Brushless motors and electrical equipment
A technology of brushless motors and casings, which is applied in the field of electrical equipment and brushless motors. It can solve problems such as excessive voltage and bearing electric corrosion, and achieve the effects of reducing potential difference, avoiding electric corrosion, and reducing shaft voltage.
Active Publication Date: 2022-02-18
GUANGDONG WELLING ELECTRIC MACHINE MFG
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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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[0050] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0051]It should be noted that when an element is referred to as being “fixed” or “disposed on” another element, it may be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0052] In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indica...
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The invention provides a brushless motor and electrical equipment. The brushless motor includes a casing, a stator and a rotor. The stator includes a stator core and windings. The rotor includes a rotor core and a rotating shaft. The rotating shaft is sleeved with bearings. Bearing brackets are respectively installed, conductive sheets are arranged at intervals on the outer surface of at least one bearing bracket, a dielectric layer is provided between the conductive sheet and the corresponding bearing bracket, and the conductive sheet is electrically connected with the stator core. In the brushless motor, conductive sheets are arranged at intervals on the outer surface of the bearing bracket, and a dielectric layer is arranged between the conductive sheet and the corresponding bearing bracket, so that a capacitance is formed between the conductive sheet and the bearing bracket, and the conductive sheet and the stator The electrical connection of the iron core is equivalent to connecting the capacitor in series between the bearing bracket and the stator core, and then adjusting the capacitive reactance between the bearing bracket and the stator core to balance the potential between the inner ring and the outer ring of the bearing and reduce the The potential difference between the inner ring and the outer ring of the bearing reduces the shaft voltage and avoids electric corrosion.
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, permanent magnet, bearing bracket and other parts, w...
Claims
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IPC IPC(8): H02K5/16H02K11/00
CPCH02K5/161H02K11/0094H02K5/16H02K11/00H02K5/22
Inventor 李国雄黄成栋胡建吕继方钟贵烈曾路强
Owner GUANGDONG WELLING ELECTRIC MACHINE MFG