Hi there everyone.
This is my first post here, I won't lie, and I am already looking for help.
i came across this forum in searching for an answer to my problem.
I am building an electric bike that will automatically shift up and down at a certain speed by changing the motor windings from star to delta on the fly using relays. This is not a problem. A speed sensor will put line 'a' to ground after the speed is reached and until the bike falls below that speed again. The ground line feeds the relays that switch the motor.
The concern I and others have is that when the relay tries to switch over it will open the phases on the motor for about 30-40ms and if you are on the throttle it will put load on the motor and could damage the controller. It may last a long time but I would like to find a fix for this anyways.
The simple fix is to disable the throttle for 50ms whenever the relay switches.
If I place a normally closed reed relay in the throttle 5v+ and have it actuated it will disable the throttle.
So here is what we need:
When line 'a' goes to ground (motor upshifts) the reed relay is opened for 50 ms (5v relay) and when line 'a' ceases going to ground reed relay opens again for 50 ms. (Reed relay could be replaced for something that actuates faster).
Essentially I need small circuit that will power the reed relay for 50 ms when line 'a' becomes grounded and again whenever it is no longer grounded.
This in effect will turn throttle off directly when motor is shifting placing a lot less load on motor and controller I believe.
i have found the 555 chip that may work but my problem is figuring out a circuit that will also trigger when line is no longer ground.
Any help or suggestions would be appreciated!
Caleb
This is my first post here, I won't lie, and I am already looking for help.
i came across this forum in searching for an answer to my problem.
I am building an electric bike that will automatically shift up and down at a certain speed by changing the motor windings from star to delta on the fly using relays. This is not a problem. A speed sensor will put line 'a' to ground after the speed is reached and until the bike falls below that speed again. The ground line feeds the relays that switch the motor.
The concern I and others have is that when the relay tries to switch over it will open the phases on the motor for about 30-40ms and if you are on the throttle it will put load on the motor and could damage the controller. It may last a long time but I would like to find a fix for this anyways.
The simple fix is to disable the throttle for 50ms whenever the relay switches.
If I place a normally closed reed relay in the throttle 5v+ and have it actuated it will disable the throttle.
So here is what we need:
When line 'a' goes to ground (motor upshifts) the reed relay is opened for 50 ms (5v relay) and when line 'a' ceases going to ground reed relay opens again for 50 ms. (Reed relay could be replaced for something that actuates faster).
Essentially I need small circuit that will power the reed relay for 50 ms when line 'a' becomes grounded and again whenever it is no longer grounded.
This in effect will turn throttle off directly when motor is shifting placing a lot less load on motor and controller I believe.
i have found the 555 chip that may work but my problem is figuring out a circuit that will also trigger when line is no longer ground.
Any help or suggestions would be appreciated!
Caleb