[1] What is Switched Reluctance Motor?
The switched reluctance motor is a double salient, singly excited motor. This means that it has salient pole on the rotor and the stator, but only one member carries windings. The rotor has no windings, magnets or cage windings. It works on variable reluctance principle.
[2] What are the two types of control techniques in SRM?
[3] What is meant by energy ratio?
Energy ratio = Wm/[Wm + R] = 0.455
Wm = mechanical energy transformed
This energy ratio cannot be called as efficiency. As the stored energy R is not wasted as a loss but it is fed back to the source through feedback diodes.
[4] What is phase wingdings?
Stator poles carrying field coils. The field coils of opposite poles are connected in series such that mmfs are additive and they are called phase wingdings of SRM
[5] What are the major difference between SRM and stepper motor?
[6] What is hysteresis current control?
This type of current controller maintains a more or less constant current throughout the conduction period in each phase. This controller is called hysteresis type controller.
[7] When do you go for chopping mode of control in switched reluctance motor?
The chopping mode of control in SRM is applied only low-speed. Here each phase winding gets excited for a period which is sufficiently long.
[8] What is the working principle of Switching Reluctance Motor?
The switched reluctance motor basic principle is based on Faraday’s law of electro magnetic interaction.
[9] Why rotor position sensor is essential for the operation of Switched Reluctance Motor?
It is normally necessary to use a rotor position sensor for commutation and speed feed back. The turning ON and OFF operation of the various devices of power semiconductor switching circuit are influenced by signals obtained from rotor position sensor.
[10] List the disadvantages of a Switched Reluctance Motor?
[11] What are the advantages of switched reluctance motor?
[12] Whar are the applications of SRM?
[13] What is the difference between Synchronous Reluctance Motor and PM Synchronous Motor?
[14] What are the differences between PMBLDC and PMSM?
[15] Distinguish between self-control and vector control of PMSM
[16] What is meant by slotless motor?
In slotless motor, the stator teeth are removed and resulting space is partially filled with addition of copper
[17] State the advantages of PMSM?
[18] What are the advantages and disadvantages of PMSM?
Advantages
Disadvantages
[19] Write the EMF equation of PMSM
Eph = 4.44 f. Φm. Kp. Kb. Nph volts
This is the RMS value of induced EMF per phase
where
f – frequency in Hz
Nph – Turns per phase
Φm – Flux per pole
Kw – Winding factor
[20] What are the assumptions made in derivation of EMF equation for PMSM?
[21] Why PMSM operating in self-controlled mode is known as Commutatorless DC Motor?
Load side controller performs somewhat similar function as commutator in a DC machine. The load side converter and synchronous motor combination functions similar to a DC machine.
First it is fed from a DC supply and secondly like a DC machine. The stator and rotor field remain stationary with respect to each other at all speeds. Consequently, the drive consisting of load side converter and synchronous motor is known as commutator less DC motor.
[22] What is Pulse Mode?
[23] What is Load Commutation?
Commutation of thyristors by induced voltages of load is known as Load Commutation. Here, frequency of operation is higher and it does not require commutation circuits.
[24] What is meant by self-control?
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