Bosch rexroth MCL, Руководство по планированию проекта

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7 Accessories and options
7.1 Hall unit
7.1.1 General
For control of synchronous motors, the absolute position information regard‐
ing a pole pair is required to recognize the position of the permanent magnets
to the motor windings. Only in connection with an electrical commutation off‐
set angle to be determined on initial commissioning, the current with correct
phase position to the magnetic field can be set via the controller to enable
generation of a defined force in the dedicated travel direction by the motor.
If an incremental length measuring system is used, commutation of the axis
has to be performed every time the phase of the drive is step up. This is real‐
ized by a drive-internal procedure. Subsequently, the motor power can devel‐
op.
The commutation is determined automatically during the phase
step up by the Hall unit. Therefore, no power switch-on is neces‐
sary (no motor movement).
The Hall unit offers special advantages, for commutation of linear motors, for
example ...
●
in gantry arrangement
● at vertical axes
● in mechanically secured state,
● that must not be moved for safety reasons during commutation.
7.1.2 Hall unit function
The Hall unit (analog or digital) serves for motionless commutation of the line‐
ar motor in connection with an incremental measuring system. For IndraDrive
Cs, the motor commutation is performed automatically on phase switching to
operating mode. For this, motion is not required. The motor may also be in a
fixed stop or positioned at the end of the travel length (end stop), for exam‐
ple.
Rexroth linear motors of MCL020 ... 070 series can be ordered according to
the motor type code with or without Hall unit (see chapter 6.1.2 "Type codes
primary part MCP" on page 61 ).
Independent from the origin order, primary parts of frame size
020 ... 070 can be converted or upgraded with a separately order‐
able Hall unit.
MCL Ironless Linear Motors 77/197
Accessories and options
R911330592_Edition 06 Bosch Rexroth AG