motors with cage-type rotors and those taken by d.c. machines, generally to the detriment of the a.c. machine. Although it is true that cage motors generally take starting currents in the range 4 to 7 times full load current whilst those of d.c. machines are normally much less, the ...
Starting and Speed Control of d.c. MotorsThe subject of speed control is vast, and it is only necessary here to outline the possibilities. A large amount of space has been devoted to thyristor converter systems, which have been the main growth area in recent years. For large industrial ...
By series resistance in parallel with the field winding of the motor. The resistance is then known as adiverter resistance. Another method used in traction consists of starting up two motors in series and then connecting them in parallel when a certain speed has been reached. Series resistances ...
An improved system for starting and changing speeds of motors of motorcycles and similar vehicles, characterized essentially by the fact of comprising a single lever which already serves to start the engine already for the change or selection of speeds, for which purpose, the core of this lever ...
T. Feb. 5. Cut-outs; switches.-Relates to switches for controlling motors. The main and rheostat switches are electricall... AH Adams,JT Mould 被引量: 0发表: 1903年 CONTROL SYSTEM FOR CONTROLLING OPERATION OF ELECTRIC CAR PURPOSE:To provide an arrangement which enables to impress a ...
2 traditional starting method 2.1 stator series reactor starting For squirrel cage induction motors, the stator circuit series reactor is used to start the classification, and the wound rotor asynchronous motor adopts the rotor loop series reactor to start. Stator side series reactor starting, that ...
control the flow of current in the motor and thereby maintain the desired speed. The speed control includes means responsive to a step start signal for generating the desired speed signal with predetermined values of jerk and acceleration. If the motor overspeeds, such as in a lowering load ...
CONSTITUTION:When motors 10, 11 connected with high voltage buses 4, 5 are started, a communication breaker 12 of the secondary side of a transformer is first closed by a start command. Then, breakers 7, 9 for auxiliary devices are closed by the AND condition of the closure confirmation ...
PURPOSE:To avoid concentration of current requirement by a method wherein the status showing a motor has reached a sufficient rotational speed is detected through a variation of a control voltage at a speed control circuit and afterward another motor is started. CONSTITUTION:A drum motor 1 is dri...
HIGH-SPEED INDUCTION MOTOR DRIVES: STARTING OPERATION CONTROL - ScienceDirect The problem here analysed concerns the drives providing the use of high speed induction motors. There is an increasing tendency to use this type of motors (having rated frequencies comprised between some hundreds and some ...