Electric motor control system
AssigneeAnalog Devices International Unlimited Company
InventorThomas Ernst
Life of this patent
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Abstract
A new method and circuit arrangement for operating an electric motor, such as a stepper motor, in a control loop for preventing motor stall, the electric motor comprising at least a first motor coil and a second motor coil, the method comprising: operating the electric motor at a velocity equal to the target velocity; receiving a load value associated with an electric motor load; and determining whether the load value is greater than a load value threshold. Based on a determination that the load value is greater than the load value threshold decreasing the velocity of the electric motor to a velocity less than the target velocity.
Claims18
A method of operating an electric motor in a control loop, the electric motor comprising at least a first motor coil and a second motor coil, the method comprising:
- operating the electric motor at a velocity equal to a target velocity;
- receiving a load value associated with an electric motor load;
- determining whether the load value is greater than an upper load value threshold;
- decreasing the velocity of the electric motor to less than the target velocity based on the load value being greater than the upper load value threshold;
- determining whether the load value is less than a lower load value threshold;
- and
- increasing the velocity of the electric motor to the target velocity based on the load value being less than the lower load value threshold.
A circuit arrangement for operating an electric motor in a control loop, the electric motor comprising a first motor coil and a second motor coil, the circuit arrangement comprising a control unit configured to:
- operate the electric motor at a velocity equal to a target velocity;
- receive a load value associated with an electric motor load;
- determine whether the load value is greater than an upper load value threshold;
- decrease the velocity of the electric motor to less than the target velocity based on the load value being greater than the upper load value threshold;
- determine whether the load value is less than a lower load value threshold;
- and
- increase the velocity of the electric motor to the target velocity based on the load value being less than the lower load value threshold and the upper load value threshold.
Dependencies are inferred from the claim text.