Electric motor based holding control systems and methods
First Claim
1. A holding system comprising:
- a force control module configured to generate a force signal to cause a holding device to perform at least one of a hold stroke and a release stroke, wherein the hold stroke includes transitioning a gripping element of the holding device to a first position to grip an object, wherein the release stroke includes transitioning the gripping element to a second position to release the object, and wherein the holding device is non-backdrivable;
a stall detection module configured to (i) monitor a sensor signal received from a sensor of an electric motor assembly of the holding device (ii) detect a first stall condition of an electric motor based on the sensor signal and (iii) detect a second stall condition of the electric motor based on the sensor signal; and
a shut off module configured to shut off current to the electric motor based on the detection of the first stall condition during or at an end of the release stroke and to shut off current to the electric motor based on the detection of the second stall condition during or at an end of the hold stroke.
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Accused Products
Abstract
A holding system includes a force control module configured to generate a force signal to cause a holding device to perform at least one of a hold stroke and a release stroke. The hold stroke includes transitioning a gripping element of the holding device to a first position to grip an object. The release stroke includes transitioning the gripping element to a second position to release the object. The holding device is non-backdrivable. A stall detection module is configured to (i) monitor a sensor signal received from a sensor of an electric motor assembly of the holding device and (ii) detect a first stall condition of an electric motor based on the sensor signal. A shut off module is configured to shut off current to the electric motor based on the detection of the first stall condition during or at an end of the release stroke.
84 Citations
21 Claims
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1. A holding system comprising:
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a force control module configured to generate a force signal to cause a holding device to perform at least one of a hold stroke and a release stroke, wherein the hold stroke includes transitioning a gripping element of the holding device to a first position to grip an object, wherein the release stroke includes transitioning the gripping element to a second position to release the object, and wherein the holding device is non-backdrivable; a stall detection module configured to (i) monitor a sensor signal received from a sensor of an electric motor assembly of the holding device (ii) detect a first stall condition of an electric motor based on the sensor signal and (iii) detect a second stall condition of the electric motor based on the sensor signal; and a shut off module configured to shut off current to the electric motor based on the detection of the first stall condition during or at an end of the release stroke and to shut off current to the electric motor based on the detection of the second stall condition during or at an end of the hold stroke. - View Dependent Claims (2, 3, 4)
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5. A holding system comprising:
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a force control module configured to generate a force signal to cause a holding device to perform at least one of a hold stroke and a release stroke; a stall detection module configured to (i) monitor a sensor signal received from a sensor of an electric motor assembly and (ii) detect a stall condition of an electric motor based on the sensor signal including detecting when a leadscrew of the holding device is in a binded state and against a hard stop; and a boosting module configured to increase current to the electric motor to a boost current level, unbind the leadscrew of the electric motor assembly, and overcome the binded state of the leadscrew, wherein the boost current level is greater than an applied current level, wherein the applied current level is used to transition a gripping element of the holding device between a hold state and a release state, and wherein the boosting module, when boosting the current, is configured to adjust the force signal based on a direction of travel of the electric motor and the sensor signal. - View Dependent Claims (6, 7, 8, 9)
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10. A holding system comprising:
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a force control module configured to generate a force signal to cause a holding device to perform a release stroke, wherein a gripping element of the holding device is actuated to release an object when the release stroke is performed; a stall detection module configured to (i) monitor a sensor signal received from a sensor of an electric motor assembly and (ii) detect a stall condition of an electric motor based on the sensor signal; an end-of-travel module configured to move the gripping element of the holding device away from a hard stop a predetermined distance including adjusting the force signal and moving the gripping element from a first position to a second position based on the detection of the stall condition; and a motor control module configured to shut off power to the electric motor when the gripping element is in the second position. - View Dependent Claims (11, 12, 13, 14)
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15. A holding system comprising:
- a force control module configured to generate a first force signal to cause a holding device to perform at least one of a hold stroke and a release stroke including;
operating in an applied torque mode and a hold mode; providing a first current level during the applied torque mode to open or close gripping elements of the holding device; and providing a second current level during the hold mode to hold an object; and a stall detection module configured to (i) monitor a sensor signal received from a sensor of an electric motor assembly and (ii) detect a stall condition of an electric motor based on the sensor signal at an end of the hold stroke or the release stroke, wherein the force control module is configured to adjust the force signal to reduce current to the electric motor from the first current level to the second current level based on detection of the stall condition and while the holding device is holding an object, wherein the second current level is greater than a minimum current level for holding the object. - View Dependent Claims (16, 17, 18, 19, 20, 21)
- a force control module configured to generate a first force signal to cause a holding device to perform at least one of a hold stroke and a release stroke including;
Specification