Can you replace a DC motor with an AC motor?
the DC motor is not easily replaced with an AC motor. This may be because of differing shaft height and shaft diameter, difficult position or hard-to-reach components, or if they their application has special cooling needs. The situation requires fast upgrade with minimal downtime.
Why DC motor is used in rolling mills?
Rolling mill DC motors are best at low speed, high torque applications, while AC motors typically need to run above 800rpm to be cost effective. Also the case for higher efficiency of AC motors is many times negated by the wasteful braking methods of some AC drive systems.
Which motor is used in steel rolling machine?
… Permanent magnet direct-current (PMDC) motors are used in steel rolling mills, automobiles, conveyors, and various robotics applications due to their controllability, reliability, and low cost [1, 2].
Is DC motor better than AC motor?
AC motors are generally considered to be more powerful than DC motors because they can generate higher torque by using a more powerful current. However, DC motors are typically more efficient and make better use of their input energy.
What is the difference between an AC and DC motor?
The most obvious difference is the type of current each motor turns into energy, alternating current in the case of AC motors, and direct current in the case of DC motors. AC motors are known for their increased power output and efficiency, while DC motors are prized for their speed control and output range.
Which motor is useful for rolling mill drives?
The DC motors, because, of their inherent characteristics (smooth and precise speed control over the wide range), are best suited for the rolling mills.
What are the types of DC 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 best for rolling mills?
Which of the following motors are best for the rolling mills?
- A. Single phase motors.
- Squirrel cage induction motors.
- Slip ring induction motors.
- D.C. motors.
Do Teslas have AC or DC motors?
Tesla, for example, uses alternating current (AC) induction motors in the Model S but uses permanent-magnet direct current (DC) motors in its Model 3. There are upsides to both types of motor, but generally, induction motors are somewhat less efficient than permanent-magnet motors at full load.
How do you convert AC to DC?
The most common way to convert alternating current into direct current is to use one or more diodes, those handy electronic components that allow current to pass in one direction but not the other. Although a rectifier converts alternating current to direct current, the resulting direct current isn’t a steady voltage.
What is AC motor drive technology?
AC adjustable speed motor drive systems are the preferred technology for new rolling mill installations and modernization projects. TMEIC designs and manufactures two types of AC solutions for this purpose. Salient pole synchronous motors that meet the high power and torque demands of a hot strip mill, as well as roughing and finishing stands.
Why choose SMS Meer roll high speed wire rod mills?
SPEED MEETS FLEXIBILITY Single-strand high-speed wire rod mills from SMS Meer roll small sizes with high production rates – up to 120 m/s are possible. Even at full speed, the mills achieve a very good laying pattern, while tempera- ture-controlled rolling guarantees the highest quality.
Why choose a wire rod mill block?
Because every stand in the mill block is driven individually, mill owners are free in the sizing and configuration of their mill trains. Furthermore, the block simplifies service and maintenance. The payback time on the investment in a new wire rod mill is thus very short.
What’s new in the roll-in mill industry?
The roll- ing mill specialists have implemented a wide variety of solutions – from single-strand high-speed wire rod mills through combined wire rod and bar mills right up to highly flexible minimills. INNOVATIONS THAT SET STANDARDS