12
special applications of this ESC. After initializing
the KOBY gives the cell count of identified LiPo
cells via an acoustic signal.
4.1 Properties
Sensorless, no sensor signals from motor are
required
Mode programming
Updateable online
EMF-brake with variable brake rate, can be
disabled
Automatic
under
voltage
disconnection,
adjustable and detachable. Reducing power,
instead of switching off is possible.
Adjustable BEC output voltage
Unlimited part load capability
Analysis of switching-off reason
Adjusting monitored by LED or audio signal
Very sensitive control characteristic due to
precise RPM control
Via dynamic timing sensing and computing of
actual operation data
Start protection at power up, blocked motor
protection, over temperature protection, over
current limitation
Digital microprocessor control, therefore no
thermal drift
Developed and produced in Rottenburg,
Germany
4.2 BEC
All KOBY ESCs include a switched BEC.
Compared to general BEC-systems the capacity of
the BEC is mostly independent from the input
voltage. This allows the usage of the BEC also at
higher voltages. Also, the BEC features a high
suppression of interference. The BEC-Voltage can
be changed between 5 V and 8 V (0.2 V steps.
For safety reasons a four cell NiCd/NiMH or
a two cell LiPo battery must be connected
to the receiver in parallel to the BEC.
Using this ESC without BEC is possible by pulling
the red strand off the connector or by ripping this
cable.
4.3 Toroidal core
The toroidal core on the receiver cable allows
suppression of interference and must not be
removed from the cable for security reasons.
4.4 Under voltage disconnection
Each KOBY ESC includes an automatic under
voltage disconnection at 3 V / cell. It switches the
motor off if the battery pack is on low capacity. The
motor can be switched on again, by pulling the
throttle into motor-off position and then pushing it
forward again.
4.5 Cooling / Fixing
Sufficient cooling increases efficiency and lifespan
of the ESC. The KOBY ESC improves performance
with increased cooling. Do not fix KOBY ESCs on
their body. Use cable ties to fix the KOBY on its
cables and / or hook and loop tape to fix the KOBY
on the sticker side.
4.6 Part load capability
Due to its active freewheeling circuit the KOBY
ESC can be operated in part load conditions if at
full throttle and full load the battery current does
not exceed the KOBY continuous current limit.
(e.g. KOBY 90 LV < 90A).
4.7 Active freewheeling circuit
To optimize the efficiency at part load and to
reduce heating the KOBY ESC features an active
freewheeling circuit.
4.8 Sensorless Commutation
KOBY ESCs work without sensors inside the motor
via a 3D recognition system. Commutation of the
motor will automatically be optimized to the
application. Thus the KOBY cannot detect the
motor position at zero RPM. Therefore little motor
oscillation during start is possible.
5
Connection of cables
Version
Cable Ø motor
Cable Ø battery
KOBY 40 LV
2.5 mm
2.5 mm
KOBY 55 LV
2.5 mm
2.5 mm
KOBY 70 LV
4 mm
4 mm
KOBY 90 LV
4 mm
6 mm
5.1
Connection to Receiver
Due to 3A continuous current and 10A peak
current KOBY ESCs allow the use of high
performance digital servos and flybarless systems.
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