Nidec Copal RE12 Incremental Rotary Encoder

The Rotary Encoder series includes optical and magnetic encoders. Optical models run from φ 12 to φ 30 and include small, light weight, and low cost models, as well as high resolution, and manual setting models.

Description

The Rotary Encoder series includes optical and magnetic encoders. Optical models run from φ 12 to φ 30 and include small, light weight, and low cost models, as well as high resolution, and manual setting models. These encoders can be used to sense the angle, size and rotation speed of industrial equipment, including industrial robots, numerically controlled (NC) machine tools, elevators, production equipment, terminals at financial institutions, computer peripheral equipment, etc. They can also be used as manual setting encoders for digital equipment, such as measuring, communications and medical equipment.

BASIC CONSTRUCTIONS

Optical encoders

The light from the LED which passes through the slit of the rotating disk actuates the photo-sensor. The output of the photo-sensor which is quasi-sinusoidal is shaped into square wave by the voltage comparator and fed into a logic circuit.

Magnetic encoders

Principle structure is composed of magnetic sensor and magnetic drum (corresponding to LED and photo-sensor in an optical encoder). Without power consuming LED, total dissipation power of the magnetic encoder is far less than that optical encode

Magnetic encoders
Magnetic encoders

OUTPUT SIGNALS

Quasi-sinusoidal signal output (RE20F)

Output signals of the RE20F rotary encoders are direct signals from the photo-sensor in the quasi-sinusoidal wave form. An external circuit is therefore required to shape them into square wave signals. Fig. 3 shows the output amplitude variation (ripple), ΔEs which is defined as follows.

Square wave signal output

(REC16, RES16, RES20D, REC20D, RESW20D, RECW20D, RMS20, REC20, RES20B, REC20C, RE12D, RE30E)

Output signals of the series encoders are in the form of square waves and can be fed into a digital circuit directly
without an interface. There are three versions available, for 5 V output, 12 V output and 24 V output.

OUTPUT PHASES

Output “Z” : This is an index output of one pulse per turn and is used as a reset signal or start signal. The encoders are so designed that there will be only one rising edge on CW rotation (falling edge on CCW rotation) in the output “B” during the time period when the output “Z” is “high”. Therefore, an ideal reference position signal can be obtained by getting the outputs “B” and “Z”.
Output “A” : This is a basic output and will give as many pulses per turn as the resolutinon.
Output “B” : This output is the same as the output “A” except that there is an electrical phase difference of 90° between the output “A” and “B” and is used to sense the direction of rotation.

The rotating direction is usually determined by sensing the signal level of the output “B” at the pulse edge of the output “A”.

SPEED, RESOLUTION AND FREQUENCY RESPONSE

The maximum operating speed of the encoders is given by the following formula.
Maximum speed (min-1) = Maximum frequency response (Hz) × 60/ Resolution (P/R)
Note) Encoders exceeding the above limit may be available on a special order basis.

Brand

Nidec Copal

Nidec Copal

NIDEC COPAL ELECTRONICS was established in April 1967 in Japan as a specialty manufacturer of electronics components. The company's philosophy remains unchanged - to be a supplier of high quality products while offering competitive prices. NIDEC COPAL ELECTRONICS began by developing a wirewound trimmer. This product was enthusiastically received by many sectors in the industry. The initial success of the trimmers laid the groundwork for future development of a wide selection of manufactured products that combined electronics at the start of the electronics revolution.

Later, robust sales of cermet trimmers led to the company's remarkable expansion. Further development efforts led to the release of a succession of new product lines. These included a wide range of motors, encoders, switches and pressure sensors.

Feature

  • Small size, high resolution and low cost
  • φ12 mm, High resolution up to 300 P/R
  • Cost effective
  • Two bearing types to choose from;
    Sleeve bearing or ball bearing
  • Low torque, low inertia
  • RoHS compliant

Application

  • Input equipment for lmage simulation, e.g. CAD
  • Cursol position setting for wave observation of Oscilloscope etc.
  • Level settings for ultrasound imaging devices
  • For manual setting of broadcasting system, e.g. switcher

Specification

Electrical characteristics

Resolution 100・200 P/R 300 P/R
Photo-sensor maximum current 50 mA maximum (at 25 °C)
Output wave form Quasi-sinusoidal
Output signal ※1 150 mVp-p minimum 100 mVp-p minimum
Output signal
amplitude variation ※2 
40 % maximum 50 % maximum
Light source LED

※1:Measured at CP1 as per the Fig. A of ‘MEASUREMENT CIRCUIT’ on the following page. (3 kHz)
※2 : Measured at CP2 as per the Fig. A of ‘MEASUREMENT CIRCUIT’ on the following page. (3 kHz)

Mechanical characteristics

Starting torque Ball bearing 0.05 mN·m {0.5 gf·cm} maximum
Sleeve bearing 0.4 mN·m {4 gf·cm} maximum
Inertia 0.01 g·cm2  maximum
Shaft loading Radial 1.96 N {200 gf} maximum
Axial 4.9 N {500 gf} maximum
Net weight Approx. 10 g

Environmental characteristics

Operating temp. range −10 ~ 50 °C
Storage temp.range −20 ~ 80 °C
Protection grade IP40

Output signal level & Amplitude variation

Reliability Test

Test item Test conditions
Vibration Power OFF Amplitude : 1.52 mm or 98.1 m/s2(10 G) whichever is smaller.
10 ~ 500 Hz excursion 5 min/cycle, 1 hour each for X, Y, Z, directions.
Shock Power OFF 1 time each in 6 directions (X, Y, Z) at 490 m/s2 (50 G), 11 ms.
High temperature
exposure
Power OFF 80 °C  96 h (To be measured after leaving samples for 1 h at normal temperature and humidity after the test.)
Power ON 50 °C  96 h
Low temperature
exposure
Power OFF − 20 °C  96 h
Power ON − 10 °C 96 h
Humidity Power OFF 40 °C  Relative humidity 90 〜 95 %   96 h
(To be measured after wiping out moisture and leaving samples for 1 h at normal temperature and humidity after the test.)
Thermal shock Power OFF To be done 10 cycles with the following condition
(To be measured after leaving samples for 1 h at normal temperature and humidity after the test.)
80 °C 1 h、-20 °C 1 h

Criteria

100・200 P/R 300 P/R Measurement point
Output signal level S min ≧ 0.13 V S min ≧ 0.08 V CP1 in ‘MEASUREMENT CIRCUIT’
Amplitude variation (S max / S min – 1) × 100 ≦ 45 % (S max / S min – 1) × 100 ≦ 55 % CP2 in ‘MEASUREMENT CIRCUIT’

Additional Information

Dimension

Internal Circuit

Measurement Circuit

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