Rotor with Eccentric Weight

Product Specifications

Technical details and manufacturing context for Rotor with Eccentric Weight

Definition

The rotor with eccentric weight is the core moving part within a vibration motor. It consists of a shaft-mounted rotor with a deliberately unbalanced mass distribution. When rotated by the motor's electromagnetic field, the off-center weight creates a centrifugal force that causes the entire motor assembly to vibrate. This component directly converts rotational motion into vibrational energy. The rotor is typically made of electrical steel laminations, while the eccentric weight is often a high-density tungsten alloy. The eccentricity, unbalance mass, and rated speed determine the centrifugal force and thus the vibration amplitude. Typical rated speeds range from 3000 to 6000 rpm, with a maximum speed of 8000 rpm. Eccentricity ranges from 5 to 20 mm, and unbalance mass from 0.5 to 5 kg. The resulting centrifugal force at rated speed is between 500 and 5000 N. The rotor is balanced to ISO 1940-1 grades G6.3 to G2.5. The shaft material is typically carbon or alloy steel (e.g., 45# or 40Cr) per GB/T 699 and GB/T 3077, with surface hardness of HRC 40–50 and a zinc-nickel plating for corrosion protection. The operating temperature range is -20 to 80 °C. The rotor diameter ranges from 50 to 200 mm, length from 100 to 500 mm, and weight from 2 to 20 kg. These values are typical ranges; actual specifications must be confirmed with the manufacturer for the specific model. The rotor is used in vibration motors for applications such as material handling, screening, and compacting. It is essential to verify the balancing grade and other parameters against the intended application to ensure reliable operation.

Working Principle

The rotor is mounted on the motor shaft. When electrical power is applied, the motor's stator creates a rotating magnetic field that drives the rotor. Due to the eccentric (off-center) mass attached to or integrated into the rotor, the center of mass does not align with the axis of rotation. As the rotor spins, this imbalance generates a centrifugal force that changes direction continuously, resulting in a periodic shaking or vibrating motion of the motor housing.

Common Materials

Electrical Steel (Silicon Steel), High-Density Tungsten Alloy (for the weight)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Speed	3000–6000 rpm	Operating range for typical vibration applications
Eccentricity	5–20 mm	Determines centrifugal force magnitude
Unbalance Mass	0.5–5 kg	Affects vibration amplitude
Centrifugal Force	500–5000 N	Generated at rated speed
Balancing Grade	G6.3–G2.5	Residual unbalance limitISO 1940-1
Material	45#–40Cr	Carbon or alloy steel for durabilityGB/T 699, GB/T 3077
Surface Hardness	HRC 40–50	Enhances wear resistance
Surface Treatment	Zinc–Ni plating	Corrosion protection
Operating Temperature	-20–80 °C	Beyond range may affect material properties
Max Speed	8000 rpm	Structural limit
Diameter	50–200 mm	Outer diameter range
Length	100–500 mm	Overall length
Weight	2–20 kg	Depends on size and material

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

Rotor Core Part
Provides the magnetic circuit and structural base for the assembly. Typically made from laminated electrical steel to reduce eddy current losses.

Material: Electrical Steel (Silicon Steel Laminations)
Eccentric Weight Part
The deliberately off-center mass that creates the rotational imbalance necessary for vibration generation.

Material: High-Density Alloy (e.g., Tungsten, Brass)
Shaft Part
Central axis for rotation, transmits torque from the magnetic field and is supported by bearings.

Material: Hardened Steel

Applied To / Applications

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

Vibration Motor

View system integration details

Manufacturers of Rotor with Eccentric Weight

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Frequently Asked Questions

What is the function of the rotor with eccentric weight?

It converts rotational motion into vibrational energy by generating centrifugal force due to an off-center mass, causing the motor to vibrate.

What materials are typically used?

The rotor core is usually made of electrical steel (silicon steel), and the eccentric weight is often high-density tungsten alloy. The shaft may be carbon or alloy steel.

What are the typical operating parameters?

Rated speed is typically 3000–6000 rpm, eccentricity 5–20 mm, unbalance mass 0.5–5 kg, and centrifugal force 500–5000 N. These are ranges; confirm for your model.

How should I verify the balancing grade?

The balancing grade is specified per ISO 1940-1, typically G6.3 to G2.5. Verify with the manufacturer that the rotor meets the required grade for your application.

Data Basis

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pressure:	Atmospheric to 2 bar
other spec:	Max rotational speed: 3000 RPM, Vibration frequency range: 10-100 Hz
temperature:	-20°C to +120°C

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