 | Circuits, Formulas and Tables Electrical Engineering - Basic vocational knowledge (Institut für Berufliche Entwicklung, 201 p.) |
 |  | 4. Electrical Machines |
| | 4.2. Three-phase Machines |
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4.2.2. Three-phase Motors
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Mains voltage designations |
3 N 220V/380V 50 Hz |
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1 N 220V 50 Hz |
Three-phase motor with star-delta
connection (star connection)
Three-phase motor with star-delta
connection (delta connection)
terminal boards (clockwise sense of
rotation)
terminal boards (anti-clockwise
sense of rotation)
terminal boards (clockwise sense of
rotation)
terminal boards (anti-clockwise
sense of rotation)
Three-phase motor with drum switch
for clockwise and anti-clockwise rotation
Three-phase motor with lever
commutator for star-delta starting
Three-phase motor with dram switch
for star-delta starting
Three-phase motor (slip ring rotor)
with rotor starter in star connection
Three-phase motor (slip ring rotor)
with rotor starter in delta connection and controller drum for clockwise and
anti-clockwise rotation
Three-phase motor with protective
motor switch for undervoltage tripping, thermal tripping and magnetic tripping
Three-phase motor (slip ring rotor)
with rotor starter and protective motor switch for manual and magnetic tripping
Three-phase motor with control
acknowledging switch and protective motor switch
Three - phase motor in Dahlander
pole-changing connection
Three-phase motor in “with
Dahlander pole-changing connection”
Three-phase motor in “reverse
Dahlander pole-changing connection”
Rotor-fed three-phase shunt-wound
commutator motor
Three-phase motor at the
single-phase mains (A)
Three-phase motor at the
single-phase mains (B)
explanations to the wiring diagram
c1 operating capacitor, c2 starting capacitor
Frequently it is necessary to connect three-phase not ors to single-phase mains. In this connection, the following disadvantages must be taken into account. The rated output (see rating plate) will be reduced to 80 % to 65 %.
The rated torque will be reduced to 30 %.
The output or power can be calculated according to the following equation:
C = capacity of the capacitor in mF
P = power in kW
U = voltage in V
f = frequency
The following approximate values can be assumed when connecting to single-phase alternating current of 220 V:
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Power (kW) |
Capacity of the Capacitor |
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0.10 |
7 |
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1.00 |
50 |
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2.00 |
100 |
Three-phase series commutator motor
1 OFF position
2 starting, operation
3 braking
Single-phase capacitor motor with
auxiliary phase
Repulsion motor
Ward-Leonard Control low-loss speed
adjustment at the direct-current motor (General wiring
diagram)
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