Abstract
In this work a new design of multi-pole gearless low-speed Generator with Magnets on the Stator (GMS) for wind turbine is described. Gearless GMS combines both high number of magnetic poles created by magnets and low-pole winding creating strong electromotive force. Therefore GMS has high efficiency and low operational speed. The GMS mathematical model has been developed. The low-speed gearless GMS was designed with the help of the developed mathematical model. Comparison of the designed GMS with a generator with magnets on the rotor (SG) is given. The GMS active material cost is 2.3 times less than that for the SG. The GMS mass is 1.3 times less. The GMS has higher efficiency at the rated speed. Also GMS maintain high efficiency in wide range of torques and speeds and GMS torque ripple is low.
Highlights
Multi-pole synchronous generators with magnets on the rotor (SG) are commonly used in gearless wind turbine generators
Gearless Generator with Magnets on the Stator (GMS) combines both high number of magnetic poles created by magnets and low-pole winding creating strong electromotive force
The low-speed gearless GMS was designed with the help of the developed mathematical model
Summary
Multi-pole synchronous generators with magnets on the rotor (SG) are commonly used in gearless wind turbine generators. Making such SG of small outer diameter is not easy. The gearless SG (350 rpm, 3141 W, 228 mm of outer diameter, model 300STK2M) with distributed winding has 24 poles on its rotor and 72 teeth on the stator (the slot number per pole and phase is q = 1) [1] (Figure 1a). Gearless SG (200 rpm, 3000 W, 280 mm of outer diameter) has 30 poles on the rotor and 36 teeth on the stator (the slot number per pole and phase is q = 0.4) [2] (Figure 1b).
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