Advantages and Disadvantages of Permanent Magnet Brushless DC (PMBLDC) Motor

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Advantages and Disadvantages of Permanent Magnet Brushless DC (PMBLDC) Motor

Advantages of Permanent Magnet Brushless DC Motor (PMBLDC):-

•No direct contact of stator with rotor hence losses are less, speed is smooth, high speed, less noise and more efficiency.

•Hall effect sensor is use for detecting position of rotor so it gives precise control over rotor control.

•Pulse Width Modulation (PWM) technique is use so harmonics are less and torque generate is more.

•PMBLDC motor is control via solid state devices and microcontrollers so very less power is wasted.

•Gives high speed in smaller size.

•Heat produce is less and bearing stress is less because there is no winding on rotor.

Disadvantages of Permanent Magnet Brushless DC Motor (PMBLDC):-

•It require complicated hardware and software.

•Cost of PMBLDC motor is high.

•If the surrounding of PMBLDC motor is magnetic then it will affect the stator field and cause errors and decrease in speed.
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Advantages and Disadvantages of Permanent Magnet Brushless DC (PMBLDC) Motor

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Description : The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 ... .5 A from the same source will be  (A) 48.0% (B) 57.1% (C) 59.2% (D) 88.8%

Answer : The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be 48.0%

Description : What is Brushless DC Motor (BLDC) ?

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Answer : 1) Synthetic fibre drawing works.  2) Turn table drives in record players.  3) Spindle drives in hard disk circuits.  4) Computer peripheral equipments as plotters etc. 5) Gyroscope motors.  6) Biomedical machines as heart pumps. 

Description : With the help of necessary sketch, explain in brief the working of brushless DC motor. 

Answer : Constructional Diagram of Brushless DC Motor: Working of brushless DC motor: The brushless DC motor is the combination of a permanent excited synchronous motor and a frequency ... Suitable PWM techniques allow regenerative breaking, which increases dynamic and efficiency of the drive. 

Description : A permanent magnet stepper motor with 8 poles in stator and 6 poles in rotor will have a step angle of (a) 7.5° (b) 15° (c) 30° (d) 60°

Answer : d

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