Which type of motor is used in lathe?

Answer 1

The type of motor used depends on the size of the lathe.

Small "hobby" lathes use small fractional (1/8, 1/4...) horsepower ac motors which run on household single-phase power.

The lathes which are used to produce crankshafts for huge marine diesel engines - or the rotor shafts of the massive alternators used to generate megawatts of electrical power - must use giant-sized motors, producing hundreds of horsepower.

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DC SHUNT MOTORS.
Three-phase electric motor.

Answer 2

steeper or dc servo motors are b

eing bused in cnc machines.

Stepper Motors: Advantages

• The name "stepper" comes from the steps made by the motor with every signal pulse. It is simple to operate, inexpensive compared to servo motors and has a high reported accuracy. Its low speed torque enables the use of a pulley reduction and timing belt, allowing several loads to be driven without gearing.

Stepper Motors: Disadvantages

• Stepper motors typically have a lower efficiency than servo motors. It is also resonance prone, and smooth movement often requires microstepping. Loads do not accelerate rapidly due to the low torque to inertia ratio. Despite the loud noise and overheating at high performance, stepper motors have an overall low power output for their weight and size.

Servo Motors: Advantages

• Servo motors use closed-loop circuitry to transfer information to the CNC machine. A regular DC or AC motor is connected to an encoder fixed with a sensor. Servo motors have high accuracy and resolution owing to the sensor-fixed encoder. The motor is powered by the servo amp, which also counts the steps made. Its high torque to inertia ratio enables rapid load acceleration. With lighter loads, efficiency may reach up to 90 percent.

Servo Motors: Disadvantages

• Servo motors are generally more costly than stepper motors and more complicated to operate. As peak operating power only develops at high speed, and the ventilation system easily becomes contaminated, servo motors are more susceptible to damage due to overheating and overloading. They also require servicing after the brush reaches its 2,000-hour life span.

Answer 3

AC Series motors