There are several ways to increase the power of an electric motor used for commercial purposes. Here are some methods that can be adopted to improve the power of motors:

1. Using a soft iron core: The soft iron core becomes magnetized and increases the strength of the magnetic field, making the motor more powerful.

2. Increasing the number of turns of the rotating coil: This increases the strength of the magnetic field and makes the motor more powerful.

3. Increasing the strength of the current in the motor: This helps in increasing the power of motors.

4. Using stronger magnets: This increases the strength of the magnetic field and makes the motor more powerful.

5. Multiplying the number of coils: This increases the strength of the magnetic field and makes the motor more powerful.

In addition to these methods, there are also ways to improve the efficiency of electric motors, which indirectly affects their power output. For example, keeping the motor surroundings clean, reducing the thickness of lamination, and providing proper maintenance can improve the efficiency of the motor, which in turn can increase its power output.