CONTROLLER FOR ELECTRIC MOTOR
First Claim
Patent Images
1. A controller for an electric motor, said controller controlling a synchronous motor, said controller comprising:
- an electric motor drive unit that applies a voltage based on a voltage command to said synchronous motor;
a feedback amount calculation unit that decides a feedback amount based on a deviation of a current flowing through said synchronous motor from a command value of said current or a deviation of an air-gap flux in said synchronous motor from a command value of said air-gap flux;
a voltage command generation unit that generates said voltage command on the basis of said feedback amount;
a voltage error calculation unit that calculates a range in which an error between a voltage value based on a voltage equation of said synchronous motor and said voltage command varies; and
a determination unit that determines an occurrence of an abnormality in said synchronous motor when said feedback amount deviates from the range in which said error varies.
1 Assignment
0 Petitions
Accused Products
Abstract
A feedback amount calculation unit uses a deviation of a current from its command value or a deviation of an air-gap flux from its command value to calculate a feedback amount. A voltage error calculation unit calculates a variation range of a voltage error between a voltage value based on a voltage equation of the electric motor and a voltage command. The presence or absence of step-out of the electric motor is determined by comparison between the variation range of the voltage error and the feedback amount.
12 Citations
9 Claims
-
1. A controller for an electric motor, said controller controlling a synchronous motor, said controller comprising:
-
an electric motor drive unit that applies a voltage based on a voltage command to said synchronous motor; a feedback amount calculation unit that decides a feedback amount based on a deviation of a current flowing through said synchronous motor from a command value of said current or a deviation of an air-gap flux in said synchronous motor from a command value of said air-gap flux; a voltage command generation unit that generates said voltage command on the basis of said feedback amount; a voltage error calculation unit that calculates a range in which an error between a voltage value based on a voltage equation of said synchronous motor and said voltage command varies; and a determination unit that determines an occurrence of an abnormality in said synchronous motor when said feedback amount deviates from the range in which said error varies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
Specification