A hoist and a control method of the hoist
A control method and hoist technology, which can be applied to hoisting devices, cranes, spring mechanisms, etc., can solve problems such as correcting motor constants
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Embodiment 1
[0023] use Figure 1 ~ Figure 4 This embodiment will be described. figure 1 It is a perspective view showing the overall structure of the inverter-type lifting device provided with the hoist power monitoring device of this embodiment, figure 2 It is a block diagram showing the configuration of the control unit of the inverter-type lifting device.
[0024] The inverter-type lifting device consists of a crane hook 1, a steel cable 2, a lifting induction motor 3, a lifting device 4, a traverse induction motor 5, a traverse device 6, a traverse beam 7, a travel induction motor 8, and a travel Consists of a device 9 , a traveling girder 10 , a lifting / traversing inverter device 11 , an operation input device 13 , and a traveling inverter device 18 . In addition, an induction motor brake 16 and an encoder 17 are incorporated in the hoist induction motor 3 , and induction motor brakes 16 are incorporated in each of the traverse induction motor 5 and travel induction motor 8 .
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Embodiment 2
[0041] Next, use Figure 4 and Figure 5 It shows that the reason why the motor is difficult to rotate is not because of the low temperature of the motor, but because of the winch under some abnormal conditions. In addition, description of overlapping portions is omitted. use Figure 3 ~ Figure 5 A specific detection method for correction cancellation will be described.
[0042] The inverter control unit judges whether or not the motor is difficult to rotate due to an abnormality based on the integrated motor rotation speed and a predetermined abnormality upper limit. When the integrated rotational speed of the electric motor is equal to or less than the abnormal upper limit value, the inverter control unit determines that the rotational speed of the electric motor is above, cancels the motor constant correction, and outputs an abnormality of the electric motor.
[0043] Figure 5 This is a flowchart of motor rotation abnormality detection processing. In the processing o...
Embodiment 3
[0053] Next, in this example, using Figure 6 The following describes the case where, after turning on the motor constant correction, the temperature of the motor is sufficiently warm and the correction of the motor constant is unnecessary. Figure 6 It is a flowchart of the load time rate calculation process.
[0054] If the use time of the hoist has passed, the motor will heat up, and motor constant correction is not required. Therefore, the motor constant correction shutdown is executed based on the load hour rate calculated by the lift / travel inverter control unit 12 . This process is executed in the state where the hoist is operable.
[0055] Here, the operable state refers to a state in which the hoist can perform a lifting or lowering operation according to a lifting or lowering operation command from an input device (not shown). In addition, normally, the hoist can be operated by an operation command from the input device, but a state in which the operation command ...
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