Vishal Electromag Industries Mumbai, Maharashtra

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.

'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.

• Basic motor speed60 RPM
• Geared Out out efficiency60%
• Gear material (spur gear)Metal
• Gear Box Ratio available  1:3, 1:4, 1:6, 1:12, 1:15, 1:20, 1:60
• Geared Output RPM available1,3,4,5,10,15,20

• Iec Frame Sizes58 mm, 86 mm & 108 mm
• PhaseTwo phase pair (four phase)
• Step Angles                 1.8° full step; 0.9° half step
• Angular Accuracy          ± 5% non-cumulative (No load)
• Swithching Sequence    4 step (Full step); 8 step (Half step)
• Stator winding              Bifiliar, 6 leads or optional 8 leads
• Operating Temp          -10° C to 50° C
• Temp Rise                    Max 80° C
• Insulation Class   Class B
• Insulation Resistance     100 MΩ min. at 500 V.D.C.
• Dielectric Strength500V A.C. for 1 Minute
• Type                           Hybrid Type; Unipolar or Bipolar
• Holding Torque        2 to 60 kg-cm in 12 models

Vishal introduces (Acetal copolymer resin-like delrin) white plastic moulded 20 DP gears range. This is very strong material and requires no lubrication for gears.   STANDARD GEARS  :     Gears with 12, 16, 20 and 24 teeths are available without center aluminum bush but with 3/8 dia. D slot.  Available with 24, 30, 36. 40, 48, 64, 80, 96, 108 and 180 teeth & have center aluminum bush with 3/8" hole with 3 nos. screws / tapped holes provided for easy mounting.        COMPOUND GEAR  :     (Gear / pinion assembly single piece moulded) are available with following gear ratio... 1) 1:2 ---- 20 x 40 teeths 2) 1:3 ---- 16 x 48 teeths 3) 1:4 ---- 12 x 48 teeths 4) 1:1.875  16 x 30 teeths   These simple and compound gears can be used in special purpose machines and are available ex-stock or within 1 to 2 weeks. It can also be coupled with 'vishal-syn' A.C. Synchronous motors or D.C. stepping motors or PMDC geared motors.   For bulk requirement we can develop moulded gears with other module / D.P. or teeth as per your specific requirements and drawing.