Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means
Patent
1995-04-21
1996-08-13
Sircus, Brian
Electricity: motive power systems
Positional servo systems
With particular 'error-detecting' means
318146, B60R 1602
Patent
active
055459617
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an electric motor drive having a first section which contains a control circuit or arrangement and an evaluation circuit or arrangement, a second section which is offset with respect to the first section and contains an electric motor and a sensor arrangement, two electrical lines or wires which connect the control arrangement and the electric motor for supplying power to the electric motor, and at least one further line or wire connecting the evaluation arrangement and the sensor arrangement for transmitting an information signal provided by the sensor arrangement to the evaluation arrangement. German Utility Model 90 12 217.8 discloses an arrangement which contains an electric motor drive for opening and closing windows in a motor vehicle. A central device, which has control and evaluation circuit or arrangements, is connected to a plurality of drive units which are arranged in the doors of the motor vehicle. The drive units contain an electric motor and a sensor arrangement. The sensor arrangement detects a rotational speed of the drive. Provided between the central device and each drive unit are five connecting lines of or wires for signal transmission and energy transmission.
It is the object of the invention to simplify the cabling complexity in an electric motor drive having a first section, which contains a control circuit or arrangement and an evaluation circuit or arrangement, and having a second section, which is offset with respect to the first section and contains an electric motor arrangement and a sensor arrangement.
SUMMARY AND ADVANTAGES OF THE INVENTION
The above object is generally achieved by an electric motor drive according to the invention which has the advantage that only three connecting lines are required between the first and the second sections. Two of these lines connect the control arrangement contained in the first section to the electric motor contained in the second section. A third line connects the evaluation arrangement contained in the first section to the sensor arrangement contained in the second section.
In accordance with a preferred first embodiment of the electric motor drive according to the invention, the power supply of the sensor arrangement is provided via the third line and via at least one of the lines leading to the electric motor. Signal transmission takes place via the third line. The sensor arrangement prescribes the current flowing via the third line as a function of a sensor signal. The current flowing via the third line is therefore composed of the current for the power supply of the sensor arrangement and of the current prescribed for signal transmission.
The advantage of the first embodiment resides in that in the event of a prescribed short circuit of the electric motor, which the control arrangement can trigger for the purpose of rapid braking of the electric motor, the power supply of the sensor circuit arrangement can be ensured via the power supply lines leading to the motor without further measures. An energy store which is possibly provided and which is assigned to the sensor arrangement can therefore be of small dimensions or be completely eliminated,
Advantageous developments and improvements of the first embodiment of the electric motor drive according to the invention follow from subclaims.
In an advantageous development, it is provided that the sensor arrangement is connected via two rectifier diodes to the two lines leading to the electric motor. It is possible by means of this measure to conduct the required potential of the power supply both via the one and via the other line leading to the motor. The direction of rotation of the electric motor can thus be changed over.
In a further advantageous development, a circuit is provided for the purpose of increasing the voltage in the evaluation circuit or arrangement. The circuit increases the voltage, and thus the power supply voltage supplied to the third line, with respect to the operating voltage of the electric motor. It is possible by means of this measure
REFERENCES:
patent: 4810941 (1989-03-01), Ohishi et al.
patent: 5299277 (1994-03-01), Fujii
Aab Volker
Haderer Guenter
Peter Cornelius
Seiler Hartmut
Robert & Bosch GmbH
Sircus Brian
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