Incremental magnetic ring encoder

ASM has announced the addition of new magnetic encoder rings, PMIR7 series, to the POSIROT® family. These incremental encoder magnetic rings are available in three sizes to accommodate different shaft sizes and yield up to 184,320 pulses per revolution in conjunction with the quadrature encoder read head, PMIS4 series. Both units were designed to operate in harsh environments.

This non-contact incremental encoder system consists of a magnetoresistive read head, PMIS4, and a dual channel magnetic ring, PMIR7. The sensor head is completely enclosed in a metal housing and generates the industry standard A, B, Z output pulses for quadrature detection with reference mark. The PMIR7 magnetic rings come in three sizes that can be quickly press-fitted onto 27, 35 or 50 mm shaft diameters. This precise and robust encoder system can generate up to 184,320 pulses per revolution. The side tracking tolerance of this magnetic encoder is +/- 1 mm.

The shielded metal housing of the compact PMIS4 sensor read head offers a high level of protection against EMC interference and thermal overload. The enclosure has an IP67 rating to protect against dirty environments. Since this encoder operates magnetically, the read head still functions even when the magnetic scale is operated in dirty industrial environments with contamination such as oil and dust.

The available ring sizes offer either decade, binary or degree division that produce up to 102,400 pulses per revolution, 131,072 pulses per revolution or 184,320 pulses per revolution, respectively. The operating temperature range spans -40 to +85 C. The available outputs are HTL, TTL and TTL24V with a maximum output frequency of 480 kHz.