Is it possible to control the power of a hoist motor based on the specific load that will be lifted? What if the load is known by using a weight sensor?

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    \$\begingroup\$ Control the power to do what? \$\endgroup\$ – John D Jul 31 '17 at 17:12
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    \$\begingroup\$ Not without a much clearer idea what you are trying to achieve. \$\endgroup\$ – Brian Drummond Jul 31 '17 at 17:17
  • \$\begingroup\$ I think he wants to actively hold a weight without a brake, and use that as a dynamic "neutral point" of some other controller. If so, then yes, it's possible, but the primary risk from a controls perspective is going to be positive feedback causing the system to oscillate. \$\endgroup\$ – AaronD Jul 31 '17 at 17:45
  • \$\begingroup\$ If you intend to hold a weight without a break it is possible but most probably prohibited. You can not control the situation in case of a power failure \$\endgroup\$ – Decapod Jul 31 '17 at 18:18
  • \$\begingroup\$ Dr, & brothers , my idea is to let the motor of hoist to generate specific toque or power to raise known load which will be measured by the weight sensor \$\endgroup\$ – Nasif Jul 31 '17 at 19:03

Electronic controls can control all of the various aspects of motor performance, but the natural relationship among the various aspects limits the ability to control them. The control system must also be limited by the physical capabilities of the motor. In addition, the characteristics of the load impose limits on the performance of the motor. In choosing to control torque, you must remember that you can no longer control speed except to set maximum and minimum speed limits. When these limits are reached, torque control is no longer in effect. You can also have a torque control loop inside a speed control loop. The choice of control strategy is made with consideration of the nature of the driven machine.

You need to think about speed, torque, power and acceleration rate. Determine how these are related to the characteristics of the motor and load. Define what overall performance benefit will be gained by controlling torque. Determine if torque should be the primary adjustment that should be set by the operator.

The electronic control can be configured to do anything you want it to do. What needs to be done is to determine how the driven equipment can best be used by the operator. Then determine how to implement a control system to make that happen.

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