Oil circuit – hydraulic system
Motor for hydraulic pump V401
Torque to the
Design
hydraulic pump
Like conventional, smaller DC electric motors, the
brushless DC motor also consists of a stator and a
rotor. Whilst the stator consists of permanent magnets
and the rotor of electromagnets in the conventional,
smaller electric motor, the opposite is true in the case
of the brushless DC motor.
Rotor with permanent
magnets
The rotor consists of 6 permanent magnet pairs and
the stator of 6 electromagnet pairs.
Electrical connection
Electromagnet pole pairs
How it works
In the conventional DC motor, commutation (current
direction change-over) takes place via ring contacts.
lk
Commutation in the brushless DC motor is carried out
by the mechatronic unit's electronic control unit and is
therefore contact-free.
S390_085
The stator coils are actuated in such a way that a
rotating magnetic field occurs in the stator coils.
The rotor follows this magnetic field and is therefore
caused to rotate.
Stator
Thanks to contact-free commutation, the DC motor
runs entirely wear-free, with the exception of bearing
wear.
Stator
Rotor
S390_089
38
English 