Direct Torque Control with Space Vector Modulation (DTC-SVM) of ...
Direct Torque Control with Space Vector Modulation (DTC-SVM) of ...
Direct Torque Control with Space Vector Modulation (DTC-SVM) of ...
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Sensorless Speed <strong>Direct</strong> <strong>Torque</strong> <strong>Control</strong> <strong>with</strong> <strong>Space</strong> <strong>Vector</strong> <strong>Modulation</strong> (<strong>DTC</strong>-<strong>SVM</strong>)<br />
Chapter 6<br />
DIRECT TORQUE CONTROL WITH SPACE VECTOR MODULATION (<strong>DTC</strong>-<br />
<strong>SVM</strong>) OF PMSM DRIVE WITHOUT MOTION SENSOR<br />
6.1 Introduction<br />
Many motion control applications, such as material handling, packaging and hydraulic<br />
or pneumatic cylinder replacement, require the use <strong>of</strong> a position transducer for speed or<br />
position feedback, such as an encoder or resolver. In addition, permanent magnet<br />
synchronous motors require position feedback to perform commutation. Some <strong>of</strong><br />
systems utilize velocity transducer as well. These sensor add cost, weight, and reduce<br />
the reliability <strong>of</strong> the system. Also, a special mechanical arrangement needs to be made<br />
for mounting the position sensors. An extra signal wires are required from the sensor to<br />
the controller. Additionally, some type <strong>of</strong> position sensors are temperature sensitive and<br />
their accuracy degrades, when the system temperature exceed the limits. Therefore, the<br />
research in the area <strong>of</strong> sensorless speed control <strong>of</strong> PMSM is beneficial because <strong>of</strong> the<br />
elimination <strong>of</strong> the feedback wiring, reduced cost, and improved reliability.<br />
Sensorless speed <strong>DTC</strong>-<strong>SVM</strong> control block scheme is presented in Fig. 6.1.<br />
Figure 6.1. Block scheme <strong>of</strong> <strong>DTC</strong>-<strong>SVM</strong> for PMSM drive <strong>with</strong>out motion sensor.<br />
As we can see the operation <strong>of</strong> speed controlled PMSM drive <strong>with</strong>out mechanical<br />
motion sensor is based only on measurement <strong>of</strong> following signals, which are available<br />
in every PWM inverter-fed drive system as:<br />
• DC link voltage,<br />
• motor phase currents,<br />
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