Electrical Machines - Basic Vocational Knowledge (IBE - Deutschland; 144 pages) Introduction 1. General information about electrical machines 2. Basic principles 2.1. The magnetic field 2.2. Measurable variables of the magnetic field 2.3. Force action of the magnetic field 2.3.1. Force action on cur rent-carrying conductors 2.3.2. Force action on current-carrying coils (motor principle) 2.4. Voltage generation through induction 3. Execution of rotating electrical machines 4. Synchronous machines 5. Asynchronous motors 6. Direct current machines 7. Single-phase alternating current motors 8. Transformer

#### 2.3.2. Force action on current-carrying coils (motor principle)

Motor principle

As opposed to Figure 17, Figure 19 features a conductor loop is positioned in a rotatable manner. A force is exerted on both conductor sides. This yields an overall torque.

M = 2 • F • r

Figure 19 - Torque incidence in a conductor loop

1 Radius, 2 Effective length, 3 Current direction, 4 Force action

Motor equation

The following equation is forthcoming from the electrodynamic law of force

M = 2 • B • l • I • N • r

M = c • Φ • I

 c machine constants (constructive values) magnetic flow of the external magnetic field I current in the conductor loop or coil