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TMC4671 Datenblatt(PDF) 46 Page - TRINAMIC Motion Control GmbH & Co. KG.

Teilenummer TMC4671
Bauteilbeschribung  Encoder Engine: Hall analog/digital, Encoder analog/digital
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Hersteller  TRINAMIC [TRINAMIC Motion Control GmbH & Co. KG.]
Direct Link  http://www.trinamic.com
Logo TRINAMIC - TRINAMIC Motion Control GmbH & Co. KG.

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TMC4671 Datasheet • IC Version V1.00 | Document Revision V1.04 • 2018-Dec-11
46 / 157
4.8.6 PI Velocity Controller
The P part is represented as q8.8 and I is the I part represented as q0.15.
4.8.7 P Position Controller
For the position regulator, the P part is represented as q4.12 to be compatible with the high resolution
positions - one single rotation is handled as an s16. For the advanced controller structure the P part is
represented by q8.8.
4.8.8 Inner FOC Control Loop - Flux & Torque
The inner FOC loop ( gure 26) controls the
ux current to the
ux target value and the torque current to
the desired torque target. The inner FOC loop performs the desired transformations according to
gure 27
for 3-phase motors (FOC3). For 2-phase motors (FOC2) both Clarke (CLARKE) transformation and inverse
Clarke (iCLARKE) are bypassed. For control of DC motors, transformations are bypassed and only the
rst
full bridge (connected to X1 and X2) is used.
The inner FOC control loop gets a target torque value (I_Q_TARGET) which represents acceleration, the rotor
position, and the measured currents as input data. Together with the programmed P and I parameters,
the inner FOC loop calculates the target voltage values as input for the PWM engine.
Figure 26: Inner FOC Control Loop
4.8.9 FOC Transformations and PI(D) for control of Flux & Torque
The Clarke transformation (CLARKE) maps three motor phase currents (IU , IV , IW ) to a two-dimensional
coordinate system with two currents (Iα, Iβ). Based on the actual rotor angle determined by an encoder
or via sensorless techniques, the Park transformation (PARK) maps these two currents to a quasi-static
coordinate system with two currents (ID, IQ). The current ID represents ux and the current IQ represents
torque. The
ux just pulls on the rotor but does not affect torque. The torque is affected by IQ. Two PI
controllers determine two voltages (UD, UQ) to drive desired currents for a target torque and a target
ux. The determined voltages (UD, UQ) are re-transformed into the stator system by the inverse Park
transformation (iPARK). The inverse Clarke Transformation (iCLARKE) transforms these two currents into
three voltages (UU , UV , UW ). Theses three voltage are the input of the PWM engine to drive the power
stage.
©2018 TRINAMIC Motion Control GmbH & Co. KG, Hamburg, Germany
Terms of delivery and rights to technical change reserved.
Download newest version at www.trinamic.com


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