HEDS-9140#H00

Series:	HEDS
Part Status:	Active
Encoder Type:	Optical
Output Type:	Quadrature with Index (Incremental)
Pulses per Revolution:	400
Voltage - Supply:	5V
Actuator Type:	Codewheel Not Included
Detent:	No
Built in Switch:	No
Mounting Type:	Chassis Mount
Orientation:	Vertical
Termination Style:	Terminal Pins
Rotational Life (Cycles Min):	--

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Encoders: HEDS-9140#H00 Application Field and Working Principle

Encoders are electronic devices developed to convert motion into digital signals. In particular, the HEDS-9140#H00 is an absolute multi-turn encoder that can detect the rotational position, velocity, and acceleration of a shaft at high speed and accuracy. It is extensively utilized in fields such as medical imaging, factory automation, robot control, railway signaling, navigational systems, and aerospace subsystems. Moreover, it is a valuable component to measure the angular position, i.e. angular displacement and rotational speed, accurately.

Design and Configuration

The HEDS-9140#H00 encoder is a totally electromagnetic device composed of several components. These include a rotary disk, a fixed magnetized disk, a solid-state optical encoder head, a mechanical housing, and external signal processing electronics.The rotary disk is connected to the shaft whose angle is to be measured, and contains a series of alternating transparent and opaque sectors. A single segment can code one digit.The fixed magnetized disk is installed to be parallel to the rotary disk and is equipped with several magnetized regions. The magnitized regions are divided into groups of two or more pairs, in which each pair consists of one permanent magnet and one ferromagnetic element.The encoder head comprises two light emitting diodes (LEDs), two photodiodes, a chopper circuit, and a narrow optical filter. The LEDs emit infrared beams perpendicularly to the rotary disk, whose reflection intensity is modulated by the disks opaque sectors. The lasers are then received by the photodiodes. The chopper circuit is used for error compensation when the direction of rotation is changed. The optical filter is used to eliminate stray light.

Working Principle

The fundamental working principle of the HEDS-9140#H00 encoder is based on the magnetic field that is generated by the magnetized regions on the fixed disk in response to the polarized beams from the two LEDs in the encoder head, which is interrupted by the opaque segments of the rotary disk. When the rotary disk rotates, the magnets alternate between adjacent poles and a varying sine wave is induced in the encoder head. This sinusoidal signal generated by the encoder head is then processed by the output electronics to obtain a digital output equivalent to the angular displacement of the shaft. The digital output can then be used to measure the angular position, angular velocity, and acceleration of the shaft.

Conclusion

The HEDS-9140#H00 encoder is a valuable device for measuring the angular position, angular velocity, and acceleration of a shaft at high speed and accuracy. It can be used in a wide variety of applications such as medical imaging, factory automation, robot control, railway signaling, navigational systems, and aerospace subsystems. The encoder’s working principle is based on interrupting the alternating magnetic field from the fixed disk by the opaque segments of the rotary disk, generating a sinusoidal signal in the encoder head. The output electronics then process this signal to obtain a digital output equivalent to the angular displacement of the shaft.

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