Technical DataRotary Encoder

Rotary encoder

Magnetic Encoder

The MR sensor and ASIC developed by the original technology based on the concept of "very small and high performance" are employed. (MR-13 andMR-16, magnetic rotary encoder)

wide range resolution can be selected by multiplying signals detected by the MR sensor via the ASIC. (MR-13 and MR-16, magnetic rotary encoder)

As designed in one unit with a motor, these magnetic rotary encoders are very small, yet offer such features as 3 channels, high resolution and line driver outputs. (MR-13, MR-16)

Magnetic rotary encoder which can be wide variety of combination with coreless motors is possible.

Optical Encoder

A reflective encoder carrying light emitting and receiving elements and code wheel.
Optical type rotary encoder can be used in a magnetic environment.

Model Magnetic Optical
MR-8 MH-10 MR-13 MRS-13 MR-16 MK-16
Diameter φ8 φ10 φ13 φ13 φ16 φ16
Channel 2ch (A,B) 2ch (A,B) 3ch (A,B,Z) 2ch (A,B) 3ch (A,B,Z) 2ch (A,B)
Resolution 12P/R 12P/R 32~256P/R 16P/R 64~512P/R 36~200P/R
Maximum response frequency 20kHz 20kHz 80kHz 20kHz 160kHz 30,60kHz
Output signal TTL Compatible TTL Compatible Voltage differential
TTL Compatible
Voltage differential
TTL Compatible
TTL Compatible TTL Compatible

Magnetic Encoder

  • ① Motor
  • ② Motor terminal
  • ③ Motor shaft
  • ④ Magnetic shield
  • ⑤ Magnetic wheel
  • ⑥ ASIC
  • ⑦ MR sensor
  • ⑧ Cap

Optical Encoder

  • ① Motor
  • ② Motor terminal
  • ③ Motor shaft
  • ④ Code wheel
  • ⑤ Light emitting element
  • ⑥ Light receiving element
  • ⑦ Cap


Rotary encoder outputs pulse signals in proportion to the amount of rotation. It can be detected by counting the number of pulses from any reference position. The direction of rotation also can be detected by a phase difference (lead, lag) of A and B phases.

MR (Magnetic-Resistance) sensor

A sensor that utilizes a magnetic-resistance (MR) element that changes in resistance according to changes in the magnetic field strength.

Resolution (P/R)

The number of pulses of signals output from rotary encoder per revolution of the motor shaft. As the resolution becomes higher, finer control becomes possible.

Output signal

Phase A : Square wave signal output by the number of resolution.
Phase B : A signal having a phase difference from Phase A and is capable of detecting a direction of rotation by its difference (lead and lag).
Phase Z : Outputs one pulse per revolution (for origin detection).

Maximum response frequency

Maximum signal per second that rotary encoder can be response. The maximum speed, resolution and maximum response frequency are related to each other as expressed by the following equation:


TTL:Transistor Transistor Logic
Output by square waves of High (2.4V or over) and Low (0.4V or below).

Line driver

Noise-caused disturbances can be reduced because two signals having a 180-degree phase difference from each output are output (differential output).