Abstract
This study focuses on the core losses in the stator region of high-speed permanent magnet synchronous motors, magnetic field characteristics in the load region, and variations in iron losses caused by changes in these areas. A two-pole 120 kW high-speed permanent magnet synchronous motor is used as the object of study, and a two-dimensional transient electromagnetic field-variable load circuit combined calculation model is established. Based on electromagnetic field theory, the electromagnetic field of the high-speed permanent magnet synchronous motor under multi-load conditions is calculated using the time-stepping finite element method. The magnetic field distribution of the high-speed permanent magnet synchronous motor under a multi-load condition is obtained, and the variations in iron core losses in different parts of the motor under multi-load conditions are further analyzed. The calculation results show that most of the stator iron core losses are dissipated in the stator yoke. The stator yoke iron loss under the no-load condition exceeds 70% of the total stator iron core loss. The stator yoke iron loss under rated operation conditions exceeds 50% of the total stator iron core loss. The stator loss under rated load operation conditions is higher than that under no-load operation. These observations are sufficient to demonstrate that the running status of high-speed motors is closely related to the stator iron losses, which have significance in determining the reasonable yoke structure of high-speed and high-power motors and the cooling methods of motor stators.
Highlights
With the increasing market demand for high-efficiency motors for driving high-speed loads, high-speed permanent magnet synchronous motors (HPMSMs) have attracted considerable attention owing to their high power density and high efficiency [1,2,3]
This inverter characteristic will reduce the efficiency of a motor, and this reduction is especially pronounced in HPMSMs
The results show that compared with an equivalent motor using a conventional non-oriented silicon steel stator core, the nanocrystalline stator reduced total iron loss to 64% from 75%
Summary
With the increasing market demand for high-efficiency motors for driving high-speed loads, high-speed permanent magnet synchronous motors (HPMSMs) have attracted considerable attention owing to their high power density and high efficiency [1,2,3]. Accurate analysis of the magnetic field characteristics of high-speed motors operating under multiple operating conditions of high-frequency inverter power supplies can provide important support for this study and the analysis of motor iron losses, as well as providing the basis for the accurate calculation of motor core iron losses Many scholars, both foreign and domestic, have performed detailed research on motor iron loss [10,11,12,13,14,15,16,17,18,19,20]. The authors in [16] performed a harmonic analysis of the magnetomotive force of the motor and used the two-dimensional finite element method to calculate the eddy current losses of the stator and the rotor core and the eddy current losses in the permanent magnet. Yamazaki built a time-step finite element model of a high-speed asynchronous motor and analyzed the iron core loss caused by higher harmonic magnetic fields [17]. The effects of different load conditions on the losses in each structural area of the stator core can be compared and analyzed, providing a reference for more efficient operation and structural design of HPMSMs in various fields
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