Brushless motor and electrical equipment

Abstract

The invention provides a brushless motor and electrical equipment, the brushless motor comprises a casing, a stator and a rotor, the stator comprises a stator iron core and a winding, the rotor comprises a rotor core and a rotating shaft, the rotating shaft is sleeved with bearings, two ends of the casing are each provided with a bearing bracket for fixing the two bearings, a first conducting strip and a second conducting strip are arranged between at least one bearing bracket and the stator iron core, the first conducting strip and the second conducting strip are oppositely arranged side by side at intervals, the first conducting strip is electrically connected with the stator iron core, and the second conducting strip is electrically connected with the adjacent bearing brackets. The brushless motor is internally provided with the first conducting strip and the second conducting strip which are electrically connected with the stator core and the bearing brackets respectively, and thefirst conducting strip and the second conducting strip are arranged side by side at an interval, so that the first conducting strip and the second conducting strip can be matched to adjust the capacitive reactance between the stator core and the bearing brackets, the potential of the bearing outer ring is close to that of the bearing inner ring, shaft voltage is reduced, and electric corrosion ofthe bearing is avoided.

Description

technical field [0001] The invention belongs to the field of motors, and more specifically relates to a brushless motor and electrical equipment using the brushless motor. Background technique [0002] In recent years, due to the energy-saving trend of air-conditioning units, high-efficiency brushless DC motors have been used to drive fans instead of induction motors. These brushless DC motors are generally driven by an inverter, which uses a pulse width modulation (Pulse Width Modulation) method (hereinafter referred to as PWM) as a driving method. When using the PWM driving method, since the neutral point potential of the winding is not zero, a common-mode voltage will be generated; in the case of high frequency, coupling capacitance will be generated between the structures of the motor, and this common-mode voltage will pass through The coupling capacitance and bearing capacitance form a loop between the stator, rotor, rotor core, bearing bracket and other parts, which w...

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Problems solved by technology

[0003] The purpose of the embodiments of the present invention is to provide a brushless motor to solve the problem in the prior art that the shaft voltage of the brushless motor is too high and cause electric corrosion of the bearing

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