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Copyright © 2001, MCB UP Limited
Hall sensor for motor speed
Hall sensor for motor speedKeywords: Sensors, Motors
Applicant: Robert Bosch GmbH (DE)Patent number: US6127752Publication date: 3 October 2000Title: Motor with rpm pickup via a Hall sensor
The invention is based on a motor in which signals from a shaft are picked up by means of a Hall sensor. One such motor is a direct current motor with a commutator, and a motor housing and a rotor drivable in two rotational directions. The rotor shaft is supported in two bearing end plates that close off the motor housing on two sides. A two-pole magnet rotor body is fixedly mounted on the rotor shaft. A Hall sensor is disposed on a circuit board embodied as an assembly component, which is plugged from outside into a recess of the bearing end plate. The recess has a bottom face that has a closed, indented chamber. The chamber protrudes from the inside of the bearing end plate and has a chamber wall facing the magnet rotor body. The Hall sensor is disposed behind the chamber wall at the level of the magnet rotor body and senses signals of the magnet rotor body. On the front side of the circuit board, pointing toward the magnet rotor body, electrical components are provided, such as a Hall sensor, resistor, etc. In the region of their terminal ends, power supply lines and signal lines of the electrical components are guided from the front to the back of the circuit board through recesses of the circuit board; the stripped terminal ends are inserted through openings from the front to the back of the circuit board so as to be contacted with conductor tracks on the back. The power supply lines and signal lines are guided through an insulating sleeving and are connected to a push-on sleeve housing that forms an assembly unit with the circuit board. The motor is used in particular in motor vehicles as a drive motor for raising windows, actuating a sunroof, adjusting seats and mirrors, and so forth. Especially in these applications, there is a need for a small, lightweight construction.