Motor controller

[tintin_VN]

I really need help in the project which is motor controller. Somebody can help me with the circuit (electric motor, power electric converter, and control circuit). I will use the DC-motor:
1) Bi-direction
2) Start by push bottom
3)Speed control (faster or slower, and without jerking at low speed)
4) Breaking.

Thank you a lot in advance

 

[edman222]

I don't know how you plan to use this, as in will this be driven by a micro controller or something else..
What size motor? how much current draw?

If you want something cheep and simple up to 1Amp just get a SN754410 HBridge,and a hex inverter.
You can hook a motor to the Hbridge and the Hbridge inputs to a Micro controller ( one to a hex inverter and to the same MCU pin as the other input).
Set the micro to do Pulse-width and vary the Pulse width to get smooth speed control both backwards and forwards, as well as a limited braking. Start by push button? not sure how you would get that without a micro controller ....

Perhaps you can also use a 555 timer to generate a pulswidth and vary it with a POT, and have a push button to turn it on and off. It would accomplish the same task as an MCU without the need to program anything...(still need an H-bridge) If this sounds like what you need let me know I can post up a quick schematic...

 

[tintin_VN]

Edman222,
Thank for your help. The motor size is free of choice. It is just require that need to have a power converter (because we plug in the 120 V outlet), and a control circuit.
Can you please post the schematic include the power converter and control circuit?
Thanks so much

 

[edman222]

Wait so this is a 120V motor???
err I was talking more like 5-30v ish (1amp max).

Or are you planing to use a 120V-12V transformer, then circuit to motor?
What exactly are you planing on driving with this motor, and what voltage and current would it require?

 

[cvjoy]

i think he like me is trying to create a robot with variable speed running on a variable power supply plugged to a 120V outlet(i am in india so i plug to a 240V outlet)

 

[4pyros]

Do you need to make it or can you buy it thare are many on the market. Andy

 

[edman222]

In case some one wants something like this.. (2amps max with var speed and direction..)
You can use a 555 or mcu to generate the PWM and vary the duty cycle.
Sorry if the schematic is a bit messy! But i think its quite self explanatory if you grab a data sheet of the parts

**broken link removed**