View source for 17851755. Method and System for Active Detection of Rotor Magnet Temperature simplified abstract (Ford Global Technologies, LLC)

=Method and System for Active Detection of Rotor Magnet Temperature=


==Organization Name==

[[:Category:Ford Global Technologies, LLC|Ford Global Technologies, LLC]]


[[Category:Ford Global Technologies, LLC]]

==Inventor(s)==

[[:Category:Jonathan Hair of Royal Oak MI (US)|Jonathan Hair of Royal Oak MI (US)]][[Category:Jonathan Hair of Royal Oak MI (US)]]

[[:Category:Yingfeng Ji of Northville MI (US)|Yingfeng Ji of Northville MI (US)]][[Category:Yingfeng Ji of Northville MI (US)]]

[[:Category:Matthew Penne of Hadar NE (US)|Matthew Penne of Hadar NE (US)]][[Category:Matthew Penne of Hadar NE (US)]]

==Method and System for Active Detection of Rotor Magnet Temperature - A simplified explanation of the abstract==


This abstract first appeared for US patent application 17851755 titled 'Method and System for Active Detection of Rotor Magnet Temperature

==Simplified Explanation==

The abstract of the patent application describes a controller that can detect the temperature of a rotor magnet in a motor by actively detecting the back electromotive force (BEMF) voltage. The controller achieves this by injecting a known quantity of current into the motor's d-axis while the motor is spinning but not producing any torque. By using a quadrature-axis voltage equation, the controller can solve for the BEMF voltage using the known voltage command, current, and q-axis reactance. The rotor magnet temperature is then determined based on the BEMF voltage.

* The controller detects rotor magnet temperature based on actively detected BEMF voltage.
* It injects a known quantity of current into the motor's d-axis while the motor is spinning but not producing torque.
* The BEMF voltage is determined using a quadrature-axis voltage equation.
* The known voltage command, current, and q-axis reactance are used to solve for the BEMF voltage.
* The rotor magnet temperature is then determined based on the BEMF voltage.

==Potential Applications==
* Motor temperature monitoring and control in various industries such as automotive, manufacturing, and robotics.
* Improved efficiency and performance of motors by allowing real-time temperature monitoring.

==Problems Solved==
* Accurate and real-time detection of rotor magnet temperature in motors.
* Elimination of the need for additional temperature sensors or probes.
* Enhanced control and protection of motors by monitoring temperature.

==Benefits==
* Cost-effective solution for temperature monitoring in motors.
* Improved motor performance and efficiency.
* Early detection of overheating or potential failures.
* Simplified motor control system without the need for additional temperature sensors.


==Original Abstract Submitted==

A controller detects a rotor magnet temperature based on an actively detected back electromotive force (BEMF) voltage of the motor. The controller detects the BEMF voltage by commanding the injection of a direct-axis (d-axis) current into the motor while the motor is spinning but otherwise commanding no torque. The controller actively detects the BEMF voltage in that the controller purposely injects a known quantity of d-axis current at a chosen time during which the controller detects or is aware that the motor is commanding no torque. Using a quadrature-axis (q-axis) voltage equation, which describes the relationship between a voltage command, the current, the BEMF voltage, and reactance in the q-axis, the controller solves for the BEMF voltage with the voltage command, the current, and the q-axis reactance being known to the controller. The controller detects the rotor magnet temperature based on the BEMF voltage.



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