Method and system controlling an electrical motor with temperature compensation
First Claim
1. A method for controlling an electrical motor comprising a rotor with associated magnets and a stator, the method comprising:
- estimating a change in temperature of the magnets associated with the rotor of the motor based on an operational magnetic flux strength that is compared to a reference magnetic flux strength determined at a known ambient temperature and for a predetermined operating range of the motor;
establishing a relationship between the estimated change in the temperature and a magnetic torque component of a target output torque of the motor consistent with the predetermined operating range; and
adjusting a command for the motor to compensate for shaft torque variation associated with the estimated change in the temperature in conformance with the established relationship.
1 Assignment
0 Petitions
Accused Products
Abstract
A temperature estimation module estimates a change in temperature of the magnets associated with the rotor of the motor based on an operational magnetic flux strength that is compared to a reference magnetic flux strength determined at a known ambient temperature and for a predetermined operating range of the motor The temperature estimation module or the system establishes a relationship between the estimated change in the temperature and a magnetic torque component of a target output torque of the motor consistent with the predetermined operating range. The current adjustment module or the system adjusts a command (e.g., quadrature-axis current command) for the motor to compensate for shaft torque variation associated with the estimated change in the temperature in conformance with the established relationship.
24 Citations
20 Claims
-
1. A method for controlling an electrical motor comprising a rotor with associated magnets and a stator, the method comprising:
-
estimating a change in temperature of the magnets associated with the rotor of the motor based on an operational magnetic flux strength that is compared to a reference magnetic flux strength determined at a known ambient temperature and for a predetermined operating range of the motor; establishing a relationship between the estimated change in the temperature and a magnetic torque component of a target output torque of the motor consistent with the predetermined operating range; and adjusting a command for the motor to compensate for shaft torque variation associated with the estimated change in the temperature in conformance with the established relationship. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A system for controlling an electrical motor, where the motor comprises a rotor with associated magnets and a stator, the system comprising:
-
a data processor for estimating a change in temperature of the magnets associated with the rotor of the motor based on an operational magnetic flux strength that is compared to a reference magnetic flux strength determined at a known ambient temperature and for a predetermined operating range of the motor; a temperature estimation module for establishing a relationship between the estimated change in the temperature and a magnetic torque component of a target output torque of the motor consistent with the predetermined operating range; and a current adjustment module for adjusting a command for the motor to compensate for shaft torque variation associated with the estimated change in the temperature in conformance with the established relationship. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification