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US 2003/0155877 A1Published application
Method and device for detecting the motor position of an electric motor
AssigneeInfineon Technologies AG
InventorsJens Barrenscheen, Marcus Nuebling
Life of this patent
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Abstract
A method and device for detecting the motor position of a DC motor includes evaluating the back-induced voltage of non-energized motor windings of the motor only during predetermined time durations whose temporal position and duration are derived from drive signals for half-bridge circuits that are connected to the motor windings.
Claims30
A method for detecting a motor position of a motor having at least two motor windings and at least two terminals for the motor windings, which comprises:
- connecting the motor to a drive circuit having a number of switch configurations corresponding to a number of the motor windings, each of the switch configurations having at least one switch and an output terminal;
- connecting each of the terminals of the motor to an output terminal of a respective one of the switch configurations;
- providing drive signals assuming one of a first level and a second level to the at least one switch of the switch configurations, the at least one switch of the switch configurations being in one of an on state and an off state dependent upon a level of the drive signals;
- subjecting the first and second levels of the drive signals to a mutually coordinated temporal change;
- and
- detecting the motor position by evaluating potentials at the at least two terminals of the motor only during predetermined time periods having a temporal position and a duration derived from the drive signals.
3 more elements
An evaluation circuit for detecting a motor position of a motor having a number of motor windings including at least two motor windings and at least two terminals for the motor windings, the at least two terminals having potentials, comprising:
- a drive circuit to be connected to the motor, said drive circuit having a number of switch configurations corresponding to the number of the motor windings, each of said switch configurations having:
- at least one switch having an on state and an off state;
- and
- an output terminal;
- said output terminal of a respective one of said switch configurations to be connected to each of the at least two terminals of the motor;
- drive signals assuming one of a first level and a second level;
- said at least one switch of said switch configurations being in one of said on and off states dependent upon a level of said drive signals;
- and
- at least one logic circuit providing at least one output signal dependent upon at least one of the potentials present at the at least two terminals and said drive signals.
6 more elements
An evaluation circuit for detecting a motor position, comprising:
- a motor having:
- a number of motor windings including at least two motor windings;
- and
- at least two terminals for said at least two motor windings, said at least two terminals having potentials;
- a drive circuit connected to said motor, said drive circuit having a number of switch configurations corresponding to said number of said motor windings, each of said switch configurations having:
- at least one switch having an on state and an off state;
- and
- an output terminal;
- said output terminal of a respective one of said switch configurations connected to each of said at least two terminals of said motor;
- drive signals assuming one of a first level and a second level;
- said at least one switch of said switch configurations being in one of said on and off states dependent upon a level of said drive signals;
- and
- at least one logic circuit providing at least one output signal dependent upon:
- at least one of said potentials present at said at least two terminals;
- and
- said drive signals.
13 more elements
In a motor configuration with a motor having:
- motor positions;
- a number of motor windings including at least two motor windings;
- and
- at least two terminals for the at least two motor windings, the at least two terminals having potentials;
- an evaluation circuit for detecting the motor position, comprising:
- a drive circuit connected to the motor, said drive circuit having a number of switch configurations corresponding to the number of the motor windings, each of said switch configurations having:
- at least one switch having an on state and an off state;
- and
- an output terminal;
- said output terminal of a respective one of said switch configurations connected to each of the at least two terminals of the motor;
- drive signals assuming one of a first level and a second level;
- said at least one switch of said switch configurations being in one of said on and off states dependent upon a level of said drive signals;
- and
- at least one logic circuit providing at least one output signal dependent upon at least one of the potentials present at the at least two terminals and said drive signals.
11 more elements
Dependencies are inferred from the claim text.