Coil Changeover Control - Mitsubishi Electric MDS-D-SPJ3 Specification Manual

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.
3-1-11 Spindle synchronous control
This control enables two spindles to run at the same speed. A spindle being driven with a speed command is
synchronized with another spindle at a constant rate or acceleration/deceleration rate.
This control is applied such as when a workpiece is transferred between two rotating chucks in lathe or a
workpiece is held with two chucks.
3-1-12 Spindle/C axis control
An axis rotating about Z axis is called C axis, whose rotation direction is normally the same as of spindle.
This function enables high-accuracy spindle control including interpolation control, like servo axis, when a
high-resolution position detector is attached to the spindle motor.
3-1-13 Proximity switch orientation control
Orientation control is carried out based on the leading edge position of the proximity switch output signal
(ON/OFF).
MDS-D-SVJ3/SPJ3 Series Specifications Manual
3-1 Base functions
3 - 7