Servo Motor Basics Quiz

What is a servo motor?

• A motor used for antenna positioning systems

• A motor used for metal cutting and forming machines

• A type of motor used in military applications

• A device that rotates parts of a machine with high efficiency and precision

What is the primary difference between AC and DC motors in terms of speed control?

• AC motors have speed determined by the frequency of the applied voltage and the number of magnetic poles, while DC motors have speed directly proportional to the supply voltage

• DC motors have speed determined by the frequency of the applied voltage and the number of magnetic poles, while AC motors have speed directly proportional to the supply voltage

• AC motors have constant speed regardless of the supply voltage, while DC motors have variable speed based on the frequency of the applied voltage

• DC motors have constant speed regardless of the supply voltage, while AC motors have variable speed based on the number of magnetic poles

What is the main advantage of brushless DC motors over brushed DC motors?

• Higher reliability and simplicity

• Higher efficiency and reliability

• Lower cost and simplicity

• Less noise and higher efficiency

What is the purpose of an encoder in a servo motor?

• To convert AC current to DC current

• To control the rotational speed of the motor

• To provide speed and position feedback

• To commutate the motor mechanically

What is the main difference between synchronous and asynchronous AC servo motors?

• Synchronous motors rotate at the same speed as the stator’s rotating magnetic field, while asynchronous motors rotate at a speed slower than the stator’s rotating magnetic field

• Synchronous motors require a rotor current, while asynchronous motors do not

• Synchronous motors use a commutator for commutation, while asynchronous motors use Hall effect sensors

• Asynchronous motors have higher efficiency due to the absence of rotor current

What is the function of the control circuit in a servo motor?

• To determine the amount of movement for the motor shaft based on the electric signal

• To control the rotational speed of the motor

• To provide power to the motor armature

• To produce the desired speed of the motor based on the voltage applied

What is the role of the potentiometer in controlling the speed of a DC servo motor?

• It determines the amount of movement for the motor shaft

• It controls the length of the pulse applied to the error amplifier

• It provides feedback to the servo motor controller

• It produces a voltage which is applied as one of the inputs to the error amplifier

What is the purpose of the gear assembly in a servo motor?

• To determine the amount of movement for the motor shaft based on the electric signal

• To control the rotational speed of the motor

• To move the output shaft to a particular angle, position, and velocity

• To provide feedback to the servo motor controller

In what type of application are AC servo motors more commonly used?

• Military applications such as bomb detection

• Antenna positioning systems

• Industrial applications such as with robots and in-line manufacturing

• Commercial applications such as camera auto focus

What is the function of the armature in a servo motor?

• To rotate the motor shaft until the error becomes zero

• To produce the desired speed of the motor based on the voltage applied

• To provide power to the motor armature

• To compare the voltage generated from the current position of the motor with the desired position