Abstract: A motor control device according to an aspect of the present disclosure controls a motor by switching between speed control and position control, and sets a maximum voltage applied to the motor during the position control to lower than a maximum voltage applied to the motor during the speed control.

Abstract: The present invention relates to a crane (101). The crane (101) has a hoist (113) for performing a lifting operation and a controller (125) for controlling operation of the crane. At least one sensor (127) is provided for detecting the presence of a person in a safety region (129). The controller (125) is configured to inhibit operation of the crane (127) when the sensor (127) detects a person in the safety region (129). The present invention also relates to a crane control system and a method of operating a crane (101).

Abstract: An apparatus is provided for detecting a malfunction occurring in an electromagnetic brake of a robot. In the apparatus, the main relay and the sub-relay are controlled to open the main contact and the sub-contact when the robot is activated. Detecting is then made whether or not the main contact is malfunctioning, by monitoring an energized state of the main contact. Activation of the robot is stopped when the main contact is malfunctioning and the main relay is controlled to close the main contact for a given period of time when that the main contact is operating normally. Detecting is further made as to whether or not the sub-contact is malfunctioning, by monitoring an energized state of the sub-contact The activation of the robot is stopped when the sub-contact is malfunctioning and the main relay is controlled to close the main contact when the sub-contact is operating normally.

Abstract: Device for driving a body by means of an electric motor, comprising mechanical means for measuring the displacement of said body which are kinematically linked to the body and are equipped with switches (ID, IM) actuated by the mechanical measurement means at certain points on the trajectory of the body. The device comprises means for initializing a phase for specific powering of the motor such as power supply at reduced torque for a timed duration (TP, x, C4) or power supply at reduced voltage or cut-off of the power supply, switched in by actuation of at least one of said switches.

Abstract: A control for an automatic washing machine with a reversing permanent split capacitor (PSC) drive motor. Separate ferrite core sensors surround each of two PSC motor windings. A sense winding is threaded through both sensors. A brief output voltage is generated whenever the alternating current in either PSC motor winding passes through a zero-crossing and when the sense winding is wound with proper mutual polarity, an output voltage is generated in response to zero-crossings of a brief, residual alternating current which flows in both PSC motor windings and the capacitor when the rotating PSC motor is cycled OFF.

Abstract: A multiple speed control means for a variable speed motor system used for driving a hoist including multiple fixed speeds and a low speed range which is incrementally variable throughout the range. The control means provides distinct voltage levels which correspond to fixed motor speeds, the highest voltage corresponding to the maximum or full speed of the motor. Manual switch means switch into these fixed speeds or into the variable low speed range when the system is either in the hoist or lowering mode for respectively lifting or lowering a load in place.A quick response circuit is connected into the system for a predetermined time duration after the system is switched into any of the speed positions except the maximum speed position.

Abstract: This invention concerns a control for starting an electric motor such as a three phase, a.c. drive motor in an elevator system. The motor is connected to a power source through reversible contactors and back-to-back SCRs. A speed control generates a desired speed signal to SCR trigger circuits to control the flow of current in the motor and thereby maintain the desired speed. The speed control includes means responsive to a step start signal for generating the desired speed signal with predetermined values of jerk and acceleration. If the motor overspeeds, such as in a lowering load condition, the control turns off the SCRs at a first predetermined value of overspeed and reverses the contactors and turns on the SCRs at a second predetermined value of overspeed to brake the motor.

Abstract: A variable speed motor control system for controlling the vertical speed of a hoist. An electro-mechanical brake means locks the hoist load in place when the system is off or when the motor speed is set at a zero speed setting. A quick response circuit is connected into the system for a predetermined time duration after the system is switched from a zero speed to any speed setting (high or low speed), to enable the motor to quickly gain control over the load and prevent the load from slipping as the motor accelerates to the set speed after the brake is released. An initial delay timer is turned on when electrical power is first connected into the system, to prevent transfer of electrical power to the motor and to prevent release of the brake, for a predetermined period of time. A hoist (up-down) electro-mechanical contactor connects electrical power from a source to a thyristor static switch.