Converter circuit for a polyphase switched inductive load
First Claim
Patent Images
1. A converter circuit for an n-phase inductive electrical load (n>
- 1), comprising a first energy source and m first switch means (n>
m≧
1 and m/(n-m)≧
2) each arranged to control the energization of a corresponding one of a first group of m phases of the load by the first energy source, the circuit further comprising a second energy source and n-m second switch means, the n-m switch means being arranged to control the energization of a corresponding one of a second group of n-m phases by the second energy source to transfer energy in its associated phase of the load to charge the first energy source.
2 Assignments
0 Petitions
Accused Products
Abstract
A converter circuit for an inductive load, such as the phase windings of a switched reluctance motor, uses only n-switches for n-phases. In a four phase machine, each of three of the phases is serially connected with a switch across one voltage source. The remaining phase is serially connected with a switch across another voltage source which receives the inductive energy returned by the other three phases. This returned energy is used to energize the fourth phase. A generator converter is also disclosed in which the energy in the fourth phase is used to provide the excitation for the other three phases.
-
Citations
20 Claims
-
1. A converter circuit for an n-phase inductive electrical load (n>
- 1), comprising a first energy source and m first switch means (n>
m≧
1 and m/(n-m)≧
2) each arranged to control the energization of a corresponding one of a first group of m phases of the load by the first energy source, the circuit further comprising a second energy source and n-m second switch means, the n-m switch means being arranged to control the energization of a corresponding one of a second group of n-m phases by the second energy source to transfer energy in its associated phase of the load to charge the first energy source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- 1), comprising a first energy source and m first switch means (n>
-
15. A converter for an inductive load having N phases, where N is an integer greater than 2, the converter circuit comprising:
-
a first energy source; a second energy source; M first switching devices that may be actuated to couple a first subset of the N phase windings to the first energy source, where M is an integer less than N and greater than or equal to 1, and where M/(N-M) is greater than or equal to two; and N-M second switching devices that may be actuated to couple a second subset of the N phase windings to the second energy source to transfer energy from a phase winding in the second subset of the N phase windings to the first energy source. - View Dependent Claims (16, 17)
-
-
18. A system including:
-
an inductive load having N phases; a first energy source; a second energy source; M switches coupled to a first subset of the N phases that may be actuated to couple the first subset to the first energy source, where M is an integer less than N and greater than or equal to 1, and where M/(N-M) is greater than or equal to two; and N-M switches that may be actuated to couple a second subset of the N phase windings to the second energy source to transfer energy from a phase winding in the second subset of the N phase windings to the first energy source. - View Dependent Claims (19, 20)
-
Specification