The size of the motor magnets is usually not a factor directly proportional to the energy consumption of the motor. The energy consumption of a motor is determined by a number of factors, including load, run time, voltage and current. Magnet size plays an important role in the design and performance of a motor, but it is usually chosen to improve efficiency and performance, not to reduce energy consumption.

Larger magnets usually provide a stronger magnetic field, which increases the output power and efficiency of the motor. This can reduce the workload of the motor in some applications and therefore may reduce some of the energy consumption. However, in some cases, if the motor is not properly designed, oversized magnets may cause the motor to waste energy at no-load or partially loaded conditions because the motor needs to consume a certain amount of power to maintain the magnetic field even when there is no actual mechanical load.

Therefore, the size of a motor's magnets needs to be selected based on the specific application and performance requirements in order to balance the relationship between performance, efficiency and energy consumption.

The picture shows the curved rare earth magnet of the outer rotor of the motor

If a motor's magnets are too small, it may result in poor motor performance, requiring more current to do the same job, thus increasing power consumption. However, if a motor's magnets are too large, it may also waste material and manufacturing costs, and may increase the size and weight of the motor, which may not be suitable for some applications.

To reduce the energy consumption of a motor, several factors can usually be considered:

1. Selection of high efficiency motors: Select the type of motor that is energy efficient, such as a high efficiency DC motor or a three-phase asynchronous motor.

2. Proper supply voltage: Ensure that the motor's supply voltage matches its rated voltage to avoid additional power consumption.

3. Proper Maintenance: Maintain the motor on a regular basis to ensure that it remains in optimal working condition.

4. Reasonable load control: Control the motor's working load as needed to minimize unnecessary energy consumption.

In summary, the magnet size of a motor is usually selected based on design requirements and is not a factor directly proportional to energy efficiency or power consumption. The energy efficiency and power consumption of a motor are affected by a variety of factors and need to be considered in a comprehensive manner to optimize the performance of the motor.

Other motor magnet posts;

Relationship between motor power size and magnets

Requirement of magnetic matrial and poles for different types of motors

What performance of motor can be improved with good segmented magnet