Driver and method for low inductance motor
AssigneeMelexis Bulgaria Ltd
InventorsDirk Leman, Xing Zuo
Life of this patent
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Abstract
A brushless DC motor system, includes a single coil brushless DC motor and a driver for driving the single coil brushless DC motor. The brushless DC motor system has a maximum time constant τmax. The driver comprises a control unit which is adapted for driving the brushless DC motor at a constant speed and at a variable speed by applying a PWM driving signal to the coil of the brushless DC motor with a PWM frequency larger than a ratio defined by a constant/τmax wherein the ratio is such that a current through the coil is always bigger than a pre-defined undercurrent limit.
Claims16
A brushless DC motor system, comprising a single coil brushless DC motor and a driver for driving the single coil brushless DC motor, wherein the brushless DC motor system has a maximum time constant τmax, the driver comprising a control unit which is adapted for driving the brushless DC motor at a constant speed and/or at a variable speed by applying a PWM driving signal to the coil of the brushless DC motor with a PWM frequency larger than a ratio defined by a constant/τmax wherein the ratio is such that a current through the coil is always bigger than a pre-defined undercurrent limit.
A method for controlling a single coil brushless DC motor in a brushless DC motor system which has a maximum time constant τmax, the method comprising applying a PWM driving signal to the coil of the brushless DC motor with a PWM frequency larger than a ratio defined by a constant/τmax wherein the ratio is such that a current through the coil is always bigger than a pre-defined undercurrent limit.
Dependencies are inferred from the claim text.