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MY20K10-02_1.0_10.11.2020 16
Overview
In the case of motors, this heat is dissipated to the
fork end or rear of the bicycle frame via a large
contact surface on the motor interior (stator
support). Cooling fins inside and outside the drive
casing ensure maximum heat exchange with the
surrounding area. Any heat that cannot be
dissipated causes the drive motor to heat up.
The wheel hub motor monitors both the supplied
energy and the temperatures reached in the
motor. This prevents damage due to overheating
caused by an overload situation. However, this
causes a reduction in the motor power that the
rider can use so that overheating can be
prevented.
The higher the temperature rise in the engine, the
less driving power there is that can be accessed
and the less assistance there is available. If the
engine cools down, the energy supply is
increased again and the driving power increases.
Important: the motor cannot be damaged by
heating.
IMPORTANT: the motor cannot be damaged by
heating. Control of the driving power in relation to
the motor temperature is continuously variable to
ensure assistance is always available but the
motor cannot be damaged by overheating.
PRACTICAL USE: In daily use, the points listed
above depend on the outside temperature, the
total weight, the gradient, the ground conditions,
the pedalling rate, the air pressure and the speed.
These factors can lead to a temperature being
reached that reduces power or assistance.
However, this does not mean that the drive is
faulty or is failing. The rider can continue their ride
with a low level of assistance.
EXTREME EXAMPLE: A gradient of 12% over
500 metres of altitude, a total weight of 120 kg, a
maximum assistance level, a driving speed of
< 10 km/h and a pedalling rate of 60 rpm mean
that the bike is operating under unfavourable
conditions with low efficiency, a reduced range
and high heat emission. This may lead to a
reduction in driving power.
Recovery
The motor can recharge the battery as a generator
(recovery). Electricity is generated to charge the
battery. Recovery also causes a gentle braking
effect. The lower the battery level is, the harder
the braking effect is felt.
The two recovery levels can only be activated if
the following conditions are met:
Recovery can only be activated within a speed
range between 6 and 75 km/h. Recovery cannot
be activated when the vehicle is stationary or
travelling at under 6 km/h.
The battery temperature must be greater than
0 °C. Recovery is automatically deactivated
under 0 °C.
If the battery exceeds the maximum charging
temperature of 50 °C, the battery's charging
function is deactivated and recovery cannot be
used. This function is enabled again as soon as
the battery falls below this temperature limit.
The battery charge level is less than 90%.
3.1.4.2 Rechargeable battery
The battery has an internal electronic protection
circuit, which is specifically designed for the
charger and the S pedelec. The battery
temperature is monitored at all times. Each
individual cell in a battery is protected by a steel
cup and cased in a plastic housing. You must not
open this housing. You must also avoid
mechanical loads or exposure to intense heat
since they may damage the battery cells and
cause flammable contents to leak out.
The battery is protected against deep discharge,
overcharging, overheating and short circuit. In the
event of a hazard, a protective circuit switches the
battery off automatically.
The battery has a high energy content when
charged. The substances in lithium-ion battery
cells may become inflammable under certain
conditions. You will find codes of practice for their
16


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