Rockwell Automation 8510 AC Spindle Drive System User Manual - Manual (Page 7)

Introduction
Chapter 1
1-3
1327A AC Motor Overview The 1327A AC Spindle Motors have been specifically designed to meet the
needs of modern machine tools. To cover the variety of application
requirements, both a standard series and a dual winding series are
available. Some of the key features of these motors include:
n Small Size – Advanced electromagnetic and cooling system designs
provide extremely compact motors.
n High Speeds – In the standard series, 8,000 rpm maximum speed is
available up to 5.5 kW (7.5 HP) and 6,000 rpm through 22 kW (30 HP)
continuous output. All motors are 1,500 rpm base speed.
n Precision Balance – For high precision machine tools, precision balance
to less than 3 micron (0.00012”) peak to peak vibration is standard.
n Wide Constant Power Range – With the dual winding motors, 12:1
constant power ranges can be obtained. Constant power speed ranges of
500 to 6,000 rpm or 400 to 4,800 rpm can frequently eliminate the need
for multi-speed spindle headstocks.
n High Reliability – The resolver feedback eliminates all electronics from
the high temperature motor environment to significantly increase motor
ruggedness and reliability. This is combined with bearings designed for
a 15,000 hour B10 life, a high voltage insulation system tested to 1,500
volts, and the precision rotor balance to assure a superior motor life.
n Mounting Versatility – Metric foot mount and flange mount motors are
available for either horizontal or vertical mounting.
Drive Design Features The following design features are standard on the Series 8510 AC Spindle
Drive System.
Multiple Control Modes
To provide the flexibility and control capability to meet the demands of
increasingly sophisticated machine tools and other types of automation
equipment, the 8510 provides multiple operating modes. Through discrete
inputs, the user can instantaneously switch the 8510 drive between Spindle
Mode, Servo Mode, and Torque Mode operation. Each mode has a unique
set of programmable drive configuration, input scaling, and control loop
tuning parameters to allow optimized performance in each operating mode.
Spindle Mode – provides smooth, quiet operation over the wide constant
power range required for normal machining. In typical machine tool
spindle applications, this is the only operating mode that is required. The
drive can operate from analog or digital speed commands with
programmable acceleration ramp rate generators and provides a traditional
PI type velocity control loop. During lightly loaded operation, the motor
flux is reduced to minimize motor heating.
Spindle mode assumes that the drive is operating as an open loop speed
controlled drive without an external position control loop closed around the
drive.