Editorial Technical Reference

Stator

This page explains how Stator is classified within Electrical Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

The stationary part of an electric motor that generates a rotating magnetic field.

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Stator in a manufacturing environment
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Product Specifications

Technical details and manufacturing context for Stator

Definition
The stator is the stationary component of an electric motor, specifically in the context of a spindle motor. It is the outer part that remains fixed while the rotor rotates. The stator core is typically made of electrical steel laminations, which are stacked to reduce eddy current losses. Copper wire is wound around the stator core to form the windings, through which electrical current flows. Insulation materials are used to prevent short circuits between the windings and the core. The entire assembly is housed within a structural steel or aluminum frame, which provides mechanical support and aids in heat dissipation.

The primary function of the stator is to generate a rotating magnetic field when alternating current (AC) is applied to the windings. This rotating magnetic field interacts with the magnetic field of the rotor, producing a torque that drives the rotation of the rotor, which is attached to the spindle. The stator is thus the primary electromagnetic component responsible for motor torque generation.

Key parameters for the stator include the outer diameter (OD) and inner diameter (ID) of the stator core, measured in millimeters. These dimensions are critical for fitting the stator within the motor housing and for defining the air gap between the stator and the rotor. The air gap affects the motor's performance, including efficiency and torque characteristics.

When selecting or verifying a stator for a specific application, it is essential to confirm the exact dimensions, winding configuration, and material specifications with the legal manufacturer or supplier. The values provided in this directory are reference ranges and must be validated for the actual model or application. No standards are currently listed for this product; however, any applicable standards should be verified with the manufacturer or supplier to ensure compliance.
Working Principle
When alternating current (AC) is applied to the stator windings, it creates a rotating magnetic field. This field interacts with the magnetic field of the rotor, inducing a force (Lorentz force) that causes the rotor, and consequently the motor spindle, to rotate. The stator's stationary nature ensures that the magnetic field rotates, driving the rotor's motion.
Common Materials
Electrical steel laminations, Copper wire (windings), Insulation materials, Structural steel or aluminum (housing/frame)
Technical Parameters

What to specify in your RFQ

  • Outer diameter (OD) and inner diameter (ID) of the stator core, critical for fitting within the motor housing and defining the air gap with the rotor. in mm

These are the quantities to specify to the manufacturer when sizing or requesting a quote. The manufacturer's own documentation governs the exact figures and applicable standard.

Components / BOM
  • Stator Core Part
    Provides a low-reluctance path for the magnetic flux. Made of laminated electrical steel to reduce eddy current losses.
    Material: Electrical steel laminations
  • Stator Windings Part
    Coils of insulated copper wire placed in the slots of the stator core. When energized, they create the electromagnetic field.
    Material: Copper wire, insulation
  • Stator Frame/Housing Part
    The mechanical structure that holds the stator core and windings, provides mounting points, and often acts as a heat sink.
    Material: Cast iron, aluminum, or structural steel
  • Insulation System
    Electrical insulation between windings and between windings and the stator core to prevent short circuits.
    Material: Polymer films, varnishes, slot liners

Application & selection

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric (enclosure-dependent)
other spec: Max voltage: 15kV typical, Frequency: 50/60Hz standard
temperature: -40°C to 180°C (Class H insulation typical)
Media Compatibility
✓ Clean dry air ✓ Inert gas atmospheres ✓ Non-conductive cooling fluids
Unsuitable: Abrasive particulate-laden environments
Sizing Data Required
  • Motor power rating (kW/HP)
  • Operating voltage and frequency
  • Required torque/speed characteristics

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Insulation breakdown
Cause: Thermal degradation from overheating, contamination by moisture/oil, or electrical stress from voltage spikes
Winding short circuit
Cause: Mechanical vibration leading to abrasion, loose connections causing arcing, or manufacturing defects in winding insulation
Maintenance Indicators
  • Excessive vibration or audible humming indicating loose windings or bearing issues
  • Burning smell, smoke, or visible discoloration/charring on stator windings
Engineering Tips
  • Implement regular infrared thermography scans to detect hot spots and prevent thermal degradation before failure occurs
  • Maintain proper alignment and balance of connected rotating equipment to minimize mechanical stress on stator windings

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 1940-1:2003 (Balance quality requirements for rotors in a constant rigid state) IEC 60034-1:2022 (Rotating electrical machines - Part 1: Rating and performance) DIN 42950:1988 (Dimensions of electrical machinery - Frame sizes 56 to 400 and flange sizes 65 to 740)

Quoted from the published standard.

Manufacturing Precision
  • Bore diameter: +/-0.02 mm
  • Stack length: +/-0.1 mm
Quality Inspection
  • High-potential (hipot) test for insulation integrity
  • Dimensional verification using coordinate measuring machine (CMM)
Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

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Manufacturers of Stator

Manufacturer profiles associated with Stator.

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Frequently Asked Questions

What is the primary function of a stator in a spindle motor?

The stator generates a rotating magnetic field when AC current flows through its windings. This field interacts with the rotor to produce torque, causing the rotor and spindle to rotate.

What materials are typically used in a stator?

Common materials include electrical steel laminations for the core, copper wire for windings, insulation materials, and structural steel or aluminum for the housing or frame.

Why are the outer and inner diameters of the stator core important?

The outer diameter (OD) and inner diameter (ID) are critical for fitting the stator within the motor housing and for defining the air gap with the rotor, which affects motor performance.

How should I verify the specifications of a stator for my application?

You must confirm the exact dimensions, winding configuration, and material specifications with the legal manufacturer or supplier. The values in this directory are reference ranges and must be validated for your specific model.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Related equipment

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Spindle Motor
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Motor
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Motor/Solenoid
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Servo Actuator / Linear Motor
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Drive Motor (Servo/Stepper)
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Motor Assembly
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Feed Motor
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High-Vacuum Pump
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Stepper Motor
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Servo/Stepper Motor
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Industrial Ecosystem & Supply Chain Structure

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 12 October 2026

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