Control apparatus for A-C elevator

Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support

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318759, 187112, B66B 132

Patent

active

046677763

ABSTRACT:
In a case where a braking torque is required as in the slowdown mode of the cage of an elevator, regenerative power within a range within which the generation of heat by a motor is permissible is consumed in the motor, and excess regenerative power is consumed by a regeneration resistor, so that a control apparatus can be made smaller in size.
A braking torque is controlled in such a way that when a braking torque command is not greater than a predetermined value, only the magnitude of current is controlled with a slip fixed, and that when the braking torque command has exceeded the predetermined value, the slip is decreased without increasing the magnitude of the current.
Regenerative power is partly fed back to a D-C side. Since, however, the current is suppressed within a predetermined value, so that the current capacity of an inverter can be restrained and that the resistor for consuming the regenerative power on the D-C side does not increase considerably. Moreover, since the power to be consumed in the motor decreases, the heat generation of the motor can be suppressed. Thus, a system with a thermal balance considered as a whole can be constructed.

REFERENCES:
patent: 4475631 (1984-10-01), Nomura
patent: 4483419 (1984-11-01), Salihi et al.

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