pbl37761 ETC-unknow, pbl37761 Datasheet - Page 8

• Manufacturer Part Number: pbl37761
• Description: Dual Controller High Current Stepper Motor Applications
• Manufacturer: ETC-unknow

PBL 3776/1
Figure 10. Stepping modes.
for more information on implementing modified half step.
Ordering Information
Package
Plastic DIP Tube
Information given in this data sheet is believed to be
accurate and reliable. However no responsibility is
assumed for the consequences of its use nor for any
infringement of patents or other rights of third parties
which may result from its use. No license is granted
by implication or otherwise under any patent or patent
rights of Ericsson Components. These products are
sold only according to Ericsson Components' general
conditions of sale, unless otherwise confirmed in
writing.
Specifications subject to change without
notice.
1522-PBL 3776/1 Uen Rev. D
© Ericsson Components AB 1999
Ericsson Components AB
SE-164 81 Kista-Stockholm, Sweden
Telephone: [phone]
8
Phase
Phase
Dis
Dis
–100%
–140%
–100%
–140%
V
140%
100%
V
140%
100%
I
140%
100%
I
140%
100%
MA1
MA2
R1
R2
1
2
2
1
Full step mode
PBL 3776/1NS
Half step mode
Part No.
Modified half step mode
is made. The motor will then have taken
two half steps equalling one full step in
rotary movement. The cycle is repeated,
but on the other phase. A total of eight
states are sequenced until the initial state
is reached again.
tial resonance problems. Resonances
appear as a sudden loss of torque at one
or more distinct stepping rates and must
be avoided so as not to loose control of
the motor´s shaft position.
mode is the reduced torque in the half
step positions, in which current flows
through one winding only. The torque in
this position is approximately 70 % of the
full step position torque.
Modified half-step mode.The torque
variations in half step mode will be elimi-
nated if the current is increased about
1.4 times in the halfstep position. A
constant torque will further reduce
resonances and mechanical noise,
resulting in better performance, life
expectancy and reliability of the mechani-
cal system.
done by bringing the reference voltage
up (or down) from its nominal value
correspondingly. This can be done by
using DACs or simple resistor divider
networks.
Half-step mode can overcome poten-
One disadvantage with the half-step
Modifying the current levels must be
See SMD and application handbook