EMC-demand-requiring permanent magnet direct current motor of capacitor triangle-type connection structure

Abstract

The invention discloses a permanent magnet direct current motor with a capacitor delta connection structure meeting EMC requirements, and belongs to the technical field of permanent magnet direct current motors. The rotor assembly of the permanent magnet DC motor includes the motor shaft and the oil baffle plate, commutator, varistor, PCB board, iron core, copper sleeve and gasket arranged on it in sequence. The rotor coil of the rotor assembly is wound on the rotor iron Between the core slots; the PCB board is provided with several chip capacitors, and the chip capacitors are connected to the commutator through the PCB board; the several chip capacitors are connected on the PCB board through a "△" type connection circuit , the piezoresistor is placed on the upper layer of the PCB and welded to the commutator pin. The permanent magnet DC motor of the present invention replaces the traditional structural design of placing electrolytic capacitors in the rotor coil gap by introducing a PCB board with patch capacitors, so as to achieve higher EMC effects and reduce processing and manufacturing costs.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet direct current motors, in particular to a permanent magnet direct current motor with a capacitor delta connection structure meeting EMC requirements. Background technique [0002] The permanent magnet DC motor that meets the requirements of EMC (Electro Magnetic Compatibility, Electromagnetic Compatibility) means that the electromagnetic interference generated by the permanent magnet DC motor on the environment during normal operation cannot exceed a certain limit; to avoid the impact of electromagnetic waves on social production activities harm to human health. [0003] Since the permanent magnet DC motor needs to pass the EMC test, based on this consideration, in the prior art, capacitors are welded on the commutator segments to achieve the effect of passing the EMC test. [0004] A permanent magnet direct current motor meeting EMC requirements in the prior art includes a stator assemb...

AI Technical Summary

Problems solved by technology

The rotor assembly of the permanent magnet DC motor usually adopts 3 electrolytic capacitors to be placed in the gap of the 3-slot rotor coil, and one end of the capacitor pin is connected by a short-circuit copper ring to form a "Y" connection circuit, and a piezoresistor is welded. The absorbing effect of the capacitor element meets the requirements of the electromagnetic compatibility standard, and the following series of procedures and personnel are required: 2 people for capacitor cutting and shaping, 1 person for gap welding of the short-circuit ring, 3 people for installing the short-circuit ring on the capacitor, and 1 person for welding the short-circuit ring and the negative electrode of the capacitor , 2 people for installing the rotor on the short-circuit ring, positioning, 0.5 people for capacitance testing, and 0.5 people for cutting off the excess capacitor pins on the short-circuit ring. The processing technology is complex, cumbersome, time-consuming and labor-intensive, and the processing and manufacturing costs of the motor are high

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