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This paper describes the mechanical design considerations for a 1 MW, 14 000 rpm motor which achieves a specific power of at least 13 kW/kg. This is enabled through an “ironless,” inside out, Halbach array permanent magnet, high frequency, and airgap or slotless configuration. The “ironless” design creates mechanical challenges because thin radial builds which reduce weight also typically reduce structural...
In this paper, a 3 degree-of-freedom bearingless permanent magnet motor with axial active suspension is proposed. The structure and suspension principle of this novel bearingless permanent magnet motor are described in detail and its suspension mathematical models are constructed. Based on the mathematical models, a control system is designed for the new type bearingless permanent magnet motor. The...
The vibration originated from the rotor's unbalance mass impacts on the current oscillation. As the rotor rotating at high speed, Power amplifier circuit will be burned down by excessive control current. While vibrating force transfers to frame, which causes the system vibration and influence the dynamic properties and safe operation. So unbalance compensation on the rotating machine is necessary,...
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