What is the result of having low spring tension in motor brushes?

Having low spring tension in motor brushes leads to brush arcing, which is a significant concern in electrical machinery. The function of the brushes is to maintain contact with the commutator, allowing for the transfer of electrical current. When the spring tension is insufficient, the brushes may not maintain a stable and firm contact, which can result in intermittent contact with the commutator.

This intermittent contact can cause increased resistance at the interface, leading to electrical arcing. Arcing occurs when the electrical current jumps across the gap instead of flowing smoothly through the brushes, creating localized heating and potential damage to both the brushes and commutator surface. This can not only lead to decreased performance and efficiency of the motor but may also necessitate more frequent maintenance or replacement of components.

The other outcomes that might suggest improved performance, better electrical connections, or prevention of overheating do not accurately reflect the consequences of low spring tension, which predominantly results in enhanced wear and operational issues due to the arcing phenomenon.