INTRODUCTION TO SONAR 



STATOR 

 COIL 



EXCITATION E 



E sin 9 



E cos e 



ROTOR 

 COILS 



12.105(71) 

 Figure 7-11. — Electrical resolver — schematic 

 symbol. 



Another device that should be considered 

 here, although it is an electrical assembly— not 

 electromschanical — is the electrical resolver. 

 The resolver is a computing device, and functions 

 much like a transformsr. It is capable of separat- 

 ing an electrical input vector into two right 

 angle components. The resolver has a stator 

 and a rotor, each part consisting of two separate 

 coils wound at right angles to each other. Volt- 

 ages induced on the stator coils by excitation 

 of the rotor coils depend upon the displacement 

 of the rotor with respect to the electrical zero 

 reference axis of the resolver. In solving for 

 a single vector, only one of the stator coils 

 is connected electrically and represented on a 

 schematic. Figure 7-11 shows the schematic 

 symbol of an electrical resolver. 



Q 



O 

 O 



B 



COS COSINE MECHANISM 



SIN SINE MECHANISM 



IM MECHANICAL iriTEGRATOR 



D GEAR DIFFERENTIAL 







MUL LEVER MULTIPLIER 



LO aODITIVE LEVER 

 DlfFERENTI4L 



MECHANICAL COMPUTING SYMBOLS 



io 



VWV 



V 





MS SERVOMOTOR 



R RESISTOR 



R THYRITE RESISTOR 



SW THERMAL SWITCH 



SW MICROSWITCH 



SW ROTARY SWITCH 



RH RHEOSTAT 



T TRANSFORMER 





— ^ 



OR DAMPING REACTOR 



V VACUUM TUBE 



SC SYNCHRO CAPACITOR 



RD RECTIFIER 



5CT SYNCHRO CONTROL 



TRANSFORMER 



MECHANICAL CONNECTION 



(IN AN ELECTRICAL SCHEMATIC) 



ELECTRICAL CONNECTION 



ELECTRICAL SYMBOLS 



o 



DO 



CAM MECHANICAL CAM 



DF FRICTION DRIVE 



SL LIMIT STOP 



[ 1 C MECHANICAL COUNTER 



f j DL DIAL 



DL DIAL GROUP 



b; 



HC HANDCRANK OR KNOB 



FRICTION TO FRAME 



OL LINEAR OVERRIDE 



(O) ° 



R ROTARY OVERDRIVE 



ELECTRICAL CONNECTION 



(IN A MECHANICAL SCHEMATIC) 



MECHANICAL CONNECTION 



MECHANICAL NONCOMPUTING SYMBOLS 



@ 



L INDICATOR LAMP 



A AMPLIFIER 



SO SYNCHRO DIFFERENTIAL MOTOR 





SDG SYNCHRO DIFFERENTIAL 

 TRANSMITTER 



SCT SYNCHRO CONTROL 

 TRANSFORMER 



SM SYNCHRO MOTOR 



SG SYNCHRO TRANSMITTER 



S 



^ 



MT TIME MOTOR 



MS SERVOMOTOR 



SW MICROSWITCH 



SW CAM-ACTUATED 

 MICROSWITCH 



ELECTROMECHANICAL SYMBOLS 



13.5(71) 

 Figure 7-12. — Identifying symbols and their abbreviations. 



122 



