Wound field DC motors 4 (series, shunt or compound) are used in industrial environments for coil feeding reels in the milling/metalforming, crane hoists, motor-driven cable reels, and elevator hoist motors.
Which motor is used in lift?
AC slip ring or DC compound motors are prefer for lifts. Shunt type commutator motors are preferred in case of single phase installation. The latest lift designs use 3-phase induction motors with variable frequency drive electronic controls.
Why is DC series motor used in Crane?
The starting torque of the DC series motor is proportional to the square of the armature current. … That is why DC series motor is capable to produce high starting torque, and it is preferred for driving heavy loads. The high inertia loads like cranes need a high starting torque. The DC series motor is used in cranes.
Which motor is preferred for overhead Travelling cranes?
The motor of a steel works duty crane must be designed with the lowest moment of inertia and high pull out torque to meet the need for repetitive operations. Motors with lower synchronous speeds are best suited. For crane and hoist motors, duty types S3, S4 and S5 as specified in IS:325-1970 are generally applicable.
Which type of motor is used?
AC brushless motors are some of the most popular in motion control. They use induction of a rotating magnetic field, generated in the stator, to turn both the stator and rotor at a synchronous rate. They rely on permanent electromagnets to operate.
Why is the DC motor preferred over AC motor?
DC motors have the advantage of: higher starting torque, quick starting and stopping, reversing, variable speeds with voltage input and they are easier and cheaper to control than AC. AC motor advantages include: lower power demand on start and minimal maintenance.
How much weight can a 1 hp motor lift?
This means with 1 hp, you can lift about 550 lbs (250 kg) at a rate of 1 ft/sec, 1100 lbs at a rate of 0.5 ft/sec, 225 lb at a rate of 2 ft/sec, 1 lb at a rate of 550 ft/sec, and so on.
What are the applications of DC motor?
Applications. DC motors are suitable for many applications – including conveyors, turntables and others for which adjustable speed and constant or low-speed torque are required. They also work well in dynamic braking and reversing applications, which are common in many industrial machines.
What are the 3 types of DC motors?
Types of DC Motors. There are 3 main types of DC motor that are available:- Series, Shunt and Compound. These terms relate to the type of connection of the field windings with respect to the armature circuit.
Which property is associated with DC motor?
Explanation: DC series motor provides very high starting torque, and at higher torques speed of the DC series motor is also maintained to constant. Both of these properties are used in applications of DC series motor.
Which switch is used for the automatic control of the motor?
Which switch is used for the automatic control of the motor? Because the HOA selector switch is a maintained switch, it operates in the same manner as the local-remote switch example.
Which motor has series characteristics?
Characteristics of a DC Series Motors:
- Speed-Current Characteristic:
- Since on no load the series motor attains dangerously high speed, which causes heavy centrifugal force resulting in the damage of machine, series motors are not suitable for the services:
- Torque-Current Characteristic:
- Speed-Torque Characteristic:
For which of the following application DC motor are still preferred?
Why are the DC motors preferred for traction applications? Explanation: DC motors are used for traction as, according to the characteristics of DC motors speed is inversely proportional to torque and square of armature current as well, if linear magnetization is concerned.
Which motor is used in fan?
In conventional ceiling fans, single phase induction motor is used. These motors consume minimum power and hence, are also known as fractional kilowatt motors. A single phase induction motor requires only one power phase for operating. It converts the electrical energy from the power input into mechanical energy.
What are the three types of motors?
Each motor has a specific application. Basic motors have been classified into three distinct types: AC motor, DC motor, and specialized motors.
What are the types of motors?
Types of Electric Motors
- 1). DC Shunt Motor. …
- 2). Separately Excited Motor. …
- 3). DC Series Motor. …
- 4). PMDC Motor. …
- 5). DC Compound Motor. …
- 1). Synchronous Motor. …
- 2). Induction Motor. …
- 1). Stepper Motor.