### Abstract

This paper presents an improved completely interconnected procedure for estimating the losses, cooling flows, fluid characteristics and temperature distribution in a gearless mill drive using real life data. The presented model is part of a larger project building a multi-physics model combining electromagnet, thermal and structural interactions. This multi-physics model will later on be used for simulating and parameter optimization of a gearless mill drive. What has been proposed is a multi-physics model where the core losses are determined through a series of static finite element magnetic calculations applied to the principle of separation of losses where the losses of each harmonic are summed up. These losses have then been used in the thermal part of the model as heat generation and is modeled by the finite difference and finite element method. The cooling flow, which properties are updated iteratively according to the heat flux transferred to the fluid, is modeled as a lumped model with two nodes interconnected by 11 channels and one pump. The flow model is based on Bernoulli's energy equation and solved by Newton-Raphson method. All the results from the three physical areas have been verified and have shown to be in good agreement with the found values.

Original language | English |
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Journal | Applied Mathematical Modelling |

Volume | 39 |

Issue number | 7 |

Pages (from-to) | 1941–1965 |

ISSN | 0307-904X |

DOIs | |

Publication status | Published - 2015 |

### Keywords

- Cooling flow
- Electromagnetic losses
- Finite element
- Heat transfer
- Multi-physics
- Ring motor
- Cooling flows
- Electromagnetic loss
- Engineering design
- Large rings
- Mass and heat transfers
- Multi-physics modeling
- Finite element method

## Cite this

Andersen, S. B., Santos, I. F., & Fuerst, A. (2015). Multi-physics modeling of large ring motor for mining industry - Combining electromagnetism, fluid mechanics, mass and heat transfer in engineering design.

*Applied Mathematical Modelling*,*39*(7), 1941–1965. https://doi.org/10.1016/j.apm.2014.10.017