Squirrel Cage Induction Motor

Simplicity, Low Cost, Adaptability

• Horizontal and Vertical
• Solid and Hollow Shaft
• 100 - 20,000 hp, Up to 16,000 Volts

The squirrel cage induction motor is the one most widely used for driving pumps, fans and compressors. Its advantages include an inherent simplicity in both motor construction and control, lower initial cost particularly in the smaller ratings, and adaptability to the worst of environments. Squirrel cage motors are available with either standard or premium efficiency. Special designs and features are available for variable frequency supply applications.

Squirrel Cage Rotor

• Lower Rotor Inertia
• Greater Stall Time
• Strong Bar to End-Ring Joints
• Reduced Windage Noise
• Optimum Torque vs. Slip Design

The squirrel cage induction motor is basically a rugged yet simple arrangement of shaft, magnetic circuit and electric winding. The magnetic circuit consists of discs punched from electrical grade thin sheet steel assembled to form a laminated magnetic core mounted on the shaft. The laminations are coated with a thermally stable insulating film to reduce magnetic losses and yet maintain dimensional stability in the face of the severe thermal and mechanical stresses of starting as well as normal operation. The rotor winding consists of a number of uninsulated metal bars in the outer surface of the magnetic core parallel to the shaft and short circuited by metal rings at both ends. Fabricated aluminum or copper rotor construction is available for Custom 8000® and PegasusTM MHV motors.

Vibration Equipment

Seismic-type such as RobertshawTM measures overall vibration. 1-6 units are located on the frame.
Proximity-type such as Bentley NevadaTM measures the shaft vibration. 2-5 units are located on the bearing housing.
Acceleration-type such as MetrixTM measures bearing housing vibration. 1-6 units are located on the bearing housing.

Other Accessories

Whenever required, the following accessories may be supplied:

• Surge protection
• Tachometers (capacitors and lightning arresters) •
• Overspeed switches
• Current transformers
• Slide rails
• Pressure switch
• Sole-plates
• Space Heate