The motor is responsible for the production of power, and this power runs the cleaner. This power is used to create a suction that can pick up all the debris and mess. The most common areas where a motor may lose its power is the hose of the vacuum cleaner, broken belt, a vacuum bag, clogged rollers or a faulty gasket. Anyone of this problem or all of them altogether leads directly to making a motor lose its power.
To make it better, you are always advised to use the right setting of the cleaner. Change the bag and filter periodically so that the motor can perform its best. Clean and unclog the hose and make sure that it is airtight. Clean the rollers as well and try to change the rubber belt as well. All these measures will help you to maintain the power of the motor in an optimum condition.