Performance Variation of Ferrite Magnet PMBLDC Motor With Temperature

Abstract

The price fluctuations of rare earth metals and the uncertainty in their availability has generated an increased interest in ferrite magnet machines. The influence of temperature on BH characteristics of the ferrite magnet differ considerably from that of the rare earth magnet and hence, requires a different approach when deciding their operating point. In this work, laboratory measured BH curves of a ferrite magnet are used for estimating the possibility of demagnetization in a segmented axial torus (SAT) permanent magnet brushless DC (PMBLDC) motor. The BH characteristics for different temperatures have been used to study the performance variation of the ferrite magnet SAT PMBLDC motor with temperature. A detailed analysis is carried out to ensure that, the designed ferrite magnet motor is capable of delivering the specified torque throughout the operating speed, without any irreversible demagnetization of magnets. It has been shown that the ferrite magnet PMBLDC motor operation is influenced by the magnet temperature and the maximum motor speed for a given load torque decreases as the magnet temperature drops.

Life Cycle Assessment of Rare Earth Elements-Free Permanent Magnet Alternatives: Sintered Ferrite and Mn–Al–C

“…With this aim, the optimized ferrite magnets with a similar or better power density than an equivalent induction motor were developed. , Furthermore, De Gennaro et al explained that the reduced performance of motors of hybrid vehicles, due to the avoided RE use, can be compensated by an enhanced electromagnetic and mechanical design of the stator and rotor components . The research and technological activities developed in the framework of the European Project NANOPYME (2012–2015) reached successful design, construction, and testing of a novel fully ferrite-based motor; , this project went one step further and succeeded in the integration of the motor in a fully operational e-motorbike demonstrating its functionality under real use conditions. The most recent project, AMPHIBIAN (2017–2019), improved the ferrite properties by metallic nanowire to produce a patented flywheel, a mechanical device able to store energy .…”

A Review on Poles Demagnetization in Permanent Magnet Motors

“…Ferrite magnets behave differently from rare earth magnets when exposed to temperature and armature reactions. The coercivity of ferrite magnets increase with increase in temperature and coercivity of rare earth magnets decrease with increase in temperature [8], [14]. Ferrite magnets are positive temperature coefficient and rare earth magnets are negative temperature coefficient for coercivity.…”

Stability analysis of sensorless speed control of IPMSM

“…Hence it is necessary to take the temperature effect into consideration. If we assume that the maximum temperature is 70 • C, then for a ferrite magnet or a Nd-Fe-B magnet the characteristics are linear [26,27]. The new parameter values can be determined as follows:…”