Single-layer winding three-phase asynchronous motor
Release Date:
2024-04-03
A single-layer winding is one where only one active side of a coil is embedded in each stator slot, so the total number of coils is only half of the total number of motor slots.
Single-layer winding is a winding where only one active side of the coil is embedded in each slot of the stator, so the total number of coils is only half the total number of motor slots. The advantages of single-layer winding are fewer winding coils, relatively simple process; no absolute edge between layers, improving slot utilization; and no phase breakdown faults between single-layer structures. The disadvantages are that the electromagnetic waveform generated by the winding is not ideal, the motor's iron loss and noise are relatively large, and the starting performance is slightly worse, so single-layer windings are generally only used in small-capacity asynchronous motors. Single-layer windings can be divided into various winding forms such as chain winding, interleaved chain winding, concentric winding, and interleaved concentric winding, depending on the shape of their coils and the arrangement of their end connections.
1. Chain Winding
Three-phase asynchronous motor
Three-phase asynchronous motor [8]
Chain winding consists of single-layer coil elements of the same shape and width, named because each coil at the winding end resembles a chain link. For single-layer chain winding, special attention should be paid to ensuring the coil pitch is an odd number, otherwise the winding cannot be arranged.
2. Interleaved Chain Winding
For interleaved chain winding, when the number of slots per pole and per phase (e.g., 9) is more than 2, chain winding cannot be arranged with an odd number of turns, and single or double coil interleaved winding must be used.
3. Concentric Winding
In concentric winding, all coils of the same magnetic pole are grouped around the same central phase.
4. Interleaved Concentric Winding
When the number of slots per phase in each level Q is greater than 2, even numbers can take the form of concentric winding.
The advantages of single concentric winding and cross concentric winding are that the winding and embedded wires are relatively simple. The disadvantage is that the coil ends are too long, leading to excessive wire consumption. Currently, this form of winding is rarely used, except for occasional use in small-capacity 2-pole and 4-pole motors.
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