91 GOVERNOR MENU E - Throttle
signal divider
This page is a translated version
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of the page Manuals:MBPlusFblV52:Governormenu E
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and the translation is 100% complete.
When using electric motors the rpm sensor signal usually consists of the (electric) field
speed. In order to obtain the actual engine speed the field speed must be divided by half
the number of motor poles. Using a 2-pole motor thus the measured speed corresponds
to the motor speed. With a 10-pole motor on the other hand the field speed is five times
higher than the actual speed. Also for nitro/gas engines the measured speed of the sensor
may be higher than the actual speed. For example when a magnetic sensor is installed and
more than one magnets are used for measuring the rotational speed, the rpm output will
be multiplied by the number of magnets. So when two sensor magnets are used the rpm
signal from the sensor will be twice the engine revolutions. So in order the rotor speed
matches the rotor speed you set with the transmitter you must specifiy the factor by how
much the incoming rpm signal must be divided to get the actual motor rpm.
The motor poles of an electric motor can be easily determined by counting the
number of magnets built into the motor housing. Each magnet corresponds to
one magnetic pole. Note that on some motors pairs of magnets are used rather
than one single large magnet. These pairs together form just one magnetic pole! If
in doubt refer to the datasheet of the motor or ask the manufacturer or your local dealer.
To determine the number of magnets that are used for a magnetic rpm sensor in a nitro
helicopter, you can use the Sensor Test mode of GOVERNOR MENU (Menu point
A). Each time a magnet passes the sensor the Status-LED will light up in blue color
there, i.e. when you turn the clutch bell by hand. So you simply count how often the
Status-LED lights up during one rotation. Then this is the divider you have to setup.
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