Category: Toolbox > eDrives > eMotors (Legacy) > Motors
Inputs:
•stator q input & stator d input: Direct-quadrature (DQ) voltages
•Load Reaction Torque Vector: Load reaction torque vector if external mechanical load is used
Description: The AC Induction Motor DQ block is derived from the system of nonlinear differential equations describing electromechanical motion of a three-phase AC induction motor written in the arbitrary reference frame and reduced to the stationary frame by setting the frame angular velocity equal to 0.
Mechanical dynamics include typical parameters, such as rotor shaft inertia and viscous friction. In addition, nonlinear dissipative factors, including Coulomb friction and stiction models are provided. The block can operate stand-alone to produce output displacement or velocity of the motor alone, or when a Rotational Load block is connected, combined dynamic response. When connected to the Rotational Load block, dynamic parameters are reflected back and combined with the motor dynamics by the linkage ratio. The linkage ratio is specified in the Rotational Load block. This creates proper dynamic motion of the combined motor-load connection. To connect the AC Induction Motor DQ block to the Rotational Load block, the motor displacement and load reaction vector connections from each block must be wired together.
Rotor shaft position, velocity, and stator DQ phase currents are provided for sensor connections in monitoring and feedback applications.
Number of Motor Poles: Indicates the number of motor pole pairs.
Rotor Leakage Inductance: Indicates the specified rotor leakage inductance.
Rotor Moment of Inertia: Indicates the moment of inertia of the rotor with respect to the axis of rotation.
Rotor Resistance: Indicates the rotor winding resistance.
Rotor Shaft Coulomb Friction Magnitude: Allows specification of constant directional dissipative force (Coulomb model).
Rotor Shaft Stiction Factor: Allows specification of a stiction force value or break-away torque. This parameter is normally not specified by the motor manufacturer, but can be obtained experimentally.
Rotor Shaft Viscous Damping Factor: Indicates the factor that linearly relates viscous damping force to angular velocity. This parameter is normally not specified by the motor manufacturer, but can be determined experimentally.
Stator Inductance (per phase): Indicates the stator per phase coil inductance .
Stator Leakage Inductance: Indicates the specified stator leakage inductance.
Stator Resistance (per phase): Indicates the stator per phase coil resistance.
Diagram name: ACIM DQ Model
Location: Examples > eMotors (Legacy) > AC Induction
A DQ frame voltage source is created using a three-phase source, and Clarke and Park’s transforms (see example under Park Transform). Rotor displacement is connected to the Rotational Load block. Reaction torques are fed back to the motor model. DQ transient currents are observed by plotting signals from the output wires provided on the motor model.
