In the context of electrical machines, a system of coils having different phase offsets is commonly referred to as a winding. The Multiphase Winding feature simplifies the excitation of a system of coils having multiple phase angles. It is available in The Rotating Machinery, Magnetic Interface (RMM), and The Magnetic Machinery, Rotating, Time Periodic Interface (MMTP). For the RMM interface, it is possible to add a Loss Calculation subfeature in order to compute induced losses, whereas for MMTP this is built into the main Multiphase Winding feature.

Enter a Winding name. This name is appended to the variables defined by this winding.

Select the Excitation type to be used. With Phase currents the peak value of phase currents applied to all phases is specified directly as an input. With DQ currents the excitation is specified in terms of direct and quadrature current components. The combination of Park and Clarke transformations (Ref. 1) simplifies winding excitation with respect to the direct and quadrature axis of a rotating magnetic field.

This field is only available when Phase currents is chosen as the Excitation type. Enter the Peak phase current, which is the peak value of the current applied to all phases.

This field is only available when Phase currents is chosen as the Excitation type. Enter the Initial electrical angle, which is an angular offset applied to all phases of the system. Typically, the excitation in a multiphase system needs to be adjusted in order to be in a particular angular position relative to other components of the overall system.

This field is only available when DQ currents is chosen as the Excitation type. Enter the D-axis current which is the component of the winding current producing a magnetic field along the direct axis.

This field is only available when DQ currents is chosen as the Excitation type. Enter the Q-axis current which is the component of the winding current producing a magnetic field along the quadrature axis.

This field is only available when DQ currents is chosen as the Excitation type. Enter the Initial D-axis angle which aligns the reference frame for the direct-quadrature transformations with the direct axis of the rotor magnetic field. The angle is specified as the winding electrical angle at which the concatenated flux of the reference phase (phase offset angle 0°) reaches its peak value.

Enter the Frequency for time-dependent studies, which is the electrical frequency of excitation that defines the speed of a moving or rotating magnetic field.

This field is only available when DQ currents is chosen as the Excitation type. Select the Reference frame definition to be used in the direct-quadrature transformation. Synchronous, being the default, defines the reference frame as rotating at the same speed as the electrical excitation. For a synchronous machine this means the winding direct-quadrature variables are referred to a reference frame fixed with the rotor. Stationary defines the reference frame to be non-rotating in which the direct-quadrature variables are effectively the result of a pure Clarke transformation or equivalent to alpha-beta components. User defined allows for arbitrary definition of the Reference frame angle. This angle can be a function of time, making it possible to define any angular velocity for the reference frame definition which is also known as arbitrary reference frame (Ref. 2). For The Magnetic Machinery, Rotating, Time Periodic Interface the only available Reference frame definition is Synchronous.

Select the Winding layout configuration to be used. The layout of a winding is the pattern in which the coils are arranged with regard to phase and geometrical position. The different options supported by the Multiphase Winding feature are User defined and Automatic three phase. When User defined is selected, multiple Phase subfeatures can be added, in which domains representing coils of each phase can be selected. Select Automatic three phase to instead configure the domains of all phases under the assumption that the winding is a balanced three phase system where all coils are of equal shape and number of turns, and that all coil positions or slots are fully utilized.

This field is only available when Automatic three phase is chosen as the Winding layout configuration. Specify the Number of poles of the magnetic field to be excited by the winding.

This field is only available when Automatic three phase is chosen as the Winding layout configuration. Specify the Number of slots available for all coils of the winding.

This field is only available when Automatic three phase is chosen as the Winding layout configuration. Specify the Number of coils per slot, which is how many coils each slot can accommodate. The automatic winding layout supports either one or two coils per slot.

This button is only available when Automatic three phase is chosen as the Winding layout configuration. When this button is clicked, a check will first be made to see if the number of poles, slots, and coils per slot are valid under the assumptions described for the Automatic three phase setting. If this check passes, three Phase subfeatures will be added under the Multiphase Winding node, with selections of coil domains and corresponding phase angles automatically configured.

This section is only available when Automatic three phase is chosen as the Winding layout configuration. This setting allows for custom configuration of sector periodicity in models where only a part of the full geometry is included. The two different options in this section are Automatic and User defined. If Automatic is chosen, the settings will automatically match those in any Continuity or Sector Symmetry feature that is present in the model. When User defined is chosen, the options become identical to those in the Sector Symmetry feature.

This section is identical to the corresponding section in the Coil feature.