Week 13 Progress

Discussion

The major problem of this project is noise in electrical and electronic circuit. Generally, noise is interference frequency or signal has happened at electronics or electrical components. In every electrical or electronic device, noise is a common problem which, to reduce it, selection of good electronic and electrical components is important to minimize noise. Although in circuit design the method of noise suppressing has been implemented, noise can still happen. This is because; the way of the wiring of the whole circuitry and other things can still produce noise. Among the things that can cause noise are:

                    i.            Along the motor wires.

                  ii.            By radiation from the motor body and wiring.

                iii.            From the motor body through it’s mounting.

                iv.            It happens of component that does not can function or damaged.

Although noise can cause lots of problems to the system, it can’t be killed. These methods can be used to minimize the noise in the system are:

                    i.            Make sure the gear of motor free from corrosion and in generally good condition.

                  ii.            Make sure dirt cannot get into the motor especially through the ventilation holes.

                iii.            The wire of the motor supply current must be suitable such as multi core wire (ø3mm).

                iv.            Keep ‘hot’ wire far apart from each other.

‘Hot’ wires will generally be motor to controller and controller to the battery wires. The wires are considered hot because any two wires running parallel to each other for any distance interact because of mutual inductance and capacitance. If they must be in close proximity, screened cable must be used. For this whole project, other problems there were some identified either in mechanical and electrical parts. Problems of this project must be overcome to be sure function of project is the best and perfect. Others problems also can be found on this project are:

PROBLEMS	SOLUTION
Battery unsuitable because a current is lowest (1.2 amp).	This project using two power window motor which each motor can operate with minimum current (2 amp).To solve this problem, the high current battery must be use  to support both of power window motor (suggestion is 4 amp and above).
RPM of power window motor too high (3600 RPM for 12VDC).	For this project, selection of motor is important because the movement of this walker must be smoothly. To avoid this problem, RPM for this motor must be reduce by using the suitable gear motor (suggestion is 50RPM).