|
Motor winding
|
~ Speed tolerance
|
Typical rated speeds at 60Hz
|
Start/Stop frequency
|
Coast without brake
|
Coast with dynamic braking
|
Starting torque (% of rated torque)
|
Pros
|
Cons
|
|
Split Phase (SI)
|
+/-3%
|
1700-1750
(4-pole)
3450
(2-pole)
|
Up to 6 per hour
|
20 to 600 revolutions
|
0.5 to 6 revolutions
|
175% and up
|
No capacitors
|
Switch life 50k to 250k starts
|
|
Permanent Split Capacitor (CI)
|
+/-3%
|
1700-1750
(4-pole)
3450
(2-pole)
|
Up to 10 per minute
|
20 to 600 revolutions
|
0.5 to 6 revolutions
|
90 to 100%
|
Very reliable, Low starting current
|
Low starting torque
|
|
Three Phase (PP, Non-synchronous)
|
+/-3%
|
1700-1750
(4-pole)
3450
(2-pole)
|
Up to 10 per minute
|
20 to 600 revolutions
|
0.5 to 6 revolutions
|
200 to 400%
|
Most reliable and efficient, No cap/switch
|
Requires three-phase power supply
|
|
Reluctance Synchronous Split Phase (SY)
|
near 0%
|
1800
(4-pole)
3600
(2-pole)
|
Up to 6 per hour
|
20 to 600 revolutions
|
0.5 to 6 revolutions
|
110 to 150%
|
Same as split-phase, plus exact speed
|
Switch life 50k to 250k starts
|
|
Reluctance Synchronous Capacitor (YC)
|
near 0%
|
1800
(4-pole)
3600
(2-pole)
|
Up to 10 per minute
|
20 to 600 revolutions
|
0.5 to 6 revolutions
|
80 to 100%
|
Exact speed, Very reliable, Low starting current
|
Low starting torque
|
|
Reluctance Synchronous Three Phase (YP)
|
near 0%
|
1800
(4-pole)
3600
(2-pole)
|
Up to 10 per minute
|
20 to 600 revolutions
|
0.5 to 6 revolutions
|
200 to 500%
|
Exact speed, Most reliable and efficient, No cap/switch
|
Requires three-phase power supply
|
|
Brushless DC (BLDC)
|
near 0%
|
2500
|
Up to 10 per minute
|
20 to 600 revolutions
|
0.5 to 6 revolutions
|
175% and up
|
Exact speed control
|
Requires a control board
|
