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AssigneeValeo Thermique Moteur
InventorHerve Couetoux
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The invention provides a method of commutation control, for changing the speed of a direct current electric motor of the constant flux type, having an encapsulated inductive winding with n poles, each of which is supplied by a separate brush. In this method, a speed at a level i, where i is in the range 1 to n-1 inclusive, is obtained by connecting a group of i+1 brushes to the terminal of the direct current supply source. The state of connection of the brushes is modified in accordance with a control characteristic which comprises modifying the composition of the group of i+1 brushes to be connected in order to obtain a motor speed at a predetermined level i, and/or by interrupting the connection of one of two consecutive brushes to the brush previously connected during a speed changing operation.
A method for commutation control for changing the speed of an electric motor of the constant flux type having an encapsulated inductive winding driven by a direct current supply and having n poles and n brushes, each of said brushes being associated with one of said poles, the speed of said motor being dependent upon the number of said brushes that are connected to said power supply, said speed of the motor being represented by a level i, where i is in the range 1 to n-1 inclusive, said method comprising the steps of:
A method according to any one of the preceding claims for control of speed changing in a quadruple pole motor, wherein one of the brushes is permanently connected to one terminal of the direct current supply source.
A method for commutation control of an electric motor of the constant flux type having an encapsulated inductive winding driven by a direct current supply and having n poles and n brushes, each of said brushes being associated with one of said poles, the speed of said motor being dependent upon the number of said brushes that are connected to said power supply, said speed of the motor being represented by a level i, where i is the range 1 to n-1 inclusive, said method comprising the steps of:
An apparatus for controlling a direct current electrical motor of the constant flux type having an encapsulated inductive winding drivable by a direct current supply and having n poles and n brushes, each of said brushes being associated with one of said poles, said motor including means for changing the speed of said motor, said speed being dependent upon the number of said brushes that are connected to said power supply, said speed of the motor being represented by a level i, where i is in the range of 1 to n-1, inclusive, comprising:
Dependencies are inferred from the claim text.