EASA`s "Getting the most from your Electric Motors"
... an adjustable-speed drive (ASD) or variable-frequency drive (VFD) application, use an “inverter-duty” motor (or provide suitable filtering) and keep the supply cable length within the motor manufacturer’s guidelines. Use supply conductors designed for ASD circuits to reduce the risk of overvoltages ...
... an adjustable-speed drive (ASD) or variable-frequency drive (VFD) application, use an “inverter-duty” motor (or provide suitable filtering) and keep the supply cable length within the motor manufacturer’s guidelines. Use supply conductors designed for ASD circuits to reduce the risk of overvoltages ...
How do you take the first step towards an energy efficient
... catalog motors, which are subject to the law, with the efficiency classification / nomenclature IE1 or IE2. Regarding the standard, the motors will be changed over from today‘s EFF nomenclature to the IE nomenclature specified by law in the future (e.g. EFF2 IE1). ...
... catalog motors, which are subject to the law, with the efficiency classification / nomenclature IE1 or IE2. Regarding the standard, the motors will be changed over from today‘s EFF nomenclature to the IE nomenclature specified by law in the future (e.g. EFF2 IE1). ...
THE FUNDAMENTALS OF AC ELECTRIC INDUCTION MOTOR
... slotted ferromagnetic material, but the rotor winding may be either the squirrel-cage type or the wound-rotor type. The latter is of a form similar to that of the stator winding. The winding terminals are brought out to three slip rings. This allows an eternal threephase resistor to be connected to ...
... slotted ferromagnetic material, but the rotor winding may be either the squirrel-cage type or the wound-rotor type. The latter is of a form similar to that of the stator winding. The winding terminals are brought out to three slip rings. This allows an eternal threephase resistor to be connected to ...
Current transformer selection guide
... The calibrating CTs are calculated to re-establish currents and phases to match the coupling to the power transformer. In the somewhat infrequent case in which it is not possible to use a calibration CT (as the accuracy power is too high), the rated current depends on the transformer coupling. Deter ...
... The calibrating CTs are calculated to re-establish currents and phases to match the coupling to the power transformer. In the somewhat infrequent case in which it is not possible to use a calibration CT (as the accuracy power is too high), the rated current depends on the transformer coupling. Deter ...
ieee apec electrical paper - Allen
... causing chemical changes within the lubricant. A recent investigation was conducted by Chen, et al., on this EDM phenomenon [5]. Recently, the authors presented their findings on EDM and its relationship to PWM inverter operation [6,7]. The authors suggested the sources for Rotor Shaft to Ground Vol ...
... causing chemical changes within the lubricant. A recent investigation was conducted by Chen, et al., on this EDM phenomenon [5]. Recently, the authors presented their findings on EDM and its relationship to PWM inverter operation [6,7]. The authors suggested the sources for Rotor Shaft to Ground Vol ...
15170 Elec Motors
... B. For motors below 1/2 HP, which will be 120V 1-phase, split phase, capacitor or shaded pole type. All C. ...
... B. For motors below 1/2 HP, which will be 120V 1-phase, split phase, capacitor or shaded pole type. All C. ...
Efficiency evaluation of interior permanent magnet synchronous
... machines is addressed. A challenge facing electrical machine manufacturers and users is the assessment of efficiency, particularly for larger machines and verticallymounted machines and also linear machines, both large and small. During operation, an electrical machine is heated as a consequence of ...
... machines is addressed. A challenge facing electrical machine manufacturers and users is the assessment of efficiency, particularly for larger machines and verticallymounted machines and also linear machines, both large and small. During operation, an electrical machine is heated as a consequence of ...
AC Generators - Nuclear Community
... magnetic field produced by an electromagnet. The two ends of the loop connect to slip rings. The slip rings are in contact with two brushes. When the loop rotates, it cuts magnetic lines of force, first in one direction, and then the other. As the conductor passes through the magnetic field, the mag ...
... magnetic field produced by an electromagnet. The two ends of the loop connect to slip rings. The slip rings are in contact with two brushes. When the loop rotates, it cuts magnetic lines of force, first in one direction, and then the other. As the conductor passes through the magnetic field, the mag ...
- UTas ePrints - University of Tasmania
... aspects of the health and safe operation of electric direct-current machines are considered. The discussion starts with consideration of several types of faults as summarised below. Due to the nature of the commutation process in d-c machines, the transfer of energy (electrical to mechanical and vic ...
... aspects of the health and safe operation of electric direct-current machines are considered. The discussion starts with consideration of several types of faults as summarised below. Due to the nature of the commutation process in d-c machines, the transfer of energy (electrical to mechanical and vic ...
ENERGY SAVINGS AND OPERATION
... the second 9s time interval where one of the two motors lost contact with the load and therefore operated uncharged, while the other motor bore the whole load. The maximum duration of this state, defined by the step of the main gear teeth and the speed of the load, was calculated to be 0.15s. Therea ...
... the second 9s time interval where one of the two motors lost contact with the load and therefore operated uncharged, while the other motor bore the whole load. The maximum duration of this state, defined by the step of the main gear teeth and the speed of the load, was calculated to be 0.15s. Therea ...
Power Factor and Generators
... TLO 1 – Describe the construction, operating characteristics, and limitations for an AC generator. 1.1 Describe the theory of operation of an AC generator. 1.2 State the purpose of the following components of an AC generator: Field, Armature, Prime mover, Rotor, Stator, and Slip rings. 1.3 Define th ...
... TLO 1 – Describe the construction, operating characteristics, and limitations for an AC generator. 1.1 Describe the theory of operation of an AC generator. 1.2 State the purpose of the following components of an AC generator: Field, Armature, Prime mover, Rotor, Stator, and Slip rings. 1.3 Define th ...
Brushless PM machines are constructed with the electric winding on
... a permanent magnet rotor. It is a relatively low speed, low torque device with large step angles of either 45 or 90 degrees. It's simple construction and low cost make it an ideal choice for non industrial applications, such as a line printer print wheel positioner. The permanent-magnet stepper moto ...
... a permanent magnet rotor. It is a relatively low speed, low torque device with large step angles of either 45 or 90 degrees. It's simple construction and low cost make it an ideal choice for non industrial applications, such as a line printer print wheel positioner. The permanent-magnet stepper moto ...
Motion for Dummies
... types of anisotropy are: (a) crystal, (b) stress, (3) shape, and (d) exchange. To learn more about them please refer to a technical text. If the material has a high flux density and a strong internal force it can influence other domains. However, domains on the periphery of the magnet volume have fe ...
... types of anisotropy are: (a) crystal, (b) stress, (3) shape, and (d) exchange. To learn more about them please refer to a technical text. If the material has a high flux density and a strong internal force it can influence other domains. However, domains on the periphery of the magnet volume have fe ...
AC Induction Motor Data
... laminations mirroring the stator laminations. The rotor windings are made up of rotor bars passed through the rotor, from one end to the other, around the surface of the rotor. The bars protrude beyond the rotor and are connected together by a shorting ring at each end. The bars are usually made of ...
... laminations mirroring the stator laminations. The rotor windings are made up of rotor bars passed through the rotor, from one end to the other, around the surface of the rotor. The bars protrude beyond the rotor and are connected together by a shorting ring at each end. The bars are usually made of ...
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.