Most Permanent Magnet (PM) motors were designed to be used with Silicon Controlled Rectifier (SCR) DC drives. With the advent of Pulse Width Modulated (PWM) drives, LIKE THE QDT SERIES, several things occur which allow the same motor to produce a higher Horse Power. This is a result of the form factor of a PWM drive being much less than that of a SCR DRIVE. The typical form factor for an SCR drive is 1.4 while the form factor for a PWM drives is less than 1.05. One of our Suppliers has prepared the following list of PM motors which we recommend when using our QDT series of drives. Notice the increase in horsepower when using PWM drives.

RATED HP FF1.4 FRAME RATED RMP RATED VOLTS POLYSPEDE CATALOG NUMBER RATEED HP 1.05 FF
¼ SS56C 1750 90 E25AMA-L .40
¼ SS56C 1750 180 E25AMB-L .50
1/3 SS56C 1750 90 E33AMA-L .50
1/3 SS56C 1750 180 E33AMB-L .50
½ SS56C 2500 90 E50AMA-L .75
½ SS56C 2500 180 E50WMB-L .70
½ SS56C 1750 90 E50AMA-L .70
½ S56C 1750 180 E50AMB-L .70
¾ SS56C 2500 90 E75AMA-L 1.00
¾ SS56C 2500 180 E75AMB-L 1.00
¾ SS56C 1700 90 E75AMA-L 1.00
¾ SS56C 1700 180 E75AMB-L 1.00
1 SS56C 2500 90 E100WMA-L 1.50
1 SS56C 2500 180 E100AMB-L 1.50
1 SS56C 1700 90 E100AMA-L 1.25
1 SS56C 1700 180 E100AMB-L 1.25
1.5 S56C 2500 90 E150WMB-L 2.00
1.2 S56C 1700 180 E150AMB-L 1.75
90
2 S56C/145 2500 180 E200WMB-L 3.00

Diameter of an SS56C is 4.88″ and a S56C is 5.61″

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