The Impact of Magnet Performance on Electric Motors

Permanent magnet tiles are primarily used in permanent magnet DC motors. Unlike electromagnet motors that generate magnetic potential through excitation coils, permanent magnet motors utilize permanent magnet materials to produce a constant magnetic potential source. Replacing electromagnet excitation with permanent magnet tiles offers numerous advantages: simplified motor structure, easier maintenance, lighter weight, smaller size, reliable operation, reduced copper usage, lower copper losses, and lower energy consumption.

The impact of magnetic tile performance on motors:

(1) A high residual magnetic induction Br ensures the motor achieves high rotational speed, substantial output torque, and significant power. This enables the motor to operate at high efficiency.

(2) A high Hcb ensures the motor generates the required electromotive force, positioning the operating point near the maximum magnetic energy product to fully utilize the magnet's potential.

(3) A high Hcj enhances the motor's resistance to overload demagnetization, aging, and low-temperature conditions.

(4) A high (BH)max. A higher (BH)max indicates a better actual operating coefficient for the permanent ferrite magnets within the motor.

(5) Greater magnetic energy product is preferable, significantly enhancing motor efficiency.

(6) Improved rectangularity of the demagnetization curve reduces dynamic losses in the motor.

(7) Higher resistivity in permanent ferrite minimizes eddy current losses.

(8) A low temperature coefficient in permanent ferrite ensures excellent thermal stability at elevated temperatures.