Elevator control device

An elevator control device for use with an elevator including a car and a counter weight, the car and the counter weight being supported by a main rope wound around a sheave of a motor, the elevator control device comprising:

• a car speed instruction value generator configured to generate a car speed instruction value with respect to the car;
• a motor speed controller configured to control a motor drive circuit configured to control rotation of the motor, based on a motor speed instruction value;
• and
• a car vibration control calculator configured to output to the motor speed controller the motor speed instruction value comprising, relative to the car speed instruction value, a reduced component of a vibration frequency of vibration generated in the car,
• the car vibration control calculator being configured to output the motor speed instruction value comprising the reduced component of the vibration frequency configured to change based on position information of the car inside a hoistway of the elevator,
• the car vibration control calculator comprising:
• a car vibration control component calculator configured to calculate a vibration control component of the car based on the car speed instruction value;
• and
• an adder configured to add the car speed instruction value and the vibration control component of the car,
• the car vibration control component calculator comprising:
• a second-order differentiation calculator configured to calculate a second-order differentiation component of the car speed instruction value;
• a vibration control gain calculator configured to calculate a vibration control gain from position information of the car, the vibration control gain being a component obtained by multiplying an inverse component of a square of a vibration angular frequency present in the main rope between the car and the sheave;
• and
• a multiplier configured to calculate the vibration control component of the car by multiplying the second-order differentiation component of the car speed instruction value and the vibration control gain,
• the vibration control gain calculator being configured to hold information of an inverse component of a square of a vibration angular frequency at at least one position of the car inside the hoistway of the elevator and calculate a vibration control gain by performing linear interpolation of the inverse component of the square of the vibration angular frequency according to the position information of the car inside the hoistway of the elevator.

An elevator control device for use with an elevator including a car and a counter weight, the car and the counter weight being supported by a main rope wound around a sheave of a motor, the elevator control device comprising:

• a car speed instruction value generator configured to generate a car speed instruction value with respect to the car;
• a motor speed controller configured to control a motor drive circuit configured to control rotation of the motor, based on a motor speed instruction value;
• a car vibration control calculator configured to output to the motor speed controller the motor speed instruction value comprising, relative to a component of a vibration frequency of vertical vibration of the car included in the car speed instruction value, a reduced component of the vibration frequency of the vertical vibration of the car;
• and
• a change-over switch configured to switch whether or not to reflect in the motor speed instruction value a car vibration control component generated by the car vibration control calculator, according to an operation mode of the elevator,
• wherein the car vibration control calculator comprises:
• a car vibration control component calculator configured to calculate a vibration control component of the car based on the car speed instruction value;
• and
• an adder configured to add the car speed instruction value and the vibration control component of the car.