Patent Number: 7,786,633

Title: Electric motor with a retractable shaft

Abstract: An electric motor (100) for controlling the lateral displacement of a shaft (114) connected to a rotor (104) of the electric motor (100) is provided. The electric motor (100) includes one or more stator conductors (106) for carrying a current and one or more permanent magnets (108) to produce a magnetic field (504). The one or more stator conductors (106) interact with the magnetic field (504) when the power is applied, to purposely generate a force with an axial (Fa) and a circumferential component (Fc). The electric motor (100) includes the shaft (114) that travels along a rotor axis (506) in an axial direction when the power is applied, under an action of the axial component of the force. However, when the power is removed, the shaft (114) retracts under the action of a biasing force from a tension device (118).

Inventors: Pais; Martin R. (North Barrington, IL), Cheng; Shumin (Vernon Hills, IL), Schmidt; Detlef (Schaumburg, IL)

Assignee: Motorola, Inc.

International Classification: H02K 7/06 (20060101); H02K 7/10 (20060101)

Expiration Date: 8/31/12018