Rotordynamic Analysis

Calnetix offers complete rotordynamic analysis using in-house-developed, finite-element-based rotordynamic analysis tools for motor generators and magnetic bearing systems (MBS). For motors and generators, this analysis determines critical rotor characteristics for high-speed performance; these characteristics are either passed onto the customer for use in system integration or used internally for modeling of a Calnetix-designed system (including customer specified bearings, rotor components and structural support).

For magnetic bearing systems, this approach allows coupling of the MBS control equations to the rotor and housing structural models for complete system analysis. This rotordynamic analysis allows the overall system design to be optimized for bearing and position sensor location.

MBS analysis includes:

• An undamped critical speed analysis
• A damped unbalance response analysis for the coupled rotor/bearing/support system
• A damped eigenvalue analysis for the coupled system
• A transient nonlinear analysis for emergency rotor drop on the catcher bearings

This analysis provides the basis for the controller compensation algorithm that is used to levitate the system.