Applications for Brushless DC PM Motors
... BLDC motors are most often employed when the performance of the application cannot be met by competing, less expensive technologies, such as brush DC, AC induction, or stepper. Applications requiring higher acceleration and deceleration are areas where brushless DC PM motors excel. Higher spee ...
... BLDC motors are most often employed when the performance of the application cannot be met by competing, less expensive technologies, such as brush DC, AC induction, or stepper. Applications requiring higher acceleration and deceleration are areas where brushless DC PM motors excel. Higher spee ...
relays
... number of poles – the number of separate circuits that can be switched by energizing the coil a. SP = single pole (one circuit is switched) b. DP = double pole (two circuits are switch) throw – throw describes what happens to the contacts when the coil is energized a. Single Throw – energizing the c ...
... number of poles – the number of separate circuits that can be switched by energizing the coil a. SP = single pole (one circuit is switched) b. DP = double pole (two circuits are switch) throw – throw describes what happens to the contacts when the coil is energized a. Single Throw – energizing the c ...
Preventing VFD/AC Drive Induced Electrical Damage to AC Motor
... potential for contaminated insulation, which can, over time, establish a current path through the bearings. 3. Ceramic bearings: The use of nonconductive ceramic balls prevents the discharge of shaft current through this type of bearing. As with other isolation measures, shaft current will seek an a ...
... potential for contaminated insulation, which can, over time, establish a current path through the bearings. 3. Ceramic bearings: The use of nonconductive ceramic balls prevents the discharge of shaft current through this type of bearing. As with other isolation measures, shaft current will seek an a ...
more information and higher functionality introduced by modern
... various thermal protective sensors, how they work and the types of protection provided by motor protection relays. Thermal protection In order to understand how motor protection devices work, the concepts relating to thermal conditions in a motor at rest and during various stages of operation must b ...
... various thermal protective sensors, how they work and the types of protection provided by motor protection relays. Thermal protection In order to understand how motor protection devices work, the concepts relating to thermal conditions in a motor at rest and during various stages of operation must b ...
Data Sheet - Electrocomponents
... susceptible to a single solution, that of electrical contact lubrication. Proper lubrication overcomes most of the problems and additionally ensures ease of movement of all working parts. However, the lubricant must be of very special type, as when normal oils are used in this role it was found that ...
... susceptible to a single solution, that of electrical contact lubrication. Proper lubrication overcomes most of the problems and additionally ensures ease of movement of all working parts. However, the lubricant must be of very special type, as when normal oils are used in this role it was found that ...
PERMANENT-MAGNET INDUCTION GENERATORS
... capacitance, and load impedance. A few articles [2, 3, 6-8, 10, 27] on the steadystate and performance analysis of PMIG have been presented. The contribution of the important papers is presented in this section. Fukami et al. [2] developed a mathematical model to obtain the steady-state performance ...
... capacitance, and load impedance. A few articles [2, 3, 6-8, 10, 27] on the steadystate and performance analysis of PMIG have been presented. The contribution of the important papers is presented in this section. Fukami et al. [2] developed a mathematical model to obtain the steady-state performance ...
Fractional Slot Concentrated Windings: A New Method to Manage
... When high-power electric machines controlled by voltage source inverters (VSI) are designed, the best method to remain within an economically viable solution is in using the multi-star structure [1]. If we split the electrical power into numerous equal parts, each part can remain in accordance with ...
... When high-power electric machines controlled by voltage source inverters (VSI) are designed, the best method to remain within an economically viable solution is in using the multi-star structure [1]. If we split the electrical power into numerous equal parts, each part can remain in accordance with ...
Direct Torque Control of Permanent Magnet Synchronous Motor
... Abstract— Due to the features such as high efficiency and high power density Permanent Magnet Synchronous Motors (PMSM) are becoming attractive. In high performance servo applications a rapid and accurate torque control is desired preferably without the use of motion state sensor. The use of PMSM co ...
... Abstract— Due to the features such as high efficiency and high power density Permanent Magnet Synchronous Motors (PMSM) are becoming attractive. In high performance servo applications a rapid and accurate torque control is desired preferably without the use of motion state sensor. The use of PMSM co ...
HA2312001206
... servos to traction drives, due to several distinct advantages such as high power density, high efficiency, large torque to inertia ratio, and simplicity in their control[1]-[3] . In many applications, obtaining a low-frequency ripple-free torque and instantaneous torque and even flux control are of ...
... servos to traction drives, due to several distinct advantages such as high power density, high efficiency, large torque to inertia ratio, and simplicity in their control[1]-[3] . In many applications, obtaining a low-frequency ripple-free torque and instantaneous torque and even flux control are of ...
TH-HOP-16GeneratorHopkinsTestQuestions
... AC current is passed through the rotor windings AC current is passed through the stator windings DC current is passed through the rotor windings DC current is passed through the stator windings ...
... AC current is passed through the rotor windings AC current is passed through the stator windings DC current is passed through the rotor windings DC current is passed through the stator windings ...
taylor3
... Steering gears can be arranged with hydraulic control equipment known as a 'telemotor', or with electrical control equipment. The power unit may in turn be hydraulic or electrically operated. Each of these units will be considered in turn, with the hydraulic unit pump being considered first. A pump ...
... Steering gears can be arranged with hydraulic control equipment known as a 'telemotor', or with electrical control equipment. The power unit may in turn be hydraulic or electrically operated. Each of these units will be considered in turn, with the hydraulic unit pump being considered first. A pump ...
Over current and over voltage protection of permanent
... as two unit block pulses next to each other, where one of the blocks is inverted. The Haar wavelet has compact support, since it is zero outside the unit interval. This also means that it has a finite number of scaling coefficients. ...
... as two unit block pulses next to each other, where one of the blocks is inverted. The Haar wavelet has compact support, since it is zero outside the unit interval. This also means that it has a finite number of scaling coefficients. ...
Commutator (electric)
A commutator is the moving part of a rotary electrical switch in certain types of electric motors and electrical generators that periodically reverses the current direction between the rotor and the external circuit. It consists of a cylinder composed of multiple metal contact segments on the rotating armature of the machine. The commutator is one component of a motor; there are also two or more stationary electrical contacts called ""brushes"" made of a soft conductor like carbon press against the commutator, making sliding contact with successive segments of the commutator as it rotates. The windings (coils of wire) on the armature are connected to the commutator segments. Commutators are used in direct current (DC) machines: dynamos (DC generators) and many DC motors as well as universal motors. In a motor the commutator applies electric current to the windings. By reversing the current direction in the rotating windings each half turn, a steady rotating force (torque) is produced. In a generator the commutator picks off the current generated in the windings, reversing the direction of the current with each half turn, serving as a mechanical rectifier to convert the alternating current from the windings to unidirectional direct current in the external load circuit. The first direct current commutator-type machine, the dynamo, was built by Hippolyte Pixii in 1832, based on a suggestion by André-Marie Ampère. Commutators are relatively inefficient, and also require periodic maintenance such as brush replacement. Therefore, commutated machines are declining in use, being replaced by alternating current (AC) machines, and in recent years by brushless DC motors which use semiconductor switches.