Braking of single coil BLDC motors
AssigneeMelexis Bulgaria Ltd
InventorsDirk Leman, Dimitar Vladimirov Todorov
Life of this patent
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Abstract
A method for braking a single coil BLDC motor includes iterating a plurality of times through a sequence of: a braking state which lasts a braking period; and a high impedance state which lasts a cool down period. The current runs through the single coil during the braking state and no current runs through the single coil during the high impedance state. The transiting from the braking state to the high impedance state is done when the motor operates in generator mode.
Claims14
A method for braking a single coil BLDC motor, the method comprising iterating a plurality of times through a sequence of:
- a braking state which lasts a braking period, and
- a high impedance state which lasts a cool down period, wherein current runs through the single coil during the braking state and wherein no current runs through the single coil during the high impedance state,
- wherein transiting from the braking state to the high impedance state is done when the motor operates in generator mode, and
- wherein transiting from the high impedance state to the braking state is done when the ratio of the cool down period and the braking period is at least 5%.
A motor driver for driving a single coil BLDC motor, the motor driver comprising:
- a controller,
- a full bridge output driver comprising a pair of high side transistors and a pair of low side transistors connected with the single coil for controlling a current through the coil,
- wherein the controller is configured for switching the transistors of the full bridge driver for braking the motor, thereby iterating a plurality of times through a sequence of a braking state which lasts a braking period and a high impedance state which lasts a cool down period, wherein current runs through the single coil during the braking state and wherein no current runs through the single coil during the high impedance state and wherein transiting from the braking state to the high impedance state is done when the motor operates in generator mode and wherein transiting from the high impedance state to the braking state is done when the ratio of the cool down period and the braking period is at least 5%.
Dependencies are inferred from the claim text.