The description text you have provided, points towards the type of 1 Phase Induction Motor I was referring to (the type which should not have low speed control methods applied, due to start switch engaging).
There is something written in the front of motor :
From the description, the Motor sounds like this:
Split Phase Start"
SPLIT PHASE START SINGLE PHASE INDUCTION MOTOR
refers to this Motor having an Auxiliary "Start" Winding, used to - of course - Start the Motor.
It is needed to Start the Motor's Rotor from a dead Stop (or turning less RPMs than apx. 80% of the rated speed...more on this to follow).
The "Split Phase" is an additional Motor Winding, which is designed:
[*] At an "Offset" - in "X" number of degrees (like 20Â° to 60Â°) from the "Relative Polarity" of the Main "Run" Winding, in order to reduce the stationary Field of the Main Winding,
[*] The Winding arrangements resemble an Open Delta Polyphase connection scheme - where one of the Windings; the "Start" Winding, is controlled by a Normally Closed Centrifugal Switch,
[*] The Auxiliary "Start" Winding will have a lower Resistance/Reactance value than the Main "Run" Winding.
The term "Single Phase Induction Motor"
refers to the design characteristics being a 1Ã˜ Motor (not a Polyphase Motor - like 2 or 3 Phase), and it is an "Induction-type" Motor - AKA "Squirrel Cage Rotor" type Motor.
This Motor does not have a Wound Rotor (akin to the Armature of a DC Motor), and no input current flows DIRECTLY
through the Rotor.
Current is Induced
into the Rotor by introducing AC Power to the Stator Windings ("Stator Windings" are akin to the Field Windings of a DC motor).
These Motors function more similar to how a Transformer does, than how the typical DC Motor functions.
1Ã˜ Induction Motors (with exception to a few special types) require a method of getting the rotor to spin from either a dead stop (AKA "Locked Rotor"), or to bring it upto "Near Synchronous Speed".
Polyphase (2Ã˜, 3Ã˜) Motors do not require auxiliary start methods, they have "self-starting" abilities.
This is due to the fact that the magnetic fields developed at the Stator Windings, are "Rotating", and therefore will reduce the field level of an adjacent Winding - causing the Rotor to rotate according to this "Imbalance".
"1/3 HP" = one-third Horsepower; this is a "Fractional Horsepower" Motor.
"(0.25 kW)" = True Power rating for full load scenario. This is a 250 Watt (or 0.25 kiloWatt) rating.
"4 Pole" = there are two separate Stator Winding pairs, which will result in a Rotor Speed of 1/2 the Synchronous Frequency (not including the "Slip").
If the Synchronous Frequency of the AC Power System is 60 Hz, the equivalent RPMs (Revolutions Per Minute) would be:
(60 Hz Ã— 60 Seconds = 3,600 RPMs)
The "Unloaded" speed of a 2-Pole Induction Motor connected to 60 Hz is 3,600 RPMs.
As the Motor is loaded down (doing work), the rotor's speed "Slips" behind the Synchronous Frequency, until the maximum power is exceeded - then it stalls.
Typical Full-Load speed of a 2-Pole Motor is 3,450 RPMs.
Your Motor has 2 sets of "Pole Pairs", and is known as a 4-Pole Motor.
This, in effect, results in a speed, which is a fraction of the Synchronous Frequency (in this case - 1/2, or 50% Sync. Hz).
The "Unloaded" speed is 1,800 RPMs at 60 Hz, with a full-load slip frequency speed of 1,725 RPMs at 60 Hz (typ.).
HZ 50 50 60
V 220 230 220
A 2.4 2.5 2.2
"HZ 50 50 60":
This refers to the AC Power System(s) Synchronous Frequency, which the Motor is designed to operate properly with.
There are two "50 Hz" ratings listed, and one "60 Hz" rating listed.
These are setup in a way to correspond with the Full-Load Amperes (FLA) VS System's Nominal Rated Voltage.
"V 220 230 220":
These are the Voltage Ratings per Hz.
"A 2.4 2.5 2.2":
These are the FLA ratings per System Voltage - which is also per System Hz.
This Motor may be used on a 50 Hz AC System - at Voltages of either 220 VAC or 230 VAC; or it may be used on a 60 Hz AC System - at a Voltage of 220 VAC.
Rotor Full-Load speed per Hz:
1420 = Speed at 50 Hz,
1720 = Speed at 60 Hz.
JIS C 4004 JP20 JC0
Typical Manufacturing data (the "Frame" type may be referenced in the NEC).
Motor is rated for continuous use (3 hours or more of full-load operation)
Insulation Class (winding Insulation) = "E"
Ambient Temperature rating = 30Â°C (temperature of surroundings during normal operation)
This should have the Motor's Serial Number following the word "Serial"
Per the application questions:
i want to control the speed n the torque of the motor, but i don't know how.
You could make this motor run at a higher speed (by increasing the frequency applied to it), but slowing it down will bring the start winding into operation.
Prolonged operation at lower than 80% synch. speeds, with a load applied, will damage the Motor's start winding.
This will result in a large volume of smoke leaking out of the Motor
The scheme is like this:
motor <--- driver(?) <--- AT89S52
That looks correct.
The "Driver" would be whatever amplification device you plan to use. Bring the AC Power into the "Driver" section, then run your Controller (Pspice / Pbasic stamps???) from a transformer tapped off the supply.
You could use this setup on this Motor for a simple Start-Stop operation, just not any speed control.
It may also be incorporated with other basic functions - such as "Forward/Reverse" control (requires leads to motor windings run from "Driver" section), or "Dynamic Braking" in either direction (or combine them all).
If you can obtain a Shaded Pole, Permanent Split Capacitor (PSC), or "Universal" (Brush/Commutator-Armature) type Motor, then you may apply Speed Control + directional + braking control to the Motor (with exeption to the shaded pole type - directional is fixed via shading pole, plus braking may not be functional).
i don't know much about this motor. my teacher just gave me it, n want me to learn about it. he can't help me, coz he don't know much either...(shame on him) so, i'm trying to ask everyone who know more about the motor.
Sorry to hear this about your instructor, but hopefully we can assist you to understand the basic operations and constraints of the AC Induction Motor.
BTW, check out the Technical Reference section for Schematics of AC Induction Motors.
Do a search in the "Menu", search the links, or let us know if you cannot find the drawings, and I will post links.