Linear actuator comprising a brushless polyphase electric motor
First Claim
1. Linear actuator comprising a brushless multiphase synchronous electric motor having a stator and a rotor acting on a control organ through a driving means for converting, over several revolutions, rotational movement into a linear displacement;
- a springy and/or magnetic restoring means for systematically restoring the control organ into a reference position in the event of interruption of the power supply to the motor;
a position-detection device of the motor contributing, in combination with an electronic control unit, to the control or the adjustment of the position of the rotor and the control organ; and
an independent reversible reduction device associated with the driving means.
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Abstract
A linear actuator includes a brushless polyphase synchronous electric motor having a stator and a rotor. The rotor acts on a control element via a driver which can transform the rotation movement thereof into a linear movement over several rotations. Preferably, the inventive actuator comprises elastic and/or magnetic return device which can systematically return the control element to a reference position when the power supply to the motor is cut. The motor has a position detection device which, together with an electronic control unit, is used for the automatic control and regulation of the position of the rotor and, therefore, the control element.
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Citations
13 Claims
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1. Linear actuator comprising
a brushless multiphase synchronous electric motor having a stator and a rotor acting on a control organ through a driving means for converting, over several revolutions, rotational movement into a linear displacement; -
a springy and/or magnetic restoring means for systematically restoring the control organ into a reference position in the event of interruption of the power supply to the motor;
a position-detection device of the motor contributing, in combination with an electronic control unit, to the control or the adjustment of the position of the rotor and the control organ; and
an independent reversible reduction device associated with the driving means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification