A
the speed regulation of a DC motor is proportional to the?
Resistance of the armature
The rotor of a servodisc motor is made from copper laminated onto a fiberglass disk, the motor is also called?
Printed circuit motor
A device that converts electrical input into mechanical output is called?
Motor
The motor that does not contain a wound armature, commutator, or brushes is the what motor?
Brushless DC
A compound motor has what field windings?
Series and Shunt
Brushless DC motors that require very smooth operation such as grinders that produce a finished surface are powered by what type of wave?
Sine waves
What is the name of the protective device that is connected in series with the shunt field and found on most large compound DC motors?
Field loss relay
What limits the amount of current flow through the armature when power is first applied to the motor?
armature resistance
In a compound DC motor circuit, the field loss relay will disconnect the ____ if power is lost to the_____?
armature/Shunt field
Small permanent magnet motors that have lightweight rotors are often used as?
servomotors
Most converters that supply power to brushless DC motors produce what type of wave?
Trapezoidal
Permanent magnet motors have what kind of efficiency over wound field motors?
Higher
The servomotor which has a fiberglass and copper rotor is the what motor?
Servodisc
When the field winding of a DC motor is connected in parallel with the armature, the motor is called?
Shunt
A force that tends to cause rotation is known as?
Torque
Some DC servomotors have square wave input voltage. To vary the motor speed, the on and off time ratio of the square wave is varied. This is called what modulation?
Pulse-width
What type of motor can develop extremely high starting torque?
Series
When full voltage is applied to both the armature and the shunt field, the motor operates at?
Basespeed
What type of motor must never be operated under a no load condition?
Series
The compound motor connection that is rarely used is the?
Differential
When reduced voltage is applied to the armature and full voltage is maintained to the shunt field, the motor operates at?
Underspeed
List 3 basic types of DC motors?
Series/Shunt/Compound
The speed regulation of a DC motor is proportional to the?
Armature resistance
The DC motor, known as a '' constant speed motor'' is?
Shunt
Torque is a force that tends to cause?
Rotation