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| Number | Title | Issue Date |
| 8026680 | Methods and apparatus to reduce the stopping time of spindle motors Methods and apparatus to reduce the stopping time of a spindle motor are disclosed. An example method includes detecting a dissipation current flowing in a spinning motor; determining when the dissipation current drops below a threshold value; and, in response to th... | 09/27/2011 |
| 7372226 | Method for switching off a power tool In a method for shutting off a drive motor (12) of a power tool that drives a tool, the drive motor (12) is shut off as a function of a variable threshold value (E1) if the tool jams. The threshold value (E1) is determined in at l... | 05/13/2008 |
| 7122982 | DC motor rotation information detecting device A rotation information detection device detects rotation information of a DC motor based on a surge component waveform superimposed on a voltage waveform between the terminals of the DC motor or a current waveform of the DC motor, a circuit is provided which supplie... | 10/17/2006 |
| 7071645 | Braking device for an electric motor, electrical apparatus provided with the braking device, and a method of braking A braking device for an electric motor of a power tool has a short circuit switch for short circuiting an armature winding of the electric motor during a braking process, the short circuit switch for controlling its switch condition having a control input, a control... | 07/04/2006 |
| 7030579 | System and method for retrofit mechanism for motorizing a manual turret A mechanism for retrofitting a turret that has a manual rotation system with a motorized turret rotation system includes a gear box mechanically coupled to the turret, an electrically powered prime mover unit mechanically coupled to the gear box, a user operated con... | 04/18/2006 |
| 7014000 | Braking apparatus for a patient support A patient support including a propulsion device for moving the patient support. An automatic braking system is provided to selectively brake the patient support. ... | 03/21/2006 |
| 6971489 | Removable motor brake for use with vehicle slide out A motor and brake assembly having a disengaging mechanism for use with RV's are disclosed. The assembly includes a motor and a disengaging mechanism that is mounted thereon. The disengaging mechanism includes a motor mount comprised of a cylindrical piece with a plu... | 12/06/2005 |
| 6909313 | Circuit and method for detecting the state of a switch with reduced power A circuit and method are disclosed for detecting activation of a switch, such as a mechanical switch, having a first terminal coupled to two or more voltage sources, with each voltage source providing a distinct voltage level representing a logic high level. The cir... | 06/21/2005 |
| 6903584 | Circuit and method for detecting the state of a switch A circuit and method are disclosed for detecting activation of a switch, such as a mechanical switch. The circuit may include a first circuit for temporarily driving the second terminal of the switch to a second logic level. A second circuit, coupled to the switch, ... | 06/07/2005 |
| 6867561 | Electrical machine An electrical machine comprises a rotor without windings, a stator having an armature winding 24, 25 and a field winding 10 for generating a magnetomotive force in a direction extending transversely of the magnetomotive force generated by the armature ... | 03/15/2005 |
| 5838124 | Systems and methods for braking of actuator and brushless DC motor therein A brushless DC motor is controlled by determining a speed of the motor and a line voltage supplying drivers of the motor. Based upon these determined values and predetermined motor performance data, a maximum PWM on-time is determined for drive signals su... | 11/17/1998 |
| 5825154 | Phase control method of stopping a drive smoothly A method of smoothly stopping pump drives without pressure surges is provided. To accomplish this, the phase control angle between the motor current and the motor voltage is increased according to a linear ramp starting from 0° with the help of an a.c. p... | 10/20/1998 |
| 4954759 | Control circuit for an electromagnetic breaking arrangement The electromagnetic braking arrangement comprises an exciting winding which is supplied from a generator winding which on the one hand excites the generator winding and on the other hand induces a braking torque in a short-circuited winding moved with the... | 09/04/1990 |
| 4533021 | Lift exit emergency safety system A safety device for the emergency evacuation of a cabin at a safe floor in an elevator shaft includes a main motor, a three-phase current cable, a conveyor, an electric brake, an inertia flywheel, wheels positioned around the outer periphery of the inerti... | 08/06/1985 |
| 4276500 | Braking system A braking system for transportation apparatus, such as an escalator, having an electrical drive. The braking effort applied when the transportation apparatus is to be stopped is inversely proportional to the electrical energy being consumed by the electri... | 06/30/1981 |
| 4249117 | Anti-kickback power tool control An impending kickback condition in the operation of a power tool or machine tool system is sensed and used to control or eliminate the kickback. The ability to sense an impending kickback condition can be used in all categories of power driven tools. The ... | 02/03/1981 |
| 4136305 | Power converter control apparatus A power converter control apparatus comprising continuously controlled converter units and on-off controlled converter units for effecting powering control and regenerative braking control of a DC motor, which is arranged to include a unit change circuit ... | 01/23/1979 |
| 4124812 | Braking control apparatus for an electric motor operated vehicle In cases of subjecting an electric motor operated vehicle to electric braking, regenerative braking is performed during the first stage of the braking operation thereby supplying the armature current to the battery as a load, and a plugging operation is p... | 11/07/1978 |
| 4051421 | Braking mode control for a chopper controlled d-c electric motor A control system for effecting smooth braking resistor staging of a chopper controlled direct current electric motor. The control system utilizes auxiliary switches mechanically coupled to resistor by-pass contacts to sense actual motion of the by-pass co... | 09/27/1977 |
| 3995204 | Braking mode control for an electric traction motor A control system for a DC electric traction motor which eliminates cogging of the motor during transition from a driving to a plugging mode. The system incorporates apparatus for comparing motor armature current to a plugging current reference voltage whi... | 11/30/1976 |
