Neutral zone - Schunk Carbon Technology
... It is thus necessary to insure that voltage is not induced in the commutator loop at the time of the momentary short. If the short occurs when the active conductors in the armature loop are moving in parallel to the field, magnetic lines of force will not be cut and voltage will not be induced in th ...
... It is thus necessary to insure that voltage is not induced in the commutator loop at the time of the momentary short. If the short occurs when the active conductors in the armature loop are moving in parallel to the field, magnetic lines of force will not be cut and voltage will not be induced in th ...
SPH 4A - mackenziekim
... 1. From where does the word magnet originate? 2. Draw domains in a highly magnetic bar of steel. Describe the domain theory and how it is used to explain what is created when a bar magnet is broken in half. 3. Sketch the pattern of the magnetic field around: a) a bar magnet b) an electromagnet 4. Wh ...
... 1. From where does the word magnet originate? 2. Draw domains in a highly magnetic bar of steel. Describe the domain theory and how it is used to explain what is created when a bar magnet is broken in half. 3. Sketch the pattern of the magnetic field around: a) a bar magnet b) an electromagnet 4. Wh ...
Unit B
... Thermally reactive materials Piezoelectric materials – Crystals create a charge when pushed or pressed. ...
... Thermally reactive materials Piezoelectric materials – Crystals create a charge when pushed or pressed. ...
(3) and
... usual pulsewidth-modulation (PWM). • regulates speed via the back electromotive force (not require current discontinuous drives). • control is improved, and armature losses are minimized. • application in miniature mechatronic equipment. ...
... usual pulsewidth-modulation (PWM). • regulates speed via the back electromotive force (not require current discontinuous drives). • control is improved, and armature losses are minimized. • application in miniature mechatronic equipment. ...
BSNL_TTA_Electricalspecialization
... 36. The current in circuit having 5 V EMI source and 10 Ohm resistance is: a. 2 Amp b. 50 Amp c. 5 Amp d. ½ Amp 37. The chopper is a device to change a. Voltage b. Current c. Frequency d. None of these 38. The power consumption, in case of centrifugal loads (like pump, fan, blower etc) is proportion ...
... 36. The current in circuit having 5 V EMI source and 10 Ohm resistance is: a. 2 Amp b. 50 Amp c. 5 Amp d. ½ Amp 37. The chopper is a device to change a. Voltage b. Current c. Frequency d. None of these 38. The power consumption, in case of centrifugal loads (like pump, fan, blower etc) is proportion ...
SECTION (ELECTRICAL) 1. In a D.C. generator, if the brushes are
... 3. Two series motors are coupled. One motor runs as generator and other as motor. The friction losses of the two machines will be equal when a. Both operates at same voltage b. Both have same back emf c. Both have same speed d. both have same excitation ...
... 3. Two series motors are coupled. One motor runs as generator and other as motor. The friction losses of the two machines will be equal when a. Both operates at same voltage b. Both have same back emf c. Both have same speed d. both have same excitation ...
Closed Loop Control of Separately Excited DC Motor
... The variable speed, reliability and high performance are three main characteristics of an electric drive system due to which it can be easily controlled. The field of motor is connected directly to the power supply for the speed control. At the same time it is necessary for torque and speed control. ...
... The variable speed, reliability and high performance are three main characteristics of an electric drive system due to which it can be easily controlled. The field of motor is connected directly to the power supply for the speed control. At the same time it is necessary for torque and speed control. ...
Electrical_Machines_Lab_Upgrading_Proposal_Fall_2009
... The setups and kits should have all the necessary safety and protection features such as safety covers for rotational parts, short circuit protection, overload current protection, over voltage protection, and under-voltage protection etc. ...
... The setups and kits should have all the necessary safety and protection features such as safety covers for rotational parts, short circuit protection, overload current protection, over voltage protection, and under-voltage protection etc. ...
presentation final copy
... Ys = Coil pitch S = number of armature slots P = number of poles It is important that no matter the number you get you must round down to the next integer. If its 12.6 then Ys = 12. If its 10 then Ys = 10. ...
... Ys = Coil pitch S = number of armature slots P = number of poles It is important that no matter the number you get you must round down to the next integer. If its 12.6 then Ys = 12. If its 10 then Ys = 10. ...
Elec467 Power Machines & Transformers
... thru the neutral plane (a & c) the brushes short circuit the commutator bars but there is no current being generator at that time thus no S/C current will flow. When the winding is cutting thru maximum flux the commutator acts as a rotary switch to polarize the external circuit. With more than one c ...
... thru the neutral plane (a & c) the brushes short circuit the commutator bars but there is no current being generator at that time thus no S/C current will flow. When the winding is cutting thru maximum flux the commutator acts as a rotary switch to polarize the external circuit. With more than one c ...
dc motor
... Dc motor is most used electrical machine. Converts electrical to mechanical energy. The mechanical movement produced due to torque. A Dc motor should never be started without load. Starters are essential for starting all motors. Dc motor is simply converse of a Dc Generator. ...
... Dc motor is most used electrical machine. Converts electrical to mechanical energy. The mechanical movement produced due to torque. A Dc motor should never be started without load. Starters are essential for starting all motors. Dc motor is simply converse of a Dc Generator. ...
Brushed DC electric motor
A brushed DC motor is an internally commutated electric motor designed to be run from a direct current power source. Brushed motors were the first commercially important application of electric power to driving mechanical energy,and DC distribution systems were used for more than 100 years to operate motors in commercial and industrial buildings. Brushed DC motors can be varied in speed by changing the operating voltage or the strength of the magnetic field. Depending on the connections of the field to the power supply, the speed and torque characteristics of a brushed motor can be altered to provide steady speed or speed inversely proportional to the mechanical load. Brushed motors continue to be used for electrical propulsion, cranes, paper machines and steel rolling mills. Since the brushes wear down and require replacement, brushless DC motors using power electronic devices have displaced brushed motors from many applications