What is PCB Stator3

The working principle of an electric motor stator.

The stator is the stationary part of an electric motor. In most motors, the stator generates a rotating magnetic field that drives the rotation of the rotor, thereby converting electrical energy into mechanical energy.

The stator consists of two main components: the core and the windings. The core is typically made up of laminated silicon steel sheets to reduce hysteresis and eddy current losses; the windings refer to the conductors wound in the slots of the core, which are responsible for generating the magnetic field.

Electric motor structure schematic diagram.

Source：Nidec

Key considerations in stator design for electric motors.

Core material.

Core material choice affects motor performance and efficiency; high-permeability silicon steel is commonly used for better magnetic efficiency.

Winding insulation.

Copper windings require good insulation to prevent current leakage and short-circuiting.

Cooling

The motor's characteristics necessitate long-term stable operation, so its cooling must be well-designed to minimize heat buildup during operation and maintain the motor's temperature within the optimal efficiency range.

The composition of an electric motor's stator and rotor.

Source：VectorMine

Why use PCB technology for processing motor stators?

The background of commercial applications for PCB motor stators.

Early PCB stator technology was primarily used for small power axial flux motors, which have high torque, small size, and light weight, making them particularly suitable for installation in handheld devices. For example, handheld lawn mowers use axial flux motors with PCB stators. As shown in the figure below, the PCB stator in a handheld lawn mower uses a 6-layer PCB process with 4oz thick copper.