Bosch DOK-MOTOR-MCL Series, Project Planning Manual

Page: 10 / 196

1.2 Construction ironless linear motors
Ironless linear motors MCL consist of the components primary and secondary
part and have an optional Hall unit .
The ironless primary part bears the electrically active part of the linear motor
with a winding, cast in plastics. The primary part carrier made of aluminum
serves to assemble the primary part and for heat dissipation out of the pri‐
mary part. A fastening of an optional Hall unit for position recording is pre‐
pared on the primary part. Additionally, a temperature sensor is placed in the
winding. Hall unit and temperature sensor are available for all MCL, except
for the smalles frame size.
The secondary part consists of an u-shaped iron yoke. The legs of the yoke
bear permanent magnets and surround the primary part. The line is built with
the secondary parts and can be realized as long as required.
The motor designation depends on the ironless primary part. The designation
is as follows:
●
MCL: Motor Coreless Linear
● MCL: Motor Coreless Primary part
● MCS: Motor Coreless Secondary part
Fig. 1-1: Rexroth MCL example
1.3 Comparison ironless with ferreous linear motors
Ferreous linear motors use the iron, in which the winding is inserted to bundle
the magnetic flow. Therewith, a very high force density is reached. Act up to
a principle, very high magnetic attractive forces exist among the motor com‐
ponents (primary and secondary part). These lead to detent force and due to
saturation effecst to other parasitic effects, such as e.g. winding influences
for ripple of the operation force.
No attractive forces exist among primary and secondary part towards ferre‐
ous linear motors. Detent forces due to a slotting, existing for ferreous linear
motors are also not created. These aspects and the relatively small moved
mass of the primary part allow a vergy high dynamic with high precision at
the same time.
Additionally wearing mechanical components are not necessary due to direct
installation into the machine. Due to not existing mechanical elements, a
backlash free, with minimum or without hysteresis afflicted drive train, is
available.
Bosch Rexroth AG DOK-MOTOR*-MCL********-PR05-EN-P 8/193
Rexroth IndraDyn L Ironless Linear Motors MCL
Rexroth MCL - Product presentation