User’s Manual for FD556 Digital 2-Phase Stepper Driver
User’s Manual for FD556 Digital 2-Phase Stepper Driver
13 14
2. Connecting the Motor
For 6, 8 lead step motors, there are considerable differences in motor performance for
different coil connections.
3. Power supply Selection, Driver Voltage and Current Selection
1
）
Power Supply Selection
Generally Speaking, Higher supply voltage can increase motor torque at higher
speeds, thus helpful for avoiding losing steps. However, higher voltage may cause bigger
motor vibration at lower speed, and it may also cause over-voltage protection or even
driver damage.
2
）
Set Value of output current
For a given motor, higher driver current will make the motor to output more torque,
but at the same time causes more heating in the motor and driver. Therefore, output
current is generally set to be such that the motor will not overheat for long time operation.
Phase current rating supplied by motor manufacturer is important to selecting driver
current, but the selection also depends on leads and connection. In principle, If the
temperature
（
<40
℃）
is very low, you can appropriately increase the current setting value
to increase the motor output power as required(Torque and high-speed response).
●
4-lead motor: the output current is set to be equal to or less than the rated current of the
motor.
●
6-lead motor high torque Mode: the motors should also be run at only 50% of their rated
current which is unipolar connection.
●
6-lead motor high speed Mode: the motors should also be run at only 100% of their
rated current which is unipolar connection.
●
8-lead motor Series Connections: the motors should also be run at only 70% of their
rated current which is unipolar connection.
●
8-lead motor
Parallel
Connections: the motors should also be run at only 140% of their
rated current which is unipolar connection.
Note: After the current setting, please run the motor for 15~30 minutes, if the
temperature rise of the motor is too high
（
>70℃
）
, reduce the current setting value.
Therefore, the general situation is to set the current to the value when the motor is
warm for a long time, but it is not too hot.
Ⅶ
. Typical Connection
The FD556S driver with
57HS21
motor which may be connected in series or parallel,
If the motor direction is different from the expected direction, just exchange A+ and A-.
FD542 driver can drive any 2-phase or 4-phase of 4, 6, 8- lead hybrid step motors. The
following diagrams illustrate connection to various kinds of motor leads:
V(Speed)
I
I+
∆I
T(Torque
)
I-
∆I
V-
∆V
T(Torque
)
V(Speed)
V
V+
∆V
Figure 5 T/F Characteristic diagram
4
线电机
8
线电机并行接法
高速性能好
8
线电机串行接法
低速力矩大
6
线电机高力矩模式
6
线电机高速模式
Figure 6 Motor Wiring
A+
A-
B+
B-
A+
A-
B+
B-
A+
A-
B+
B-
A+
A-
B+
B-
A+
A-
B+
B-
