| 摘要 |
PURPOSE:To rationally control without increasing the capacity of an operating device and a cost by selectively operating any of the speed or average speed corresponding to the maximum and minimum speed motors in response to the state of a load. CONSTITUTION:A comparator CPL selectively compares the motor (the minimum speed motor) at the latest acceleration rise at the accelerating time. A selection switch SW selects the output corresponding to the speed of the corresponding lowest speed motor, and delivers the selection command through an output circuit Cout to a variable voltage variable frequency controller (VVVF). A comparators CPH selectively compares the most late deceleration motor (the maximum speed motor) at the deceleration time. Any of the output of the CPL, the output of the CPH and the output corresponding to the average value speed output from an average circuit Av is delivered through the output circuit Cout to the VVVF in response to the characteristic of the load during the normal operation. |
