I am trying to build a motorized cable drum which retracts the cable lying on the ground. I am using a 165rpm 1.3Nm (continuous torque) spur geared DC motor. I have a small sprocket (05-B1 standard, 22 teeth) connected to the motor shaft and have a bigger sprocket (05-B1 standard, 50 teeth)...
I have interfaced a smart energy meter IC (ADE7878) to a microcontroller. The datasheet of the IC can be found here, http://www.analog.com/media/en/techn..._7868_7878.pdf. As per the datasheet, on page 50 total active power of each phase can be read from the registers AWATTHR, BWATTHR, and...
I am using a smart energy meter which allows me to set the CT ratio among other parameters. I am using 50/5 ratio AC CT's. For the meter to do the kwh calculation correctly, I believe I have to set primary CT ratio to 50 and secondary CT ratio to 5. Now, if I have two rounds of the same 120 volt...
I am developing a motorized cable reel. I am using a geared DC motor to drive central cable drum on which the cable rests. This cable reel is only used to automatically retract the cable back once the cable is pulled out. The cable is pulled out manually by hand from the cable reel. I am using a...
Hello All. I am trying to make make a digital measurement tape (Round type which retracts back once pulled out and let go). So, as the tape or thread is pulled out, the distance sensor should be able to detect how much length has been pulled out. I had a hall sensor and a few magnets in mind...
I am making a motorized cord reel. I am using a stepper motor with a gear with a gear ratio of 8:1. I need to run my application at 100 RPM. To retract the cord reel at 100 rpm at the output of the gear shaft , I need to run the motor at 800 rpm since gear ratio is 8:1. The torque at the motor...
The bipolar geared stepper motor I am planning to use has a resistance/ phase of 8.5 ohms per phase, inductance of 2.14mH per phase , normal current per phase is 2 amps, holding torque of motor is 0.8Nm, gearbox ratio is 1:8, holding torque of gearbox is 6.4Nm. The maximum permissible RPM of...
I was looking to build a RFID operated turnstile similar to picture below. I will have RFID readers on both ends where the door would open from either end only if the RFID is authenticated on either end. I was wondering what are the type of locks used in these turnstiles which open the...
Hi. I am using a motorized AC power cable reel for my electric charging station. The AC cable reel uses a industrial socket which is connected to the plug in the vehicle. I am facing two challenges here. One is that the socket gets damaged with frequent usage as it brushes against the road. To...
Hi. I am using a motorized AC power cable reel for my electric charging station. The AC cable reel uses a industrial socket which is connected to the plug in the vehicle. I am facing an issue here. The socket gets damaged with frequent usage as it brushes against the road. To solve this I was...
