Table of Contents
What is basic principle of motor?
Principle: An electric motor (dc motor) works on the principle that when an electric current is passed through a conductor placed normally in a magnetic field. a force acts on the conductor as a result of which the conductor begins to move and mechanical energy is obtained.
Why HT motor takes low current?
1. In star, phase current is same as line current. But phase voltage is 1/1.732 times line Voltage. So insulation required in case of HT motor is less.
Why do we use HT motors?
HT motors take high voltage the increase in voltage leads to decrease in current which thereby leads to decreases in size of conductor. Thus the size of the cables and distribution line reduces.
How many types of HT motors are there?
HT Motor – Motors which work on 3.3 KV, 6.6 KV and 11 KV. LT Motor – Motors which work on 230 V & 415 V. HT Motor – Motors which work on 6.6 KV & 11 KV. Medium Voltage Motor – Motors which work on 690 V & 3.3 KV.
What is motor and operation?
An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor’s magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor’s shaft.
What is HT motor protection?
The common motor protection provided for HT and LT motors are: Short Circuit Protection (50) Locked Rotor Protection or Blocked Rotor Protection (14) Over Load Protection (49)
What is difference between HT motor and LT motor?
HT Motor – Motors which work on 3.3 KV, 6.6 KV and 11 KV. LT Motor – Motors which work on 230 V & 415 V. HT Motor – Motors which work on 6.6 KV & 11 KV. Ramdevs Motors is leading manufacturer and supplier of LT motors in India.
What is long shunt and short shunt?
Short Shunt compound dc generator is in which only shunt field winding is in parallel with the armature winding. Long Shunt compound dc generator is in which shunt field winding is in parallel with both series field and armature winding.
What is the range of HT voltage?
In automotive engineering, high voltage is defined as voltage in range 30 to 1000 VAC or 60 to 1500 VDC. The definition of extra-high voltage (EHV) again depends on context. In electric power transmission engineering, EHV is classified as voltages in the range of 345,000– 765,000 V.
What is HT conductor?
HT lines The Conductors used to transmit Electricity from Sub-stations to Distribution Transformer ( Double Pole Structure ) are known as HT Lines. HT Lines are erected only at main roads of Cities or villages.
What is MP relay?
The MP-1 relay module is a multi-purpose electrical device, designed to be used in low-voltage electrical installations, including security alarm systems. The control function is implemented by using voltage signals which are fed to the control inputs to make or break the relay contacts.
How does a motor rotate?
Large AC motors (used in things like factory machines) work in a slightly different way: they pass alternating current through opposing pairs of magnets to create a rotating magnetic field, which “induces” (creates) a magnetic field in the motor’s rotor, causing it to spin around.
What is a hysteresis motor?
Hysteresis motor is defined as a synchronous motor that is having cylindrical rotor and works on hysteresis losses induced in the rotor of hardened steel with high retentivity. It is a single phase motor and its rotor is made of ferromagnetic material with non magnetic support over the shaft.
What is the working principle of electric motor?
All of these motors work with more or less the same principle. Working of electric motor mainly depends upon the interaction of magnetic field with current.
How does retentivity affect the hysteresis torque of a synchronous motor?
Again higher the retentivity, higher is the hysteresis torque and the hysteresis torque is independent of the rotor speed always. The high retentivity enables the continuous magnetic locking between stator and rotor and thus the motor rotates at synchronous speed.
What is hysteresis torque?
We know that constant Hysteresis Torque occurs in the hysteresis motor. This constant valued torque allows the motor to synchronize any load it can accelerate. The normal operating range is mentioned with dark vertical line.