Analysis of losses and thermal model in a surface-mounted permanent-magnet synchronous machine over a wide- voltage range of rated output power operation

Zhang, Chengning; Tian, Zhen; Dong, Yugang; Zhang, Shuo

doi:10.1109/itec-ap.2014.6941038

Cited by 2 publications

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where V q i , V d i , i q i and i d i are the quadrature and direct voltages and currents of the i-th motor, J i and J ss are the motors and the screwshaft inertias, m ss and m o are the screwshaft and output shaft masses, R is the motors phase resistance, L d and L q are the motors inductances in the rotor frame (which are identical in the reference EMA, because the PMSMs have surface-mounted magnets), k t is the motors torque constant, n d is the number of motors pole pairs, F e is the external load, k m and d m are the stiffness and damping referred to the roto-translating motion deformation of the m-th screw-nut coupling (with m = 1, 2, 3), while T fr i , ω fr i , F fr o and v fr o are the parameters of the "Coulomb-tanh" friction models related to the i-th motor and the output shaft, respectively. iron losses in the motor [53,54], but the inclusion of these model features would entail minor effects for the examined application. In particular, the mechanical freeplay, due to the screw-nut couplings preload, was extremely small in the reference EMA and its contribution in the model would have been poor.…”

Section: Nonlinear Dynamic Modellingmentioning

confidence: 99%

“…It is worth noting that the proposed model represents a balance between prediction accuracy, objectives of the study and complexity of the model itself. More accurate simulations could include mechanical freeplay [30], sophisticated friction models [51,52] and iron losses in the motor [53,54], but the inclusion of these model features would entail minor effects for the examined application. In particular, the mechanical freeplay, due to the screw-nut couplings preload, was extremely small in the reference EMA and its contribution in the model would have been poor.…”

Section: Nonlinear Dynamic Modellingmentioning

confidence: 99%

See 1 more Smart Citation

Model-Based Condition-Monitoring and Jamming-Tolerant Control of an Electro-Mechanical Flight Actuator with Differential Ball Screws

Rito¹,

Luciano²,

Borgarelli³

et al. 2021

Actuators

View full text Add to dashboard Buy / Rent full text

The work deals with the development of deterministic model-based condition-monitoring algorithms for an electromechanical flight control actuator with fault-tolerant architecture, in which two permanent magnets synchronous motors are coupled with differential ball screws in speed-summing paradigm, so that the system can operate even after a motor fault, an inverter fault or a mechanical jamming. To demonstrate the potential applicability of the system for safety-critical aerospace applications, the failure transients related to major fault modes have to be characterised and analysed. By focusing the attention to jamming faults, a detailed nonlinear model of the actuator is developed from physical first principles and experimentally validated in both time and frequency domains for normal condition and with different types of jamming. The validated model is then used to design the condition-monitoring algorithms and to characterize the system failure transient, by simulating mechanical blocks in different locations of the transmission. The operability after the fault, obtained via fault-tolerant control strategy and position regulator reconfiguration, is also verified, by highlighting and discussing possible enhancements and criticalities.

show abstract

Section: Nonlinear Dynamic Modellingmentioning

confidence: 99%