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US 4,396,874 AGranted
Magnetic apparatus for producing movement
OwnerJ. William Puttinventor
Life of this patent
Estimating the term…
Abstract
Apparatus for providing movement includes an electromagnet. The time required to attain a given value of current flow in a magnet coil is shortened by initially providing a higher voltage to attain quickly the desired current flow, and then providing a lower voltage.
Claims7
Apparatus for producing movement, comprising,
- a pair of paramagnetic members which are relatively movable from mutually distant positions to mutually proximate positions, said members being separated by a gap which opens and closes as the members move relatively away from and toward each other,
- electrical windings including at least a first coil and a second coil on one of said paramagnetic members, said windings when energized being operable to provide a magnetic field which pulls the paramagnetic members together and closes the gap between them,
- energizing means for applying electrical potentials to said windings, causing an electrical current to flow therethrough creating a magnetomotive force in the respective paramagnetic member, said energizing means including the following:
- (a) means for applying a first electrical potential to said first coil to produce the flow of electric current therethrough;
- and,
- (b) means for applying a second electrical potential to said second coil, said second electrical potential being less than said first electrical potential;
- said means (a) being operable to shorten the time required for current in the second coil to reach a given value.
4 more elements
Apparatus for producing movement, comprising,
- a pair of paramagnetic members which are relatively movable from mutually distant positions to mutually proximate positions, said members being separated by a gap which opens and closes as the members move relatively away from and toward each other,
- an electrical coil on one of said paramagnetic members, said coil when energized being operable to provide a magnetic field which pulls the paramagnetic members together and closes the gap between them,
- energizing means for applying electrical potentials to said coil, causing an electrical current to flow therethrough creating a magnetomotive force in the respective paramagnetic member, said energizing means including the following:
- (a) first means for applying a first electrical potential to said coil to establish the flow of electrical current therethrough, said first means being operable for a time interval which is less than the time required to establish a current of I.sub.max =E.sub.1 /R.sub.1 wherein E.sub.1 is the first electrical potential and R.sub.1 is the electrical resistance of the coil;
- (b) second means, operable after said flow of current is established, for applying a second electrical potential to said coil, said second electrical potential being less than said first electrical potential and being effective to maintain said flow of electrical current in the coil.
2 more elements
Dependencies are inferred from the claim text.