User Manual

TMCM-1630 Hardware Manual (Rev. 1.02 / 2012-JUN-11) 16
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8.1.3 hallFX™ - hall sensor feedback
hallFX™ provides emulated hall sensor signals. The emulated hall sensor signals are available without a
phase shift and there is no error-prone PLL necessary, like with many other systems, nor is the knowledge
of special motor parameters required. Since it is based on the motors’ back-EMF, a minimum motor velocity
is required to get a valid signal. Therefore, the motor needs to be started without feedback, until the
velocity is high enough to generate a reliable hallFX™ signal.
Please refer to the TMCM-1630 Firmware Manual for further information about using hallFX™.
Figure 8.2: hallFX™ block diagram and timing
A switched capacitor filter for each coil supplies the measured effective coil voltages. Its filter frequency can
be adapted to the chopper frequency and the desired maximum motor velocity. An induction pulse
suppressor unit gates the commutation spikes which result from the inductive behavior of the motor coils
after switching off the current. The gating time can be adapted by an external capacitor to fit the motor
inductivity and its (maximum) velocity.
Low pass LPU
Low pass LPV
Low pass LPW
PSG
E1
E3
E2
U
LP
V
LP
W
LP
Position signal
generation (PSG)
Induction pulse
supressor (IPS)
IPS
E1
E2
E3
U
V
W
H1
H2
H3
D
BM1 H1
D
H2
D
H3
BM2
BM3
A
SP_SUP
30k
A
30k
A
30k
A
FILT3 FILT2 FILT1
C
SUP
D
SC_CLK
Switch Cap filters
ENRS_TEST