Torque Characteristics in .NET framework

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Torque Characteristics
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When a load is applied to any (but here specifically a shunt) motor, it will tend to slow down and, in turn, reduce the counter emf produced
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The increase in armature current results in an increase in torque to take care of the added load Basically, constant, counter emf tends to remain constant over a wide range of armature current values, and produces a fixed speed curve that only droops slightly at high armature currents The shunt motor s linear torque and fixed speed versus armature current characteristics have two undesirable side effects for traction applications when controlled manually First, when a heavy load (hill climbing, extended acceleration) is applied, a shunt motor does not slow down appreciably as does a series motor, and the excessive current drawn through its armature by the continuous high torque requirement makes it more susceptible to damage by overheating Next, in contrast to the knee bend in the series motor torque-speed equations (Figure 5-9), shunt motor torque-speed curves are nearly straight lines This means more speed control or shifting is necessary to achieve any given operating point Series motors are therefore used where there is a wide variation in both torque and speed and/or heavy starting loads Other than having much lower startup torque, shunt motors can perform as well as series motors in EVs when electronically controlled The downside is that a shunt motor controller can be more complicated to design than a series motor controller You can also achieve a higher-than-rated shunt motor speed by reducing the shunt coil current in this case, you place an external control resistance in series with the shunt motor field winding But here, unlike the series motor s runaway rpm region at no load, you are playing with fire, because the loaded shunt motor armature has an inertia that does not permit it to respond instantly to field control changes If you do this while your shunt motor is accelerating, you might cook your motor or have motor parts all over the highway by the time you adjust the resistance back down to where you started Be careful with field weakening in shunt motors Again, these motors soon lost favor due to the inherent simplicity of a series DC motor arrangement Heating was less of an issue, and certainly not something that drivers want to have to worry about; the series motor was better suited to the application A shunt motor is instantly adaptable as a shunt generator Most generators are in fact shunt wound, or variations on this theme The linear or nearly linear torque and speed versus current characteristics of the shunt motor manifest as nearly linear voltage versus current characteristics when used as a generator This also translates to a high degree of stability that makes a shunt motor both useful for and adaptable to regenerative braking applications, either manually or electronically controlled
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Current flows through the field in a shunt motor in the same direction as it flows through the armature, so reversing the applied voltage polarity reverses both the direction of the current in the armature and the direction of the field-generated flux, and does not reverse the motor rotation direction To reverse motor direction, you have to reverse or transpose the direction of the shunt field winding with respect to the armature
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A shunt motor is instantly adaptable as a shunt generator Most generators are in fact shunt wound, or variations on this theme The linear or nearly linear torque and speed versus current characteristics of the shunt motor manifest as nearly linear voltage versus current characteristics when used as a generator This also translates to a high degree of stability that makes a shunt motor both useful for and adaptable to regenerative braking applications either manually or electronically controlled
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