sl70 tachometermx.nthu.edu.tw/~yucsu/3271/78.pdfspeed • the ac generator produces an ac voltage...

SL70 Tachometer

ESS3271 Lecture

Combined DC motor and AC tacho generatorDC tacho generator

Photo-transmissive disc

Photo-reflective disc

Variable reluctance sensor

Experimental Setup

• A miniature DC drive motor is used to rotate a shaft• The speed of rotation can be measured using the

various speed measurement transducers coupled to the shaft

• The devices available are– A DC tacho-generator– A AC tacho-generator– A photo-transmissive disc– A photo-reflective disc– A variable reluctance sensor– An electronic digital tachometer

Tacho Generator

• A rotating generator produces a voltage signal proportional to the rotational velocity of the input shaft

• A DC generator produces a voltage level proportional to speed

• The AC generator produces an AC voltage output with a frequency proportional to rotational speed

• In a simple two-phase motor, the AC voltage is applied to one phase of the motor and the measurement is taken off the other

• The direction of travel is determined by the phase of the signal with opposite directions being 180° out of phase

Optical Encoders

Among the most popular position measuring sensors, optical encoders find use in relatively low reliability and resolution applications

Resolvers and Synchros

Machine-tools and robotics employ resolvers and synchros to provide accurate angular and rotational information. These devices excel in

demanding factory applications requiring small size, long-term reliability, absolute position measurement, high accuracy, and low-noise operation.

Variable Reluctance• The flux produced by a permanent magnet is dependent

upon the reluctance of the magnetic circuit• Changing the reluctance changes the flux causing an

emf to be produced in a coil place in the field• Moving a ferromagnetic material through the field would

increase or decrease the flux, depending upon the relative polarities of the two magnets

• An electrical pulse would be produced across the coil due to the change in flux

Experiments

• 1 DC tacho generator• 2 AC tacho generator

– Voltage– Frequency

• 3 Photo-transmissive transducer• 4 Photo-reflective transducer• 5 Electro-magnetic transducer

DC tacho generator

AC tacho generator

Photo-transmissivetransducer

Photo-reflective transducer

Electro-magnetic transducer

Experimental Results

實驗原理

– AC Tacho Generator + Hall Effect相關問題

–請比較光學式和電磁式轉速計的特性和優缺點(例如準確度、靈敏度、和適用範圍等)。

– 請比較光學式、電容式、和超音波近接感測器的特性和優缺點(例如準確度、靈敏度、和適用範圍等)。

X200Rectangle

Yu-Chuan SuNew Stamp

Yu-Chuan SuRectangle


X200Rectangle


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Yu-Chuan SuLine

Yu-Chuan SuLine

Yu-Chuan SuLine

SL80 Proximity Sensing

ESS3271 Lecture

Experimental Setup

• Transducers are mounted on curved, vertical supports• A turntable rotating at constant speed carries samples

past the transducers• If a property of the sample material responds to the

individual transducer then the sample will be detected by that transducer

• The transducers available are– A magnetic reed switch– A variable reluctance transducer– A capacitive proximity transducer– A Hall-effect transducer– Optical transducers (transmissive & reflective)– An ultrasonic transducer

Reed Switch

Variable Reluctance• The flux produced by a permanent magnet is dependent

upon the reluctance of the magnetic circuit• Changing the reluctance changes the flux causing an

emf to be produced in a coil place in the field• Moving a ferromagnetic material through the field would

increase or decrease the flux, depending upon the relative polarities of the two magnets

• An electrical pulse would be produced across the coil due to the change in flux

Hall-Effect Transducers

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Experiments

• 1 Reed switch• 2 Variable reluctance• 3 Capacitive • 4 Hall-effect• 5 Optical• 6 Ultrasonic

請紀錄各項感測器的感應材料與範圍

Reed switch

Variable reluctance

Capacitance

Hall-effect

Optical

Ultrasonic

33 34

Output Circuit & Connection Diagram

General Data

Current Consumption

Application HintsWhen using a switching regulator , please be sure to ground the FG ( Frame Ground ) and G ( Ground ) terminal , If failure

to do so , if may resulting malfunction of the sensor for the noise of the switching regulator. The ripple of the DC power

supply is required less than 20% to avoid resulting malfunction of the sensor.

