... : No core, no hysteresis and cogging, low starting torque Wind generator motorXD-PSF400-type vertical axis wind turbine Properties:1. No ... rare earth permanent magnet, Multi-polar, small gap, high power density, output power;5. Low-speed direct drive, no torque ripple;6 ... . Compact, high-volume power ratio;7. Because no iron loss, low heat, temperature rise ...