86results about How to "Reduce motor speed" patented technology

A processor for controlling a sensorless, brushless DC motor is disclosed comprising a first output for providing a control signal to a potentiometer controlling the speed and voltage of the DC motor. The processor also includes a second input for receiving a back-EMF voltage from an open phase of a three phase winding. The processor determines a digital error signal from the back-EMF voltage and generates a control signal responsive to the digital error signal. The control signal decreases the speed of the motor when the digital error signal is in a first range. The processor decreases both the speed and voltage of the motor when the digital error signal is in a second range. The processor increases the speed of the motor when the digital error signal is in a third range. The processor increases both the speed and voltage of the motor when the digital error signal is in a fourth range.

A stabilizer system for a vehicle, including: (a) a stabilizer bar (28) including (a-1) a torsion bar portion (90), and (a-2) an arm portion (92) that extends from the torsion bar portion toward a wheel (12) of the vehicle; and (b) an actuator (32) including (b-1) a motor (40), and (b-2) a speed reducer (42) that reduces a speed of the motor while transmitting a force of the motor to the torsion bar portion of the stabilizer bar. The stabilizer bar generates a stabilizing force which is dependent on a reaction generated as a result of torsion of the torsion bar portion, and which forces the wheel and the vehicle body in a direction toward each other or a direction away from each other The actuator allows the stabilizer bar to generate the stabilizing force whose magnitude is dependent on a magnitude of the motor force and is changeable depending on an amount of rotation of the torsion bar portion. The actuator includes an actuator-efficiency changing mechanism changing a negative efficiency of the actuator, depending on a direction of the force of the motor.

A heater effectively uses a current controlled fan motor in series with a resistance heating arrangement. The fan motor preferably is wound with a gauge of wire to appropriate for the relatively high current provided to the fan motor. This arrangement is effectively used to adjust the fan speed to match the heat output when the heating arrangement has variable heat output. More desirable operating characteristics are achieved without increasing costs and fan motor manufacturing savings are realized. The portable heater preferably produces heat at different outputs and the current used to power the resistance heating arrangement is used to power the fan motor.

A control device of a hybrid vehicle, configured with an engine; a motor that rotates together with the engine at least during traveling by using a driving force of the engine, and a speed change mechanism that shifts rotation of the engine and the motor to transmit the shifted rotation to a driving wheel. A zero torque control unit controls output torque of the motor to zero torque when a rotational speed of the motor reaches a predetermined rotation speed or more by driving rotation of the engine, and a motor temperature detection unit that detects a temperature of the motor. A motor protection control units that reduces a rotational speed of the engine when the temperature of the motor reaches an upper threshold value or more while the motor is being rotated at the predetermined rotational speed or more by the driving rotation of the engine.

The present invention provides a motor control device capable of operating a robot properly without stopping a motor that operates the robot even when an instantaneous voltage drop occurs. The motor control device 10 that controls the robot operating motor 102 is equipped with the subtraction unit 109 that calculates the position deviation for which the actual rotational position is subtracted from the position command, the position control unit 110 that converts the position deviation to the speed command, the subtraction unit 111 that calculates the speed deviation for which the actual rotational speed measurement is subtracted from the speed command, the speed control unit 112 that converts the speed deviation to a torque command, the limiter 113 that sets the maximum level of the torque command, the driver 114 that drives the motor 102, and the voltage fluctuation detection unit 115 that detects the voltage fluctuation of the power source 103; in the motor control device 101, when an instantaneous voltage drop is detected by the voltage fluctuation detection unit 115, the position command output unit 108 varies the position command so as to reduce the rotational speed of the motor 102, and the position control unit 110 limits the speed command to be output.

In a geared motor, a worm wheel, an O-ring, a transmission plate and an output gear are installed to a support shaft. The O-ring is placed in an inner space of a receiving through hole of the transmission plate, through which the support shaft is received. Grease is applied to an outer peripheral surface of the support shaft. A grease relief passage, which relieves the grease, extends between the output gear and the transmission plate.

A fluid dispense system having a computer control system that operatively controls a stepper motor driving a pump. The stepper motor actuates the pump piston through partial revolutions. The computer control system determines the number of stepper motor steps required to pump a desired amount of fluid by the pump by rotating the piston through segments which are less than a full revolution. Further, the controller varies the speed of the stepper motor to avoid splashing of the dispense fluid and motor stalling.

