摘要:
A fan speed control system (200) for an electronic equipment enclosure comprises means for determining temperature (201, 202, 203, 210, 211) at a plurality of locations within the enclosure, means for determining operating parameters (201, 202, 203, 212) for the fan control system, means for setting operating speed (201) of at least one cooling fan, and means for exchanging information signals (205, 217, 218) relating to fan speed control system operation with an external controller. A method is also provided for controlling fan speed for an electronic equipment enclosure comprising the steps of determining temperature at a plurality of locations within the enclosure, determining operating parameters for the fan control system, setting operating speed of at least one cooling fan, and exchanging information signals relating to fan speed control system operation with an external controller.
摘要:
A motor monitoring system including a control chip and a motor is disclosed. The control chip could be a chipset or a monitoring chip able to control the rotational speed of the motor. The control chip is used to receive a temperature reading and output a control signal according to the temperature reading. The motor receives the control signal and automatically adjusts the speed of its own accordingly. Hence, the configuration of the monitoring system is simplified, the R&D flow is shortened, and the cost of R&D and manufacturing are greatly reduced.
摘要:
The apparatus and method includes a panel movable between at least two positions. An electric motor has a rotating armature. A multiple pole magnet is mounted on the armature. A sensor detects the passage of each magnet pole and generates an output signal. A control measures time periods between each pole passage. An average time period is computed over a predetermined number of time periods. The difference between average time periods is computed and compared with a threshold difference to determine if an obstacle is present in the path of movement of the panel. Transient counts are accumulated for increasing average time periods over a number of time period samples as a measurement of the force exerted on an obstacle by the panel to detect an obstacle.
摘要:
A movable barrier operator having a microprocessor (10) or other programmable platform will automatically work in a safe and appropriate manner both with and without safe-operation sensors (13). Once a safe-operation sensor is detected, the operator will thereafter function in a fashion that requires the continued presence of such sensor. In one embodiment, the operator state can be purposely reset to the initial operating state.
摘要:
Pulse variable information is used to control at least obstacle detection and also, optionally, speed of movement of a movable barrier. In one embodiment, pursuant to a learning mode the movable barrier is moved and, while moving the movable barrier, at least one pulse variable that corresponds to movement of the movable barrier at a desired speed is measured and used to determine at least one predetermined threshold that corresponds to a level of excessive force as exerted by the movable barrier. This threshold can then be used during an operating mode to facilitate detection of barrier obstacles.
摘要:
An asymmetrical drive motor and apparatus with the asymmetric drive motor driving a barrier. The asymmetric drive motor drives the barrier at different drive powers according to direction, time of travel, safety requirements or speed. The drive power is controlled by electrically changing the capacitance value for a permanent split capacitor motor.
摘要:
A protective device includes a signal input intended for connection to a sensor, a signal output intended for connection to an evaluation unit, and an isolation element for galvanically separating the signal input from the signal output. The provision of the protective device prevents a transmission of overvoltages from the sensor to the evaluating unit.
摘要:
A power control device for positioning at a low voltage side of a load for controlling the electrical power available to the load, from a main power supply, the power control device including a current switch for switching current on and off under the control of a pulse width modulating device thus to control the power available to the load, the pulse width modulating device being operated by power derived from the main power supply.
摘要:
A combined gate drive and current sensing circuit for a 3-phase AC PWM inverter system which uses gate signal information to reconstruct complete motor phase current for providing a linear motor phase current feedback signal.
摘要:
A method for adjusting an input parameter of an adjustable bolster (12) on a seat (10) of a vehicle (22). The preferred method includes (a) establishing a relationship between the input parameter and a feedback force on the adjustable bolster (12) and (b) adjusting the input parameter based on the relationship.