Which of the following is not an advantage of BLDC motor over conventional DC motor. Explanation: The brushless DC motor being more expensive compare to DC motor of same kW ratings, serves many other advantages like long life, less maintenance, rapid response, linear characteristic, no sparking and many more.
What are the advantages of BLDC motor over conventional DC motor?
In conclusion, BLDC motors have advantages over brushed DC motors and induction motors. They have better speed versus torque characteristics, high dynamic response, high efficiency, long operating life, noiseless operation, higher speed ranges, rugged construction and so on.
Which of the following is advantage of BLDC motor?
The advantages of a brushless motor over brushed motors are high power-to-weight ratio, high speed, nearly instantaneous control of speed (rpm) and torque, high efficiency, and low maintenance.
Which of the following is a disadvantage of BLDC motor over conventional DC motor?
Limited constant power range: A large constant power range is crucial to achieving high vehicle efficiencies. The permanent magnet BLDC motor is incapable of achieving a maximum speed greater than twice the base speed.
Which of the following is advantage of BLDC motor over three phase induction motor?
A BLDC motor can generate full torque at zero speed. The motors are usually smaller for any given power level, and the rotor with permanent magnets is lighter than a corresponding induction rotor. Both of these traits allow a BLDC motor to respond much faster to changing load condition.
Which are the advantages of BLDC motor Mcq?
Explanation: The BLDC motor is used in low power application. They have many advantages like low cost, simplicity, reliability, good performance, long life. Participate in Electric Drives Certification Contest of the Month Now! Explanation: Due to low inertia, BLDC motors have faster acceleration.
What are the differences between a BLDC and a conventional DC motor?
A brushed DC motor uses a configuration of wound wire coils, the armature, acting as a two-pole electromagnet. … A brushless motor, by contrast, utilizes a permanent magnet as its external rotor. In addition, it uses three phases of driving coils and a specialized sensor that tracks rotor position.
Which of the following is an advantage of brushed DC motor?
Advantages of a brushed DC motor:
Low cost of construction. Simple and inexpensive controller. No controller is required for fixed speeds. The ideal for the extreme environment due to the lack of electronics.
What are the types of BLDC motor?
Basically, BLDC are of two types, one is outer rotor motor and other is inner rotor motor. The basic difference between the two is only in designing, their working principles are same.
Is PMDC and BLDC motor same?
Despite their similar speed and torque behavior, there are two significant differences between PMDC and BLDC motors. First, PMDC motors are commutated mechanically, via brushes and a commutator, whereas BLDC motors are commutated electronically, typically via Hall effect sensors on the stator.
Which one is not an advantage of Pmsm?
Its rotor has constant magnetic but it needs the variable magnetic field so these motors want to variable frequency power source to start. Permanent magnet synchronous motors require a drive to operate it cannot run without a driver.
Which speed control method is employed in PMDC?
Which speed control method is employed in PMDC? Explanation: Unlike in DC motors, field is provided by permanent magnets in PMDC. This implies that field provided in PMDC motor is permanent and can’t be altered unless whole construction is modified. Thus, armature voltage control method is employed here.
How is speed of BLDC motor controlled?
Speed of a brushless dc motor can be controlled by controlling the input dc voltage / current. The higher the voltage more is the speed. Many different control algorithms have been used to provide control of BLDC motors. The motor voltage is controlled using a power transistor operating as a linear voltage regulator.
Which is better BLDC motor or induction motor?
The DC brushless drive can also operate at unity power factor, whereas the best power factor for the induction drive is about 85 percent. This means that the peak point energy efficiency for a DC brushless drive will typically be a few percentage points higher than for an induction drive.
Is BLDC fan better than induction motor?
Compared to regular induction fan, a BLDC fan can save upto Rs 1000-1500/ Year/fan. And because there is no heating of the motor, the life of a BLDC fan is also expected to be much higher than ordinary fans.
Is BLDC motor induction motor?
A BLDC motor, for the same mechanical work output, will usually be smaller than a brushed DC motor, and always smaller than an AC induction motor. The BLDC motor is smaller because its body has less heat to dissipate. From that standpoint, BLDC motors use less raw material to build, and are better for the environment.