x

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

688 views

2 Answers

Answer :

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.
Like 0 like

Answer :

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

image

image

image

Like 0 like

Please log in or register to answer this question.

Related Questions


What is Brushless DC Motor (BLDC) ?
Last Answer : Brushless DC Motor (BLDC)  The motor is made up of rotor and stator . In BLDC motor the rotor is a ferromagnetic material (permanent magnet). The rotor may be  ... winding gives low torque at low speed and start winding gives high torque at low speed.

Show More

539 views 1 answer



What is brushless DC motor?
Last Answer : An inverter fed trapezoidal permanent magnet AC motor drive operating in self-controlled mode is called brushless dc motor.

Show More

5 views 1 answer



State any two applications of brushless DC motor. 
Last 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. 

Show More

97 views 1 answer



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

Show More

79 views 1 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 ... .5 A from the same source will be  (A) 48.0% (B) 57.1% (C) 59.2% (D) 88.8%
Last 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%

Show More

503 views 1 answer



Where can I learn how to repair a brushless motor?
Last Answer : You can actually learn how to repair a brushless motor online. First for some background and tips read this message board string (http://www.rcgroups.com/forums/showthread.php?t=419334). There are also ... that show you how to begin fixing your motor (http://www.youtube.com/watch?v=I6GCyLm7mIw)

Show More

1 view 1 answer



In motor a permanent magnet provides: a. Electric field b. electric flux c. magnetic field d. gravitational field
Last Answer : d. gravitational field

Show More

15 views 1 answer



The following motor definitely has a permanent magnet rotor  (A) DC commutator motor (B) Brushless dc motor (C) Stepper motor (D) Reluctance motor
Last Answer : The following motor definitely has a permanent magnet rotor Stepper motor

Show More

304 views 1 answer



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°
Last Answer : d

Show More

670 views 2 answers



List out advantages and disadvantages of bridge rectifier.
Last Answer : Advantages :  1. Bridge rectifier can be used in applications allowing floating output terminals i.e. not output terminal is grounded.  2. The need of center-tapped transformer is eliminated.  ... The value of the diodes used should be precise , else there will be an error in rectification

Show More

218 views 1 answer





What Are The Advantages And Disadvantages Of Ac, Dc Motors?
Last Answer : Advantages of AC Motors: Low cost, long life, high efficiency, large ratings available (to 1 MW or more), large number of standardized types. Disadvantages of AC Motors: Starting inrush current ... DC Motors: Some can be costly, Require a controller, Higher initial cost, Requires a controller.

Show More

1 view 1 answer



Is there anywhere in Edinburgh, Scotland, I can buy brushless motors?
Last Answer : It appears that Claremont Electric Motors and AD Auto Electrics are two places that would either carry brushless motors or at least provide you with information on where you can buy brushless motors.

Show More

2 views 1 answer



Why brushless screwdriver is more preferred over brush screwdriver. From where we can buy best electric screwdriver.?
Last Answer : Brushless screwdriver has low noise low vibration and do not have the sparking issue . Brush screwdriver may give low torque after carbon brush damage.We can get best electric screwdriver from Microntech engineers . They provide kilews screwdriver

Show More

1 view 1 answer



Which of the following statements, concerning the general maintenance of a brushless generator, is correct? A. Paint should be applied to insulating surfaces on an annual basis. B. Alcohol should be used to ... . D. Accessible generator parts should be wiped with a clean dry rag on a periodic basis.
Last Answer : Answer: D

Show More

7 views 1 answer



Brushless generators are designed to operate without the use of ___________. A. brushes B. slip rings C. commutators D. all of the above
Last Answer : Answer: D

Show More

4 views 1 answer



What are the parts of a brushless AC generator?
Last Answer : Yoke, armature, stator, rotor, primary exciter, main exciter, rotary diode rectifier assembly, impeller, bearing & housing, end cover, terminal block, AVR.