PS/PM

Operating Voltage

< 10 m/ C

NPN PNP SCR

TYPE PS=SQUARE TYPE PP=PLATE TYP PL=LONG TYPE BS=MICRO TYPE

2> SENSING DISTANCE 04= 4.0 mm 10= 10.0mm 05= 5.0 mm 15= 15.0 mm

3> OUTPUT METHOD N= NPN P= PNP

4> OUTPUT STATUS NON= NO TYPE B= NC TYPE B= NC TYPE

5> DIRECTION OF SENSING V= VERTICAL TYPE NON= HORIZONTAL TYPE

6> CONNECTION METHOD NON= LEAD WIRE TYPE PG= M 8 L EAD W IRE C ONNECTOR T YPE

INDUCTIVE PROXIMITY SENSORPS/PMseries series

DC T YPE W ITH S HORT C IRCUIT P ROTECTION

A ND POLARITY REVERSED PROTECTION

AC TYPE WITH SURGE ABSORBING CIRCUIT

MAY AVOID SURGE DAMAGED

HIGH SOLID COMPACT STRUCTURE IP-67

SUITED TO BE APPLIED IN THE POOR CIRCUMSTANCE

IP67-

ALL MODELS WITH OPERATIN LED,

EASY TO ADJUSTED

Guiding of Model

Ex. PM - 12 04 - N - B S

TUBULAR TYPETUBULAR TYPE

M1277

SQUARE TYPESQUARE TYPE

Ex. LS - 04 N - B V

PG

1> TYPE PM= SCREW TYPE

2> OUTLINE DIAMETER 08=M8x1.0 18=M18x1.0 12=M12x1.0 30=M30x1.5

3> SENSING DISTANCE 02=2.0 mm 10=10. mm 05=5.0 mm 15=15.0 mm

4> OUTPUT METHOD N=NPN P=PNP S=SCR


6> LENGTH OF BODY NON= STANDARD TYPE S= SHORT TYPE

7> CONNECTING METHOD NON= LEAD WIRE TYPE M12= M12 CONNECTOR TYPE

NOTE THE B TYPE HAVE NO STOCKMAYBE,ACCEPTED ORDER TO MANUFACTURE

1

3

4

1

3

4

-

PG= M 8 L EAD W IRE C ONNECTOR T YPE

-

SU螢光標示

SU螢光標示

33 34

Output Circuit & Connection Diagram

General Data

Current Consumption

Application HintsWhen using a switching regulator , please be sure to ground the FG ( Frame Ground ) and G ( Ground ) terminal , If failure

to do so , if may resulting malfunction of the sensor for the noise of the switching regulator. The ripple of the DC power

supply is required less than 20% to avoid resulting malfunction of the sensor.

PS/PM

Operating Voltage

< 10 m/ C

NPN PNP SCR

TYPE PS=SQUARE TYPE PP=PLATE TYP PL=LONG TYPE BS=MICRO TYPE

2> SENSING DISTANCE 04= 4.0 mm 10= 10.0mm 05= 5.0 mm 15= 15.0 mm

3> OUTPUT METHOD N= NPN P= PNP


5> DIRECTION OF SENSING V= VERTICAL TYPE NON= HORIZONTAL TYPE

6> CONNECTION METHOD NON= LEAD WIRE TYPE PG= M 8 L EAD W IRE C ONNECTOR T YPE

INDUCTIVE PROXIMITY SENSORPS/PMseries series

DC T YPE W ITH S HORT C IRCUIT P ROTECTION

A ND POLARITY REVERSED PROTECTION

AC TYPE WITH SURGE ABSORBING CIRCUIT

MAY AVOID SURGE DAMAGED

HIGH SOLID COMPACT STRUCTURE IP-67

SUITED TO BE APPLIED IN THE POOR CIRCUMSTANCE

IP67-

ALL MODELS WITH OPERATIN LED,

EASY TO ADJUSTED

Guiding of Model

Ex. PM - 12 04 - N - B S

TUBULAR TYPETUBULAR TYPE

M1277

SQUARE TYPESQUARE TYPE

Ex. LS - 04 N - B V

PG

1> TYPE PM= SCREW TYPE

2> OUTLINE DIAMETER 08=M8x1.0 18=M18x1.0 12=M12x1.0 30=M30x1.5

3> SENSING DISTANCE 02=2.0 mm 10=10. mm 05=5.0 mm 15=15.0 mm

4> OUTPUT METHOD N=NPN P=PNP S=SCR


6> LENGTH OF BODY NON= STANDARD TYPE S= SHORT TYPE

7> CONNECTING METHOD NON= LEAD WIRE TYPE M12= M12 CONNECTOR TYPE

NOTE THE B TYPE HAVE NO STOCKMAYBE,ACCEPTED ORDER TO MANUFACTURE

1

3

4

1

3

4

-

PG= M 8 L EAD W IRE C ONNECTOR T YPE

-

SU螢光標示

SU螢光標示

SU螢光標示

SU螢光標示

Yu-Chuan SuLine

Yu-Chuan SuLine



Yu-Chuan SuLine

Yu-Chuan SuLine

Yu-Chuan SuLine

Yu-Chuan SuLine

X200Rectangle


Yu-Chuan SuLine

Yu-Chuan SuLine

Yu-Chuan SuLine

Yu-Chuan SuLine

Yu-Chuan SuLine

X200Rectangle


Yu-Chuan SuLine

Yu-Chuan SuLine

X200Rectangle


Yu-Chuan SuLine

Yu-Chuan SuLine

Yu-Chuan SuLine

X200Rectangle


Yu-Chuan SuLine

Yu-Chuan SuLine

Yu-Chuan SuLine

Yu-Chuan SuLine

Yu-Chuan SuLine

Yu-Chuan SuLine

Yu-Chuan SuLine

Yu-Chuan SuLine

Yu-Chuan SuLine

Yu-Chuan SuLine

Yu-Chuan SuLine

Yu-Chuan SuLine

X200Rectangle


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