In a DC motor drive unit having an open loop control system, a judgment is made as to whether an externally supplied speed instruction data instructs driving of the DC motor or not, based on the speed instruction data itself. If a judgment is made that the speed instruction data instructs driving of the DC motor, a switching means (e.g. switching transistor) connected to the DC motor is controlled by PWM pulses having prescribed duty ratios over a predetermined acceleration period to accelerate the DC motor. After the acceleration period, the switching means is controlled by the PWM pulses having a duty ratio as instructed by the speed instruction data to drive the DC motor. This scheme permits suppression of the startup current of the motor, and hence reduction of the withstand current of the switching transistor, while ensuring secure startup of the motor. In addition, the range of controllable speed of the DC motor can be broadened.

A low energy stepper motor driven fuel metering valve (FMV) that eliminates the need for a position sensor is provided. The stepper motor rotates a cam that replaces the flapper valve used in conventional systems. The cam rotation increases the gap between the cam and nozzle on one side of the cam and decreases the gap between the cam and nozzle on the other side. The gap differences affect the pressures on the spool piston ends, which forces the piston in the direction that will re-equalize the cam-nozzle gaps. As a result, the relatively low energy stepper motor controls the relatively high energy hydromechanical system via the dual cam-nozzle-orifice system. The cam is precision machined and assures stroke/degree gain accuracy. The hydraulic system assures the piston tracks the cam essentially perfectly except for the effects of piston stiction forces.

A method is provided of controlling a pump including a electrical motor coupled to a rotor which carries first and second impellers at opposite ends thereof. The method includes: (a) driving the rotor using the motor, so as to circulate fluid from the first impeller through a first fluid circuit, the second impeller, a second fluid circuit, and back to the first impeller; (b) determining a resistance of the first fluid circuit, based on a first motor parameter; (c) determining a flow rate through the first fluid circuit based on a second motor parameter; and (d) varying at least one operational parameter of the pump so as to maintain a predetermined relationship between the flow rate and the resistance of the first fluid circuit.

A power driven tool useful for tightening and loosening a mechanical fastener includes an impact mechanism. Preferably, the tool is pneumatic and includes a ratchet head and an impact device for providing additional torque to the ratchet head. A planetary reduction gear reduces the high output speed of a pneumatic motor for input into the impact device and reduces wear on the impact device.

An electromotive adjustment device for adjusting a control element includes a housing and a gear mechanism which has a plurality of intermeshing gear wheels to define a drive train. In driving relationship with the gear mechanism is a drive motor which is constructed as a brushless motor with an external rotor and includes an output journal, whereby the output journal has a tooth portion in engagement with a helical spur gear wheel of the gear mechanism.

A printer that performs printing on a print target includes a motor, a storage device, a measurement control device, a corrected output power calculating device, and a corrected output power applying device. The motor applies a driving force for transporting a transport object. The storage device stores reference information relating to reference stop characteristics of the motor. The measurement control device controls driving of the motor for measuring actual stop characteristics of the motor. The corrected output power calculating device outputs a corrected output power by comparing the actual stop characteristics with the reference stop characteristics when the measurement control device controls driving of the motor. The corrected output power applying device outputs the corrected output power to the motor so that a stop condition of stopping the transport object is satisfied.

The present invention relates to an ice transfer device for a refrigerator, which can transfer ice made in an ice maker to a dispenser in the refrigerator, and a control circuit of the ice transfer device. The ice transfer device for a refrigerator according to the present invention comprises a storage container installed within the refrigerator to contain ice therein; a motor installed close to the storage container and having a motor shaft protruding in a direction opposite to a direction of transfer of the ice; a gearbox that is installed at a side opposite to a part for delivering the ice contained in the storage container to the outside, is connected to the motor shaft, and has a driving shaft protruding in the transfer direction of the ice to transmit a driving force while reducing a driving speed of the motor; and a transfer member installed within the storage container and connected to the driving shaft to push the ice forward by means of the driving of the motor. According to the present invention constructed as above, the formation of an unnecessary space in the interior of the refrigerator can be minimized, thereby improving the efficiency of use of a space.