An Appraisal of Power-Minimizing Control Algorithms for Active Magnetic Bearings

Table 1

Specifications of the controller test bed.

	Parameter	Value	Unit
Rotor	Mass	16.6	kg
	Length	0.624	m
	Polar moment of inertia	0.043	kg-m^2
	Transverse moment of inertia	0.32	kg-m^2
	First bending freq. (free–free)	234	Hz
	Second bending freq. (free–free)	600	Hz
	Maximum speed	18,000	rpm
AMB 1, 2	Pole face area,	900	mm^2
	Nominal air gap,	0.6	mm
	Backup bearing clearance	0.3	mm
	Pole angle,	22.5	deg.
	Coil turns,	100	—