# Low-Order Radial Modal Test and Analysis of Drive Motor Stator

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## Abstract

**:**

## 1. Introduction

## 2. Test Objects and Tools

#### 2.1. Motor Stator

#### 2.2. Modal Test System

## 3. Test 1: Effect of Stator Shell on the Stator Modal

#### 3.1. Sensor Layout and Parameter Setting

#### 3.2. Results and Analysis

## 4. Test 2: Stator Modal Analysis under Different Excitation Sources

#### 4.1. Sensor Layout and Parameter Setting

#### 4.2. Results and Analysis

## 5. Conclusions

- (1)
- The coherence function of motor stator without shell is higher than that with shell, which indicates that the experimental modal of motor stator without shell is easier to be excited. The frequency response curve of motor stator with shell is lower than that without shell. The modal frequencies excited with shell are significantly higher than those without shell.
- (2)
- Under different output currents and voltages, the same excitation response point obtained by frequency sweeping method has the same frequency response function. The motor stator presents a linear structure in the frequency domain concerned. The frequency response functions of the motor stator obtained by the hammering method and frequency sweeping method have good consistency in the low frequency band. The consistency of the radial and axial frequency response functions is better than that of the tangential frequency response functions.
- (3)
- The (1, 1), (1, 2) and (1, 3) modals of the motor stator with shell can not be excited by the hammering method. The modal frequencies obtained by the frequency sweeping method are slightly higher than those obtained by the hammering method. The motor stator without shell has multiple root modals. As the number of radial nodes is the same, a larger number of axial nodes results in a higher modal frequency.
- (4)
- The natural frequency and vibration mode of the motor stator are not determined by the stator alone. The stator shell also plays an important role. The NVH performance of the stator cannot be used for evaluating the NVH performance of the stator system, as the impact of the stator shell on the stator system NVH should also be considered.

## Author Contributions

## Funding

## Institutional Review Board Statement

## Informed Consent Statement

## Conflicts of Interest

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Order | Hammering Method (with Shell) | Hammering Method (without Shell) | Frequency Sweeping Method (without Shell) | |||
---|---|---|---|---|---|---|

Frequency (Hz) | Damping Ratio | Frequency (Hz) | Damping Ratio | Frequency (Hz) | Damping Ratio | |

(0, 0) | 3285 | 2.16% | 3073 | 1.04% | 3087 | 0.81% |

(0, 1) | 4707 | 2.13% | 2176 | 1.38% | 2189 | 2.14% |

(1, 1) | - | - | 2665 | 2.13% | 2681 | 1.41% |

(0, 2) | 388 | 2.27% | 156 | 1.25% | 159 | 1.58% |

(1, 2) | - | - | 370 | 2.68% | 381 | 2.21% |

(0, 3) | 790 | 4.52% | 432 | 1.50% | 438 | 2.05% |

(1, 3) | - | - | 938 | 2.76% | 957 | 3.21% |

(0, 4) | 1311 | 4.99% | 798 | 1.93% | 815 | 2.40% |

(0, 5) | 1972 | 2.99% | 1244 | 0.88% | 1263 | 2.68% |

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**MDPI and ACS Style**

Li, J.; Yang, S.; Yang, J.; Li, F.; Zeng, Q.; Shao, J.; Chang, C.; Wu, N.; Chen, Y.; Li, K.
Low-Order Radial Modal Test and Analysis of Drive Motor Stator. *Machines* **2021**, *9*, 97.
https://doi.org/10.3390/machines9050097

**AMA Style**

Li J, Yang S, Yang J, Li F, Zeng Q, Shao J, Chang C, Wu N, Chen Y, Li K.
Low-Order Radial Modal Test and Analysis of Drive Motor Stator. *Machines*. 2021; 9(5):97.
https://doi.org/10.3390/machines9050097

**Chicago/Turabian Style**

Li, Jie, Shaobo Yang, Jincai Yang, Fengqin Li, Qingqiang Zeng, Junlong Shao, Chun Chang, Nian Wu, Ying Chen, and Keqiang Li.
2021. "Low-Order Radial Modal Test and Analysis of Drive Motor Stator" *Machines* 9, no. 5: 97.
https://doi.org/10.3390/machines9050097