Servo Motor Hollow Encoder——GSM48 Series


Widely used in the field of automatic control AC servo unit, particularly suitable for use in servo motor supporting


* Internal ASIC devices, high reliability, long life, strong anti-interference.

* Wide range of resolutions, and does not require signal conditioning.

* With A, B, Z and U, V, W six-channel signal output can be connected with standard line driver (26LS31) RS422, can provide 12 output signal, and is compatible with TTL



Definition of Models and types

Electrical Characteristics

Electrical Characteristics

Output circuit Open-collector output Voltage output Push-pull complementary outputs  Line driver
Supply voltage 5~26 5~26 5±0.25  5~26 5±0.25  5~26
Current consumption ≤80mA ≤80mA ≤80mA ≤160mA
Load current 40mA 40mA 40mA 60mA
Output high Min Vcc*70% Min Vcc-2.5V Min Vcc-1.5V Min 3.4V
Output low Max 0.4V Max 0.4V Max 0.8V Max 0.4V
Rise time Tr MAX 1us MAX 1us MAX 1us MAX 200ns
Fall time Tf MAX 1us MAX 1us MAX 1us MAX 200ns
Highest frequency response 500kHz 500kHz 500kHz 500kHz

Mechanical properties

Max speed r/min Starting torque Axis maximum load Impact Anti-vibration
6000 <0.02Nm Radial 20N Axial 10N 50G/11ms 10G 10~2000HZ
Moment inertia Work Temperature Storage Temperature Protection Degree Weight
4×10-8 -30~85℃ -40~85℃ IP50 120g

Dimensions (mm)

Output phases

Waveform ratio= X1+X2=0.5T±0.1T


Phase difference= Xn≥0.15T(n=1、2、3、4)

Z signal width: Tz=0.5T

Signal location accuracy:

A, B phase absolute angular error ≤ 0.2T

Periodic error ≤ 0.05T

T = 360 ° / N (N is the number of pulses per revolution output)

Cycle P = 360 ° / N1 ± 1.5 ° (N1 = 2,3,4)

Phase difference Yn = P / 6 ± 1.5 ° (n = 1,2,3,4,5,6)

A, B phase U, V-phase position makes no provisions

Z phase and U phase relationship: C ≤ ± 1 ° (mechanical angle)

A phase difference of 90 ° signal with a zero signal.

Direction from the shaft end (plate spring)

The spindle clockwise rotation CW waveform graph


Signal A B Z A/ B/ Z/ U V W U/ V/ W/ Vcc GND
Color Green White Yellow Green


White /Black Yellow/


Brown Grey Orange Brown






Red Black


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