A three-lead motor's stator windings can be linked in either a Delta or a Wye configuration (see Figure 1). These motors are wound for a single voltage, and the windings are coupled during the manufacturing process as either Wye or Delta. The term "Wye connected" will be used here to describe any set of three adjacent wires that could possibly provide power to the motor.
The choice between Wye and Delta connections affects which direction the rotor will rotate. If you connect the stator coils in a Delta configuration, then the rotor must be inserted with its magnetic piece facing outwards. This is called "clockwise rotation." If you connect the stator coils in a Wye configuration, then the rotor can be inserted into the motor with its magnetic piece facing in either direction, since it makes no difference which way the current flows through it. This is called "counterclockwise rotation."
There are many different types of motors, and each type has its own advantages and disadvantages. For example, a DC motor uses two pairs of wires to send electricity to its stator, while an AC motor uses three pairs of wires (one positive, one negative) along with a capacitor to send electricity to its stator. Both types of motors have their advantages and disadvantages; what's important is that you know which type of motor you need for your project.
Delta/Wye motors (D/Y) are wound with two distinct voltage connections in mind. The motor may be connected for either 230V or 400V depending on the installation voltage. Because this sort of winding is often supplied by European motor manufacturers, the stators are frequently rated for 50Hz, however 60Hz varieties do exist. Since delta/wye motors cannot be operated from a single line frequency, they must be designed for a specific application.
In general, delta/wye motors are available in three different configurations: single-speed, two-speed and three-speed. A single-speed motor will run at one speed only, while two-speed motors can run at two different speeds simultaneously. Three-speed motors will usually run at three different speeds. Which type of delta/wye motor you get depends on what kind of operating performance you need and what kind of wiring is available. In general, the more speeds a motor has, the more expensive it is. However, there are three-speed motors that cost less than two-speed counterparts.
Since delta/wye motors are not self-starting, they need an external "commutation" device to provide power to the electromagnets as the motor spins. Most commonly, this is done using a motor controller. Other types of controllers include contactors and relay banks. Motor controllers can be wired into an existing circuit or installed separately. They can also be wireless if a transmitter is used instead.
A motor can be linked in either direction using the linkages illustrated below. However, consult the manufacturer's specifications since certain three-phase motors MUST be connected in Star or Wye because, as you can see, there are two motor windings in series between each line in Wye. I know this from personal experience, having burned out one motor.
Having said that, any motor can be connected in either configuration and both will run equally well if the load they are driving is equal on all three phases. You just need to make sure that you don't have two different loads on different phases of the same circuit. For example, if one circuit has a light while another has a refrigerator, they must be connected in opposite configurations so that no two circuits have identical connections.
In addition, motors should never be connected together in a "Y" configuration because then only one phase would be loaded which could cause damage to the machine.
Finally, motors must always be connected in either a Star or Wye configuration because it allows for easy separation of power when installing wiring. If both were linked together, then removing one would also remove its companion motor because their power leads are now tied together. This could cause problems if not done properly.
So, yes, a star motor can be connected to a wye motor but not vice versa.
They are often used on three-phase, three-lead motors, although they may also be used on six-phase motors. Solid-state starters use an electrical mechanical approach to lower the voltage to the motor, whereas solid-state starters use a solid-state device known as an SCR to reduce the voltage. The Wye-delta configuration is especially useful for three-phase motors because it allows each phase of the motor to have its own independent source of power. This is necessary when starting a three-phase motor because all phases must be powered in order for the motor to run properly.
Wye-delta starters are commonly used on large industrial motors such as those found in electric generators or hydraulic pumps. These motors can be very dangerous if not started in a controlled manner so special equipment is required to do this job safely. First, if there is no load on the motor, it will try to run until something stops it such as a locked rotor or broken stator wire. When this happens, the motor will start spinning rapidly until it wears itself out or someone comes along and turns off the power supply. To prevent this from happening, starter circuits are used to apply electricity to the motor's shaft in order to spin it up gradually instead of letting it run away.
These starter circuits are usually built into the motor casing near where the shaft goes in. They usually have Wye and Delta connections for the three phases of current needed by the motor.
Delta-Wye The most common three-phase transformer connection is the delta-wye connection. The wye-connected secondary distributes single-phase load among the three phases to neutral rather than placing it all on one winding as with a four-wire delta secondary. A wye-connected load will therefore have three live wires and one ground wire, while a delta-connected load has only two live wires and one neutral.
The term "three phase" means that each conductor carries a different phase of current flow. The three conductors are called "phases" because they begin to rotate clockwise when connected to line voltage, and counterclockwise when connected to negative voltage. For example, if line voltage is 120 volts, then conductor 1 would be 12 inches off of center, conductor 2 would be 12 inches from center but opposite in direction, and conductor 3 would be 12 inches away in the other direction.
In many countries, including the United States, Canada, and parts of Europe, power is delivered over three conductors instead of four. If you are lucky enough to live in one of these countries, then you are already using three-phase power. Otherwise, you need to learn about how it works before you can use it! Three-phase power is usually supplied by a generator which produces the power at approximately 60 cycles per second (hertz), the same as a standard household wall outlet.