Three-Phase Concentric Motor Winding Techniques
Three-Phase Concentric Winding Systems
Three-phase concentric winding systems, sometimes referred to as Akella coils, consist of concentric groups where all coils within a group are wound in the same direction and typically placed in the same slots but are of different sizes. A notable drawback of this system is the necessity for multiple molds for each coil group, as each individual coil within the group has a unique size.
Coil Group Formation & Placement
The coil groups are strategically placed
Read MoreDC Motor Fundamentals: Connection, Components, and Characteristics
1. How is a DC motor made?
- A DC motor comprises a stator and a rotor. In many DC motors, usually smaller ones, the stator uses magnets to create a magnetic field. In larger DC engines, this magnetic field is achieved with field excitation windings.
The rotor, the rotating component at the center of the motor, consists of coiled wire conductors. Current is supplied to the rotor through brushes, typically made of carbon.
Note: A coil is a wound length of conductive wire with a specific purpose within
Read MoreUnderstanding Electric Motors: Components, Operation, and Control
Electric Motor Components
Electric Motors: Key components include the rotor and stator.
- Rotor: The rotating part housed inside the magnetic circuit of the stator.
- Stator: The fixed part formed by the magnetic plate with slotted windings.
External Engine Parts
External Engine Parts: These include the terminal box, type plate, axle casing, fan cap, and base fixation.
Motor Phases
Motor Phase: Single-phase motors have two windings inside: one working winding and one starting winding, along with two neutral
Read MoreTransformer and Motor Principles: EMF Equation
A transformer is an electrical device used to transfer electrical energy between two or more circuits through electromagnetic induction. It typically steps up or steps down the voltage levels in AC (alternating current) systems. Here’s a breakdown of its working principle:
Working Principle of Transformer:
The transformer works on the principle of Faraday’s Law of Electromagnetic Induction, which states that a change in the magnetic field within a coil of wire induces a voltage (EMF) in the coil.
A
Read MoreAlternators and AC Motors: Principles and Operation
Alternators
Start Operation
Alternators operate on the principle of electromagnetic induction. Rotating conductors within a magnetic field induce a sinusoidal electromotive force (EMF). This EMF connects to an external circuit via slip rings and brushes. In practice, rotating the magnetic field poles (inductor) while keeping the conductors (induced) stationary is more efficient. E = ΔΦ/Δt.
Alternator Constitution
Alternators consist of two circuits: the inductor and the induced.
Inductor Circuit
This
Read MoreSingle-Phase Motor: Working Principle, Types, and Uses
How Does a Single-Phase Motor Work?
A single-phase induction motor consists of a single-phase winding on the stator and a cage winding on the rotor. When a supply is connected to the stator winding, a magnetic field is produced.
Why Aren’t Single-Phase Motors Self-Starting?
When single-phase AC supply is given to the stator winding, it produces alternating flux, which alternates along one space axis only. It is not a rotating flux; hence, a single-phase induction motor is not self-starting.