QM Power (United States)

This paper introduces an innovative design for a synchronous electric motor that has phase coils and permanent magnets (PM) embedded in the stator. The electric machine contains both concentrated winded phase coils in dedicated slots and spoke-type permanent magnets solely in the stator. The spoke-type magnet arrangement achieves a high flux intensity even with low remanence non-rare earth permanent magnets. As the rotor has no active electromagnetic components, the risk for demagnetization is reduced and advanced cooling applied to the stator can enable high-speed operation. The principle of operation and polarity of the motor are investigated with a unique approach including analytical flux density analysis and piece-wise computational modeling. A design optimization is performed for a 100 kW motor at a speed of 3000 rpm, which is typical for industrial applications. The conflicting objectives of active material cost and motor losses are considered using both rare-earth and non-rare-earth ferrite PMs in the inner and outer rotor configurations of the proposed motor topology. Discussions on the trade-off between conflicting objectives, a specific EV motor design using ferrites, as well as alternative manufacturing, considering achievable slot fill factor (SFF) and choice of steel are also presented. Furthermore, an open-frame lab prototype (OFLP) of the proposed motor topology is constructed and tested to validate the principle of operation and design optimization approach, with due consideration to manufacturing.

One of the popular impedance-network converters are Y-source converters which along with their essential characteristics such as reducing the size of converter components, single-stage power transferring, fault tolerance, and wide voltage gain capabilities there are also some drawbacks that one of the most widespread is high leakage inductances which affect performance negatively. This paper introduces a new configuration based on coupled inductors as a power electronic converter in three case studies to verify the high reliability of the proposed converter by using just a simple controller that is substantial for recycling brake energy in the propulsion system of Electric Vehicles and grid-following inverters. This topology with a straightforward structure, computation, and wide voltage gain, provides a proper connection between the components of its network that obtains appropriate paths for leakage energy, and likewise helps soft-switching in some conditions. Additionally, the performance of other previously related constructions is compared with the suggested topology. Simulations based on MATLABI SIMULINK have been carried out, and correspondingly experiment results have been also presented to substantiate the theoretical outcomes.

This paper reports on the preliminary electromagnetic analysis of a 1:20 gear ratio coaxial magnetic gear (MG) motor for use in an electric vehicle traction application. Both 2-D and 3-D finite element analyses (FEA) are utilized in the electromagnetic design study, and it is shown that if losses can be minimized the high-speed operation of the MG motor could enable the high-gear ratio MG motor to operate with a high overall torque density.

Analytical models of grid-tied inverter with LCL filter in stationary and synchronous reference frames have been established in this paper. State-space analysis of grid-tied inverter with LCL filter has been performed for the current regulator with Proportional Resonant (PR) controller in the stationary reference frame and Proportional Integral (PI) Controller in the synchronous reference frame. The resemblance between both the controllers has been analyzed. The controller Hardware in the Loop (C-HIL) model of the grid-tied inverter has been investigated to implement the current regulation strategy. Results have been validated through PSIM simulations and verified by Typhoon Hardware in Loop (HIL) model.