A system and method of a variable speed cooling fan (30) for a skid mounted compressor (22). A magnetic variable speed clutch (38) is mounted to the cooling fan drive shaft (28). The clutch mechanism is driven via by a drive pulley (38) on the crankshaft of the engine (24) driving the compressor (22). The speed of the fan (30) is varied dependent upon the temperature of the fluids being cooled.

A system and method of a variable speed cooling fan (30) for a skid mounted compressor (22). A magnetic variable speed clutch (38) is mounted to the cooling fan drive shaft (28). The clutch mechanism is driven via by a drive pulley (38) on the crankshaft of the engine (24) driving the compressor (22). The speed of the fan (30) is varied dependent upon the temperature of the fluids being cooled.

A current whose magnitude corresponds to first pressing force-current characteristics set to prevent forward movement of a driven member from being stopped is applied to a motor when the driven member moves forward, and a current whose magnitude corresponds to second pressing force-current characteristics set to move the stopped driven member forward is applied to the motor when the driven member is stopped, in the case where a relationship between a pressing force as a force with which a friction member presses a rotating body and an energization current to the motor is defined as pressing force-current characteristics.

A current whose magnitude corresponds to first pressing force-current characteristics set to prevent forward movement of a driven member from being stopped is applied to a motor when the driven member moves forward, and a current whose magnitude corresponds to second pressing force-current characteristics set to move the stopped driven member forward is applied to the motor when the driven member is stopped, in the case where a relationship between a pressing force as a force with which a friction member presses a rotating body and an energization current to the motor is defined as pressing force-current characteristics.

While a vehicle is coasting with an engine being automatically stopped and a power transmission path between the engine and wheels being disengaged, when a deceleration request is made and the engine is restarted with the power transmission path being engaged, a deceleration level increases relative to the deceleration level required by a driver or the vehicle, thereby lowering drivability. A vehicle control apparatus includes a deceleration level control unit that controls the deceleration level of the vehicle such that, during travelling of the vehicle continuing to travel with a power transmission mechanism between the engine and the wheels being disengaged, when the deceleration request is made and the engine is started by an engagement of the power transmission mechanism, the deceleration level becomes a target deceleration level calculated from a first target deceleration level generated after the engagement of the power transmission mechanism is complete and a second target deceleration level generated in response to the deceleration request.

A magnetic control device for directly sensing the motion load value especially the one that has a magnetic resistance mechanism which is floating and pivoted on the inner edge of the outer ring body of a flywheel; an acting rod, one end of is locked on the outside of the magnetic resistance mechanism and synchronized with it, and the other end has a pressure applied member connected to the beam load cell; a torque value conversion unit for converting the load value of the beam load cell into a torque value; so as to achieve directly measuring the motion load value, which has the effect of improving the detection accuracy.

A magnetic control device for directly sensing the motion load value especially the one that has a magnetic resistance mechanism which is floating and pivoted on the inner edge of the outer ring body of a flywheel; an acting rod, one end of is locked on the outside of the magnetic resistance mechanism and synchronized with it, and the other end has a pressure applied member connected to the beam load cell; a torque value conversion unit for converting the load value of the beam load cell into a torque value; so as to achieve directly measuring the motion load value, which has the effect of improving the detection accuracy.

A robot control device has a drive shaft driven by a servo motor including a non-excited operation type electromagnetic brake, wherein, in a brake release state of the non-excited operation type electromagnetic brake, energization ON and energization OFF of an exciting coil of the non-excited operation type electromagnetic brake are alternately repeated, and at that time at least the timing of the energization ON is deviated between a plurality of exciting coils. It is possible to realize heat generation suppression/energy saving while suppressing generation of noise in the non-excited operation type electromagnetic brake of the robot.

A robot control device has a drive shaft driven by a servo motor including a non-excited operation type electromagnetic brake, wherein, in a brake release state of the non-excited operation type electromagnetic brake, energization ON and energization OFF of an exciting coil of the non-excited operation type electromagnetic brake are alternately repeated, and at that time at least the timing of the energization ON is deviated between a plurality of exciting coils. It is possible to realize heat generation suppression/energy saving while suppressing generation of noise in the non-excited operation type electromagnetic brake of the robot.

A method of operating a power tool having a motor and a controller is provided. The method includes: setting a protection time limit associated with a condition of the motor; taking protective action to shut down the motor if the condition of the motor persists for a duration of the protection time limit; and in response to occurrence of the condition during a start-up period of operation of the motor, extending the protection time limit for a duration of a constant-clutch time period to allow an output speed of the motor to reach or exceed a speed threshold, and taking protective action to shut down the motor if the output speed of the motor remains below the speed threshold for the duration of the constant-clutch time period.