PAM Motors are AC induction machines with two predetermined speeds. Pole Amplitude Modulation offers many benefits to industrial users.

• The speeds of a PAM Motor are changed electrically, rather than mechanically. This reduces HP input to the fan, thereby eliminating the need for speed-adjusting coupling devices, which are prone to slip energy loss.
• A PAM Motor is a practical and effective means of driving a load where a change of speed can provide operating economies.
• First costs are lower than that for a comparable two-speed, two-winding motor.
• As a single-winding machine, the PAM Motor is lighter, smaller and more efficient than a two-winding motor for comparable rating and application.
• Rotor heating can be reduced up to 40 percent when starting high-inertia loads by initially using the lower speed connection.
• The PAM Motor saves energy costs because speeds can be changed as operating conditions dictate changes in rates of flow.
  

After considering all the factors, including cost, space, power savings, and reliability, PAM Motors are an optimum choice for two-speed motor operation.