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Questions and Answers
What is the primary concern when applying -Vdc/2 to the converter during the fall time?
What is the primary concern when applying -Vdc/2 to the converter during the fall time?
- To reduce the converter's voltage
- To avoid negative torque generation (correct)
- To increase the converter's efficiency
- To generate negative torque
What is the expression for the output torque of a synchronous reluctance machine?
What is the expression for the output torque of a synchronous reluctance machine?
- Te = (Ld + Lq)Is sin 2δ
- Te = (Ld - Lq)Is2 cos 2δ
- Te = (Ld - Lq)Is2 sin 2δ (correct)
- Te = (Ld + Lq)Is2 sin δ
What is the main difference between an interior permanent magnet synchronous machine and a synchronous reluctance machine?
What is the main difference between an interior permanent magnet synchronous machine and a synchronous reluctance machine?
- The type of torque components
- The speed of operation
- The presence of magnets in the rotor cavity (correct)
- The direction of the d-axis
What is the characteristic of the rotor of a synchronous reluctance motor?
What is the characteristic of the rotor of a synchronous reluctance motor?
What is the purpose of d-axis excitation in a synchronous reluctance machine?
What is the purpose of d-axis excitation in a synchronous reluctance machine?
What is the advantage of synchronous reluctance machines in high-speed applications?
What is the advantage of synchronous reluctance machines in high-speed applications?
What is the direction of the excitation in a synchronous reluctance machine?
What is the direction of the excitation in a synchronous reluctance machine?
What is the characteristic of the inductance in a synchronous reluctance machine?
What is the characteristic of the inductance in a synchronous reluctance machine?
What is the type of torque generated by a synchronous reluctance machine?
What is the type of torque generated by a synchronous reluctance machine?
What is the advantage of using a synchronous reluctance machine instead of an interior permanent magnet synchronous machine?
What is the advantage of using a synchronous reluctance machine instead of an interior permanent magnet synchronous machine?
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Study Notes
Permanent Magnet Assisted Synchronous Reluctance Machine
- Induced voltage by rotor magnets opposes the voltage drop across the q-axis inductance, improving the power factor.
- The machine has Ld > Lq and the output torque can be maximized at a torque angle of 45°.
Synchronous Reluctance Motor
- Terminal voltage can be represented by V = RI + jX d I d + jX q I q.
- The machine operates at low power factor (PF = cos Φ), requiring a larger inverter compared to the induction machine.
Power Factor Improvement
- Adding permanent magnets in the rotor q axis can improve the power factor of the synchronous reluctance machine.
SRM Drive System
- The current fall time is longer than the classical converter, as only -Vdc/2 is applied through this period.
- To avoid negative torque generation, the phases current should go down to zero before dL/dθ becomes negative.
Synchronous Reluctance Machines
- The machine can still operate with the reluctance torque when the magnets are removed from the rotor cavity.
- The output torque can be represented by Te = Tr = (Ld - Lq)Is^2 sin 2δ.
Characteristics
- The rotor is very robust, containing no magnets or copper, making it suitable for high speed applications.
- High inductance is present on the d-axis.
Examples
- 4-pole synchronous reluctance motor.
- ABB synchronous reluctance motor.
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