To see if the motor is three phase or single phase look at the motor's nameplate. There it will tell you what the voltage needs to be and what system phase the motor needs to be connected to operate properly.
In single phase motors, there are two windings. 1)Main winding 2) starter (auxiliary) winding. As per the double revolving theory in 1 phase machines, motor can rotate if current in the starter winding have near to 90 deg. phase shift wrt main winding. Now current flowing through capacitor leads by 90 deg. Ideally. So this is how we can get two currents which are having phase shift wrt each other. And the machine can rotate.
You have to connect each phase (R,Y & B respectively) of earthing transformer zig zag winding to each phase of power transformer delta secondary respectively. Then the zig zag winding of earthing transformer star point to be earthed.
The Schrage Motor, Model 8234, is a variable-speed polyphase AC motor with both high torque and efficiency. It requires standard three-phase power. The Schrage Motor is used in a variety of industrial applications, such as packaging machinery, conveyors, pumps, and knitting machines, where full torque is needed over a variable speed range. The motor is basically a special wound-rotor motor in which a built-in variablefrequency source is connected to one winding, while the network frequency is applied to the other winding. The voltage of the variable frequency source can be set over a certain range and the resulting speed of the motor depends upon this setting. The Schrage Motor circuit diagram pictured in Figure 1 shows that the primary winding is on the rotor and the insulated secondary winding is on the stator. On the rotor, there is a tertiary, or control, winding, which is connected to the secondary windings on the stator via a commutator and three pairs of adjustable brushes lying on the commutator. When the brushes in each pair move apart or closer together, a variable voltage is applied to the secondary winding by the tertiary winding. The change in voltage varies the speed of the motor below and above synchronous speed.
Single phase induction motor is not self starting because, when the main winding is excited from a single phase supply, it produces an alternating magnetic field instead of rotating magnetic field in two phase and 3 phase induction motor. According to double field revolving theory any alternating vector can be resolved into two vectors rotating in opposite directions, each having magnitude equal to one half the magnitude of the actual vector. The vectors will be rotating in such a way that their resultant will be zero at every instant. Thus a single phase induction motor fails to produce a net starting torque, and is not self starting.It can be made self starting by any of the methods below1) By using an aux winding in series with a very high resistance2) using two capacitors,in series with the aux wdg,one with intermittent duty and the other one with continuous duty3) Using shaded poles
the working principle of single phase induction motor is similar to the three phase induction motor, when we supply is given to the single phase induction motor a revolving field set up in the stator which produces a torqe air gap between north pole and south pole and rotor picks up speed
To shift from a star winding to a delta winding in a three-phase motor, the connections between the windings need to be rearranged. In a star winding, the ends of the windings are connected to a common point (neutral), while in a delta winding, each winding end is connected to the start of the next winding. By physically switching the connections, the motor can be reconfigured from star to delta winding.
Using a multimeter, check the continuity of motor winding from phase to phase ( U to V, V to W , W to U ). Each phase to phase must have a continuity if winding is OK. If any particular phase fails the continuity test, your motor is probably burnt.
The three windings are made the same to maintain a balance in the motor.
For proper working of any 3 phase induction motor it must be connected to a 3 phase alternating current (ac) power supply of rated voltage ...
one windingAnswerA three-phase motor has three phase windings, normally (but not necessarily) connected in delta.
A split-phase motor uses a centrifugal switch to energize and de-energize the start winding. The switch is connected in series with the start winding circuit and is typically set to open when the motor reaches about 75-80% of its operating speed, disconnecting the start winding from the power supply.
In single phase motors, there are two windings. 1)Main winding 2) starter (auxiliary) winding. As per the double revolving theory in 1 phase machines, motor can rotate if current in the starter winding have near to 90 deg. phase shift wrt main winding. Now current flowing through capacitor leads by 90 deg. Ideally. So this is how we can get two currents which are having phase shift wrt each other. And the machine can rotate.
with 3 phase the rotating field is already set up when power is supplied with single phase you use a capacitor and a second winding to set up the rotating field
You use a megger. This allows you to check what the condition of the insulation of the motor windings are. An ohms check on each phase should be an easy way if it reads OPEN then there's your bad phase. Otherwise there are diffrent types of 3 phase motors, could be the brushes, commutator, sliprings, many many things.
Only if you want to damage it. "277" Volt 3-phase will usually mean 277 from each phase to neutral, and 480 from phase to phase. By "230 3-phase", you likely mean 120 phase-to-neutral, and 208 phase-to-phase. If you really mean 230, then you are probably NOT talking about a three phase motor.
The stator consists of the main winding and a starting winding (auxiliary). The starting winding is connected in parallel with the main winding and is placed physically at right angles to it. A 90-degree electrical phase difference between the two windings is obtained by connecting the auxiliary winding in series with a capacitor and starting switch. When the motor is first energized, the starting switch is closed. This places the capacitor in series with the auxiliary winding. The capacitor is of such value that the auxiliary circuit is effectively a resistive-capacitive circuit (referred to as capacitive reactance and expressed as XC). In this circuit the current leads the line voltage by about 45° (because XC about equals R). The main winding has enough resistance-inductance (referred to as inductive reactance and expressed as XL) to cause the current to lag the line voltage by about 45° (because XL about equals R). The currents in each winding are therefore 90° out of phase - so are the magnetic fields that are generated. The effect is that the two windings act like a two-phase stator and produce the rotating field required to start the motor. When nearly full speed is obtained, a centrifugal device (the starting switch) cuts out the starting winding. The motor then runs as a plain single-phase induction motor. Since the auxiliary winding is only a light winding, the motor does not develop sufficient torque to start heavy loads. Split-phase motors, therefore, come only in small sizes. Type your answer here...
Single- and three-phase motors work on the sameprinciple. The field windings create a rotating field which cuts the rotor bars of the rotor, inducing voltages into them, and the field produced by the resulting currents react with the rotating field causing the rotor to spin. If you like, the rotating field 'drags' the rotor around with it.In the case of a three-phase motor, the three out-of-phase phase currents create a naturally-rotating field. However, in the case of a single-phase motor, we must simulate this. This is done by having two, separate, field windings. One is fed directly from the supply, and the other is also fed from the supply via a capacitor. This results in two field currents which are displaced from each other by around 90 electrical degrees, when then create the rotating field necessary for the motor to start and run. You could say that a single-phase motor is equivalent to a 'two-phase' motor. The field winding supplied via a capacitor is known as the 'start winding' or the 'auxiliary winding'.