Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Field control – or field and armature control – by analog...
Reexamination Certificate
2007-03-06
2007-03-06
Ip, Paul (Department: 2837)
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Field control, or field and armature control, by analog...
C388S833000, C388S804000, C318S432000, C318S449000
Reexamination Certificate
active
10842040
ABSTRACT:
The invention relates to a circuit and a method for the speed control of a d.c. motor, particularly the speed control of a fan driven by this d.c. motor, which is used as part of an air distribution system in passenger and commercial motor vehicles. The circuit for the speed control of a d.c. motor includes, according to the invention, a d.c. motor and a supply voltage supplying this d.c. motor, a control module for the generation of PWM-signals and registration of measurement currents and measurement voltages, a number n of parallel-connected field effect transistors which are designed suppliable with PWM-signals in a cascade manner to switch the d.c. motor, and a number n−1 resistors which are designed each to be connected with one of the n field effect transistors which are designed each to be connected with one of the n field effect transistors, whereby n is at least 2.
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Brinks Hofer Gilson & Lione
Ip Paul
Visteon Global Technologies Inc.
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