Device with an electromotor

Details Device with an electromotor Device with an electromotor

2000-12-12

2004-11-30

Leykin, Rita (Department: 2837)

Electricity: motive power systems

Limitation of motor load, current, torque or force

C318S254100, C318S132000, C318S434000, C388S900000, C388S903000, C388S904000

Reexamination Certificate

active

06825625

ABSTRACT:

FIELD OF THE INVENTION
The invention concerns an arrangement having an electric motor, and in particular having an electronically commutated motor (ECM).
BACKGROUND
Examples of such motors are shown, for example, in the following documents [of the Applicant] assigned to the assignee of the present application:
DE 44 41 372 A1 =
5,845,045 JESKE
EP 0 658 973 B1 =
5,590,235 JESKE
DE 296 06 939.6-U =
EP 0 739 084 A2
DE 195 15 944 A1
EP 0 741 449 A1 =
6,163,117
EP 0 744 807 B1 =
5,847,523
DE 195 18 991 A1
DE 196 47 983 A1 =
6,091,887
EP 0 780 962 A2
It would not be possible to reproduce the extensive content of these documents even in summarized form, and reference is therefore made to their complete contents.
SUMMARY OF THE INVENTION
It is an object of the invention to make available a new arrangement and a new method for controlling an electric motor.
According to the invention, this object is achieved by connecting an output signal of a microprocessor, which can take on either a high level or a low level, to a voltage divider which regulates motor current, and varying the microprocessor output signal to achieve a desired motor current characteristic curve. [the subject matter of claim
1
]. It is possible thereby, in program-controlled fashion, either to extend acceleration (called a “soft start”) or to make acceleration as short as possible by raising the operating point for the current control system during the acceleration period so that the motor current can be higher during acceleration than later in normal operation.
A preferred method is to set a motor current limit to a first value for motor startup, to monitor the startup, and to reset the motor current limit to a second value after startup. [the subject matter of claim
11
]. This method can be flexibly adapted to the needs of a user, since the limiting values can be adjusted in program-controlled fashion.
Another manner of achieving the stated object is the subject matter of claim
23
. In this fashion, it is easily possible to adapt this kind of arrangement having an electric motor to the needs of its user by entering the desired values via the interface into the nonvolatile memory element of the arrangement (or reading it out from said memory element). This applies in principle to all motor values, e.g. rotation speed, current limiting values, temperature, acceleration time, torque at rest, and others. The storage operation can be accomplished at the factory or at a later point in time in order to adapt the motor optimally to a customer's needs. This is particularly advantageous for motors that drive a fan, since with such fans the needs of users can be very different, and a fan arrangement of this kind can very easily be optimized for a user's needs, as depicted for example in FIG.
22
.
Further details and advantageous developments of the invention are evident from the exemplary embodiments described below and depicted in the drawings (and to be understood in no way as a limitation of the invention).


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