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Rotating Machinery Tab

Rotating machinery conditions for the magnetic transient analysis are set on this tab.

It is in the [Analysis Condition Setting] dialog box. See also [How to Set Analysis Condition].

Setting Item	Notes
Rotational Movement	Constant Velocity Selectable it if the number of rotations is constant. Number of Rotations Sets the number of rotations [r/min]. If 0 is entered, the rotation is locked. Select [Rotor] on the "Stator/Rotor/Air" tab for the body attribute to create the rotor body. The rotational direction is on the modeling window. Enter negative value for the reverse rotation. The number of rotations of synchronous machine is expressed as follows. Ns=120*f/P Ns: Number of rotations (synchronized velocity) f: Frequency [Hz] of AC power P: Number of poles Rotor's Initial Rotation Position Sets the rotor's initial rotation position [deg] at the initial time. The value has to be the multiple of the [Circumferential Division Angle]. Motion Equation Coupling Executes the magnetic-rotational movement coupled analysis where the rotational movement is defined by the motion equation. Click this button. The [Setting Motion Equation Coupling] dialog box will appear. See also [Setting Motion Equation Coupling] for the details. Lock step method is used for the simulation if the velocity is constant. Moving band method is used for the motion equation coupled analysis. Lock step method: divides the slide face equally and moves at the integer multiple of the circumferential division angle. Moving band method: Augmented lock step method where the movement at the non-integer multiple of circumferential division angle is possible. It enables smooth rotational movement at specified angle.
Location of Rotation Axis (Any point on the axis)	Defines the location of the rotation axis. Enter any given coordinates of the rotation axis. The direction of the rotation axis cannot be changed.
Gap Type	Sets either radial gap or axial gap for the rotating machinery. Axial gap is available only for 3D analysis. It affects the sliding mesh position.
Number of Sliding Mesh Divisions	Sets the number of sliding mesh divisions. Sliding Mesh: To analyze the rotating machinery, only rotor's meshes are set to move. The sliding meshes are generated in the gap of rotor and stator to match the sliding meshes when the rotor rotates. The meshes are rectangular in the 2D analysis and triangular prism in the 3D analysis. Circumferential Division Angle Specifies the circumferential division angle [deg] of the rotating machinery. (A in above diagram) If the rotational movement is [Constant Velocity], it is the minimum rotation angle per timestep. That is not always the case if the rotational movement is [Motion Equation Coupled]. If the rotation angle is not the multiple of the circumferential division angle, calculation is performed by transforming the sliding meshes to parallelogram. Rotational Quantity per Step If the rotational movement is [Constant Velocity], set the rotational quantity per step that is set on the [Transient Analysis tab]. The unit is [Mesh]. If the value is 1, the rotor rotates at the angle set in the [Circumferential Division Angle] in a step. If the value is n, the rotation movement is at the multiple of n. No setting is required if the [Motion Equation Coupling] is selected for the rotational movement. Number of sliding mesh layers Specifies the number of sliding mesh layers. (B in above diagram)
Location of Sliding Mesh	Sets the location of sliding mesh (for gap of rotor and stator). Automatic Calculation Calculates the sliding mesh location automatically. Generally this option is selected. Deselect it only when the automatic calculation does not work. Set the parameters manually as follows. Automatic calculation is based on the setting of [Stator/Rotor/Air] of the body attribute. Rotor Type Sets either inner rotor or outer rotor. Gap Radius Sets the inner and outer diameters of the gap between rotor and stator by radius. Gap's Coordinates in Axial Direction (Z Coordinate) For the axial gap, specify the Z coordinates of the upper and lower faces of the gap in the rotation axis direction. Enter the values in the decreasing order.