Two-dimensional dc surface motor using window-shaped coils

✍ Scribed by Yoshio Kano; Masaki Yamaguchi; Masayuki Sugawara

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 387 KB
• Volume: 128
• Category: Article
• ISSN: 0424-7760
• DOI: 10.1002/(sici)1520-6416(19990715)128:1<70::aid-eej9>3.0.co;2-c

✦ Synopsis

The authors have been pursuing the possibility of using a two-dimensional dc motor as a driver for a dining assistance apparatus. In this paper, a new type of dc surface motor using window-shaped coils (DSM) is proposed by the authors. Equations describing the relation between the excitation mode of the window-shaped coils and the thrust are derived. The driving characteristics of the DSM are summarized as follows:

1. The maximum flux density of the air gap is calculated to be 0.35 T when the exciting current is 1.8 A. The flux density actually obtained is only 20% of the maximum flux density magnitude (1.8 T) of the yokes (SS41).

2. The thrust constants in the x and y directions are 2.93 and 2.70 N/A, respectively, showing a discrepancy of only 8%. The maximum static thrust is over 5 N when the exciting current is 1.8 A.

3. Good positioning accuracy of 7.5% was achieved when the DSM was subjected to the PD control method.