Abstract:
The invention relates to an adjustment device (1) for controlling the electric drive (2) of an elevator in connection with a voltage reduction of the supplying network. The electric drive of an elevator comprises an electric motor (3) and a power supply apparatus (4) of the electric motor for adjusting the supply voltage of the electric motor. The adjustment device comprises means (5, 6, 7) for controlling the power supply apparatus (4) of the electric motor and also a speed regulator (8) for adjusting the speed of the electric motor. The adjustment device (1) is arranged to determine the output voltage (9) of the power supply apparatus of the electric motor in relation to the permitted maximum value of the output voltage, and the adjustment device (1) is arranged to interrupt the operation of the speed regulator (8) but to continue the operation of the power supply apparatus (4) of the electric motor when the output voltage (9) of the power supply apparatus of the electric motor reaches the permitted maximum value.
Abstract:
The invention is related to a method of initiating a regenerative converter (1) for supplying electrical power to an electric motor (10) of a hoisting machine to drive an elevator car of an elevator system. The invention is also related to an elevator system comprising an elevator car, and a hoisting machine comprising an electric motor (10), the hoisting machine arranged to drive the elevator car of the elevator system, and said regenerative converter (1). The method comprises charging, through the line bridge (2) and while the machine bridge (3) remains inactive, the DC intermediate circuit (8A, 8B) to a target voltage (14) higher than peak value of the mains voltage (13).
Abstract:
A method for determining a rotor position of an electric motor (12), an elevator (100) and an electrical converter unit (14) are presented. The method comprises supplying (41) a first excitation signal (ES1) to the electric motor (12), determining (42) a first response signal (RS1) generated in the motor (12) in response to the first excitation signal (ES1), determining (43), based on the first response signal (RS1), an electrical angle of a direct axis (D, -D, +D) of the motor (12) with respect to a stationary reference frame, supplying (44) a second excitation signal (ES2) to the motor (12), wherein the second excitation signal (ES2) is based on the determined electrical angle, determining (45) a second response signal (RS2) generated in the motor (12) in response to the second excitation signal (ES2), and determining (46) the rotor position based on the second response signal (RS2).
Abstract:
A method for performing an emergency stop with an elevator and a safety arrangement of an elevator are disclosed. In the method, when an emergency stop criterion is fulfilled, the elevator car is driven with the electric motor of the hoisting machine to a stop with a given deceleration profile.
Abstract:
The invention relates to a method and to devices for starting up an electric drive of an elevator. In the method a sensor that detects the direction of movement of the elevator car is fitted into the elevator system, the elevator car is brought into a state of movement, the direction of movement of the elevator car is detected from the measuring signal of the aforementioned sensor that detects the direction of movement of the elevator car and also the drive direction of the electric drive is connected in the control of the electric drive to the detected direction of movement of the elevator car.
Abstract:
An elevator (1) comprises a control system (114) for monitoring the load of a car (102), which control system (114) is adapted to prevent the normal starting of the elevator (1), optionally also including relevelling, when there is an overload in the car (102). In the invention, the elevator (1) comprises at least one position measuring device, speed measuring device and/or movement measuring device (115) in order to determine the movement and/or position of the car (102), and the control system (114) of the elevator (1) is adapted to remove the prevention of normal starting when at least one said position measuring device, speed measuring device and/or movement measuring device (115) detects that the car (102) moved or is moving upwards in the elevator shaft (100). In the method, the control system (114) of the elevator (1) is used to determine the load situation of the car (102), including both the steps to prevent the normal starting of the elevator (1), optionally also including relevelling, when there is an overload in the car (102) and to open some of the machinery brakes (160, 162) and to keep the remaining machinery brakes (160, 162) closed in order to determine the load situation.
Abstract:
The invention concerns an electricity supply device (1, 2, 3) for supplying electric power in an elevator system. The electricity supply device (1, 2, 3) comprises a controllable power output stage (4, 5) which in turn comprises a connection to a load of the elevator system to be supplied, and a control circuit (18, 27) for controlling the drive device (6, 7) of the elevator. The invention is characterized in that the power output stage (4, 5) comprises one or more controllable solid-state switches (9) in the form of silicon carbide (SiC) solid-state switches, wherein a thermal barrier (19) is made between the aforementioned one or more silicon carbide solid-state switches (9) of the power output stage (4, 5) and the control circuit (18, 27) for reducing the thermal flow occurring from the silicon carbide solid-state switch/silicon carbide solid-state switches (9) to the control circuit (18, 27).