Rotor/Stator Assembly for Electric Motors | Specifications & Standards

Product Specifications

Technical details and manufacturing context for Rotor/Stator Assembly (Motor)

Definition

The rotor/stator assembly is a critical sub-assembly of an electric motor, comprising the rotor (the rotating part) and the stator (the stationary part). Together, these components convert electrical energy into mechanical motion through electromagnetic interaction. This assembly is the primary working component within an actuator (motor/solenoid) and is responsible for generating torque and rotational force. The rotor typically consists of a laminated core made of electrical steel, with either permanent magnets (e.g., neodymium) or a squirrel-cage arrangement using aluminum conductors. The stator comprises a laminated core with copper windings that produce a rotating magnetic field when energized. The interaction between the stator's magnetic field and the rotor's magnetic field or induced currents produces torque, causing the rotor to turn. This assembly is available in a range of configurations to suit various industrial applications, with rated power from 0.75 to 250 kW, rated voltage from 220 to 690 V AC, and frequencies of 50 or 60 Hz. The number of poles can range from 2 to 12, affecting synchronous speed. Insulation class is typically F or H, and efficiency class ranges from IE2 to IE4 per IEC standards. Rotor diameter ranges from 50 to 500 mm, stator outer diameter from 100 to 800 mm, and air gap from 0.2 to 2.0 mm. Concentricity tolerance is ≤0.05 mm, and balance grade is G2.5 to G6.3. Operating temperature range is -20 to 80 °C, and IP rating is IP54 to IP65. Total assembly weight ranges from 5 to 500 kg. These values are reference ranges; verify model-specific parameters with the manufacturer.

Working Principle

When electrical current is applied to the stator windings, it creates a rotating magnetic field. This field induces currents in the rotor (or interacts with permanent magnets on the rotor), producing a torque that causes the rotor to turn, thereby converting electrical energy into mechanical rotation.

Common Materials

Electrical Steel (Silicon Steel), Copper Windings, Permanent Magnets (e.g., Neodymium), Aluminum (for rotor cage)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Power	0.75–250 kW	Power range for typical industrial motorsIEC 60034-1
Rated Voltage	220–690 V AC	Standard low-voltage motor ratingsIEC 60034-1
Frequency	50/60 Hz	Standard power grid frequenciesIEC 60034-1
Number of Poles	2–12 poles	Determines synchronous speed
Insulation Class	F–H class	Thermal endurance of insulationIEC 60085
Efficiency Class	IE2–IE4 class	Energy efficiency per IEC standardsIEC 60034-30-1
Rotor Diameter	50–500 mm	Outer diameter of rotor lamination stack
Stator Outer Diameter	100–800 mm	Outer diameter of stator core
Air Gap	0.2–2.0 mm	Radial gap between rotor and stator
Concentricity	≤0.05 mm	Tolerance for rotor-stator alignmentISO 1101
Balance Grade	G2.5–G6.3 grade	Rotor balance quality per ISOISO 21940-11
Operating Temperature	-20–80 °C	Ambient temperature range for operation
IP Rating	IP54–IP65 class	Protection against dust and waterIEC 60529
Weight	5–500 kg	Total assembly weight

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Stator Core Part
Provides the stationary magnetic field through wound coils or permanent magnets.

Material: Electrical Steel Laminations
Rotor Core Part
The rotating part that interacts with the stator's magnetic field to produce torque.

Material: Electrical Steel Laminations or Permanent Magnets
Shaft Part
Transmits the mechanical torque from the rotor to the external load.

Material: Steel Alloy (e.g., 4140)
Bearings
Support the rotor shaft, allowing smooth rotation with minimal friction.

Material: Steel (with ceramic or steel balls)
Windings (Coils) Part
Conductors wound around the stator (and sometimes rotor) to create electromagnetic fields when energized.

Material: Copper or Aluminum

Applied To / Applications

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

Actuator (Motor/Solenoid)

View system integration details

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Frequently Asked Questions

What is the function of the rotor/stator assembly in an electric motor?

The rotor/stator assembly is the core electromagnetic part of an electric motor. It converts electrical energy into mechanical rotation by generating torque through the interaction of magnetic fields.

What materials are commonly used in this assembly?

Typical materials include electrical steel (silicon steel) for laminations, copper for windings, permanent magnets (e.g., neodymium) for the rotor, and aluminum for the rotor cage in induction motors.

What are the typical power and voltage ranges?

For industrial motors, rated power ranges from 0.75 to 250 kW, and rated voltage from 220 to 690 V AC, per IEC 60034-1. Frequency is typically 50 or 60 Hz.

How do I verify the quality and compliance of this assembly?

Check the balance grade (ISO 21940-11), concentricity (ISO 1101), insulation class (IEC 60085), efficiency class (IEC 60034-30-1), and IP rating (IEC 60529). Always confirm model-specific values with the manufacturer.

Data Basis

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pressure:	Ambient atmospheric pressure (sealed motor) or up to 10 bar for pressurized housings
other spec:	Max rotational speed: 20,000 RPM (dependent on bearing type and balance grade), Vibration limit: ≤2.8 mm/s RMS, IP rating: IP54 to IP69K (enclosure dependent)
temperature:	-40°C to +180°C (Class H insulation)

Rotor/Stator Assembly (Motor)

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