Introduction: Brushless DC Electric Motor (with Hall Sensor)
This DCelectric motor project uses a Hall sensor to detect the position of the rotor and turn on the electromagnet in the precise moment.
Step 1: Overview of Device
Step 2: Circuit Diagram & Main Components
Sensor: UGN-3503-U hall sensor
IC1: LM358N (dual OP amp)
IC2: CD4001 (quad NOR gate )
FET1: IRFD120 (N-channel power mosfet)
This circuit is the same I used in my previous post "magnetic pendulum" . For additional details, refer to post.
Step 3: Hall Sensor
Step 4: Direction Detector
Step 5: 20mS Monostable ( Electromagnet ON Time )
Step 6: Output Mosfet Drives Electromagnet
Step 7: Electromagnet & Rotor Details.
IMPORTANT:
1) electromagnet north pole UP
2) rotor north poles OUT
3) hall sensor branded side UP
3 Comments
7 years ago on Introduction
ok right
7 years ago on Introduction
Hi,
Can I suggest a reverse biased diode across the coil to stop back emf from damaging any of the other components.
Reply 7 years ago on Introduction
You´re right, a reverse diode on coil is generally recommended. I didn´t include one because IRFD120 (FET) breaks down over 100V, and has an internal avalanche diode protection across SD that will clamp short transients above that voltage. The rest of the components run no risk. Thank you!