• دوشنبه تا شنبه: 10:00 - 16:00 / یکشنبه تعطیل است

Electrical drives Interview Questions with Answers

In self-control synchronous motor drive, the load side converter is operated as an inverter and maximizes motor power factor. This control is called constant margin angle control. [7] Why a synchronous motor without damper winding is used, in the drive system employing a cycloconverter?

به خواندن ادامه دهید

Speed Control of Ship Electrical Motor Propulsion

A synchro-converter has a controlled rectifier termed as source/line side converter and inverter stages termed as load side converter which both rely on natural turn-off or line commutation for the thyristors by the three-phase a.c. voltages at either end of the converter. Figure 9 Synchronous Motor Drive employing a load commutated thyristor ...

به خواندن ادامه دهید

Cyclo-Converters - Principle,Applications

LCI Drive Controller • Line converter controls the dc-link current 15. Operation of variable frequency control of multiple synchronous motor drive A self-controlled synchronous motor drive employing a load commutated thyristor inverter is shown in Fig. In large power drives wound field synchronous motor is used.

به خواندن ادامه دهید

PM Synchronous Motor Drive - MathWorks

The PM Synchronous Motor Drive (AC6) block represents a classical vector control drive for permanent synchronous motors. This drive features a closed-loop speed control based on the vector control method. The speed control loop outputs the reference electromagnetic torque of the machine. The reference direct and quadrature (dq) components of ...

به خواندن ادامه دهید

(PDF) The use of electric motors for the propulsion of ...

The cyclo-converter changes the frequency of the current to the motor, which in the synchronous motor means that the rotation of the motor only depends on the number of poles like in the formula: Ns[r/min]=120x (frequency[HZ] / number of poles) The cycloconverter does the same at the induction motor, but in the induction motor there is a ...

به خواندن ادامه دهید

ECSTUFF4U for Electronics Engineer: Cycloconverter operation

A cyclo-converter is a one types of device that converts AC power at a certain frequency into AC power but lower frequency. The principle of cyclo-converter is described given below by using a single phase to single phase step-up converters and single phase to single phase step down converters.

به خواندن ادامه دهید

ABB

The torque rise time which can be reached with a motor supplied by 12-pulse convener is better than the respective value of a 6 pulse converter. Funhermore, with this amangement, the motor voltage can be increased to 3 kV, reducing cabling costs and energy losses. The …

به خواندن ادامه دهید

Home | Alpha College of Engineering and Technology

16.Draw the speed-torque curves of different motors on a common plot and explain the same. 17.Explain self controlled synchronous motor drive employing cyclo converter. 18.Explain separately excited DC drive controlled by chopper. 19.Explain self controlled synchronous motor drive employing close loop control. 20.Explain single phase dual ...

به خواندن ادامه دهید

Solid State Drives (EE2352) Scanned Lecture Notes - All ...

SYNCHRONOUS MOTOR DRIVES Separate Controlled mode (or) True Synchronous Mode: SELF – CONTROLLED MODE: SELF CONTROLLED SYN MOTOR DRIVE EMPLOYING LOAD COMMUTATED THYRISTOR INVERTER Voltage source inverter (VSI) fed syn Motor : 1) Square wave Inverter 2) PWM Inverter 3) Chopper with square wave Inverter VSI fed syn motor drive has 1. Reasonable ...

به خواندن ادامه دهید

Cycloconverter fed to Induction motor | Electric easy

A cyclo converter fed induction motor drive has following features: 1.The machine operates at its rated flux conditions due to voltage control is made in the converter itself. 2.A cyclo converter operates on line commutation, the losses occurred by forced commutation is eliminated. The converter operates at lag power factor and very poor line ...

به خواندن ادامه دهید

Synchronous Motor Drives | Electrical4U

But for synchronous motor drives only dynamic braking can be applied though plugging can be applied theoretically. Regenerative braking cannot be applied to them as they need higher speed than synchronous speed. Dynamic braking is done by disconnecting the motor from supply and connecting it across a three phase resistor.

به خواندن ادامه دهید

UNIT V SYNCHRONOUS MOTOR DRIVES

5.5 Self controlled synchronous motor Drive empolying load commuated Thyristor Inverter In fig wound field synchronous motor is used for large pow er drives.Permanent magnet synchronous motor is used for medium power drives. This drive consists of two converters.i.e source side converter and load side conve rter.

به خواندن ادامه دهید

Cycloconverter Drive for AC Motors

Cycloconverter Drive for AC Motors 571 AC DRIVES OVER DC DRIVES The dc drive fed with converter has attained a high technological standard. It is the most widely accepted solution, especially where slow-rotating high-capacity drives are concerned. With dc machines, the trend to ever higher unit ratings has in fact

به خواندن ادامه دهید

Self control of synchronous motor drives - SlideShare

1. 1 "self control of Synchronous Motor Drives employing cycloconverter". 2. Introduction Cycloconverters directly convert ac signals of one frequency (usually line frequency) to ac signals of variable frequency. These variable frequency ac signals can then be used to directly control the speed of ac motors. Thyristor -based cycloconverters ...

به خواندن ادامه دهید

Cycloconverter - an overview | ScienceDirect Topics

The stator of the motor is connected to 50-Hz supply, which is connected to the rotor and through a cycloconverter, and the motor drives a single-phase synchronous generator feeding to 16 2 3-Hz system [107, 108]. A static asynchronous intertie between two different systems of different frequency can be obtained by using two NCCs in tandem ...

به خواندن ادامه دهید

CLASSIFICATION OF SYNCHRONOUS MOTOR

SELF CONTROLLED SM DRIVE EMPLOYING LOAD ... •Again the line side converter is operated in conversion mode and the sequence is repeated. CYCLOCONVERTER FED SM (SELF CONTROL) 16. ... PERMANENT MAGNET SYNCHRONOUS MOTOR DRIVES EQUIVALENT CIRCUIT AND …

به خواندن ادامه دهید

Self control of synchronous motor drives - SlideShare

1. 1 "self control of Synchronous Motor Drives employing cycloconverter". 2. Introduction Cycloconverters directly convert ac signals of one frequency (usually line frequency) to ac signals of variable frequency. These variable frequency ac signals can then be used to directly control the speed of ac motors…

به خواندن ادامه دهید