Quiz on Asynchronous Motors

What is the expression for the slip coefficient s of an asynchronous motor?

• s = n / n1

• s = (n1 - n) / n1

• s = n1 / n

• s = (n1 + n) / n1

For an asynchronous motor, when the slip coefficient s = 0, then:

• The motor no longer generates torque

• The motor is overloaded

• The rotor stops rotating

• The motor is operating optimally

The torque of an asynchronous motor is proportional to:

• Total current

• Total resistance

• Stator magnetizing current

• Rotor current

When vector controlling an asynchronous motor, the necessary feedback signals are:

• Stator current

• Rotor position

• Supply voltage

• Cooling wind speed

Regarding the control of asynchronous motors, mark True or False for the following statements:

What are the main components in a DC electric motor? (Choose 2 answers)

• Commutator

• Rotor

• Inverter

• Stator

What is the role of the controller in a BLDC motor?

• To replace the function of brushes and commutator

• To replace the rotor

• To lower the voltage

• To increase the size

When classifying DC motors by structure, which types are included?

• Stepper motor

• Asynchronous DC motor

• AC DC motor

• Self-excited DC motor and separately excited DC motor

The digital PID block used in closed-loop control of BLDC (as shown in the figure) has the task of:

• Stabilizing speed and reducing oscillation

• Reducing frequency

What is the function of the PID block used in closed-loop control of BLDC?

• Stabilize speed and reduce oscillation

• Reduce frequency

• Reduce torque

• Increase current