Driving a big amps circuit

SCR

Good answer Del.

If the devices will be moving people, I would want safety and redundant backups to prevent any harm to the people if a failure happen.

Charles

I'm thinking of PWM module that drives an IGBT circuit to supply the motor. Can anyone tell me what would be the drawback of that idea?

Regards

Complexity of the design and the cost of getting it certified for use in a human transport system in a public location could price your design right out of being feasible to use.

You may be better off to just use off the shelf motor speed control systems/devices for it.

Use a LASCR (Light Activated SCR) - sort of a Solid State Relay, which gets triggered by a light signal. The light signal itself is triggered by your electronic circuit.

If it's not a proprietary system, them make sure there is a hard-wired emergency stop circuit in place that kills the power to everything in the event of a logic error.

You did not say if it is an AC or Dc motor, there are Dc motor controllers which accept voltage or 20Ma signal inputs, these have extra inputs for safety interlocks etc.

I am not sure what your logic control would do with an escalator which would run at at constant preset speed with simple reversing controls unless you are anticipating varying conditions which have to be compensated for and need some sort of feedback to your logic control.?

I commend you for yr effort in making a logic control cct.But while you still continue on this research and having in mind the safety of life and property,kindly go for custom device already built for this purpose,if yr project is urgent.

Patrick Whowha