Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1998-08-13
1999-12-28
Masih, Karen
Electricity: motive power systems
Switched reluctance motor commutation control
318138, 318439, H02K 2300
Patent
active
060086025
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an arrangement comprising an electronically commutated motor having a permanent magnet rotor and which is, in operation, supplied with a DC voltage from an alternating current (AC) main by way of a rectifier connected to this main and by way of a DC link connected to this rectifier.
BACKGROUND
Motors of this kind have been disclosed by EP 0 467 085 A1, Hans et al. or DE-UM 9 414 498.2. In these motors, their electronics must be supplied, via a separate power supply from the AC main, with a suitable low voltage, e.g. a DC voltage of 5 or 12 V.
From this, the problem arises that, upon a short interruption of the main voltage or after an electronically commutated motor of this kind is switched off, its electronics quickly are rendered currentless and therefore can assume erratic switching states, while the motor itself continues to rotate and thus feeds energy back into the DC link. This can lead to the destruction of electronic components of the motor, particularly in motors that are supplied with current via a full bridge circuit.
It is, therefore, one object of the invention to provide a new arrangement with an electronically commutated motor.
SUMMARY OF THE INVENTION
According to the invention, this object is accomplished by providing an alternative power source to the electronic control circuit and adding diodes in the full bridge circuit. One thus obtains that, directly after the motor is switched on, as well as after the motor is switched off, or after a current failure, the electronic circuits of the motor are supplied with energy from the DC link via a series controller, so that the commutation of the motor is reliably assured down to low speeds and the motor comes to a stop with no trouble. The series controller is only activated when the voltage at said output mentioned is no longer high enough, so that unnecessary electrical losses in the series controller are prevented, and a favorable efficiency of the motor results.
BRIEF FIGURE DESCRIPTION
Other details and advantageous improvements of the invention ensue from the exemplary embodiments, which are described below, are represented in the drawings, and are in no way to be understood as a limitation of the invention, as well as from the remaining subclaims.
FIG. 1 shows a block circuit diagram of an arrangement according to the invention,
FIG. 2 is a depiction analogous to FIG. 1, but with additional details of the circuit, and
FIG. 3 is a depiction of an electronically commutated motor that is operated by means of a full bridge circuit (H-bridge).
DETAILED DESCRIPTION
FIG. 1 shows an arrangement according to the invention in the form of a block circuit diagram. This includes an electronically commutated motor (ECM) 10, which is represented here with a single winding phase or strand 11 and is supplied with current by way of a power output stage 12 (full bridge circuit, see FIG. 3). The motor 10 has a permanent magnet rotor 14, which is schematically represented here as a two-pole rotor, and in whose vicinity is located a rotor position sensor 16, usually a Hall generator (Hall IC). The rotor position sensor 16 is supplied with a low DC voltage of, for example, 12 V, and then supplies a digital output signal Hall to a commutation control unit 18. This unit likewise requires, for its operation, this low DC voltage of, for example, 12 V. The commutation control unit 18 can, for example, be supplied with a signal DIR that controls the rotation direction of the motor 10 and according to FIG. 3, the unit can emit a signal at its output 20, with which it interrupts the current supply of the motor 10 by way of two AND gates 22, 24 in order, for example, to control the speed of the motor or to limit its current.
The arrangement depicted in FIG. 1 is supplied with current from an alternating current (utility) main, to which it can be connected by means of two connections 28, 30. A ground connection of the alternating current main is designated PE. The connection is carried out via a filter 31. Acc
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Masih Karen
Papst-Motoren GmbH & Co. KG
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