Show More

2 views 1 answer



Is the idea of permanent magnet "free energy" generators impossible?
Last Answer : answer:It's hard to say. I've tried building a few myself with no avail. I have gotten close a few times though, and that's just tinkering around. The problem with permanent magnets in a ... com/watch?v=bssBAb6EzM4&feature=related This one looks like it works, but was later revealed to be a hoax.

Show More

2 views 1 answer



What does a permanent magnet repel? -Do You Know?
Last Answer : answer:

Show More

1 view 1 answer



Which of the following iron and steel is used to make a permanent magnet ?
Last Answer : Steel is used between cast iron and steel to make permanent magnets.

Show More

1 view 1 answer



Which is the most permanent strong magnet ?
Last Answer : The most durable strong magnet is nickel.

Show More

0 views 1 answer



What is a permanent magnet ?
Last Answer : Even if a magnet is removed from the magnetic field, the magnetism does not disappear, so a permanent magnet.

Show More

1 view 1 answer



When a piece of iron rod is brought near a permanent magnet for a while it becomes magnitised by?
Last Answer : Need answer

Show More

0 views 1 answer



What does a permanent magnet repel?
Last Answer : – Diamagnetic substances only

Show More

2 views 1 answer



Permanent magnet is normally made of- (a) Aluminum (b) Wrought iron (c) Cast iron (d) Alnico alloys
Last Answer : Ans: C

Show More

0 views 1 answer



Which of the following electric meter movements uses a stationary permanent magnet and movable coil? A. D'Arsonval B. Electrodynamometer C. Moving iron-vane D. Inclined coil iron-vane
Last Answer : Answer: A

Show More

4 views 1 answer



The timer element of a reverse power relay cannot be energized unless _____________. A. the power flow is the same as the tripping direction B. the power flow is the opposite to the tripping direction C. the movement of the disk is damped by a permanent magnet D. one generator is motorized
Last Answer : Answer: A

Show More

0 views 1 answer



The timer element of a reverse power relay cannot be energized unless _____________. A. one generator is fully motorized B. the movement of the disk is damped by a permanent magnet C. the power flow is the same as the tripping direction D. the power flow is the opposite to the tripping direction
Last Answer : Answer: C

Show More

3 views 1 answer



What does a permanent magnet repel?
Last Answer : D i a m a g n e t i c substances only

Show More

3 views 1 answer



Magnetic field can be produced by using A. permanent magnet B. electric current C. temporary magnet D. both A and B
Last Answer : permanent magnet

Show More

1 view 1 answer



What is the difference between a temporary and a permanent magnet?
Last Answer : A piece of steel or iron which keeps magnetic properties is called a permanent magnet. When piece of iron becomes magnetized when it is touched by magnet, which means magnetism has been induced in it. ... away from the magnet, it loses its magnetism. This type of magnet is called a temporary magnet.

Show More

2 views 1 answer



The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields (a) meter is surrounded by strong magnetic fields (b) a soft ... is used (c) a plastic shielding is provided (d) a shielding of anon-magnetic material is used
Last Answer : (b) a soft iron shielding is used

Show More

18 views 1 answer



What is the device, which depends on the action of a movalbe permanent magnet, in aligning itself in the resultant field produced by a fixed permanent magnet or current- carrying coils whose axes are displaced by a fixed angle?
Last Answer : moving-magnet instrument

Show More

6 views 1 answer



Permanent-magnet moving coil instrument can be used in
Last Answer : dc work only

Show More

13 views 1 answer



What is the reason why the scale of a permanent-magnet moving coil instrument is uniform?
Last Answer : because it is spring controlled

Show More

23 views 1 answer



The most suitable metal for making permanent magnet is a) Iron b) Steel c) Silver d) Copper
Last Answer : a) Iron

Show More

17 views 1 answer



Magnetic flux linked with a coil can be changed by using an: a. Permanent magnet b.Bar magnet c. Electromagnet d. Horseshoe magnet
Last Answer : b.Bar magne

Show More

9 views 1 answer



A permanent-magnet moving-coil instrument gives full-scale deflection with 5 mA and has a resistance of 5 Ω. Calculate the resistance of the necessary components in order that the instrument may be used as (i) a 2 A ammeter & (ii) a 100 V voltmeter.

