Electrical Drive With Switchable Coil Sections
AssigneeC. & E. Fein GmbH
InventorLothar Dietl
Life of this patent
Estimating the term…
Abstract
The invention relates to an electrical drive having a motor with a rotor and a stationary stator, which has a coil arrangement, and having a motor controller for controlling the motor, with the motor controller being configured to pass current through the coil arrangement in order to produce an excitation field, with the coil arrangement having a plurality of coil winding sections, and with each coil winding section having a plurality of coil sections, wherein the polarity of at least one coil section of the plurality of coil sections of each coil winding section can be selectively reversed with respect to the other coil sections of the coil winding section. The drive is particularly suitable for use for an electrical tool.
Claims20
An electrical drive, comprising:
- a motor having a rotor and a stationary stator;
- a coil arrangement provided on said stator;
- a motor controller for controlling the motor, said motor controller being configured for passing current through said coil arrangement for generating an excitation field;
- a plurality of coil winding sections arranged on said coil arrangement, each coil winding section having at least a first coil section and a second coil section, said first coil section having a first polarity, and said second coil section having a second polarity;
- and
- at least one polarity reversing switch for switching said plurality of coil sections of a coil winding section between a first state, in which all coil sections in said coil winding section have the same polarity, and a second state in which at least one of said coil sections of said plurality of coil sections has a polarity opposite a polarity of the remaining coil sections in said coil winding section;
- wherein said motor controller is configured to operate said motor with a first rotation speed/torque characteristic having a first gradient and with a second rotation speed/torque characteristic having a second gradient being different from said first gradient.
An electrical drive, comprising:
- a motor having a rotor and a stationary stator;
- a coil arrangement;
- a motor controller for controlling said motor, said motor controller being configured for passing current through said coil arrangement for generating an excitation field;
- at least one switch;
- a plurality of coil winding sections arranged on said coil arrangement, each coil winding section having at least a first coil section and a second coil section, said first coil section having a first polarity, and said second coil section having a second polarity;
- wherein said at least one switch is configured for selectively reversing at least one of said first and second coil sections with respect to another one of said first and second coil sections.
An electrical power tool, comprising a tool spindle configured for driving a tool, and further comprising an electrical drive for driving said tool spindle, said electrical drive comprising:
- a motor having a rotor and a stationary stator;
- a coil arrangement provided on said stator;
- a motor controller for controlling the motor, said motor controller being configured for passing current through said coil arrangement for generating an excitation field;
- at least one switch;
- and
- a plurality of coil winding sections provided on said coil arrangement, each coil winding section having at least a first coil section and a second coil section, said first coil section having a first polarity, and said second coil section having a second polarity;
- wherein said at least one switch is configured for selectively reversing at least one of said first and second coil sections with respect to another one of said first and second coil sections for reversing one of said first and second polarities with respect to another one of said first and second polarities.
Dependencies are inferred from the claim text.