Device for controlling the electrical power supply of a stepping motor and stepping motor equipped with such a device
First Claim
1. Device for controlling the electrical power supply of a stepping motor having a rotor and a stator with a plurality of phases, comprising a plurality of switches each controlling a power supply from an electrical energy source to a respective phase of the stator, detecting means for detecting a simultaneous ceasing of conduction in all of the phases, and controlling means operatively connected to and excited by said detecting means, said controlling means causing conduction of one of the phases for holding the rotor with a predetermined holding torque established by the one phase.
2 Assignments
0 Petitions
Accused Products
Abstract
The device comprises transistors (T1, T2, T3, T4) each connected in series with one of the phases (φ1, φ2, φ3, φ4) of the stator of the motor in order to control its power supply by an electrical energy source (+VBAT). Means (D1, D2, D3, D4) are provided for detecting the simultaneous stopping of conduction in all of the phases and to then control the return to conduction of one of the phases (φ4), by an appropriate control of a transistor (T5), in order to lock the rotor with a predetermined holding torque established by this phase. Thus, in the case of a failure of the control of the phases of the motor, the motor remains substantially immobile even if it is subject to the action of a parasitic or resisting torque.
Application to a motor for controlling the butterfly valve for the gases of an internal combustion engine.
13 Citations
15 Claims
- 1. Device for controlling the electrical power supply of a stepping motor having a rotor and a stator with a plurality of phases, comprising a plurality of switches each controlling a power supply from an electrical energy source to a respective phase of the stator, detecting means for detecting a simultaneous ceasing of conduction in all of the phases, and controlling means operatively connected to and excited by said detecting means, said controlling means causing conduction of one of the phases for holding the rotor with a predetermined holding torque established by the one phase.
- 11. In a stepping motor having a rotor, a stator with a plurality of phases, and a plurality of switches each associated with a respective one of the phases for controlling electrical power supply to the phases, a device for controlling the stepping motor by controlling the electrical power supply of the stepping motor, comprising detecting means for detecting a simultaneous ceasing of conduction in all of the phases, and controlling means operatively connected to and excited by said detecting means, said controlling means causing conduction of one of the phases for holding the rotor with a predetermined holding torque established by the one phase.
Specification