Basic Servomotor Description

The 1326AB Servomotors are a family of high performance, three-phase,

brushless AC synchronous motors designed by Allen-Bradley to meet the

stringent requirements of servo system applications. This series of standard

AC servomotors can be used with 1391 AC Servo Controllers. The perfor

mance parameters of these motors with selected amplifiers are listed on

page 8. The typical speed-torque curves (see page 9) depict the opera

tional envelope of these motor and controller combinations.

Each motor has the following standard features:

• Permanent magnet rotor for increased servo response.

• Three-phase sinusoidal wound stator field for direct transfer of heat to

ambient, and smooth operation at low speeds.

• Brushless resolver supplies position, commutation & velocity feedback

information. This also provides durability in harsh environments by not

having on-board electronics in the motor. 1391 A Quad B (optional)

encoder output (up to 2048 ppr) is generated via resolver feedback.

• 100% continuous rated output torque at stall (zero rpm).

• Precision balance of 0.0005” (0.0127 mm) total peak-peak displacement.

• Vertical shaft up or down mounting.

• TENV construction.

• IP65 rated (when used with the Shaft Seal option) to withstand harsh environments.