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Compact bi-directional torque motor
| Details |
Inventors: Hulsing, II, Rand H.;
Assignee: Sundstrand Data Control, Inc. (Redmond, WA)
Primary Examiner: Stephan; Steven L.
Assistant Examiner: Jones; Judson H.
Attorney, Agent or Firm: Yatsko; Michael S., Joike; Trevor B.
A compact torque motor providing bi-directional, limited angle reactionless torque to opposed structures. A motor (10, 150) includes an X-shaped core (12), and first and second pole pieces (14 and 16), which are disposed at opposite sides of the core. Two opposed legs on the X-shaped core (12) comprise a first core section (18), which is transverse to a similar second core section (20). A first electromagnetic coil (22) is formed on the first core section and a second electromagnetic coil (24) on the second core section. When the first and second electromagnetic coils are alternately energized, tabs (38, 40, 44, and 46) disposed approximate the ends of the first and second pole pieces are attracted to the resulting magnetic poles (26 and 28, 30 and 32), causing the pole pieces to counter-rotate back and forth about a central axis (48). Magnetic flux developed by the first and second electromagnetic coils is conveyed through the tabs and the first and second pole pieces between the opposite magnetic poles. Since the pole pieces are lightweight, rotational inertia of the motor is very low, and its efficiency relative high. |
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DETAILED DESCRIPTION In accordance with the present invention, a compact motor for providing opposed rotational driving torques comprises a generally X-shaped electromagnetic core that includes a first and second core section.
Each core section has two diametrically opposite legs disposed about a common central axis.
On the first core section are disposed first magnetic coil means for developing a magnetic flux within that core section when energized with an electric current so that opposite magnetic poles are produced at radially outer ends of the legs comprising the first core section.
Similarly, second magnetic coil means are disposed on the second core section and are operative to develop a magnetic flux within the second core section when energized with an electrical current so that opposite magnetic poles are produced at radially outer ends of the legs comprising the second core section.
First pole piece means, disposed on one side of the electromagnetic core, magnetically link the opposite magnetic poles of the first and second core sections and include first tab means that are disposed proximate the legs of the first and second core sections.
The first tab means define a plurality of surfaces that are attracted to the magnetic poles, causing rotation of the first pole piece means about the central axis.
Second pole piece means are disposed on the opposite side of the electromagnetic core from the first pole piece means and also magnetically link the opposite magnetic poles of the first and second core sections.
The second pole piece means include second tab means disposed proximate the legs of the first and second core sections, which are operative to define a plurality of surfaces that are attracted to the magnetic poles, causing the second pole piece means to rotate about the central axis in a direction opposite that in which the first pole piece means rotate.
The first and second pole piece means each comprise a magnetic flux conductive member extending across the electromagnetic core, generally through and transverse to the central axis
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Generators or Motors 
