Circuits, Formulas and Tables Electrical Engineering - Basic vocational knowledge (Institut für Berufliche Entwicklung, 201 p.)
 4. Electrical Machines
 4.2. Three-phase Machines
 4.2.1. Three-phase Generators 4.2.2. Three-phase Motors

### 4.2.2. Three-phase Motors

 Mains voltage designations 3 N 220V/380V 50 Hz 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:

 Power (kW) Capacity of the Capacitor 0.10 7 1.00 50 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)