5SGX1445H0001 ABB SCR 5SHY series

Description

One major drawback to working with motors is the large amounts of electrical noise they produce. This noise can
interfere with your sensors and can even impair your microcontroller by causing voltage dips on your regulated
power line. Large enough voltage dips can corrupt the data in microcontroller registers or cause the microcontroller
to reset.

The main source of motor noise is the commutator brushes, which can bounce as the motor shaft rotates. This
bouncing, when coupled with the inductance of the motor coils and motor leads, can lead to a lot of noise on your
power line and can even induce noise in nearby lines.
There are several precautions you can take to help reduce the effects of motor noise on your system:
1) Solder capacitors across your motor terminals. Capacitors are usually the most
effective way to suppress motor noise, and as such we recommend you always solder at
least one capacitor across your motor terminals. Typically you will want to use anywhere
from one to three 0.1 uF capacitors, soldered as close to the motor casing as possible.
If you use one capacitor, solder one lead to each of the motor’s two terminals as shown to the right above.
For greater noise suppression, you can solder two capacitors to your motor, one from each
motor terminal to the motor case as shown in the picture to the right. For the greatest noise
suppression, you can solder in all three capacitors: one across the terminals and one from
each terminal to the motor case.
2) Keep your motor and power leads as short as possible. You can decrease noise by twisting the motor leads so
they spiral around each other.
3) Route your motor and power wires away from your signal lines. Your motor lines can induce currents in
nearby signal lines. We have observed voltage spikes as high as 20 V induced in completely separate circuits near a
noisy motor.

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