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I need to build controller for DC motor 440V and 100 Amp. Can you help with diagramm?
Gonna take a lot of courage to throw that switch.
thanks for this, but how control the motor freq.? to switch off some rectifiers?Been awhile but you are looking at a circuit similar to the attached to use one as an example. These are big SCRs for DC motors of high HP used in industrial applications. I remember circuits like the attached as well as circuits using large mercury arc rectifier tubes. The attached is rough and does not contain the SCR firing circuit but something along those lines is what you want for a 100 Amp 440 volt DC motor. SCRs like these have big heat sinks and forced air cooling. You also may want to look at thyristor circuits.
Unfortunately you don't provide details on the DC motor? Like how it is wound.
Ron
This motor is used in sausage cutter Zeydelmann. Its actually not working properly, at only one fixed frq 1500 RPM. I thought to build quickly PWm controller on thyristorsLMAO, actually they aren't all that bad. Generally you ramp the motor up to speed. The SCRs in them resemble a hockey puck. Then you have some large diameter cables for 100 amp service. I don't see as many large DC motors as I once did but I once saw like a 500 HP DC motor. Biggest motors I deal with today are 25 to 40 HP 480 VAC 60 Hz. motors and then only once in a while. Still don't know exactly what type DC motor the OP has so it's really hard to suggest much. However, motor controllers like that you generally buy a commercial drive for. Rockwell Automation and Reliance Electric come to mind.
Ron
thanks for this, but how control the motor freq.? to switch off some rectifiers?
You said it was a DC motor. There is no frequency exactly. You may be able to use PWM. However you haven't said how this motor is wound (configured). Like, how many wires exit the motor frame? How was it previously speed controlled? This must be an awfully large sausage cutter if it was powered by 440 Volts at 100 Amps. There are several ways to control speed of a large DC motor and the type motor plays a roll in the speed control.
Ron
A variable-frequency drive (VFD) is a system for controlling the rotational speed of an alternating current (AC) electric motor by controlling the frequency of the electrical power supplied to the motor.[1][2][3] A variable frequency drive is a specific type of adjustable-speed drive. Variable-frequency drives are also known as adjustable-frequency drives (AFD), variable-speed drives (VSD), AC drives, microdrives or inverter drives. Since the voltage is varied along with frequency, these are sometimes also called VVVF (variable voltage variable frequency) drives.