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Tachometer for electric trolling motor

Discussion in 'Sensors and Actuators' started by jfroage, Jul 29, 2013.

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  1. jfroage


    Sep 20, 2011
    I have a motor guide trolling motor on a Lowe 170 boat. The trolling motor is wireless with a foot and a ket fob control. This is a brushless d.c. motor that runs on 12 volts dc. I need some ideas on building a tachometer so I know about how fast the motor is running. Anyone know of a tach available on the market or how to build one? Thanks.
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    I would suggest that an ammeter in series with the power to the device will give you a good indication of the power it is developing.

    Note that this may well increase if the motor gets fouled where a tachometer would decrease. In this case the ammeter is telling you how much power is being delivered to the motor. Assuming it isn't jammed, this will have a strong relationship with the propulsive power that is being generated.
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