Excessive brush sparking in a vacuum motor can indicate several potential malfunctions or issues with the vacuum cleaner. It's essential to address these problems promptly to avoid further damage and ensure safe operation. Here are some possible causes of excessive brush sparking:
Worn or Damaged Carbon Brushes: The carbon brushes inside the motor can wear out over time due to regular use. If the brushes are worn down to the point where the metal casing makes contact with the armature, it can lead to excessive sparking and damage to the motor.
Faulty Armature: The armature is the rotating component of the motor that interacts with the carbon brushes to create the electrical current. If the armature is damaged or has worn-out sections, it can cause increased sparking.
Overheating: Excessive sparking can also result from the motor overheating. This can occur if the vacuum is used for an extended period without adequate cooling or if there's a problem with the motor's ventilation system.
Electrical Issues: Problems with the electrical wiring or connections can lead to increased sparking. Loose or damaged wires may cause irregular electrical flow, resulting in sparking.
Regarding the switch spontaneously causing reversed direction, it is highly unlikely. The direction of a motor is determined by its design and wiring, and the switch itself should not be capable of spontaneously reversing the motor's direction. If the vacuum cleaner is behaving in this way, it indicates a severe electrical fault and should be addressed immediately by a qualified professional.
For your specific issue with the Kirby G4 burning up brushes, it is essential to have the vacuum inspected and repaired by an authorized Kirby service center or a qualified vacuum repair technician. Attempting to fix the problem yourself may lead to further damage or potential safety hazards.
In summary, excessive brush sparking in a vacuum motor can be caused by worn or damaged carbon brushes, a faulty armature, overheating, or electrical issues. It is best to seek professional repair to diagnose and resolve the problem properly.