Motor driving device and steering system
AssigneeDenso Corporation
InventorsGo ENDOH, Masaya TAKI, Hiroyasu OTAKE
Life of this patent
Estimating the term…
Abstract
In a motor driving device, a current detector detects a value of the motor current, and a limit variable calculator calculates a calculation value of a limit variable for limiting the command current. A determiner determines, based on a relationship between the value of the motor current and the calculation value of the limit variable, whether the motor current is in a less-response situation to change of the command current. A current limiter determines whether to limit a value of the command current based on the calculation value of the limit variable in accordance with a result of the determination of whether the motor current is in the less-response situation to change of the command current.
Claims14
A motor driving device for controlling, based on a variable command current, a motor current to be supplied to a motor to thereby drive the motor, the motor driving device comprising:
- a current detector configured to detect a value of the motor current;
- a limit variable calculator configured to calculate a calculation value of a limit variable for limiting the command current;
- a determiner configured to determine, based on a relationship between the value of the motor current and the calculation value of the limit variable, whether the motor current is in a less-response situation to change of the command current;
- and
- a current limiter configured to determine whether to limit a value of the command current based on the calculation value of the limit variable in accordance with a result of the determination of whether the motor current is in the less-response situation to change of the command current.
A steering system comprising:
- a motor;
- and
- a motor driving device for controlling, based on a variable command current, a motor current to be supplied to the motor to thereby drive the motor, the motor driving device comprising:
- a current detector configured to detect a value of the motor current;
- a limit variable calculator configured to calculate a calculation value of a limit variable for limiting the command current;
- a determiner configured to determine, based on a relationship between the value of the motor current and the calculation value of the limit variable, whether the motor current is in a less-response situation to change of the command current;
- and
- a current limiter configured to limit a value of the command current based on the calculation value of the limit variable in accordance with a result of the determination of whether the motor current is in the less-response situation to change of the command current.
A motor driving device for controlling, based on a variable command current, a motor current to be supplied to a motor to thereby drive the motor, the motor driving device comprising:
- a current detector configured to detect a value of the motor current;
- a limit variable calculator configured to calculate a calculation value of a limit variable for limiting the command current;
- a first determiner configured to determine whether an absolute value of the value of the command current is larger than an absolute value of the value of the limit variable;
- a second determiner configured to determine, based on a relationship between the value of the motor current and the calculation value of the limit variable, whether the motor current is in a less-response situation to change of the command current;
- and
- a current limiter configured to determine whether to limit the command current to the calculation value of the limit variable in accordance with a first result of determination by the first determiner and a second result of determination by the second determiner.
Dependencies are inferred from the claim text.