Series wound DC motors are best for applications that require high startup torque, without the need for speed regulation. Like a shunt motor, as a load is applied to a DC series motor, the motor speed decreases, which reduces the back EMF and increases the net voltage.
Which motor is used for high torque?
Whenever precise positioning is involved, stepper motors are your friend. They’re found in printers, machine tools, and process control systems and are built for high-holding torque that gives the user the ability to move from one step to the next.
Which DC motor gives high starting torque?
Why DC series motor produce high starting torque? The torque of the DC series motor is proportional to the square of the armature current. That is why DC series motor has high starting torque. The DC series motor produces the highest torque among all kinds of motors.
Do AC motors have high torque?
AC motors are often used for their high-speed and variable torque, but typically torque will exhibit a drop as the motor speed increases. … Brushless DC motors are more efficient than those with brushes, but the efficiency gains are primarily at the low-load or no-load areas of the motor performance curve.
Do DC or AC motors have more torque?
DC motors tend to offer higher torque at lower speeds which can be valuable when starting a machine under load, or when quick acceleration is required. It may be necessary to use an AC motor with a higher horsepower rating to ensure the proper amount of torque is available at start up or at lower motor speeds.
How do you increase the torque of a DC motor?
To increase the torque … that a bit harder. All you can do, electrically (as you can do it mechanically via gears), is to reduce the source impedance to maximise the current that can be delivered for a given stator impedance. Rewind it with more turns of thinner wire.
How can we get high starting torque in induction motor?
In order to increase the starting torque, extra resistance should be added to the rotor circuit at start and cut out gradually as motor speeds up. The maximum torque is directly proportional to square of rotor induced emf at the standstill. The maximum torque is inversely proportional to rotor reactance.
Which capacitor is used in single phase motor?
Run capacitors are mostly polypropylene film capacitors (historically: metallised paper capacitors) and are energized the entire time the motor is running. Run capacitors are rated in a range of 1.5 to 100 µF, with voltage classifications of 250, 370 and 440 V.