Timer Circuit design needed... Help !!!

[WyoTom]

Hello,
I wonder if you could help me with a timer circuit I need? I need to be able to have a small AC 120 volt, brushed motor run in one direction for say 10 seconds, then stop for about 1 second, then reverse for 10 seconds, and so on. I'm thinking it'll need a two coil relay with a center normally open. It'll need to be as simple as possible, and run on 120 volts ac. Do you have any idea how I could achieve this ???
Thank you for any help you may be able to offer...

 

[danadak]

Simple to code, drag and drop blocks, flexible. Use a SSR to drive the motor.

Pulse Sequence Generator / Smart Timer

Often users, developers, hobbyists need timed and qualified event generators, many resorting to 555 timers and the like. The venerable 555 has had a long run but its limited in accuracy and capability. This approach uses block language to create...

www.electro-tech-online.com

Or store bought appliance timer, maybe two, to effect reversal. There are timers with triggers......

Regards, Dana.

 

[crutschow]

I need to be able to have a small AC 120 volt, brushed motor run in one direction for say 10 seconds, then stop for about 1 second, then reverse for 10 seconds

How do you reverse this brushed AC motor?
Reversing the connections on an AC motor has no effect on its rotation direction.

 

[WyoTom]

The motor can be reversed by energizing one of two field coils, I think, anyway. Right now the motor is reversed by a manual switch. The neutral of the 120 volts goes to one end of both coils, the live goes to the other end of one coil or the other.

 

[WyoTom]

Simple to code, drag and drop blocks, flexible. Use a SSR to drive the motor.

Pulse Sequence Generator / Smart Timer

Often users, developers, hobbyists need timed and qualified event generators, many resorting to 555 timers and the like. The venerable 555 has had a long run but its limited in accuracy and capability. This approach uses block language to create...

www.electro-tech-online.com

Or store bought appliance timer, maybe two, to effect reversal. There are timers with triggers......

Regards, Dana.

LOL... At my age, remembering the 4 digit combination to my front door is about as near to coding as I can manage. When I went to college, I learned on vacuum tube equipment. I may be able to pull off a 555 design or something like that, but microcontrollers are out...

 

[WyoTom]

Simple to code, drag and drop blocks, flexible. Use a SSR to drive the motor.

Pulse Sequence Generator / Smart Timer

Often users, developers, hobbyists need timed and qualified event generators, many resorting to 555 timers and the like. The venerable 555 has had a long run but its limited in accuracy and capability. This approach uses block language to create...

www.electro-tech-online.com

Or store bought appliance timer, maybe two, to effect reversal. There are timers with triggers......

Regards, Dana.

At my age, remembering the 4 digit combination to my front door is about as near to coding as I can manage. When I went to college, I learned on vacuum tube equipment. I may be able to pull off a 555 design or something like that, but microcontrollers are out...

 

[Bluejets]

Series ac motor requires reversal of armature in relation to both field coils.
Problem is, some series motors do not take kindly to reversal due to the lead lag placement of the brushes.
Result is usually a lot of sparking and eventually catastrophic burn up.
Stopping would, if all above not applicable, require much more than 1 second and use of break before make as well as some degree of interlock.

 

[crutschow]

Below is the LTspice sim of a circuit using two 555 timers to do what you want:
U1 is configured as an astable multivibrator that generates a 10s ON, 1s Off signal to the motor power relay U4 (green trace), and U3 is configured as a toggle flip-flop to flip the motor-field reverse relay U2 at the end of each motor ON period (yellow trace).
The 100kΩ Pot U5 adjusts the ratio between U1's On and Off time.

Would you be able to build that on a perfboard?

 

[danadak]

Reversing direction of an AC universal motor

The problem: I have a table saw motor I am trying to use in a jointer and need it to spin in the opposite direction (permanently). I have had trouble finding an answer that I am reasonably sure app...

electronics.stackexchange.com

How To Reverse The Direction Of A Single Phase AC Motor

To complete a single phase motor direction change, you will need to reverse the polarity of the starter winding. This will cause the magnetic field to change directions, and the motor will follow. In order to achieve this, you can swap the connections on either end of the winding.

www.hunker.com

 

[Bluejets]

Op said "brushed motor".