초록 ▼

A motor drive circuit comprises positive and negative input terminals for connection of the motor circuit to a DC supply, a DC link filter connected between the input terminals: an electric motor having at least two phases, a plurality of motor drive sub-circuits, each connected to a respective phas

A motor drive circuit comprises positive and negative input terminals for connection of the motor circuit to a DC supply, a DC link filter connected between the input terminals: an electric motor having at least two phases, a plurality of motor drive sub-circuits, each connected to a respective phase of the electric motor and which each control the flow of current into or out of the respective phase of the motor that has been drawn from the supply through the DC link filter, and a switching means provided in the electrical path between the DC link filter and the electric motor drive sub-circuits, the switching means being movable between a closed position in which it connects the DC link filter to the motor drive sub-circuits, and an open position which isolates the DC link filter from the motor drive sub-circuits.

대표청구항 ▼

What is claimed is: 1. A motor circuit comprising:a positive input terminal and a negative input terminal each for connection of the motor circuit to a DC supply;a DC link filter connected between said positive input terminal and said negative input terminal;an electric motor having at least two pha

What is claimed is: 1. A motor circuit comprising:a positive input terminal and a negative input terminal each for connection of the motor circuit to a DC supply;a DC link filter connected between said positive input terminal and said negative input terminal;an electric motor having at least two phases:a plurality of motor drive sub-circuits, each connected to a respective phase of said electric motor through an electrical path and which each motor drive sub-circuit controls a flow of current into or out of said respective phase of said motor that has been drawn from said DC supply through said DC link filter; anda switch provided in said electrical path between said DC link filter and said electric motor drive sub-circuits, said switch being movable between a closed position in which it connects said DC link filter to said motor drive sub-circuits, and an open position in which it isolates said DC link filter from said motor drive sub-circuits.