### Objectives

The article shows how to enforce the Electrical Equivalent Circuit (EEC, also called SPEC like Single Phase Equivalent Circuit) parameters of MANATEE software. The electrical equivalent circuit is a circuit made of resistors and inductors representing the **complex transfer function between harmonic voltages and harmonic currents** in the machine. It is used to quickly calculate the supply currents and resulting electromagnetic excitation fields, which are then source of magnetic forces and acoustic noise. MANATEE can calculate analytically or numerically these parameters but **the user can also enforce the DC value of these parameters at a certain temperature**. The modulation of these quantities with temperature and frequency (skin effect factors) are then carried inside MANATEE electrical model.

The equivalent circuit depends on the machine topology. For PMSM MANATEE uses the following circuit:

Description |
Unit | Script syntax |

Stator DC phase resistance | Ohm | Input.Electrical.R10s |

Stator phase inductance along d-axis | Ohm | Input.Electrical.Lmd0 |

Stator phase inductance along q-axis | Ohm | Input.Electrical.Lmq0 |

PM flux linkage | Vs | Input.Electrical.PhiPM0s |

Reference temperature | °C | Input.Electrical.Tsme0 |

For SCIM MANATEE uses the following circuit:

**Basic equivalent circuit of Squirrel Cage Induction Machines (fundamental frequency, with iron loss)**

Description |
Unit | Script syntax |

Stator DC phase resistance | Ohm | Input.Electrical.R10s |

Rotor DC phase resistance | Ohm | Input.Electrical.R20s |

Stator phase leakage inductance | Ohm | Input.Electrical.L10s |

Rotor phase leakage inductance | Ohm | Input.Electrical.L20s |

Magnetizing inductance | H | Input.Electrical.Lm0s |

Reference temperature | °C | Input.Electrical.Tsme0 |

### GUI implementation

To be completed.

### Scripting implementation

To impose the equivalent circuit parameters one must define in the simulation script
`Input.Simu.is_forceSPEC = 1; `

The values from the machine script are then automatically used.