Electricity: motive power systems – Switched reluctance motor commutation control
Reexamination Certificate
2000-03-13
2001-05-29
Masih, Karen (Department: 2837)
Electricity: motive power systems
Switched reluctance motor commutation control
C318S132000, C318S434000, C318S434000
Reexamination Certificate
active
06239565
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a system for controlling a brushless electric motor comprising a plurality of stator windings or phases which are arranged in respective circuit branches and each of which is in series with a corresponding controlled electronic switch, the circuit branches being connected, at one end, to one pole of a direct-current voltage supply and, at the other end, to the other pole of the supply, by means of an electronic regulation switch.
Such systems typically include generator means for supplying electrical signals indicative of the angular position of the rotor of the motor, and a driver circuit arranged to control conduction in the controlled switches associated with the phases of the motor and in the regulation switch in predetermined manner in dependence on the position signals emitted by the generator means, the regulation switch, in particular, being driven in an on/off manner by means of a square-wave control signal.
The object of the present invention is to provide a system of this type having improved characteristics.
SUMMARY OF THE INVENTION
This and other objects are achieved, according to the invention, by a system of the type specified above, characterized in that it includes a protection circuit including:
a capacitor coupled to the control input of the regulation switch so that the capacitor is charged each time the regulation switch is made conductive by the square-wave control signal in operation, and
a control switch connected between the control input of the regulation switch and the other pole of the direct-current voltage supply and having a control input connected to the capacitor so that the control switch is made conductive and cuts off the regulation switch when the latter remains conductive continuously for a period of time longer than a predetermined period.
Among other things, the protection circuit of the control system according to the invention advantageously protects the regulation switch should the rotor of the motor be stopped in operation.
REFERENCES:
patent: 3812413 (1974-05-01), Keidl
patent: 6060848 (2000-05-01), Alvaro et al.
Acquaviva Sebastiano
Alvaro Nicolino
Howrey Simon Arnold & White , LLP
Masih Karen
Plaset Spa
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