Motor Air Gap Tolerance Analysis Report

1. Model Overview

Objective:
The air gap is a critical performance‑sensitive dimension in motor design. This study analyzes its distribution under current tolerances and manufacturing processes.

Key Question:
What is the statistical distribution of the motor air gap under given manufacturing constraints?

Assembly Process Scheme

Part Dimensions

Model Creation

Assembly Setup

Step 1: Stator‑to‑Frame Installation

•Method: Single‑hole, single‑pin 

•Note: The stator OD and frame ID are typically interference‑fit. Setting the pin‑hole floating mode to “no float” simulates this interference condition.

Step 2: Rear End Cover Installation

•Method: 3‑2‑1 Locating 

•Note: Locating is achieved by the radial stop (primary plane), axial stop pin (primary pin), and one fastening hole (secondary pin).

Step 3: Front Cover Installation

•Method: 3‑2‑1 Locating 

•Note: The radial stop (primary plane), axial stop pin (primary pin), and one fastening hole (secondary pin) define the positioning of the front cover relative to the frame.

Step 4: Rotor Assembly Installation

•Method: Three‑point locating 

•Note: The rotor shaft is aligned coaxially with the bearing centers of the front and rear end covers using a three‑point locating scheme. Once assembled, rotational freedom is released to allow shaft rotation.

Assembly Measurement

Target: Radial air gap between rotor and stator
Method: Two‑point radial measurement

Procedure:
Using the shaft center as the reference, measure along a radial line through the center. The larger value between the stator inner diameter and rotor outer diameter on that line is recorded as the clearance.

Tolerance Simulation Model

Simulation Calculation

Simulation Calculation Result Analysis