly influenced by non-ideal distribution of permanent magnet magnetic motive force, while nounified air-gap permeance makes a great impact on...
Rotating Electromagnetic Voltage Converter (REVC) is a new type of energy converter, which with multi-functions including voltage change, reactive power compensation, harmonics isolation, etc. In the paper, the operating principle of REVC is introduced; the mathematical model of REVC is obtained from relations of voltage, current, inductance and flux linkage. The mathematical model is simulated and...
Recently double-side long primary type linear launcher has attracted more and more attentions for the electromagnetic launch system (EMLS). This paper analyzes the influence of segmented armature and presents a segmented double-side plate permanent magnet linear synchronous motor (PMLSM) in which the new ring windings are engaged. The calculation is described using analytical and two-dimensional finite-element...
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