The Difference Between Single-strand Winding and Multi-strand Winding of Motor Stator Winding Machine

When designing a brushless motor, it is necessary to evaluate the performance of many motor parameters and components, and the stator coil is one of the important components. The motor stator winding machine also has many requirements, and also includes many parameters, such as stator outer diameter, stator inner diameter, stator stack thickness, several wires wound in parallel, wire diameter, number of turns, how many slots, slot distance, etc. Why do some motor coils use more than 10 strands, 20 strands, or even 30 strands of enameled wire when winding, and can't they use a thicker wire instead of winding?

1. Motor winding related

• The thicker the wire diameter, the more difficult it is for the winding machine to wind. Whether it is an external winding machine or an internal winding machine, there are certain requirements for the wire diameter of the brushless motor. Generally, it is not so easy to wind if it exceeds 1.0mm. , Many machines have to be customized non-standard. Compared with general-purpose winding machines, customized winding machines will be much more expensive. Of course, this refers to the problem of wire diameter, and non-standard designs in other aspects are not excluded. So for example, if you need to wind a wire diameter of 2.0mm, if you use several strands of wire to wind together, you can use a general-purpose machine to solve it, and the effect is the same.

• The problem of wire damage, the thicker the wire diameter when winding, the easier it is to scratch the enameled wire skin when it is bent, and it is easy to cause damage to the wire.

2.The motor itself

• When the current passes through the wire, there will be a skin effect, which can weaken the over-current capability of the winding. That is to say, the over-current capability of multiple wires is definitely stronger than that of a single wire, and the over-current capability of the small size is large.

• For the maintenance of the motor itself, large wire diameters are generally rarely used. Many repair shops do not have general-purpose enameled wires in stock. Using multiple wires instead of a single wire can also solve many after-sales troubles.