Electric Motor
Coil wrapped around and unload the module is a module that has the scope to dismantle and re-roll the stator alternating current electric motor 1 phase and 3 phase induction motors.
This module consists of 4 learning activities. 1 is a revision of Planning and Preparing for Employment, Learning Activity 2 contains about unpacking coils on electrical equipment, Learning Activity 3 contains about assembling the coils on electrical equipment, while the fourth contains learning activities on the check and report the completion of the work.
By using this module in the training participants are expected to re-roll the stator of an induction motor 1 phase and 3 phase. To be able to do the learning module entitled "AND disassemble the coil wrapped around" should be training participants must have the ability to start, namely :
1. master the basic theories of alternating current electricity
2. master series / parallel load
3. control of magnetic circuit
4. master the principles of energy conversion
5. 3-phase power control circuit
6. skilled labor using hand tools on the work bench and montage work.
Plan and prepare for what type of motors that we will we dismantle or wrap. For this work we plan and prepare the type of induction motors single phase and three phase induction motors. We choose the type of motor is widely used type of industrial environment and usage in the community.
Theoretically a single phase induction motor can be distinguished into:
1. Split phase motors
2. Motor capacitors
3. Shade pole motor
4. And others.
While the three-phase induction motor (Three phase induction motor) is also called a poly-phase induction motor is an electric motor having a stator coil 3 pieces are mounted on the circumference of the stator is located shift 120o each electrical or mechanical. appropriate with his name, then this type of motor requires alternating voltage source three phase.
Construction of single phase induction motors and three phase induction motor consists of two main parts :
1. Stator In principle, the induction motor stator is equal to the synchronous motor starter and generator. There is a wire in the stator arrangement is entered into a groove for receiving the stator windings of the motor will take turns according to the type of motor single phase motors for example, the stator windings will carry a single phase, where the voltage is fed from one phase while the provider for the type three-phase motors, the stator will bring a three-phase winding is fed by three-phase voltage provider. The number of poles of the motor will determine the speed slow rotation of a motor. Greater the number of poles are installed then the slower the revolution generated when the number of poles, while the less the resulting spin faster and faster. This sort of thing can be calculated from:
Ns = synchronous round
F = Frequency meshes
P = Number of pole pairs
2. Rotor Rotor of an induction motor can be divided into two general categories :
a. Rotor Cage
In general, almost 90% of induction motor using a rotor with a lot of this kind. Because the rotor of this type, the induction motor is the simplest and most powerful type of rotor is made of silicon steel and consists of a cylindrical core that is parallelwith groove / slot and filled with copper or aluminum in the form of bars.
b. Rotor Winding
The rotor has a winding-wire entanglement is distributed so that the motor of this type also can be functioned as an alternator (generator) so this will have on the rotor poles in the stator winding of the internal rotor motor is connected in star (three phase) and terminal entanglement is removed and connected to three insulated slip ring that is placed on the motor shaft with a brush on it. The third brush is externally connected to a reostat to form stars. Reostat the motor serves to increase the torque of the motor asut during the investigation period. If the motor is working in normal conditions, the slip ring is automatically connected to short. So that the ring over the shaft connected together by a metal which further depressed the brush automatically lifted from the slip ring which serves to reduce friction losses. Besides these two main parts of induction motors also have additional konsturksi include home stator, stator cover, fan and terminal circuit.
Stator
In principle, the stator is part of the electric motor is not rotating at the stator besides that there are grooves that contain coils of wire.
Rotor In principle, the rotor is part of a rotating electric motor. Rotors on electric motor can be divided int, rotor winding and cage rotor
- When the number of poles plus it happens the rotor rotation produced will be reduced.
- When the number of poles on the motor is reduced so that rotation of the motor will occur increases.
- If the composition of silicon (carbon) plus, then what happens stator will be brittle and prone to rupture and the resulting value of the magnetic flux will increase.
picture 1
how to remove pulley
remove the stator and rotor
The stator coils form Form of an induction motor stator coil 1 phase can be divided into three types, this kind of thing is depending on how wrapped into the stator grooves. Coils form are as follows :
a. Coil loop or coil overlap (lap winding can also be called a spiral coil
b. Central spindle (concentric winding)
c. Spindle waves (wave winding
Function of the coil is as follows:
a. Snare coil (spiral) benyak used for motor (generator) with a relatively large capacity. Generally for middle and upper classes, although typically there is an electric machine with a larger capacity, use the system kosentris stator coil.
b. Center coils (concentric) in general the system is widely used for motor and generator with a small capacity. Although there are also special motors with small capacity using a coil with a special type.
c. Spindle waves / wave winding for the motor winding systems with large capacitors are widely used.
2. Ways to roll back the stator coil 1 phase induction motor
Induction motors 1 phase is essentially the same as the 2-phase induction motors. This sort of thing we see, that in one phase induction motors, there are 2 types of coils, the primary coil (running winding = RW = RV) and the auxiliary coil (starting winding = SW = RB) has a second coil of wire cross section and the amount of twist that not the same. But there are times when it is made almost the same.
