Editorial Technical Reference

Torque Motor

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

Technical Definition & Core Assembly

An electromagnetic actuator that converts electrical signals into precise rotational torque for positioning control.

Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Torque Motor

Definition
A torque motor is an electromagnetic actuation component used in servo valves and other precision positioning systems. It receives low-power electrical control signals and generates proportional mechanical torque to precisely position a valve spool, flapper, or other load. This enables accurate flow or pressure control in hydraulic or pneumatic systems. The motor operates by applying current to its coil, creating a magnetic field that interacts with permanent magnets or a magnetic circuit, producing rotational torque on an armature. The torque is proportional to the input current and is used to overcome spring forces and position the mechanism. Typical materials include electrical steel laminations, copper windings, permanent magnets (neodymium or samarium-cobalt), and aluminum or steel housing. Key parameters to consider when selecting a torque motor include rated torque (0.5–50 N·m), maximum speed (100–3000 rpm), position accuracy (±0.05°), supply voltage (24 V DC ±10%), maximum current (2–15 A), operating temperature (-20–85°C), protection class (IP54–IP65 per IEC 60529), insulation class (F per IEC 60085), rotor inertia (0.001–0.5 kg·m²), weight (1–50 kg), shaft diameter (10–60 mm), and flange size (60–300 mm). These values are reference ranges and must be confirmed for the specific model and application. The motor's performance is influenced by back EMF and mechanical integrity, and derating may be required above 60°C. For proper selection, consider load torque, safety factor, and dynamic response requirements. Verify all model-specific values and standards with the legal manufacturer or supplier before procurement.
Working Principle
When an electrical current is applied to the motor's coil, it creates a magnetic field that interacts with permanent magnets or a magnetic circuit, generating rotational torque on an armature. This torque is proportional to the input current and is used to overcome spring forces and position the valve mechanism. The motor operates within specified limits of current, speed, and temperature to ensure accurate positioning.
Common Materials
Electrical steel laminations, Copper windings, Permanent magnets (neodymium or samarium-cobalt), Aluminum or steel housing
Technical Parameters
ParameterTypical rangeNotes & selection driver
Rated Torque0.5–50 N·mSelect based on load torque and safety factor.
Max Speed100–3000 rpmLimited by back EMF and mechanical integrity.
Position Accuracy±0.05 °Includes encoder resolution and control loop.
Supply Voltage24 ±10% V DCOther voltages available on request.
Max Current2–15 AContinuous rating at rated torque.
Operating Temperature-20–85 °CDerate above 60°C.
Protection ClassIP54–IP65Higher IP available with sealing.IEC 60529
Insulation ClassFClass H optional.IEC 60085
Rotor Inertia0.001–0.5 kg·m²Affects dynamic response.
Weight1–50 kgDepends on torque and frame size.
Shaft Diameter10–60 mmKeyed or D-cut per drawing.
Flange Size60–300 mmStandard NEMA or custom.

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
  • Armature Part
    Rotating component that transmits torque to the valve mechanism
    Material: Electrical steel
  • Coil assembly
    Generates magnetic field when energized with electrical current
    Material: Copper windings with insulation
  • Permanent magnets Part
    Provide constant magnetic field for torque generation
    Material: Rare earth magnets (neodymium or samarium-cobalt)
  • Bearings
    Support armature rotation with minimal friction
    Material: Stainless steel with lubrication
  • Housing Part
    Protects internal components and provides mounting interface
    Material: Aluminum alloy or stainless steel

Applied To / Applications

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

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Ambient atmospheric pressure (sealed housing)
other spec: Max continuous torque: 5-500 Nm, Peak torque: 10-1000 Nm, Speed range: 0-3000 RPM, IP65/IP67 protection standard
temperature: -20°C to +80°C (operating), -40°C to +100°C (storage)
Media Compatibility
✓ Clean dry air environments ✓ Industrial automation systems ✓ Precision positioning equipment
Unsuitable: Submerged or high-pressure hydraulic fluid environments
Sizing Data Required
  • Required continuous torque (Nm)
  • Maximum rotational speed (RPM)
  • Positioning accuracy requirement (arc-seconds)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Winding insulation breakdown
Cause: Thermal degradation from excessive current, voltage spikes, or contamination leading to short circuits
Bearing failure
Cause: Inadequate lubrication, misalignment, or excessive axial/radial loads causing wear and seizure
Maintenance Indicators
  • Unusual audible humming, grinding, or clicking noises during operation
  • Visible overheating (discoloration or thermal paint indicators) or excessive vibration
Engineering Tips
  • Implement regular thermal imaging and vibration analysis to detect early-stage electrical or mechanical anomalies
  • Ensure proper alignment during installation and maintain a clean, controlled environment to prevent contamination ingress

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 EN 60034-1:2018 (Rotating electrical machines - Part 1: Rating and performance)

Quoted from the published standard.

Manufacturing Precision
  • Bore diameter: +/-0.01mm
  • Magnetic air gap concentricity: 0.05mm
Quality Inspection
  • High-potential (hipot) insulation resistance test
  • Torque ripple measurement and harmonic analysis

Manufacturers of Torque Motor

3 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Jingjiangcity Jianken High-Speed Electricmotor Co.,Ltd.
Jiangsu, CN
Also makes: Spindle Motor
Listed on the company's own website · profile compiled by CNFX from public sources
Ruian Chuangbo Machinery Co., Ltd.
Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Sogears
Shandong, CN
Listed on the company's own website · profile compiled by CNFX from public sources

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

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Frequently Asked Questions

What is the typical rated torque range for a torque motor?

The rated torque range is 0.5–50 N·m, but the exact value depends on the specific model and application. Always confirm with the manufacturer.

What supply voltage is required?

The standard supply voltage is 24 V DC ±10%. Other voltages may be available on request, but verify with the supplier.

What protection class is available?

The protection class is IP54–IP65 per IEC 60529, depending on sealing. Higher IP ratings may be available with additional sealing.

How does temperature affect performance?

The operating temperature range is -20–85°C. Above 60°C, derating may be required. Confirm the specific derating curve with the manufacturer.

Data Basis

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

Preliminary Technical Classification
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