Study on the estimation of motor electromagnetic force and improvement of estimation accuracy

Electric motors are used in a variety of industrial applications, and it is important to reduce vibration and acoustic noise in electric motors from the viewpoint of comfort and quietness. Electromagnetic forces are the main cause of vibration and acoustic noise in electric motors. Therefore, accurate acquisition of the electromagnetic forces of the motor is important for vibration and acoustic noise reduction. This study aims to establish a method to estimate electromagnetic forces with high accuracy to contribute to motor vibration and acoustic noise suppression. This paper describes a method for estimating electromagnetic forces from air-gap flux density measured by search coils and sensors using a hall element. The experimental results are compared with the FEA results and the effectiveness of the proposed method is demonstrated.