The main coil wire has a cross-sectional area larger and more winding number. As for the auxiliary coil has a small cross-sectional area and the number of windings a bit.
If one phase induction motors supply us with a certain voltage, the magnitude of currents in both the coil and the Iu and Ip or can we write Ir and Is will have different values. Thus it will affect the current value Iu and Is having a 90 ° phase shift electrical (el 90o).
a. Step Coil
Intended to measure ground coils is the angle formed between both sides of coil and rated with a letter Yg. To get the maximum spin coupling, the coil should be the same steps with a long pole. The pole distance is the angle between the north pole ground (N) and south poles (S) the nearest. While the distance poles are marked Tho and a distance of electric pole is 180o. When the number of pole pairs of a motor is p, then the total polar is 2p and comparison between the degrees of a circle (degrees of arc = OBS) and degrees of power (OEL) we associate with the pole, then we take the example =
To = P = 1, then 360obs = 1 x 360oel
P = 2, then the 360obs = 2 x 360oel
P = 3, then the 360obs = 3 x 360oel
Thus the comparison between OBS and OEL can write the formula:
aobs = p.aoeL
When the number of grooves in the induction motor stator is G 1 phase of the groove, the grind angle around the stator or a time slot is 360 ยบ G bs. When a motor has a total G groove was = p.360oeL. a = 2p distance around the stator pole or beam G = 2p pole distance.
So: a polar distance = 1E = 180o eL =
, because the measure Yg = 1E coil, the coil measures to:
To obtain the maximum swivel coupling, then the required number of turns a lot, it may not be accommodated on a single stator grooves. For it must be divided into several grooves. This means that for a single coil flow will be divided into a number of windings (coils).
For single-phase induction motor having a pair of poles with a single coil that consists of several coils consisting of several coil sections and each section requires two coils stator grooves thus, for single phase induction motors which have 1 pair of poles will have
a coil sections.
b. Amount of flow per pole per phase
If the number of phases = m, then each phase will have as much G/2p.m coil section, so that on each pole for each phase will take as much G/2p.m groove groove. If the number of grooves on each pole for each phase is marked with the letter g, then the number of grooves per pole per phase to be g = G/2p.m groove.
c. Placing coils (Shifting Place)
To put the coils on each phase, then rub against each other should always be placed where. This sort of thing which aims to turn dihasilkanselaing coupling phase shift. For two-phase induction motor phase shift, for 2 swivel coupling (power play) is 90 ° eL. If shift points are provided with a letter YF, then D = 180 o eL so for motor 2 phase, the value of YF = ½ D. From the description above, it can be obtained several formulas that can be used to convolute induction motors as follows:
The formula for AC motors wrapped around the stator :
&p = Step plot of the coil 1 coil 2 kesisi
G = Number of grooves
2p = The number of poles
p = Number of pole pairs
q = Number of coils per group
m = Number of phases
KAR = flow range is the degree of radical
KAL = flow range is in electrical degrees
Kp = the phase range is
K = Number of the coils in each pole
2-phase AC motor line number 24, 2 pole pairs of the double stage
calculation :
2 phase motors can be used for motor 1 phase by making a larger coil wire and more number of email as the main poles (KU) and the opposite as the poles help (KB)
It was meant to happen different phases, resulting in a moment turn.
Because of this the single-phase motors can be wound concentrically with KU and KB are the snare (to mix).
Stretch of Mixed Picture
Been tried with entanglement meshes KU = 50 convolution, and KB: 40 convolution, = 4 mm, working at a voltage of 50 watts
3. Motor 3-phase Induction Motor with a road system (single layer)
For three phase motors, the entire stator grooves are divided into three equal lots so that each phase has a coil of as much as G / 2.P.3 coil. If the phase phase = m, then each phase will have a coil as much as G / 2.Pm
How to install the coil that is when one is in front of the poles of U, then the other side of the pole must be located in front of S. That is because each phase has a coil of as much as G / 2.Pm, then at each pole of each phase will occupy a plot as much as G / 2.Pm groove. If the number of grooves on each pole for each phase diberikan g mark, then the number of grooves perkutub perfasa namely: g G / 2.Pm groove.
As for how to roll the motor 3-phase stator coils in principle the same as the motor 1 phase, two phase, the difference is in the coil (the coil). For 3-phase motors of each winding is placed as far away as rub against each other so 120oel 2/3 the distance pole or = 2/3 winding steps (D)
For motors with a size of 500 watts or more would be more economical when done (made) 3 phase. Because when executed by 2 or 1 phase, then the motor would have to use a condenser (capacitor) with a relatively large capacity. So it would be very detrimental, due to the properties of the condenser. To clarify the above description, the following are some examples of 3-phase motors to be done rolling back.
The formula for AC motors wrapped around the stator :
To doubel layer :
&p = Step 1 plot from side to side coil of the coil 2
G = Number of grooves
2p = The number of poles
p = pairs of poles
q = A lot of the coils of each group
m = Number of phases
KAR = range is in the degree of radial grooves
KAL = flow range is in electrical degrees
Kp = the phase range is
K = number of coil sides per pole
