Method and system for determining a rotor position in a wound field DC motor
First Claim
1. A method for determining a rotor position in a dc motor having a plurality of windings, including a rotor winding and a plurality of stator windings, comprising the steps of;
- producing a changing current flow in a pulsed winding to induce a response signal in other windings of the plurality of windings;
in response to the pulsed winding being the rotor winding, performing the step of analyzing response signals induced in two of the stator windings to compute the rotor position;
in response to the pulsed winding being one of the stator windings, performing the steps of;
storing a characteristic of the response signal induced in the rotor winding;
producing a changing a current flow in a different one of the stator windings to induce a second response signal in the rotor winding; and
analyzing the stored characteristic of the response signal induced in the rotor winding and the second response signal induced in the rotor winding to compute the rotor position.
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Accused Products
Abstract
A method for determining a rotor position in a DC motor having a plurality of windings, including a rotor winding and a plurality of stator windings begins with producing a changing current flow in a pulsed winding to induce a response signal in other windings of the motor. The pulsed winding may be the rotor winding or selected ones of the stator windings. If the pulsed winding is the rotor winding, response signals induced in at lest two of the stator windings are analyzed compute the rotor position. If the pulsed winding is the stator winding, response signals induced from pulsing at least two stator windings are sensed in the rotor winding and analyzed compute the rotor position. A system for computing a rotor position may include comparators for comparing induced response signals in stator windings.
28 Citations
20 Claims
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1. A method for determining a rotor position in a dc motor having a plurality of windings, including a rotor winding and a plurality of stator windings, comprising the steps of;
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producing a changing current flow in a pulsed winding to induce a response signal in other windings of the plurality of windings;
in response to the pulsed winding being the rotor winding, performing the step of analyzing response signals induced in two of the stator windings to compute the rotor position;
in response to the pulsed winding being one of the stator windings, performing the steps of;
storing a characteristic of the response signal induced in the rotor winding;
producing a changing a current flow in a different one of the stator windings to induce a second response signal in the rotor winding; and
analyzing the stored characteristic of the response signal induced in the rotor winding and the second response signal induced in the rotor winding to compute the rotor position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for determining a rotor position in DG an automobile alternator having a plurality of windings, including a wound field-rotor winding and a plurality of wye-connected stator windings, the system comprising:
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a pulse generator for producing a changing current flow in the wound field rotor winding to induce a response signal in each of the wye-connected of windings;
a sensors coupled to the wye-connected stator windings for measuring a response signals in the wye-connected stator sensed windings; and
comparators coupled to the sensors for the in simultaneously comparing selected pairs of response signals induced in the wye-connected stator windings to compute the rotor position.
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13-17. -17. (canceled)
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18. A system for determining a rotor position in a motor having a plurality of windings, including a wound field rotor winding and a plurality of wye-connected stator windings, the system comprising:
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a pulse generator for producing a changing current flow in the wound field rotor winding to induce a response signal in each of the wye-connected stator windings;
a sensors coupled to the wye-connected stator windings for measuring response signals in the wye-connected stator windings; and
an analyzer coupled to the sensors for analyzing polarities and magnitudes of the induced signals in the sensed windings to compute the rotor position. - View Dependent Claims (19, 20)
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Specification