Starters are used to protect DC motors from damage that can be caused by very high current and torque during startup. They do this by providing external resistance to the motor, which is connected in series to the motor's armature winding and restricts the current to an acceptable level.
Motor starters are used wherever electric motors over a certain horsepower are operated. There are several types of starters including manual, magnetic, soft-starts, multi-speed, and full voltage types, among others. Some motor starters also have a reversing feature as well as features for torque control and jogging.
The electric starter motor or cranking motor is the most common type used on gasoline engines and small diesel engines. The modern starter motor is either a permanent-magnet or a series-parallel wound direct current electric motor with a starter solenoid (similar to a relay) mounted on it.
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There are several types of starters, including manual, magnetic, soft-starts, multi-speed, and full voltage types, among others.
Three-phase motors use starters due to their high starting torque. Three-phase electric motors use three different electric legs with a 1/3-cycle lag between them. Motor starters have a set of contactors. When the motor's switch is turned on, voltage flows through the contactor's coil, creating a magnetic field.
Reduced-voltage starting
- Stator circuit series resistance starting. A three-phase electric reactor is inserted into the circuit of motor stator windings.
- Star-delta starting.
- Autotransformer starting.
Contactor Construction and Operation. A magnetic motor starter has two basic parts: the magnetic contactor and an overload relay .
- Methods of Starting Three Phase Induction Motors.
- Direct-on-Line Starter (DOL)
- Star Delta starter.
- Auto-Transformer Starting.
- Rotor Resistance Starter.
- Review.
The need for a starter is dictated by the type of motor. Generally speaking, low-power motors do not require starters, although what's considered low power may be debatable. For instance, small dc motors that run on low voltages (24 V or less) don't require starters.
When choosing a motor starter, you should consider the load, the type of motor, and the network before deciding which one is best for you. Soft Starters: Soft starters steadily ramp up the speed of a motor to prevent large current surges and to minimize the amount of wear on electrical contacts in the system.
Types of Motor Windings:
- #1. Stator Winding:
- #2. Rotor Winding:
- #3. Lap Winding:
- #4. Wave Winding:
There are two common armature winding schemes in PMDC motors; lap winding and wave winding.
Types of Armature Winding
- Simplex Type Lap Winding.
- Duplex Type Lap Winding.
- Triplex Type TLap Winding.
As an Engineman, you will be concerned with four types of starting systems: (1) electric, (2) hydraulic, (3) air motor, and (4) compressed air admission. Electric starting systems are used with gasoline engines and diesel engines used in small craft (boats).
Hence a 4-point starter is used to start and control speed of DC shunt motor.
A 4 point starter is used to start and control the speed of a Dc shunt motor with field weakening control.
A starter is a device that initiates and accelerates the motor. A controller is a device to start, control speed, reverse, stop and protect the motor. The motor's armature current is given by. Thus, the armature current Ia depends upon E and Ra if V is kept constant.
There are 4 main types of DC motors:
- Permanent Magnet DC Motors. The permanent magnet motor uses a permanent magnet to create field flux.
- Series DC Motors. In a series DC motor, the field is wound with a few turns of a large wire carrying the full armature current.
- Shunt DC Motors.
- Compound DC Motors.
rotor winding is of the squirrel-cage type where solid conductors in the slots are shorted together at each end of the rotor iron by conducting end rings. In such machines there is no need to insulate the conductors from the iron.
