Datum Sim 0.1.2

The motor library: DC, induction and synchronous motors, BLDC and stepper motors, and the pieces of a drive.

Motors

• DC motors: separately excited, shunt, series and compound, each with its field circuit.
• Induction motors: squirrel-cage, double-cage and wound-rotor (rotor voltages as an input, for starting resistors or a rotor-side drive), fed with three-phase voltages.
• Synchronous motors: permanent-magnet with three-phase inputs (surface or interior magnets), synchronous reluctance, and the wound-field salient-pole motor with damper windings used for large medium and high voltage drives.
• BLDC motor with ideal six-step commutation and Hall signals; two-phase hybrid stepper motor.
• Typical ratings: choose a rating in the Inspector (for example 400 V 11 kW, 3.3 kV 500 kW, 11 kV 5 MW) and every value is filled in at once, as one step you can undo. Replace them with nameplate data when you have it.

Drives (a new library group)

• Three-phase source, three-phase inverter (average model, or switched with the switching instants located exactly), PWM, encoder.
• Clarke and Park transforms and their inverses.

Worked examples: induction motor direct-on-line start, induction motor V/f speed control, PMSM field-oriented control with an inverter, BLDC speed control, a 3.3 kV synchronous motor on the grid taking a load step, a DC series motor starting a heavy load, and a stepper motor making full steps.

Checked: the induction motors' torque against the exact equivalent circuit at three slips, the DC motors' and the synchronous motor's steady states, the three-phase PMSM against the d–q PMSM, BLDC no-load speed, the stepper's step angle, the inverter's mean voltages and the encoder. See the verification record.

Fixed

• A zero-crossing that fell exactly on zero at the end of a step could be missed; the variable-step solvers now keep its sign and locate it.