Answer / baikunth

generally there are two types of speed control systems are
available in induction motor. 1. scalar or VVVF and 2.
Vector or position control.In scalar control method we use
normal drives or cyclo-converters to control the voltage and
frequency for speed variation. but in vector mode we take
the feedback of position of the rotor and accordingly we
fire the device.It is the most complex technology and is
used only for precision speed control systems.

Answer / paddu241

frequency control

Answer / g senthilkumaran

Using scalar control, also called "volts per hertz" control
or v/f control, a drive essentially acts as a power supply
of a selected frequency and proportional voltage. At a
given speed, the motor performs much as it would when
supplied by utility power. For each frequency setting,
motor operation is governed by a torque Vs speed curve that
is similar to the torque Vs speed curve that governs
utility power operation.

Why the transmision line are 11,33,63,132kv?

10 Answers   Power Grid,

---

WHAT IS MEANT BY vfd(VARIABLE FREQUENCY DRIVE )HOW CAN WE APPLY VFD TO MOTOR ? I WANT FULL DETAIL IF ANYBODY KNOW THE WEBSITE FOR THAT PLZ SEND .THANK U

2 Answers  

---

What is the minimum permissive IR value for LT & HT motor for safe starting?

1 Answers   Rukmani,

---

what is different between grounding and earthings?

4 Answers  

---

What is the difference between earth and neutral

3 Answers  

---

---

what is resonance in electrical circuit and its effect? where we get high resonance and low resonance?

1 Answers  

---

Explain the construction of the conservator, operation and purpose, and draw the diagram of the conservator.

0 Answers   Siemens,

---

What is earth system using on the floater TN-S or TT. Iam not sure and what ICCP

0 Answers  

---

Witch do depand of Power factor and theory of power factor?

0 Answers  

---

What is the difference between reciprocating & rotary motors in AC units, which is the best one in terms of operation.

2 Answers   MacLellan,

---

How to reduce power factor correction capacitors failure in an industrial environment with vsd and computers usage in the system

2 Answers   ABB,

---

What is the pro & con of having 11kv & 33kv incoming, and what is the adv & disadv. of converting from 11kv to 33kv.

0 Answers  

---