A.C. SYNCHRONOUS MOTORS

'Vishal SYN' Reversible A.C. Syn. motors are Ungeared low speed 60 RPM @ 50Hz. & offering large torque range from 2kg-cm to 60   kg-cm in three NEMA frame sizes viz. O.D. 2.3. " (58 mm), 3.4 " (86 mm) & 4.2" (108 mm) and in 10 different models. The motor consist of 3 lead two phase wound stator & permanent magnet rotor.

           
 
      FEATURES
  • Instant start, stop & reversible.
  • Low speed 60 RPM @ 50 Hz.
  • Torque from 2 kg.cm to 60 kg.cm (10 models).
  • Insulation Class-B.
  • starting, running & stalling currents are same.
  • Magnetically rotor can be locked by D.C. applying.
  • Power coated cast aluminum body with steel shaft.
     CHARACTERISTICS
   

1)

A.C. Operation : motor can be directly connected to 240 V;50Hz, supply along with factory supplied R-C network in series with one of the stator winding. Change of this R-C network from one winding to other results reversal of motor direction. Single pole three position switch can be used for Forward, Reverse & Off control as shown in the following diagram. Metal varistor oxide may be used to minimize the switch contact arcing.

 
 

2)

Starting : Motor start within 1 1/2 Cycles of its applied frequency & will reach 60 RPM within 5 to 30 mS at 50 Hz. Since motor has no significant current rise on starting, this motor is ideal to an application which requires six or more starts per minute.

 
 

3)

Stalling : Motor will not be overheated if stalled because starting, full load and no load currents are same. However prolonged operation against a solid stop will eventually produce bearing failure due to the resultant shaft vibrations.

 
 

4)

Inertia Limitations : Since the motors are having extremely rapid starting, there is a limit to the inertia load at which the motor will start from rest. Addition of resilient coupling with app. 5 degree of rotational freedom or gearing with backlash between motor & load can increase the permissible inertia load handing capability.

 
 

5)

Phase Shift Network : The values of R-C network have considerable effect on motor performance. They have been chosen by 'Vishal' in such a manner that no reverse torque is produced when voltage is applied. R-C values should not be varied more than 5% so as to enhance smoother starting, give quieter operation, maximize torque & improve efficiency.
Other values may be recommended by the factory for the continuous duty specific OEM application

 
 

6)

Stopping & Holding (Braking) : Due to magnetic rotor, these motors decelerate faster than conventional motors & stop within 5 degree after turnoff with no external inertia. Application of D.C. supply to one or both motor windings after removal of A.C. supply results deceleration time 1/10th to 1/20th those available with conventional motor & the motor shaft is electrically locked after the stop. A typical circuit for applying, stopping & or holding current is shown in the following diagram.

 
 
 

7)

Back Driving : These motors act as generators when back driven. Rotating in access of 1400 RPM is not recommended because high voltages can be generated. At 1400 RPM or below suitable precautions for protection of personnel/phase shift capacitor & any other connected circuitry may be necessary when back driving.

 
     

8)

60 Hz Operation : These motors may be operated on 60 Hz, but may require a different R-C network, the factory must be consulted. Torque rating should be similar to those shown for 50Hz & speed is 72 RPM @ 60 Hz.

 

 

 

  VISHAL-SYN' A.C. SYN. MOTOR MODEL & TORQUE RATINGS : 240V, 50 Hz, 60 RPM
 
Motor Models
Max. Torque Kg-cm
Nom.Rotor Inertia
kg-cm2

Max. Moment Of Inertia Kg - cm2 Rigidly attached load

Input Current mA
Detent Torque Kg-cm
Rotor Locking D.C. Volts
O.D. mm
Length mm
Weight (app.) Kgs
 SYN-231SP
2
0.12
0.65
100
0.100
60
58
60
0.600
 SYN-341
3.5
0.61
1.45
125
0.400
60
86
68
1.400
 SYN-341SP
7
0.65
2.95
160
0.450
84
86
68
1.500
 SYN-342
14
1.28
5.80
250
0.700
42
86
120
3.100
 SYN-343
21
1.89
8.75
600
0.800
24
86
150
4.000
 SYN-421
10
3.20
4.40
150
1.000
40
108
80
3.100
 SYN-421SP
20
3.80
8.65
250
1.600
50
108
80
3.400
 SYN-422SP
28
4.00
12.30
280
1.800
55
108
80
3.700
 SYN-422
40
7.00
17.50
650
3.100
24
108
155
6.300
 SYN-423
60
10.80
25.80
1260
4.800
15
108
215
10.500
 
    

Note: If extended motor shaft is required, add suffix 'E' in the motor model selected. e.g.:SYN-341E etc.

 
A.C. SYN. Motor Model
Torque Kg-cm
Dimensions (mm)
Weight Kg.
A
B
C
D
E
F
G
ěH
ěJ
ěK
 SYN-231SP
2
58
47.2
60
6
1.2
22
21
6.35
38
6
0.600
 SYN-341
3.5
86
70
68
7
1.2
27
21
10
73
7
1.400
 SYN-341SP
7
86
70
68
7
1.2
27
21
10
73
7
1.500
 SYN-342
14
86
70
120
7
1.2
27
21
10
73
7
3.100
 SYN-343
21
86
70
150
7
1.2
27
21
10
73
7
4.000
 SYN-421
10
108
85
80
7
1.5
27
22
10
55
8
3.000
 SYN-421SP
20
108
85
80
7
1.5
27
22
10
55
8
3.400
 SYN-422SP
28
108
135
85
7
1.5
27
22
10
55
8
4.200
 SYN-422
40
108
85
155
7
1.5
50
22
15
55
8
6.300
 SYN-423
60
108
85
215
7
1.5
50
22
15
55
8
10.100
 

In view of the 'VISHAL' policy of continuous development & improvement the information in this leaflet is subject to change without notice.

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A.C. Synchronous Motor, D.C. Stepping Motor, PDMC Geared Motor, Plastic Moulded Gears, Geared Synchronous/Stepper Motor.
@ 2006 Vishal Electromag Industries