Series Dc Motor

July 09, 2024 Post a Comment

Series dc motor

Series DC motors are generally used where high starting torque is required, and speed variations are possible. These types of direct connection motors are, for instance, used in the traction system, cranes, air compressors, vacuum cleaners, sewing machines, etc.

What are the types of DC series motor?

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.

What are the characteristics of a DC series motor?

In a DC series motor, the field winding is connected in series with the armature and hence carries the full armature current. When the load on shaft of the motor is increased, the armature current also increases. Hence, the flux in a series motor increases with the increase in the armature current and vice-versa.

What is series and shunt DC motor?

A series motor respond by decreasing its speed with small increase in current for a given load torque. A shunt motor holds its speed nearly constant with large increase in input current for same amount of load torque.

What is mean by DC series?

Series DC motors are a group of self-excited DC motors in which the field coil is connected in series to the armature winding and thus a higher current passes through it. A series DC motor mission is to turn the electrical energy into mechanical one based on electromagnetic law.

Is DC series motor self starting?

DC motors are always self-starting in nature. In AC motors, the armature is stationary while the magnetic field rotates. In DC motors, the armature rotates while the magnetic field remains stationary.

How do you run a DC series motor?

DC series motor starter The start arm is simply moved towards right to start the motor. Thus, maximum resistance is connected in series with the armature during starting and then gradually decreased as the start arm moves towards right. This starter is sometimes also called as a 2 point starter.

What is a series wound DC motor?

When the armature windings and field windings are connected in series, the motor is referred to as a “series wound” DC motor. Being connected in series means the current through the armature and the field windings is equal (Itotal= Ia= If), which allows the motor to draw a significant amount of current.

What are advantages and disadvantages of a series motor?

The series motor has the highest starting torque for a given power rating. When the motor is overloaded, the speed drops and the torque increases. While delivering high torque during an overload, the series motor draws less current and power from the source compared to a shunt or compound DC motor.

What is a series motor?

A series motor is a direct current motor that has two windings that are in series, with the same current flowing through each. Use of series motors is generally limited to cases where a heavy power demand is necessary to bring the machine up to speed, as in the case of certain elevator and hoist installations.

What is the efficiency of DC series motor?

The motors are normally designed to have maximum efficiency while working at or near full load. The efficiency of a dc motor at normal operating conditions may be as high as 95%.

Why DC series motor is variable speed?

DC Series motor is variable speed motor. Due to these characteristics motor is protected against overload. DC Series motor speed-torque characteristics are such that as torque increases speed decreases.

What is difference between shunt and series?

A series regulator is connected in series with the load to stabilize the regulator's output voltage. A shunt regulator, on the other hand, is connected in parallel to the load to stabilize the device's output voltage.

What are the three types of DC motors?

There are three main types of DC motors: separately excited, self excited, or permanent magnet.

What is the main difference between DC series motor and DC shunt motor?

In a DC shunt motor, torque is proportional to armature current (as shown in the torque equation below). In contrast, for a series-wound DC motor, torque increases as the square of armature current.

What is the speed of DC series motor?

The speed of the DC series motor is directly proportional to back EMF and inversely proportional to armature current. As Ia is zero and Ea is a constant value, so the speed of a DC series motor at no-load conditions will be infinite.

Why does Series motor start with load?

At the starting of the motor there is no back emf, so large current current flows cause high starting torque. This starting torque leads to very fast acceleration of motor if shaft is not connected to any load. This fast acceleration cause motor to damage. So series motor are always started with load.

Why DC series motor is suitable for traction?

DC series motor has develops high torque at low speeds, low torque at high speed, this is the basic requirement of traction unit. Commutating property of series motor is good so we get sparkles commutation. Torque is unaffected by variation in supply voltage. DC Series motor maintenance cost is less.

Which starter is used in DC series motor?

3 point starters and 4 point starters are used for starting dc shunt-wound motors and dc compound wound motors. 2 point starter is used for starting dc series motors.

Can a DC series motor operate in AC?

If a DC series motor is connected to a ac supply same current will flow through the series field and armature field after being rectified by the commutator. So, the machine will run but with high sparking at brush, poor pf, low speed and low efficiency.