| |
|
COMPARISON OF MOTORS WHEN
USING SCR AND PWM DRIVES
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"
|
|
|
|
|
|
