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A.C. SYNCHRONOUS MOTORS |
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'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. |
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FEATURES |
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- Instant start, stop & reversible.
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Low speed 60 RPM @ 50 Hz.
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Torque from 2 kg.cm to 60 kg.cm (10 models).
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Insulation Class-B.
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starting, running & stalling currents are same.
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Magnetically rotor can be locked by D.C. applying.
- Power
coated cast aluminum body with steel shaft.
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CHARACTERISTICS |
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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. |
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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. |
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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. |
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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. |
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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 |
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6) |
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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. |
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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. |
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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. |
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VISHAL-SYN' A.C. SYN. MOTOR MODEL & TORQUE RATINGS : 240V, 50 Hz, 60 RPM |
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Motor Models
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Max. Torque Kg-cm
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Nom.Rotor Inertia
kg-cm2
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Max. Moment Of Inertia Kg - cm2 Rigidly attached load |
Input
Current mA
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Detent Torque Kg-cm
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Rotor Locking D.C. Volts
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O.D. mm
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Length mm
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Weight (app.) Kgs
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SYN-231SP |
2
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0.12
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0.65
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100
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0.100
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60
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58
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60
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0.600
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SYN-341 |
3.5
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0.61
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1.45
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125
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0.400
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60
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86
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68
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1.400
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SYN-341SP |
7
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0.65
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2.95
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160
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0.450
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84
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86
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68
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1.500
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SYN-342 |
14
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1.28
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5.80
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250
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0.700
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42
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86
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120
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3.100
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SYN-343 |
21
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1.89
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8.75
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600
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0.800
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24
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86
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150
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4.000
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SYN-421 |
10
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3.20
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4.40
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150
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1.000
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40
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108
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80
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3.100
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SYN-421SP |
20
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3.80
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8.65
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250
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1.600
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50
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108
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80
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3.400
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SYN-422SP |
28
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4.00
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12.30
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280
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1.800
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55
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108
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80
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3.700
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SYN-422 |
40
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7.00
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17.50
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650
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3.100
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24
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108
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155
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6.300
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SYN-423 |
60
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10.80
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25.80
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1260
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4.800
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15
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108
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215
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10.500
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Note: If extended motor shaft is required, add suffix 'E' in the motor model selected. e.g.:SYN-341E
etc. |
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A.C. SYN. Motor Model
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Torque Kg-cm
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Dimensions (mm)
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Weight Kg.
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A
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B
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C
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D
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E
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F
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G
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ØH
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ØJ
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ØK
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SYN-231SP |
2
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58
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47.2
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60
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6
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1.2
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22
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21
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6.35
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38
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6
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0.600
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SYN-341 |
3.5
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86
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70
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68
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7
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1.2
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27
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21
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10
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73
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7
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1.400
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SYN-341SP |
7
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86
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70
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68
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7
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1.2
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27
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21
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10
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73
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7
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1.500
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SYN-342 |
14
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86
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70
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120
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7
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1.2
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27
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21
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10
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73
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7
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3.100
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SYN-343 |
21
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86
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70
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150
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7
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1.2
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27
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21
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10
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73
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7
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4.000
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SYN-421 |
10
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108
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85
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80
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7
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1.5
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27
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22
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10
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55
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8
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3.000
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SYN-421SP |
20
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108
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85
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80
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7
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1.5
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27
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22
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10
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55
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8
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3.400
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SYN-422SP |
28
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108
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135
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85
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7
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1.5
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27
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22
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10
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55
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8
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4.200
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SYN-422 |
40
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108
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85
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155
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7
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1.5
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50
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22
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15
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55
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8
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6.300
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SYN-423 |
60
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108
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85
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215
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7
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1.5
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50
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22
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15
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55
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8
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10.100
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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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@ 2006 Vishal Electromag Industries |
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