For which motor the speed can be controlled?

The controlling of armature resistance controls the voltage drop across the armature. With this method, the speed of the DC motor can control. This method also uses a variable resistor in series with the armature. When the variable resistor reaches its minimum value, the armature resistance is at normal one.

What is speed control of dc motor?

Speed Control of DC Motor (Shunt, Series, and Compound) Often we want to control the speed of a DC motor on demand. This intentional change of drive speed is known as speed control of a DC motor. Speed control of a DC motor is either done manually by the operator or by means of an automatic control device.

Which motor has wide range of speed control?

Three-phase induction motors, synchronous motors, permanent magnet synchronous reluctance and DC excited synchronous designs, are all speed controllable.

Which DC motor is preferred for cranes and hoists?

DC series motor
1. Which DC motor is generally preferred for cranes and hoists? Explanation: DC series motor is used where high starting torque is required, thus in cranes and hoists DC series motor is used widely.

What is speed control?

Definition of speed control : equipment designed to operate automatically under certain conditions to keep the speed of a railroad train within a predetermined rate.

How can we reduce motor speed?

So, if you want to decrease speed, decrease voltage. If you want to decrease torque, decrease current. If you increase torque (say by putting a brake on the motor), you are increasing motor torque. But if you don’t change the supply of electrical power, then the mechanical power also won’t change.

Which type of following motor are most efficient?

BLDC motors are typically 85–90\% efficient or more. Efficiency for a BLDC motor of up to 96.5\% have been reported, whereas DC motors with brushgear are typically 75–80\% efficient.

Which DC motor is generally preferred?

1. Which DC motor is generally preferred for cranes and hoists? Explanation: DC series motor is used where high starting torque is required, thus in cranes and hoists DC series motor is used widely.