Lika Electronic was founded in 1982 in Schio, Italy.
First business was the manufacturing of absolute encoders,
followed by the incremental encoders for the European market.
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Today the production includes also
magnetic measurement systems,
displays &
positioning units
for the Automation Industry.
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Together with standard industrial applications,
Lika provides specific solutions tailored on customers’
requirements for high-tech markets
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Range of production
• ROTAPULS
Optical incremental encoders
• ROTACOD
Optical absolute encoders
• ROTAMAG
Magnetic incremental and absolute encoders
• LINEPULS
Incremental magnetic measurement system
• LINECOD
Absolute magnetic measurement system
• POSICONTROL
• DRIVECOD
Displays and Position controllers
Positioning Units
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• All Lika products are manufactured in Italy and sold after in-factory
tryout.
• Lika is an ISO 9001: 2001 certified Company
• All products are compliant to the following specifications/certifications:
CE marking (EN 50081-1, EN 50082-2)
CSA/UL marking
• Specific products are compliant to:
ATEX (Explosion proof)
Q+ vendor for OTIS (United Technologies Group)
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หลักการทางานและวิธีการเลือกใช้
Incremental Encoder
ROTAPULS Incremental encoders
Incremental Encoders
ROTAPULS Incremental encoders
Operation
Incremental Measuring Systems
ROTAPULS Incremental encoders
Working principle
• It is based on a grated design disc, in other words a transparent disc of
glass where a radial grating of lines and gaps forming an incremental
track is printed.
• The disc is penetrated by a light beam generated by a light source,
partially obscurated by a scanning reticle with four additional grated
fields.
• These four fields are also penetrated by the light beam. During the
disc movement they produce four phase-shifted beams. Each beam is
phase shifted of half –disc line from the other.
ROTAPULS Incremental encoders
Working principle
• The modulation index of each light beam is sensed
by photo-elements placed on the opposite side of
the disc.
• The photo-elements transform the entering light
signals in four sinusoidal current signals.
• The analogue signals are digitized and multiplied by
one interpolation circuit
• Furtherly they are sent to amplification circuits to be
conveniently powered in output
POWER SUPPLY
+Vdc
+3,3V
PHOTO-ELECTRONIC
READING
DIGITIZING
POWER
OUT
ROTAPULS Incremental encoders
Output signals
• AB channels = Bidirectional
(speed and rotation sense detection)
• AB0 = Bidirectional + Zero
• /A, /B, /0 = Complementary signals
(inverted)
ROTAPULS Incremental encoders
Output signals
• 1Vpp output circuit
• Sin/cos analogue signals for
external interpolation
ROTAPULS Incremental encoders
Methods for signals transmission
• “Normal” = 1 signal each
channel (AB0)
• connection to Push-Pull, NPN,
PNP devices
• Needs external filters for noise
reduction
• “Complementary” = additional
inverted signal for each channel
(A B 0 + /A /B /0)
• safe transmission even with
long cables and noisy
environment
ROTAPULS Incremental encoders
Manipulation of signals
Quadrature of signals (x4)
• Reading all signal fronts (A+B),
resolution increases 4 times
• ex. 500 PPR = 2000 fronts
Interpolation
• SIN/COS output signals can be
interpolated
• Interpolation “divides” a
sine/cosine signal into many
pulses
• ex. 1024 sin/cos x10 = 10240
fronts
ROTAPULS Incremental encoders
เทคนิคและวิธีการเลือก Incremental
Encoder
1) Pulse Per Revolution
ROTAPULS Incremental encoders
Scaling for Counters
ROTAPULS Incremental encoders
ROTAPULS Incremental encoders
• Example
Scaling
Wants to show centimeter
Pulses Input x Scale Factor = Display
500PPR
Circumference = 30 cm
500
SF
X
SF
30
=
=
30
=
0.06
500
With Scale SF = 0.06
ROTAPULS Incremental encoders
2) Supply and Output Circuit
NPN (10-30 Vdc)
PNP (10-30 Vdc)
Push-Pull (10-30 Vdc) > NPN/PNP
Line Driver (5 Vdc)
Push Pull / Line Driver(5-30 Vdc) >NPN/PNP
3) Output Signal
A , /A
B , /B
Z , /Z
ROTAPULS Incremental encoders
Mono/Unidirectional > 1 Channel Output > A
Quadrature/Bidirectional > 2 (Dual) Channel Output > A,B
Bidirectional with Index > 3 Channel Output > A,B,O
ROTAPULS Incremental encoders
Line Driver > 6 Channel Output > A,/A,B,/B,Z,/Z
ROTAPULS Incremental encoders
4) Shaft , Bore Diameter
Flexible Coupling
ROTAPULS Incremental encoders
5) Dimension
Body Size ( Europe= mm, U.S. = Inch )
ROTAPULS Incremental encoders
6) Connection
Connector (7-pin,10-pin, 12-pin etc. )
Cable (1,3,5,10 meter etc.)
