Method and apparatus for controlling an electric motor

Details Method and apparatus for controlling an electric motor Method and apparatus for controlling an electric motor

H - Electricity

02

P

H02P 7/00 (2006.01) B60L 15/20 (2006.01) G05D 13/62 (2006.01)

Patent

CA 2558536

The present invention provides a method for controlling the output power of a permanent magnet electric motor (102) using a control means (106). The control means (106) includes a means (134) for measuring motor speed (134) and motor phase current (134), and a means for controlling motor phase current (110) to a desired level. A known relationship between motor phase current and motor torque is then employed by a torque controller so that motor shaft torque can be controlled. A power limiting means (128) then limits the output mechanical power of the motor by dividing a limit value of power by the motor speed to produce a maximum allowable torque setting for that speed.

La présente invention concerne un procédé de commande de la puissance de sortie d'un moteur électrique à aimant permanent (102) au moyen d'un dispositif de commande (106). Ledit dispositif (106) comprend des moyens de mesure (134) du régime moteur et du courant de phase du moteur, et des moyens de réglage du courant de phase du moteur (110) au niveau voulu. Une unité de commande de couple applique alors un rapport courant de phase moteur/couple du moteur pour commander le couple moteur. Des moyens de limitation de puissance (128) limitent ensuite la puissance mécanique de sortie du moteur en divisant une valeur limite de puissance moteur par le régime moteur, ce qui permet d'obtenir le réglage de couple maximum admissible pour ce régime.

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