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US 2003/0117094 A1Published application
Control for two or more dc motors, in particular actuators for adjustment of furniture
AssigneeLinak A/S
InventorJeppe Bastholm
Life of this patent
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AssigneeLinak A/S
InventorJeppe Bastholm
Estimating the term…
A control for DC motors, in particular actuators driven by a DC motor for adjustment of furniture, such as tables, beds, chairs, etc. inlcudes a pseudomotor which is capable of supplying a voltage that corresponds to the motor speed on the basis of the current and voltage supplied to the motor. The voltage of the pseudomotor is supplied to an adjustable power supply, where it is compared with an internal reference voltage and adjusts the voltage difference down to the smallest possible difference between the voltage of the pseudomotor and the internal reference voltage. For greater accuracy, the control additionally includes a compensation circuit configured to evaluate a dominating frequency in the commutator noise. Thus, there is provided a simple and low cost control for parallel running of two or more actuators.
A control for two or more DC motors, in particular actuators driven by a DC motor for adjustment of furniture, such as tables, beds, chairs, etc, the control is adapted to adjust the power supply to the individual motors such that the motors mutually keep the same or essentially the same speed independent of different loads on them, characterized in the control comprising a device for adjusting the power supply for each individual motor, a pseudomotor connected to each individual motor, said pseudomotor being constructed to supply a voltage which corresponds to a speed of the motor on the basis of the current and voltage supplied to the motor, wherein the voltages of the pseudomotor supplied to the power supply adjusting device are compared with a common reference voltage, and, when one motor experiences a greater load than the load of the other motors, the reference voltage is reduced such that the power supply to the other motors is reduced reducing the speed of the other motors corresponding to the reduction in speed of the one motor with the greater load.
Dependencies are inferred from the claim text.