System and Method for Reducing Radiated Emissions in an Integrated Motor Drive

摘要

A motor drive, configured to be mounted to a motor, includes improvements to input circuits configured to receive and/or transfer power within the motor drive to reduce emissions over prior art motor drives. According to a first embodiment of the invention, the motor drive includes a voltage balancing circuit which utilizes surface mount capacitors having a voltage rating of at least 2772 VDC and, preferably, of at least 5000 VDC. According to another embodiment of the invention, the power supply includes a planar transformer wherein the primary and the secondary coils are uniformly formed by traces on the circuit board.

主权项

1. A motor drive configured to control operation of a motor, wherein the motor includes a rotor, a stator, and a motor housing enclosing the rotor and the stator, the motor drive comprising:
a drive housing mounted to the motor housing; a circuit board mounted within the drive housing having a plurality of layers and including a plurality of traces for establishing electrical connections; a DC bus having a first rail and a second rail, wherein the DC bus is configured to have a DC voltage potential between the first rail and the second rail; a DC bus capacitance connected between the first rail and the second rail; a first capacitor having a first terminal and a second terminal, wherein the first capacitor is mounted to the circuit board and connected via a first trace between the first terminal and the first rail and via a second trace between the second terminal and an earth ground; and a second capacitor having a first terminal and a second terminal, wherein the second capacitor is mounted to the circuit board and is connected via a third trace between the first terminal and the earth ground and via a fourth trace between the second terminal and the second rail and wherein both the first capacitor and the second capacitor have a voltage rating of at least 2772 VDC.