ROTAPULS Incremental encoders
Types of assembly
With fixing bell
With fixing spring
With anti-rotation pin
With flexible coupling
ROTAPULS Incremental encoders
I40 - I41
Small encoder for industrial
applications
• I40 M20 screw fixing
• I41 3 screws fixing
• housing Ø 40.5 mm
• resolution up to 3600 PPR
• cable output
ROTAPULS Incremental encoders
I40 - I41
Small encoder for industrial
applications
• I41 preferential encoder
•packaging & food machines
• woodworking machinery
ROTAPULS Incremental encoders
I58 - I58S
International standard encoder
• housing Ø 58 mm
• shaft Ø 6, 8, 9.52, 10, 12 mm
• up to 10000 PPR
• NPN, PP, LD, Universal circuit
• cable and connector output
ROTAPULS Incremental encoders
I58 - I58S
International standard encoder
• preferential encoder
• international standard size
• motors and lift motors
ROTAPULS Incremental encoders
I58 V – sin/cos encoder
• dimensions like I58 (or I58S)
• 1Vpp standard output
(I58 A  11 µApp)
• typ. 1024 or 2048 PPR
ROTAPULS Incremental encoders
I58 V – sin/cos encoder
• standard output circuit for NCs and
drives
• motor feedback (AC, DC, Lift motors)
• tool machines
ROTAPULS Incremental encoders
IT65 - I65
encoder for heavy duty applications
• strong die-cast housing Ø65
mm
• 100 N shaft load
• standard IP65 (IP66 optional)
• NPN, PP, LD, Universal circuit
• up to 10000 PPR
ROTAPULS Incremental encoders
IT65 - I65
encoder for heavy duty applications
• standard US size
• preferential encoder
• woodworking machinery
• stone & marble machines
ROTAPULS Incremental encoders
Through-hollow shaft encoders
C59 C60 C58
C58R C58A
• up to 1024 PPR
• up to 2048 PPR
• shafts 14 or 15 mm
• “R” has collar on the back side
• BR1-xx sleeve for lower shafts
• “A” has collar on the front side
ROTAPULS Incremental encoders
Through-hollow shaft encoders
C59 C60 C58
C58R C58A
• motors with integrated brake
• spindles
• motor feedback
ROTAPULS Incremental encoders
CK59 CK60 CK58
standard blind-hollow shaft encoder
• Based on I58 standard
• up to 10000 PPR
• hollow shafts 14 or 15 mm
• BR1-xx reducing sleeve
• 3 mounting types (xx58, xx59,
xx60)
ROTAPULS Incremental encoders
CK59 CK60 CK58
standard blind-hollow shaft encoder
• Standard hollow shaft encoder
• more robust than through hollow
shaft (C58,….)
• direct coupling on draw wire support
(SF-I-5000)
• cable and connector output
• preferential encoder
ROTAPULS Incremental encoders
C81 feedback encoder
• housing Ø 80x36 mm
• shaft Ø 18 to 44 mm
• up to 4096 PPR
• max. speed 3000 rpm
• max. operating temperature range:
-40°C÷+100°C (-40°F÷+212°F)
• IP65 max.
ROTAPULS Incremental encoders
C81 feedback encoder
• big hollow shaft
• stainless steel flange
• internal parts in stainless steel
• for big sized motors, gear
motors
• lift motors
ROTAPULS Incremental encoders
CB59 Motor feedback encoder
• Sin/cos + absolute position
• 2048 PPR sin/cos
• 1 sin/cos per turn (absolute)
• blind hollow shaft Ø 14 or 15 mm
ROTAPULS Incremental encoders
CB59 Motor feedback encoder
• for brushless or gearless motors
• 2048 sin/cos for speed regulation
• Z track for rotor position at start-up
• Replaces absolute encoders,
resolvers, hall effects
ROTAPULS Incremental encoders
CK61 feedback encoder
• housing Ø 58 mm
• blind hollow shaft Ø 10 or 12 mm
• up to 10000 PPR
• max. output frequency: 300 kHz
ROTAPULS Incremental encoders
CK61 feedback encoder
• internal coupling
• shaft is fixed from backside
• easy mounting