1
Allan B Plunkett: Back EMF sampling circuit for phase locked loop motor control. Synektron Corporation, Chernoff Vilhauer McClung & Stenzel, May 22, 1990: US04928043 (119 worldwide citation)

A sensorless control for DC permanent magnet brushless motor includes a feedback loop connected between the motor stator windings and the inverter which controls the timer at which current is provided to the various windings in sequence. The control of the invention includes a voltage sensing networ ...


2
Robert J Hensel: Fluid bearing with asymmetrical groove pattern. Synektron Corporation, Chernoff Vilhauer McClung & Stenzel, June 27, 1995: US05427456 (67 worldwide citation)

An electric motor construction includes a rotor housing and sleeve which surrounds a shaft/thrust plate. The thrust plate is enclosed in a dead end cavity and is surrounded by a fluid which forms a fluid bearing. The shaft has asymmetrical grooves which create a net pressure gradient from a capillar ...


3
George P Gogue: Permanent magnet motor having high starting torque and narrowly-defined detent zones. Synektron Corporation, Chernoff Vilhauer McClung Birdwell & Stenzel, March 11, 1986: US04575652 (53 worldwide citation)

A permanent magnet motor having a highly nonuniform reluctance gap between rotor and stator creating reluctance torque which aligns the rotor in narrowly-defined detent zones when the motor coils are de-energized. To overcome the high reluctance torque present at the detent zones upon energizing of ...


4
Karl F Konecny: Compact three-phase permanent magnet rotary machine having low vibration and high performance. Synektron Corporation, Chernoff Vilhauer McClung & Stenzel, September 27, 1988: US04774428 (48 worldwide citation)

A compact three-phase permanent magnet rotary machine having minimal reluctance torque and electromagnetic torque ripple, and maximum energy efficiency and starting torque per unit volume of winding, comprises an armature having 3(2n+1) ferromagnetic poles and slots and a permanent magnet assembly h ...


5
Joseph J Stupak Jr: Variable reluctance actuator having position sensing and control. Synektron Corporation, Chernoff Vilhauer McClung & Stenzel, April 21, 1987: US04659969 (46 worldwide citation)

A controlled force variable reluctance actuator. A variable reluctance actuator having a moving element operated by a solenoid is provided in which the current in the solenoid is controlled by a signal representative of the flux density in the magnetic circuit of the actuator. The signal is produced ...


6
Robert J Hensel: Fluid bearing construction employing thrust plate with pressure compensation ports. Synektron Corporation, Chernoff Vilhhauer McClung & Stenzel, July 18, 1995: US05433529 (46 worldwide citation)

A construction for a fluid bearing in a rotary spindle apparatus includes a spindle having first and second ends, and at least one thrust plate coupled to a shaft which is surrounded by a hub having an enclosing sleeve. The sleeve surrounding the thrust plate and shaft defines several gap regions wh ...


7
Hans A Blom: Stator assembly for permanent magnet rotary device. Synektron Corporation, Chernoff Vilhauer McClung Birdwell & Stenzel, September 10, 1985: US04540906 (35 worldwide citation)

A stator assembly for a brushless DC permanent magnet motor or generator features an internal stator with electrical windings surrounded by a permanent magnet rotor. The stator assembly includes a collar member matingly interconnecting the stator core and the winding's power supply circuit board so ...


8
Charles J Cheever, Mark Hazelton, Frank A Gray: Fluid bearings for electronic spindle motors. Synektron Corporation, Chernoff Vilhauer McClung & Stenzel, July 16, 1996: US05536088 (32 worldwide citation)

A construction for an electric spindle motor includes a stationary central shaft with a horizontal thrust bearing plate and a rotating hub assembly. A flanged thrust bearing ring having an upper capillary surface is affixed to the hub assembly. An annular end cap having a lower capillary surface is ...


9
Robert M Pailthorp, Joseph J Stupak Jr, Randall B Elliott: Variable reluctance actuators having improved constant force control and position-sensing features. Synektron Corporation, Chernoff Vilhauer McClung & Stenzel, April 7, 1987: US04656400 (32 worldwide citation)

A variable reluctance actuator, of either the linear or rotary type, having a moving element operated by a solenoid, is controlled by a Hall effect sensor signal representative of flux density in the magnetic circuit of the actuator. The actuator may be operated in either a constant-force control mo ...


10
Joseph J Stupak Jr: Method for sensing and controlling the position of a variable reluctance actuator. Synektron Corporation, Chernoff Vilhauer McClung & Stenzel, May 12, 1987: US04665348 (23 worldwide citation)

A controlled force variable reluctance actuator. A variable reluctance actuator having a moving element operated by a solenoid is provided in which the current in the solenoid is controlled by a signal representative of the flux density in the magnetic circuit of the actuator. The signal is produced ...