Compact bidirectional torque motor with increased torque

Details Compact bidirectional torque motor with increased torque Compact bidirectional torque motor with increased torque

1991-06-25

1993-12-14

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Reciprocating

310 15, 73505, H02K 3312

Patent

active

052705943

ABSTRACT:
A compact torque motor provides increased bidirectional, limited angle, reactionless torque to opposed structures. A torque motor (50) includes an X-shaped core (52), and first and second pole pieces (54) and (56), which are disposed at opposite sides of the core. Two opposite legs on the X-shaped core comprise a first core section (58), which is transverse to a similar second core section (60). A first electromagnetic coil (62) is formed on the first core section and a second electromagnetic coil (64) is formed on the second core section. The ends of the first core section thus become magnetic poles (66) and (68) when an electrical current flows through the first electromagnetic coil; and similarly, the ends of the second core section become magnetic poles (70) and (72) when an electrical current flows through the second electromagnetic coil. The sides of the magnetic poles are generally radially aligned about a central axis (88). Adjacent the sides are disposed tabs (78, 80, 84, and 86) that are connected to the first and second pole pieces. These tabs are also generally radially aligned, and in cooperation with the adjacent sides of the magnetic poles, define gaps (100) through which magnetic flux flows. Magnetic flux developed by the first and second electromagnetic coils is conveyed through the first and second pole pieces and produces a force in a direction tangential to radial lines through the gaps. A radial fringe force caused by a fringe field at the end notches (106) in the sides of the magnetic poles is compensated by forming the tabs and the pole faces at a very small angle in respect to radial lines through the central axis. The compensating force developed as a result of the small angular offset is equal in magnitude, but opposite in direction to the radial fringe force so that the torque developed is substantially free of a radial component.

REFERENCES:
patent: 3312842 (1967-04-01), Heuchling et al.
patent: 3671787 (1972-06-01), Herron
patent: 3828213 (1974-08-01), Yamashita et al.
patent: 4642539 (1987-02-01), Hinds
patent: 4855700 (1989-08-01), Mohler
patent: 4968909 (1990-11-01), Hulsing

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