Electricity: motive power systems – Limitation of motor load – current – torque or force
Reexamination Certificate
2006-01-03
2006-01-03
Masih, Karen (Department: 2837)
Electricity: motive power systems
Limitation of motor load, current, torque or force
C318S132000, C318S254100
Reexamination Certificate
active
06982534
ABSTRACT:
The invention concerns a method for operating an electronically commutated motor (10) that is equipped with a current limiting arrangement which acts on a PWM controller (56). The latter, in operation, delivers PWM pulses (60) having a controllable pulse duty ratio (pwm) and a substantially constant frequency. In the event a predetermined upper limit value (Isoll; Iw) of the motor current (Iist) is exceeded, the current limiting arrangement effects a change in this pulse duty factor (pwm) in order to reduce the motor current (Iist). If the motor current (Iist) exceeds a predetermined upper limit value (Isoll; Iw) while the motor (10) is rotating, that limit value (Isoll; Iw) is raised by a timing member (260) during a predetermined time span (304) (FIG.8: Iwmax), so that the available motor power is temporarily raised in the context of a load peak. If the rotor (24) is stalled, the limit value (Isoll) is not raised but instead is greatly lowered. The limit value (Isoll) is preferably raised as a function of the rotation speed of the motor (10) in order to utilize the improved motor cooling at high rotation speeds. At start-up of the motor (10), the limit value (Isoll) is briefly increased to a high value in order to enable dependable starting.
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Hahn Alexander
Heydrich Walter
Rappenecker Hermann
ebm-papst St. Georgen GmbH & Co. KG
Masih Karen
Oliver, Esq. Milton
Ware Fressola Van Der Sluys & Adolphson LLP
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