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Unread 03-02-2013, 10:45
iambujo iambujo is offline
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FRC #2729 (Storm)
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Re: Measuring motor speed

FYI - I just tested our Hall Latch sensor with a ring magnet on a Fisher Price 00801-0673 motor shaft. I got the motor up to max free speed (12V from a bench supply), and the sensor read 20220 RPMs, 337 Hz on my logic analyzer. The duty cycle was about 45% regardless of the motor speed so I figure that's based on the ring magnet's pole alignment. I feel the US1881 is an excellent device for measuring wheel/shooter/shaft speeds at pretty much any speed we could ever want.

Quote:
Originally Posted by iambujo View Post
Our board uses the US1881 Hall Latch. I hope to get it tested at higher speeds this weekend, with the ring magnets.