Questions like these are common, but to find the best answer, we must first understand the workings of the universal motor, fan theory, the advantages and disadvantages of materials, and the need for vibroacoustic design analysis to select the right motor for the new product. Remember, this aspect of the appliance must be evaluated prior to final production tooling. The high speed allows the use of compact impellers to generate a combination of high airflow when the inlet orifice allows, and high suction when the orifice is restricted. The high speed also allows for better cooling of the motor. An appliance designer or manufacturer must select a motor that will enhance the value of the product.
Universal motors are typically more customized than induction motors.
Let's examine a Hp induction motor. The induction motor may be selected from a catalog, but the universal motor will most likely require customization by its manufacturer. One avenue available for low volume manufacturers is to find a suitable motor in distribution that can be used for their appliance. The B-Pak shown above is one such motor, which is readily available in various performances in low to medium volume from distributors. It is a measure of performance, cost, and delivery.