5 Spindle Axis Operation
5.6.1 Characteristics of a Winding Selection Wide-range Constant-output Servo Drive for a Spindle Axis
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5.6
Winding Selection
This section describes the methods that are used to perform winding selection from the SERVOPACK.
5.6.1
Characteristics of a Winding Selection Wide-range Constant-output Servo
Drive for a Spindle Axis
Winding selection for an AC spindle motor is an effective way to extend the constant-output control range of
the servo driver that drives the spindle axis.
The characteristics of this type of servo driver are described below.
• Wide Constant-output Control Range
The servo driver for the spindle axis can achieve a constant-output range of 1:12 without the use of a gearbox.
• Small Drive Capacity
If the constant-output range of the servo driver for a spindle axis is expanded, the motor current in the low-
speed area is forced to increase, and therefore the capacity of the servo driver must also be increased.
If winding selection is used, you can simply change the motor winding connection to obtain a constant-output
control of 1:12 with a standard servo driver capacity.
• Good Control Stability
Winding selection separates the constant-output control range between low-speed winding and high-speed
winding for optimal control.
Therefore, the loop gain can also be increased for more stable control.
• Magnetic Contactor for Winding Selection
This is a compact magnetic contactor developed specifically for winding selection.
A transfer contact configuration enables a mechanical lifetime of over 5,000,000 uses and direct drive from
the host controller.