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MDS-D/DH Series Specifications Manual
3-1 Base control functions
3-1-5 Spindle's continuous position loop control
Under this control, position loop control is always applied to spindle, including when speed command is
issued (in cutting). There is no need for control changeover nor zero point return during orientation and C
axis control changeover. Therefore, the operation can be completed in a shorter time than the previous.
In acceleration/deceleration with S command, the acceleration/deceleration and orientation are always
controlled with the spindle motor's maximum torque.
3-1-6 Coil changeover control
A signal output from the spindle drive unit controls the changeover of the low-speed and high-speed
specification coils in a spindle motor.
The drive unit automatically outputs the coil changeover sequence in accordance with the motor speed.
3-1-7 Gear changeover control
This function enables a spindle motor to perform both high-speed light cutting and low-speed heavy cutting
by changing the gear ratio between the motor and spindle.
The gear change is carried out while the spindle is not running.
3-1-8 Orientation control
This control enables a spindle motor to stop at a designated angle when the motor is rotating at a high-speed
with a speed command. This control is used for exchanging the tools in machining centers and performing
index positioning in lathes, etc.
3-1-9 Indexing control
This control enables positioning of a spindle motor at an arbitrary angle (in increments of 0.01 degrees) from
the orientation stop position. This control is used for positioning in lathes for hole drilling, etc.
3-1-10 Synchronous tapping control
Under synchronous tapping control, spindle control is completely synchronized with Z axis servo control, and
Z axis is accurately fed by one screw pitch in accordance with one tap revolution. The tap is completely fixed
to the spindle head. As a result, feed pitch error is less likely to occur, which allows high-speed, high-
accuracy and high-durable tapping.
10.8
Zero point
return
C-axis
positioning
<Our conventional series>
<MDS-D/DH/DM Series>
C-axis
positioning
Time reduced
Time
Time
TimeTime
SpeedSpeed
SpeedSpeed
Reduced by 20%
Orientation
C-axis changeover
<Our conventional series>
<MDS-D/DH/DM Series>