Magnetic pads are mainly used in permanent magnet DC motors, unlike electromagnetic motors that generate a magnetic potential source through excitation coils. Permanent magnet motors use permanent magnet materials to generate a constant magnetic potential source. Permanent magnet pads instead of electric excitation have many advantages, such as simple motor structure, convenient maintenance, light weight, small volume, reliable use, low copper consumption, low energy consumption, etc.

The Effect of Magnetic Pad Performance on Electric Motors

(1) High residual Magnetic flux density Br. Because under the same magnetic pole surface area and air gap, high Br can generate large output torque and power. Electric motors only have high efficiency.

(2) High Hcb. Because the Hcb is high, it is necessary to ensure the required electromotive force for the motor output, so that the motor's working point is close to the maximum magnetic energy product, fully utilizing the ability of the magnet.

(3) High Hcj. High Hcj can ensure that the motor has strong anti overload demagnetization, anti-aging and low temperature resistance.

(4) High (BH) max. The higher the (BH) max, the better the actual operating coefficient of the permanent magnet ferrite in the motor.

(5) Magnetic energy Φ The larger the better, this will greatly improve the working efficiency of the motor.

(6) The better the rectangularity of the demagnetization curve, the smaller the dynamic loss of the motor.

(7) The higher the resistivity of permanent magnet ferrite, the smaller the eddy current loss.

(8) The temperature coefficient of permanent magnet ferrite is small, and it only has good temperature stability at high temperatures

(9) The starting current is small and the time constant is small. The impact on the power supply is small.