In the construction and operation of the motor, the magnet plays a crucial role, and the strength of its magnetism will bring many aspects of motor performance.
First of all, the magnetic strength of the magnet is intimately related to the torque and speed of the motor. In general, the stronger the magnetic force, the greater the torque of the motor, but accordingly the speed will grow smaller; on the contrary, when the magnetic force is minimal, the speed will increase, but the torque falls. Furthermore, in a given range of magnetic field strength the stronger the magnetism is more beneficial to the motor; nevertheless, once more than the coil magnetic field strength of a particular value the magnetism of the motor will start to decrease.
Second, motor power and magnetism size have also been found to correlate. The size of the magnet's magnetism in the motor and the amount of power it will output have a relationship; usually, the more the magnetism, the more the motor will output. Because of this, such as high-speed motors will generally choose neodymium iron boron tiles, is to look at the characteristics of its strong magnetic force, rather than choosing permanent magnet ferrite tiles.
Moreover, different voltages of motors fit different magnetic strengths of magnets. Whereas weak magnets are generally utilised in motors with low voltage, strong magnetic magnets are mostly employed in motors with high voltage. This could be because powerful magnets are readily impacted by their own strong magnetic force when the voltage is low, or even unable to rotate properly; weak magnets are too little in torque to satisfy the practical use while facing high voltage.
Furthermore, under the same energised conditions, the speed and torque of the motor directly influence the magnitude of the magnet magnetic. The motor having great magnetism will rotate quicker and have more torque; the motor with low magnetism will rotate slower and have less torque.
Finally, the temperature coefficient of the magnet also has an effect on the motor temperature. This mainly depends on the actual temperature of the motor operating environment, if the actual temperature does not exceed the limit temperature of the magnet, it does not have much impact; but if it exceeds the limit temperature, the magnet will appear demagnetization or even demagnetization, once there is no magnetic field, the motor is no longer a permanent magnet motor. Therefore, in the selection of motor magnets, tend to pick than set the maximum temperature value of a higher grade of products.
In short, the magnetism of the motor magnet on the motor performance has a multifaceted and can not be underestimated the impact of understanding these influencing factors for the reasonable selection of the motor as well as to better play its performance is of great significance.