Spindle Cooling Methods
Electric spindles are cooled by three primary methods; Fan, Compressed Air and Chilled Liquid. The more efficient methods allow for higher power ratings, longer duty cycles, smaller packages, and more severe applications. The type of spindle cooling is selected as an option and specific to the spindle model.
Fan cooled spindles are available in two versions: Mechanical and Electric. Of the three methods, fan cooled spindles provide lower efficiency. Mechanical Fan style features a spindle shaft mounted fan that rotates the same speed as the spindle. When the spindle is not rotating no cooling is provided.
The Electric Fan Cooled spindles have a electric fan mounted at the rear of the spindle. They provide constant air flow (CFM) and heat dissipation regardless of the spindle speed; running or stopped (not rotating). The electric fan style provides quieter operation, has a lower cost, and is the most popular cooling method.
Compressed Air Cooled
Compressed Air Cooled spindles are machined from a solid aluminum billet or tube. This housing style provides increased stiffness and vibration dampening. The high degree of cooling is achieved by directing compressed air to dissipate heat from the rotor and stator. Compressed air cooled spindles are designed for applications involving high duty cycles and harsh environments. The amount of air consumption varies by spindle size and design.
Chilled Liquid Cooled
Chilled Liquid Cooled spindles are designed for use with an auxiliary closed loop chiller system. Liquid Cooled spindles are machined from a solid aluminum billet or tube. This housing style provides increased stiffness and vibration dampening. The high degree of cooling is achieved by the flow of chilled liquid to dissipate heat. Liquid cooled spindles deliver higher performance, used in high power applications, high duty cycles and harsh environments.