Inertia Dynamics, Inc.

Warner Electric Technology, Inc.

Stephen Edward Nyquist

Kevin L Maurice

Bradley Lyn Uffelman

Paul A Larson

Richard Larry Silvestrini

Jon L Masthay

Paul K Seeto

Timothy J Dahlstrom

An electromagnetic brake is provided in which short duration current pulses move the brake between engaged and disengaged states. A first current pulse having a first polarity is delivered to a conductor within a field shell when the brake is engaged and establishes an electromagnetic circuit including the field shell and an armature plate that urges the armature plate away from a rotating friction plate and towards the field shell to disengage the brake. A magnetic circuit is maintained after termination of the first current pulse due to a remanence in at least one of the armature plate and the field shell. A second current pulse having a second polarity opposite the first polarity delivered to the conductor when the brake is disengaged weakens the magnetic circuit thereby allowing a spring to move the armature plate away from the field shell and towards the friction plate to engage the brake.

Bistable Brake

A rotational coupling device drives an output synchronous with either of two inputs. The device includes a hub disposed about an axis and an output member supported on the hub for rotation about the axis. First and second input members disposed about the hub are configured to rotate in first and second rotational directions and at first and second speeds, respectively, with at least one of the directions and speeds differing. A clutch member is disposed axially between the input members and coupled to the output member. An electromagnet is on an opposite side of the second input member relative to the clutch member. When the electromagnet is deenergized, the clutch member engages the first input member and the output member rotates with the first input member. When the electromagnet is energized, the clutch member engages the second input member and the output member rotates with the second input member.

Rotational coupling device for bimodal selective output

The brake includes a housing for mounting and a disc assembly. The disc assembly engages a drive shaft for rotation therewith. A flange on the disc assembly receives a first ring and a second ring, each ring is slideably engaged to the flange for axial motion. Release plates adjacent to the second ring are free to move in an axial direction. A field cup has springs to bias the release plates against the second ring and o-rings to facilitate quiet operation of the elevator car brake. When no current flows through the coil, the release plates are biased against the second ring. Thus, the second ring engages the friction surface of the housing to park and hold the drive shaft. When current flows through the coil, the first and second release plates are drawn to the field cup, overcome the bias force of the springs and compress the o-rings.

Elevator brake assembly

An electromagnetic disk brake is compact, self-sealing, self-contained, has relatively few components, and is relatively easy to fabricate and to install when compared to traditional electromagnetic disk brakes. Self-containment and self-sealing are achieved by providing a skirt on the field cup that extends over the remaining moving components of the brake and that is attached, preferably by a press-fit, to a reaction plate at the inner end of the brake. The need for stand-offs to set the air gap of the brake can be eliminated by suitable control of the press-fitting of the field cup onto the reaction plate. For electric motor braking applications, the reaction plate can form the endbell of the electric motor, thereby combining the endbell, mounting plate and reaction plate in a single plate. Simplicity and ease of assembly of a spring-applied brake are enhanced further by employing a single compression spring at the center of the brake rather than a plurality of peripherally-spaced springs. Finally, in applications in which the brake includes a manual release lever, the brake may incorporate an improved release lever anti-rattle arrangement.

Sealed electromagnetic brake

A combination clutch and brake uses a helically wound spring attached to a pulley at one edge and magnetically drawn to a rotor at a second edge. In a relaxed state, the spring presses against an outer field cup locking the pulley against that cup. In a torsion state caused by the magnetic attraction between the rotor and the spring, the spring decreases in diameter to compress a frictional wedge inward against the pulley and rotor causing them to turn as one.

Electric clutch and brake

A multiple plate clutch/brake employs a single electromagnet coil to attract an elongate cylindrical armature to compress a series of non-ferromagnetic friction plates alternately joined to one of two independently rotatable shafts. The armature joins one set of friction plates to its shaft for torsional but not axial forces. The compression of the friction plates by the armature transmits torque between the shafts rather than frictional contact by the armature itself. The magnetic path to the armature may pass through two axial gaps to provide a net axial force on the armature. A portion of the magnetic path is provided by one of the shafts.

Electro-mechanical variable speed clutch

An armature assembly in an electromagnetically actuated braking mechanism and including a circular armature plate having a central opening defined by a circumaxial series of radially inwardly extending armature teeth. The inner ends of the armature teeth cooperate to define a coaxial crest circle. A plastic hub, molded in place on the armature plate, substantially encapsulates the armature teeth and has a coaxial central opening defined by a circumaxial series of spline teeth which define a root circle having a diameter greater than the diameter of the crest circle. Equiangularly spaced fan blades integrally connected to the central portion of the hub project radially outwardly therefrom adjacent one face of the armature plate. A resilient split clamping ring coaxially surrounds and exerts radially inwardly directed biasing force upon projecting end portions of the spline teeth which extend axially outward beyond the one face of the armature plate to urge the spline teeth into engagement with a spline on an associated shaft.

Growing community of inventors

Simsbury, CT, United States of America

Stephen Edward Nyquist