Technical Support - MDM
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599 77 39-16 Rev. 00
11.8.2.2 Direction of rotation of the motor
The direction of rotation of the motor depends on how the windings of the stator and rotor are connected
to one another. This connection is made by the circuit board relay contacts.
Clockwise rotation Anti-clockwise rotation
EC Electronic control
P Overheating cut-out (motor)
S Stator
M Rotor
T Tachometric generator
TY TRIAC
K3, 4 Inversion relay
11.8.2.3 Tachometric generator
The speed of the collector motor, like all motors with serial excitation, depends on the load; so the speed
decreases as the load increases. This makes it necessary for the power supply voltage to the motor, and
therefore its speed, to be constantly controlled by an electronic speed control.
A tachometric generator, consisting of a magnet secured to the shaft and a coil, generates a voltage
depending on the speed of the rotor, which is sent to the electronic control.
All the electronic controls have a protection system, which is more or less sophisticated, to avoid the
operation of the motor in the event of a failure in the tachometric generator.
EC Electronic control
P Overheating cut-out (motor)
S Stator
M Rotor
T Tachometric generator
TY TRIAC
K3, 4 Inversion relay
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