Matches 1 - 24 out of 24


Match Document Document Title
7898196 Motor driving apparatus for driving and braking brake-equipped motor  
A motor driving apparatus for driving and braking a motor equipped with a brake comprises a motor/brake driving DC power supply which is used both as a motor driving power supply and as a brake...
7154239 Controller for a brushless direct current motor  
A controller includes a power source unit, a drive circuit, and a state control circuit. The drive circuit is coupled to the power source unit, and includes a drive coil and a switching transistor...
5378952 Machine drive system and method  
A drive system for washing machines, electric vehicles or the like has its winding switched to effect speed change and an asynchronous motor operated by a frequency converter where there are more...
4961042 Device for controlling AC motor  
A device for controlling an AC motor for a fork lift truck comprises a detector to detect direction of rotation of an AC motor. The direction of rotation thus detected is compared with a desired...
4548299 AC elevator control system  
An AC elevator control system has a converter for converting a three-phase AC power to a direct current, an inverter for inverting the direct current to a three-phase AC power with a variable...
4491197 Speed control apparatus for A.C. elevator car drive motor  
An SCR bridge of an elevator speed control apparatus is connected between an induction motor 5 and two (R, S) of the three-phase power supply terminals. Two diagonally opposite legs of the bridge...
4460862 Electronic speed and slowing down control with intrinsic safety  
An electronic system is disclosed for controlling both the ascendant and the descendant speed in vertical machines such as cranes, elevators, etc., in which it is required to lift different loads...
4181197 AC elevator speed control system  
A bidirectional triode thyristor is connected to an R phase of a three-phase induction motor through an up contact set and to its S phase through a down contact set. A full-wave rectifier bridge...
4121140 Motor control circuit  
A motor control circuit for preventing automatic restarting of an electric motor following an interruption of electric current flow therethrough. An electric motor incorporates winding means and a...
4084120 Stepper motor valve actuator control apparatus  
An actuator control system includes a ballscrew type actuator for controlling the positioning of a valve device. A control circuit is responsive to pulsed drive signals for driving a synchronous...
4078191 Control system for regulating the torque and speed of an electric motor  
A control system for regulating the torque and speed of an alternating current induction motor used in the traverse drive of an overhead travelling crane comprises an SCR bank controlled by a...
4070604 Stepper motor valve actuator  
An actuator control system includes a ballscrew type actuator for controlling the positioning of a valve device. A control circuit is responsive to pulsed drive signals for driving a synchronous...
4070605 Polyphase power control  
Power control apparatus and method for controlling polyphase excitation of a polyphase load. A first sequence of timong pulses are generated to represent each zero level voltage crossing of every...
3596160 INTERLOCKING DIRECTIONAL CONTROL AND BRAKING CIRCUIT FOR BRUSHLESS DC MOTOR  
A control circuit for a reversible brushless DC motor (BDCM) includes first and second channels to supply clockwise and counterclockwise command signals to the motor in response to corresponding...
3596156 CONTROL SYSTEMS FOR CRANES  
A control system for an electric crane or hoist motor supplied through thyristor circuitry wherein the lifting and lowering speed and travel is controlled by saw tooth voltage generators which...
3551740 LIMIT CONTROL FOR AN ALTERNATING CURRENT MOTOR  
3376485 Control system for polyphase induction motors  
3345548 Electric hoist control system  
3296512 Controlled braking system for load lifting apparatus  
3189290 Tape drive and recording apparatus  
3183423 Limit control for motors  
3105181 Limit control for motors  
3090899 Control circuit for a. c. motor hoist  
2785364 Centrifugal drives  

Matches 1 - 24 out of 24