LIN ENGINEERING Patent applications |
Patent application number | Title | Published |
20160049843 | MOTOR HAVING STATOR ASSEMBLY WITH INTEGRATED MOUNTING AND HEAT SINK FEATURES - A step motor integrates its mounting face and heat sink into the stator design. In particular, mounting holes (typically, four in number) are provided through the stator stack in outer perimeter areas. The stator stack itself becomes the mounting surface, allowing the heat generated from the stator to conduct directly to the mounting plate. The front end cap for holding the rotor in alignment is situated inside of the stator's mounting surface and takes no part in mounting the motor to the mounting surface. The end caps only hold the rotor in proper relation within the stator and contain the bearing assembly for the rotor's axial drive shaft. The perimeter of the stator assembly between the mounting screw holes may have saw-tooth cutouts that define heat-dissipation fins. | 02-18-2016 |
20140125191 | VIBRATION DAMPENING STRUCTURE FOR STEPPER MOTORS - A stepper motor has electromagnetically driven stator segments facing corresponding rotor segments. In order to reduce vibration of the stator segments, motor body end caps are provided with a stepped annular rim along an inside diameter of a centering sleeve. The stepped rim bears against each axial end of the stator segments, with a radial dimension and an axial dimension bracketing a stator segment end in place. | 05-08-2014 |
20140111056 | SMALL STEPPER MOTOR WITH MAXIMUM STATOR TEETH PER POLE - A step motor having a stator constructed with six teeth per pole is achieved for a stator inner diameter (ID) less than one inch (25.4 mm) by a either (1) reducing the pitch angle of the outer teeth of each pole (e.g., to at most 6.8 degrees for a 19 mm stator ID), or (2) narrowing the tooth width of those outer teeth (e.g., to at most 0.0175 inch or 0.444 mm for a 19 mm stator ID), or (3) combination of both. These changes allow sufficient space (i.e., wider than 0.052 inch or 1.321 mm) between poles for passage of a winding needle, even with the extra stator teeth. Although narrowing the pitch angle and reducing the tooth width do sacrifice some torque contribution from each tooth, there still results a net overall gain in torque. | 04-24-2014 |
20120200249 | TWO-PHASE PERMANENT MAGNET STEP MOTOR FOR MOTION CONTROL - A two-phase permanent magnet step motor comprises a permanent magnet rotor having an equal number Nr of magnetic north and south poles defining a fundamental step angle θ=90°/Nr, such that a number of steps per revolution of the rotor is 360°/θ, and a toothless hybrid stator with windings defining a number Ns of stator poles, with Ns being divisible by four and a ratio Nr/Ns=n/4, n being an odd integer. The permanent magnet rotor may comprise a set of rare-earth magnets. Preferably, Nr is at most 10 (i.e., not more than 20 rotor poles). A method of driving the step motor continuously applies successive current phases to the windings with the motor speed being controllable simply by the step pulse rate. The motor can be micro-stepped at low speeds for smooth operation. | 08-09-2012 |
20110241597 | H-BRIDGE DRIVE CIRCUIT FOR STEP MOTOR CONTROL - A drive circuit for step motors with bifilar windings is provided in which both parallel and series winding configurations for the stator coils are selectable by a motor controller based on the motor speed. For low speeds a series configuration is selected, while for higher speeds a parallel configuration is selected. Dynamic torque is optimized by the selection for more efficient motor operation with less drive current. | 10-06-2011 |
20110037352 | MOTOR END CAP POSITIONING ELEMENT FOR MAINTAINING ROTOR-STATOR CONCENTRICITY - A motor is provided with a set of end cap guides on the ends of a stator winding assembly to plot the placement of end caps into the correct placement relative to the stator winding assembly so that the rotor assembly is maintained concentric with the stator. The end cap guides may be rings fitting within the winding insulators on the ends of the stator stack or may be integrated as guide segments with the winding insulators to outline an interrupted cylindrical inner surface coinciding with the inner diameter of the stator winding assembly. The guides allow proper positioning of the rotor assembly without increasing the stator stack length. | 02-17-2011 |