Recently, the brushless dc motor small make up in the south of anhui technology department colleagues often receives the user to make a phone call to ask about the three-phase brushless dc motor in the south of anhui connection problem, so today small make up take you know how to correct connection three-phase brushless dc motor. Three-phase brushless dc motor of the three-phase winding of six lug derivation, the six wiring in the junction box, and marked symbol D1, D2, D3, D4, D5, D6, D1 and D4, D2 and D5, D3 and D6 as A phase, called A, B, C three-phase winding, as shown in the figure below. Three-phase brushless dc motor wiring method has two kinds, one kind is delta connection, with symbol & other; △” Said. The other is a star connection, use symbol & otherY”Said. So-called delta connection is the junction box of six in the terminal, after two column with metal connected up and down, to connect power, respectively, as shown in the diagram below a. The so-called star connection is connect the top three terminal with sheet metal, the following three terminal to connect power, respectively, are shown in figure b below. Motor three-phase winding is connected in any way, to see the nameplate indicating the voltage and the connection mode, if the nameplate 220/3 marked voltage 80 v, connection delta t/Y, there are two kinds of connection mode shows that the station motor, adapt to the two different voltage. If the supply voltage is 220 v, can into triangles. Such as misconnection into a star, can make from each phase winding voltage from 220 v down to 220 / & radic; 3 = 127 v, the motor will be because of the low voltage starting up, such as remained under rated load, is likely to cause overload burning. If the supply voltage is 380 v, connected into a star, such as the misconnection into triangles, each phase winding can bear 380 v voltage caused by burn winding of the stator current. So the correct connection mode, should be able to make the motor in normal work, on the power supply voltage must be equal to or close to the rated voltage of the motor.
