Slewing Motor for Cranes and Excavators

Product Specifications

Technical details and manufacturing context for Slewing Motor

Definition

A slewing motor is a specialized electric or hydraulic motor designed to drive the slewing (rotational) motion of equipment such as cranes, excavators, and turntables. As part of the slewing unit, it converts electrical or hydraulic energy into controlled torque to rotate the superstructure or boom around a vertical axis. The motor is typically mounted to a slewing ring or bearing and may be coupled directly or through a gearbox to achieve the required speed and torque. In the directory, the slewing motor is listed as a component for machinery and equipment manufacturing, with reference parameters that must be verified for the specific model and application. The rated torque range is 500–5000 N·m, and the rated speed is 0.5–5 r/min, typical for slewing applications. Operating pressure is 1.0–1.6 MPa, with a maximum pressure of 2.5 MPa. Displacement ranges from 50–500 cm³/r, and for electric versions, voltage is 24 V DC with current draw of 10–50 A at rated load. The motor is available with IP ratings from IP54 to IP65 (IEC 60529) for dusty or wet environments, and operates in temperatures from -20°C to 60°C. The housing material is ductile iron QT500-7 (GB/T 1348), and the weight ranges from 50–200 kg depending on size and configuration. The mounting hole pattern has a bolt circle diameter of Ø200–Ø500 mm. Materials on file include copper windings, steel laminations, and aluminum housing. These values are reference ranges; always confirm model-specific specifications and applicable standards with the legal manufacturer or supplier before procurement or installation.

Working Principle

The motor receives power (electrical or hydraulic) and generates rotational force through electromagnetic induction or hydraulic pressure acting on pistons/vanes. This torque is transmitted via a gearbox or directly to the slewing ring/bearing, enabling precise 360-degree rotation with controlled speed and positioning. The working principle relies on the conversion of energy into mechanical rotation, with the motor's output torque and speed determined by the input power and internal design. For hydraulic motors, pressure differentials across pistons or vanes create rotation; for electric motors, electromagnetic fields interact with windings to produce torque. The gearbox, if present, adjusts the speed and torque to match the load requirements. The slewing ring then transfers the rotational motion to the superstructure, allowing smooth and controlled movement.

Common Materials

Copper windings, Steel laminations, Aluminum housing

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Torque	500–5000 N·m	Select based on load and gear ratio.
Rated Speed	0.5–5 r/min	Typical for slewing applications.
Max Pressure	2.5 MPa	Do not exceed for prolonged operation.
Displacement	50–500 cm³/r	Determines speed and torque characteristics.
Voltage	24 V DC	Other voltages available on request.
Current	10–50 A	At rated load.
IP Rating	IP54–IP65	Higher rating for dusty or wet environments.IEC 60529
Operating Temperature	-20–60 °C	Outside this range, performance may degrade.
Material	QT500-7	Ductile iron housing for strength.GB/T 1348
Weight	50–200 kg	Depends on size and configuration.
Mounting Hole Pattern	Ø200–Ø500 mm	Bolt circle diameter for mounting.

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
Rotating component that generates torque through electromagnetic or hydraulic action

Material: Electrical steel laminations
Stator
Stationary component that creates magnetic field or houses hydraulic chambers

Material: Copper windings in steel core
Housing Part
Protects internal components and provides mounting structure

Material: Cast aluminum or steel
Gearbox Optional
Trades speed for torque between motor and slewing ring on geared builds.

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Slewing Motor.

Applied To / Applications

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

Slewing Unit

View system integration details

Manufacturers of Slewing Motor

Manufacturer profiles associated with Slewing Motor.

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Frequently Asked Questions

What is a slewing motor used for?

A slewing motor provides rotational motion for slewing mechanisms in machinery such as cranes, excavators, and turntables. It rotates the superstructure or boom around a vertical axis.

What are the typical torque and speed ranges?

The rated torque range is 500–5000 N·m, and the rated speed is 0.5–5 r/min. These are reference values; confirm the exact specifications for your application with the manufacturer.

What standards apply to the operating pressure?

The operating pressure is 1.0–1.6 MPa, with a maximum of 2.5 MPa. The listed standards serve as references for pressure testing, but compliance must be verified with the supplier.

How do I choose the right slewing motor?

Selection is based on load, gear ratio, required torque and speed, and environmental conditions. Use the reference parameters as a starting point, but always consult the manufacturer for model-specific data and verification.

Data Basis

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

Preliminary Technical Classification

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pressure:	Up to 250 bar
flow rate:	5-100 L/min
temperature:	-20°C to +80°C
slurry concentration:	Up to 5% solids by weight

Slewing Motor

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards