Reduction of Cogging Torque in Dual Rotor Permanent Magnet Generator for Direct Coupled Wind Energy Systems

Table 4

Important specifications of DRFPMG prototype.

Symbol	Values	Unit
	1	kW
	120	rpm
	46	Hz
	78	V
	0.3115	m
	0.3015	m
	0.1510	m
	0.1710	m
	0.1722	m
	0.2897	m
	0.04	m
	0.005	m
	45	—
	45	—
	46	—
	46	—

is the rated power, is rated speed, is frequency, is output voltage at no load, is outer diameter of outer rotor, is inner diameter of outer rotor, is inner diameter of inner rotor, is outer diameter of inner rotor, is stator inner diameter, is stator outer diameter, is effective axial length, is thickness of magnet, is number of inner stator slots, is number of outer stator slots, is number of inner rotor poles, and is number of outer rotor poles.