Suppression of Thrust Fluctuation of a New Ironless Tubular Permanent Magnet Synchronous Linear Motor Based on the Halbach Array

Table 4

Total harmonic distortion rate of no-load back EMF of CPMS and RPMS.

Type	Fundamental wave (V)	Harmonic number				THD%
		3	5	7	9
RPMS ( = 0.02 m/s)	0.1366	0.0002	0.0003	0	0.0001	0.43
CPMS ( = 0.02 m/s)	0.1257	0.0001	0.0002	0	0	0.23
RPMS ( = 1 m/s)	6.5898	0.0002	0.0214	0	0.0003	0.33
CPMS ( = 1 m/s)	6.3569	0.0001	0.0135	0	0	0.21