Show More

10 views 0 answers



The coating on the plastic tape you use in your cassette players is w) diamagnetic x) paramagnetic y) ferromagnetic z) a permanent magnet
Last Answer : ANSWER: Y -- FERROMAGNETIC

Show More

16 views 1 answer



Permanent Magnet Moving Coil (PMMC) Instrument
Last Answer : Permanent Magnet Moving Coil (PMMC) Instrument

Show More

392 views 2 answers



A permanent magnet moving coil instrument gives full scale deflection of 25mA when a voltage of 75mV is applied across it. Calculate: (i) Resistance of shunt required for full scale deflection of 150 A. (ii) Series resistance for full scale deflection of 500 V.
Last Answer : Answer :

Show More

872 views 1 answer



(i) Explain the working principle of Electrostatic and permanent magnet speaker. (ii) Compare Woofer and Tweeter.
Last Answer : (i) Electrostatic speaker. The voltage is applied to the central or movable plate, the signal voltage is applied to the two outside plates causes these plates to attract or repel each other. ... to minimize the impact of this resonant frequency. (ii) Compare Woofer and Tweeter.

Show More

157 views 1 answer



Compare variable reluctance and permanent magnet motors.
Last Answer : Variable reluctance Motor  Permanent magnet motors   The rotor is not magnetised The rotor is magnetised  High torque to inertia ratio  Low torque to inertia ratio  ... rotor has salient pole construction The rotor has mostly smooth cylindrical type of construction. 

Show More

2.5k views 1 answer



Name the material used for :- (i) Moving coil (ii) Permanent magnet in PMMC instrument.
Last Answer : (i) Material used for Moving coil: Copper, Aluminum( some times)  (ii) Permanent magnets are made of special alloys such as :  Aluminum-Nickel-Cobalt (Alnicos)  Strontium-Iron  Neodymium-Iron-Boron  Samarium-Cobalt.

Show More

214 views 1 answer



What is permanent magnet and electromagnet?
Last Answer : Permanent magnet: A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. As the name suggests, a permanent magnet is 'permanent'. ... an electric current passes through the coil. If the current is interrupted, the magnetism is lost.

Show More

74 views 1 answer



Write one application of each: i) Permanent Magnet ii) Electromagnet 
Last Answer : i) Applications of Permanent Magnet: 1) Field of DC motors 2) Tacho-generators 3) In stepper motors. 4) Field of two wheeler and car dynamo 5) In magnetic therapy 6) ... Motors, Generators, Transformers, Electromagnetic Relays, Circuit breakers, Traction, Measuring instruments, Electrical Bell etc.

Show More

63 views 1 answer



Two voltmeters of same range, one moving iron type and other permanent magnet moving coil type, are connected in parallel for measuring a.c. supply voltage. If the reading of MI type is 300V, the reading of PMMC type will be (a) zero (b) higher-than M.I. type (c) lower than M.I. type (d) same

Show More

234 views 0 answers



A permanent magnet moving coil ammeter has a coil resistance of 99 ohm and Full Scale Deflection (FSD) current of 0.1mA. Shunt resistance is 1 ohm. Current through the meter at 0.5 F.S.D is:
Last Answer : A permanent magnet moving coil ammeter has a coil resistance of 99 ohm and Full Scale Deflection (FSD) current of 0.1mA. Shunt resistance is 1 ohm. Current through the meter at 0.5 F.S.D is: 0.05mA

Show More

328 views 1 answer



Permanent magnet moving coil instruments are used for
Last Answer : PMME are mostly used for measuring voltage and current.

Show More

2.6k views 2 answers



A neodymium magnet is a permanent magnet made from an alloy of _________ A) Neodymium and iron B) Neodymium, iron and iodine C) Neodymium and boron D) Neodymium, iron and boron
Last Answer : A neodymium magnet is a permanent magnet made from an alloy of Neodymium, iron and boron

Show More

75 views 1 answer


Show More⇦ PreviousNext ⇨