METHOD AND DEVICE FOR OPERATING A BRUSHLESS MOTOR
First Claim
1. A method for operating a brushless electric motor, the windings (U, V, W) of which are controlled by an AC converter with the aid of six switches, wherein the AC converter comprises three outputs that are allocated to the windings (U, V, W) of the electric motor and wherein a power semiconductor switch is arranged in each case between the outputs of the AC converter and the windings (U, V, W) and wherein a detection unit for detecting defective switches, a unit for measuring the voltage at the outputs of the AC converter and a motor position angle sensor for determining the motor position angle is provided, wherein the AC converter is switched off following the detection of a defective switch in such a manner that power is no longer introduced into the windings (U, V, W) of the electric motor and that the motor position angle sensor opens the power semiconductor switches in succession in a previously defined motor position angle (φ
- U, φ
V, φ
W).
1 Assignment
0 Petitions
Accused Products
Abstract
A method and device for operating a brushless electric motor, having windings controlled by an inverter using six switches. The inverter includes three outputs that are associated with the windings of the electric motor. A respective power semiconductor switch is arranged between the outputs of the inverter and the windings, and wherein a detection unit detects defective switches, a measuring unit measures the voltage at the outputs of the inverter, and a motor angle position sensor determines the motor angle position arc. The invention further relates to a device for operating a brushless electric motor. The inverter is switched off after a defective switch has been detected, such that no additional power is introduced in the windings of the electric motor. The motor angle position sensor consecutively opens the power semiconductor switches in a predetermined motor angle position.
12 Citations
10 Claims
-
1. A method for operating a brushless electric motor, the windings (U, V, W) of which are controlled by an AC converter with the aid of six switches, wherein the AC converter comprises three outputs that are allocated to the windings (U, V, W) of the electric motor and wherein a power semiconductor switch is arranged in each case between the outputs of the AC converter and the windings (U, V, W) and wherein a detection unit for detecting defective switches, a unit for measuring the voltage at the outputs of the AC converter and a motor position angle sensor for determining the motor position angle is provided, wherein the AC converter is switched off following the detection of a defective switch in such a manner that power is no longer introduced into the windings (U, V, W) of the electric motor and that the motor position angle sensor opens the power semiconductor switches in succession in a previously defined motor position angle (φ
- U, φ
V, φ
W). - View Dependent Claims (2, 3, 4, 5)
- U, φ
-
6. A device for operating a brushless electric motor, the windings (U, V, W) of which are controlled by an AC converter with the aid of six switches, wherein the AC converter comprises three outputs that are allocated to the windings (U, V, W) of the electric motor and wherein a power semiconductor switch is arranged in each case between the outputs of the AC converter and the windings (U, V, W) and wherein a detection unit for detecting defective switches, a unit for measuring the voltage at the outputs of the AC converter and a motor position angle sensor for determining the motor position angle (φ
- ) is provided, wherein the AC converter is switched off after the detection of a defective switch by the microcontroller in such a manner that power is no longer introduced into the windings (U, V, W) of the electric motor and that the motor position angle sensor is designed so as to open the power semiconductor switches in succession in a previously defined motor position angle (φ
U, φ
V, φ
W). - View Dependent Claims (7, 8, 9, 10)
- ) is provided, wherein the AC converter is switched off after the detection of a defective switch by the microcontroller in such a manner that power is no longer introduced into the windings (U, V, W) of the electric motor and that the motor position angle sensor is designed so as to open the power semiconductor switches in succession in a previously defined motor position angle (φ
Specification