A Novel Universal Sensor Concept for Survivable PMSM Drives Yao
... Another type of position sensorless technique is based on an electric machine’s back electromotive force (EMF) [8], [9]. The position vector can be estimated by integration of the back EMF. However, phase back EMF is usually not achievable in a machine drive system, because phase voltage is also aff ...
... Another type of position sensorless technique is based on an electric machine’s back electromotive force (EMF) [8], [9]. The position vector can be estimated by integration of the back EMF. However, phase back EMF is usually not achievable in a machine drive system, because phase voltage is also aff ...
Rotor angle error correction
... measurement of the rotor angle can be split between time-varying (gaining error between resolver signals) and time-constant (misalignment of the rotor’s zero position against the angle sensor). Time-varying errors cause a torque ripple that results in increasing noise, less comfort and lower efficie ...
... measurement of the rotor angle can be split between time-varying (gaining error between resolver signals) and time-constant (misalignment of the rotor’s zero position against the angle sensor). Time-varying errors cause a torque ripple that results in increasing noise, less comfort and lower efficie ...
practical File
... The speed of the DC motor is inversely propositional to the flux per pole, when the armature voltage is kept constant. By decreasing the flux the speed can be increased and vice – versa. Hence the main flux of field control method the flux of a DC motor can be changed by changing field current with ...
... The speed of the DC motor is inversely propositional to the flux per pole, when the armature voltage is kept constant. By decreasing the flux the speed can be increased and vice – versa. Hence the main flux of field control method the flux of a DC motor can be changed by changing field current with ...
DC Machines
... Commutator: is a mechanical rectifier, which converts the alternating voltage generated in the armature winding into direct voltage across the brush. It is made of copper segments insulated from each other by mica and mounted on the shaft of the machine. The armature windings are connected to the co ...
... Commutator: is a mechanical rectifier, which converts the alternating voltage generated in the armature winding into direct voltage across the brush. It is made of copper segments insulated from each other by mica and mounted on the shaft of the machine. The armature windings are connected to the co ...
AC GENERATOR COMPONENTS
... Slip rings are electrical connections that are used to transfer power to and from the rotor of an AC generator (refer to Figure 1). The slip ring consists of a circular conducting material that is connected to the rotor windings and insulated from the shaft. Brushes ride on the slip ring as the roto ...
... Slip rings are electrical connections that are used to transfer power to and from the rotor of an AC generator (refer to Figure 1). The slip ring consists of a circular conducting material that is connected to the rotor windings and insulated from the shaft. Brushes ride on the slip ring as the roto ...
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 ...
DC Motors - ReshimNa5.ru
... At the most basic level, electric motors exist to convert electrical energy into mechanical energy. This is done by way of two interacting magnetic fields -- one stationary, and another attached to a part that can move. A number of types of electric motors exist, but most BEAMbots use DC motors1 in ...
... At the most basic level, electric motors exist to convert electrical energy into mechanical energy. This is done by way of two interacting magnetic fields -- one stationary, and another attached to a part that can move. A number of types of electric motors exist, but most BEAMbots use DC motors1 in ...
Performing locked rotor test on squirrel cage motors
... A locked rotor or short-circuit test (LRT) performed on squirrel cage motors is part of the routine test series for such motors. The test is to confirm motor compliance with standard and customer requirements. This article presents basics about estimation methods of parameters to be evaluated when a ...
... A locked rotor or short-circuit test (LRT) performed on squirrel cage motors is part of the routine test series for such motors. The test is to confirm motor compliance with standard and customer requirements. This article presents basics about estimation methods of parameters to be evaluated when a ...
8. Induction motor
... Three phase Induction Motor: A machine that converts 3-phase a.c. electrical power into mechanical power by using an electromagnetic induction phenomenon is called as three phase induction motor. The 3-phase IM are usually built in small size. They are most commonly used a.c. motor used in the indus ...
... Three phase Induction Motor: A machine that converts 3-phase a.c. electrical power into mechanical power by using an electromagnetic induction phenomenon is called as three phase induction motor. The 3-phase IM are usually built in small size. They are most commonly used a.c. motor used in the indus ...
Basics on electric motors
... the load on DC motor (e.g. attach something difficult to push to its rotor), the motor will slow down but will eventually reach some equilibrium where its torque has increased sufficiently to continue pushing the load around. In contrast, an AC motor, if overloaded, will just stop. DC motors are the ...
... the load on DC motor (e.g. attach something difficult to push to its rotor), the motor will slow down but will eventually reach some equilibrium where its torque has increased sufficiently to continue pushing the load around. In contrast, an AC motor, if overloaded, will just stop. DC motors are the ...
R a
... generators and torque in motors reduces with it. This is particularly objectionable in steel rolling mills that require sudden torque increase. •Compensating windings put on pole faces can effectively negate the effect of AR. These windings are connected in series with armature winding. ...
... generators and torque in motors reduces with it. This is particularly objectionable in steel rolling mills that require sudden torque increase. •Compensating windings put on pole faces can effectively negate the effect of AR. These windings are connected in series with armature winding. ...
SBO
... numbers of pins. The receptacle is mainly designed inside the PCB thickness to have a low profile connector. ...
... numbers of pins. The receptacle is mainly designed inside the PCB thickness to have a low profile connector. ...
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.