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DC machine speed/torque characteristic | Physics Forums
22/06/2014· DC machine speed/torque characteristic Thread starter ilconformista; Start date Jun 21, 2014; Jun 21, 2014 #1 ilconformista. 18 0. Hello everyone! In the following speedtorque characteristic of a DC shunt motor, we see that if the speed exceeds a certain value, then the machine becomes a generator. I don''t understand something. How is it possible for the machine to have a negative torque
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Figure 1 Torquespeed characteristic curve of a threephase induction motor generator If the rotor speed is less than the synchronous speed (NS), the machine acts as a motor; it delivers torque to a load. The number of torque changes based on a given speed of the load. The only part of the curve, which is almost linear, is good for operation.
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18/11/2015· Typically, the pullout torque is about 200 to 250 percent of the rated fullload torque of the machine. The starting torque (at zero speed) is about 150 percent of the fullload torque. Comments on the Induction Motor TorqueSpeed Curve 1.
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TorqueSlip and TorqueSpeed Characteristics. The Torqueslip curve of an induction motor shows the variation of torque with the slip. We have. If R 2 and X 20 are kept constant, then the torque τ will depend upon the slip s. The torqueslip characteristic curve is divided into three regions:
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The DC Motor has a linear torquespeed characteristic, and power peaks at about half the maximum RPM. The Shunt Motor also has a linear torquespeed characteristic and similarlyshaped power curve. In practice a shunt motor cannot run at its peak power or torque as the currents involved are too large.
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DC Motor Speed Characteristics. When a load torque is applied to a motor, the motor will slow down due to the load opposing the machine''s rotation. Eventually, the machine''s electromagnetic torque will equal the load torque and a new steadystate speed will be reached. How the speed changes depends on the type of field connections.
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ThreePhase Induction Motor TorqueSpeed Characteristics. Want create site? Find Free WordPress Themes and plugins. Similar to other types of electric machines, a threephase induction machine can work as a generator and as a motor. For this machine, however, because the stator must be connected to the threephase circuit, the difference between being a motor or functioning as a generator lies
learn moreTorque Slip Characteristics of Induction Motor | Electrical4U
11/07/2019· Torque Slip Characteristics of Three Phase Induction Motor The torque slip curve for an induction motor gives us the information about the variation of torque with the slip. The slip is defined as the ratio of difference of synchronous speed and actual
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The speedtorque curves for a smooth variation of armature voltage are shown in Fig. They move along the Yaxis (speed axis) following changes in the armature voltage. The field winding of the motor is supplied from a separate source. The smooth variation of armature voltage brings about speed control in the zero to base speed range very efficiently. The motor operates in a constant
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Figure 1 showed a plot of induction motor torque vs speed from zero to synchronous speed. This curve is called the torquespeed characteristic curve. We can derive an equation from the equivalent circuit that allows the calculation of the torque for a given value of slip. FIGURE 1 Induction motor torquespeed characteristic curves.
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29/09/2019· As the torque induced (T ind) is proportionate to the product of the rotor field, net field, and power factor. The torquespeed characteristic of an induction motor is shown in the figure. Regions of TorqueSpeed Characteristic Curve of Induction Motor This representative curve can be separated into 3 areas.
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Torquespeed characteristics of the induction machine. Torquespeed characteristics of the induction machine. This is a Java Applet created using GeoGebra from geogebrait looks like you don t have Java installed please go to . Chat Online; Torque Speed Characteristics of Synchronous Motor. Oct 07 2017 · The Torque Speed Characteristics of Synchronous Motor is shown in Fig. The
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At N = 0, the starting condition, motor produces a torque called starting torque. For low slip region, speeds near the region is stable and the characteristics is straight in nature. Fall in speed from no load to full load is about 4 to 6 %. The characteristics is shown in the
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In addition, the influences of some physical parameters on the torque/powerspeed characteristic are investigated, including split ratio, number of stator/rotor slots per pole per phase, length of airgap, number of pole pairs and stator/rotor slot area, etc.
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SpeedTorque Characteristics of Machines or Mechanisms: The speedtorque characteristic of a machine or mechanism given by the relation ω = f(T L) is defined as the relationship between the speed at which it is operated and the resisting or load torque it develops. Different kinds of mechanisms and machines exhibit different speedtorque characteristics. However, several general conclusions
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21/04/2018· Torque Slip Characteristics is the graphical relationship between the torque and slip of an Induction Machine. This characteristic is very useful for the stability analysis of the machine. This includes Motoring Mode, Generating Mode and Braking Mode for
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07/10/2017· The Torque Speed Characteristics of Synchronous Motor is shown in Fig. The characteristic is parallel to the torque axis since the motor is of constant speed type. The damper windings provided on the pole faces to suppress hunting may also be used to start the motor using the induction motor principle.
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04/10/2017· Typical Torque Speed Characteristics of Induction Motor when supplied from variable voltage at rated frequency are given in Fig. (a). They are based on the fact that the induction motor torque (at a given slip) varies as the square of the voltage. The slip for maximum torque is independent of voltage.
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And hence, speed is low which results in decreased back emf Eb. Due to decreased Eb, more armature current is allowed. Speed vs. torque (NTa) This characteristic is also called as mechanical characteristic. From the above two characteristics of DC series motor, it can be found that when speed is high, torque is low and vice versa.
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The torquespeed relation for the machine under the entire speed range is called the complete speedtorque characteristic. A typical curve is shown in Fig: for a fourpole machine, the synchronous speed being 1500 rpm. Note that negative speeds correspond to slip values greater than 1, and speeds greater than 1500 rpm correspond to negative slip. The plot also shows the operating modes of
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06/01/2016· The angular acceleration is given by the increase in speed divided by the time taken, Hence in order to meet both the steadystate and dynamic torque requirements, a drive capable of delivering a torque of 45 Nm (¼ 37 þ 8) at all speeds up to 1520 rev/min is required, as indicated in Figure
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23/01/2016· Torque Speed Characteristic is the curve plotted between the torque and the speed of the induction motor. As we have already discussed the torque of the induction motor in the topic Torque Equation of an Induction motor. The equation of the torque is given as shown below.
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Load test on dc shunt motor to draw speed – torque and horse power – efficiency characteristics. 2. Field Test on dc series machines. 3. Speed control of dc shunt motor by armature and field control. 4. Swinburne''s Test on dc motor. 5. Retardation test on dc shunt motor. 6. Regenerative test on dc shunt machines. 7. Load test on three phase induction
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30/09/2019· The torquespeed characteristic of this motor is drawn here. But in the given diagram the rotor that has a less crosssectional area bar located near the surface of the rotor. Due to the smaller areas of the bars, the value of the resistance will be larger.
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