Position Encoder/Resolver

Product Specifications

Technical details and manufacturing context for Position Encoder/Resolver

Definition

A position encoder/resolver is a feedback component used in drive motors and actuators to measure the rotational angle or linear displacement of a shaft or mechanism. It provides real-time positional data to the control system, enabling closed-loop control for accurate speed regulation, torque control, and precise positioning in automated machinery and motion control systems. The device operates by generating an electrical signal—analog sine/cosine waves for resolvers, digital pulses for encoders—whose phase, frequency, or pulse count corresponds directly to the shaft's angular position. The control system interprets this signal to determine exact position, speed, and direction. Typical specifications include resolution of 10–16 bits, accuracy of ±0.01°, supply voltage of 5 V DC ±5% or 24 V DC ±10%, and output signals such as incremental (TTL/HTL) or absolute (SSI/BiSS). Operating temperature ranges from -40 to +85 °C, with protection class IP54–IP67 per IEC 60529. Shaft diameters are 6–14 mm, maximum rotational speed is 6000–12000 rpm, and moment of inertia is ≤ 5×10⁻⁶ kg·m². Housing is typically aluminum alloy, with stainless steel shaft. Weight ranges from 0.2–0.5 kg, and connection is via cable or M12 connector. These values are reference ranges; verify model-specific data with the manufacturer. The device is constructed with materials such as aluminum alloy, stainless steel, PCB, and magnetic or optical sensing elements. It is essential for applications requiring high dynamic response and reliability. Always confirm that the selected model meets the required resolution, accuracy, and environmental conditions for your specific application.

Working Principle

The encoder or resolver generates an electrical signal that varies with the angular position of the shaft. For resolvers, the output is analog sine and cosine waves whose amplitudes encode the angle. For encoders, the output is digital pulses (incremental) or a serial data stream (absolute) that represents position. The control system measures the phase, frequency, or pulse count to determine the exact position, speed, and direction of rotation. This feedback is used in closed-loop control to adjust motor operation for precise positioning and speed regulation.

Common Materials

Aluminum Alloy, Stainless Steel, PCB (Printed Circuit Board), Magnetic/Optical Sensing Elements

Technical Parameters

Parameter	Typical range	Notes & selection driver
Resolution	10–16 bit	Higher resolution for precise positioning
Accuracy	±0.01 °	Critical for closed-loop control
Supply Voltage	5 V DC ±5% or 24 V DC ±10% V DC	Match with control system
Output Signal	Incremental (TTL/HTL) or Absolute (SSI/BiSS)	Choose based on controller interface
Operating Temperature	-40–+85 °C	Extended range for harsh environmentsIEC 60068-2-1/2
Protection Class	IP54–IP67	Higher IP for dust/moistureIEC 60529
Shaft Diameter	6–14 mm	Match with mating shaft
Max. Rotational Speed	6000–12000 rpm	Exceeding may cause mechanical failure
Moment of Inertia	≤ 5×10⁻⁶ kg·m²	Low inertia for dynamic response
Material	Aluminum housing, stainless steel shaft	Corrosion resistance
Weight	0.2–0.5 kg	Consider for mounting
Connection Type	Cable or M12 connector	Cable for fixed, connector for quick disconnect

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
Rotates with the motor shaft, containing the pattern (optical disk, magnetic poles) that generates the position signal.

Material: Aluminum/Steel with optical or magnetic coating
Stator/Sensor Head
Stationary part containing light sources (LEDs), photodetectors, or magnetic sensors that read the rotor's pattern to generate electrical signals.

Material: PCB with electronic components, housed in aluminum
Shaft Coupling
Mechanically connects the encoder rotor to the motor shaft, ensuring accurate torque transmission and alignment.

Material: Stainless Steel or Aluminum

Applied To / Applications

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

Drive Motor & Actuators

View system integration details

Manufacturers of Position Encoder/Resolver

Manufacturer profiles associated with Position Encoder/Resolver.

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Frequently Asked Questions

What is the difference between an encoder and a resolver?

An encoder typically provides digital output signals (incremental or absolute) using optical or magnetic sensing, while a resolver provides analog sine/cosine signals. Encoders offer higher resolution in bits, while resolvers are often more robust in harsh environments.

How do I choose between incremental and absolute output?

Incremental encoders provide relative position and require a reference point at startup, while absolute encoders provide absolute position immediately. Choose based on your controller interface and whether you need position retention after power loss.

What is the significance of protection class IP54–IP67?

The IP rating indicates resistance to dust and water ingress. IP54 offers limited protection against dust and splashing water, while IP67 provides full dust protection and temporary immersion. Select based on your operating environment.

Can I use this encoder/resolver in high-speed applications?

The maximum rotational speed is 6000–12000 rpm, but the actual limit depends on the specific model and mechanical design. Exceeding the rated speed may cause mechanical failure. Verify the speed rating with the manufacturer for your application.

Data Basis

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Preliminary Technical Classification

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pressure:	Atmospheric to 2 bar (typical), IP67/IP69K rated for environmental protection
other spec:	Resolution: 12-24 bit, Accuracy: ±0.1° to ±0.01°, Vibration: 10-2000 Hz at 10g, Shock: 100g for 6ms
temperature:	-40°C to +125°C (operating), -55°C to +150°C (storage)

Product Specifications

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