351results about "Multiple dc dynamo-electric motors control" patented technology

A method for estimating a service life of a motor that is driven by variable duty cycle control. The method includes calculating an elapsed service life ratio representing a ratio of an elapsed service life to all service life according to the following formula to estimate the service life of the motor:Ls=∑i⁢⁢(tiLi×(1.5)m)⁢⁢m=40-max⁡(40,Ki)10,where Ls represents the elapsed service life ratio, ti represents a driving time in a section i, Li represents a service life expectancy at a duty cycle Di in the section i and at an environmental temperature of the motor being 40° C., and Ki represents a temperature in the section i.

A novel multiple induction electric motor and vehicle that stores electrical power; provides a first and second direct current power input from the stored electrical power; separately produces first and second synchronized variable frequency alternating current control signal from the first and second direct current power inputs, respectively; produces first and second synchronized rotating magnetic fields responsive to the first and second variable frequency alternating current control signals, respectively; induces a first induced magnetic field around a conductor in a first inductive rotor responsive to the first rotating magnetic field; induces a second induced magnetic field around a conductor in a second inductive rotor responsive to the second rotating magnetic field; applies first and second rotational forces between the first and second rotating magnetic fields and the first and second induced magnetic fields to the shaft; and transmits the first and second rotational forces to a drive wheel.

A system and method for controlling multiple cooling fans is presented. The circuitry for directly driving each of the motors is removed from the motor casings, thus increasing air flow and reducing replacement costs should a motor fail. The system includes a common processor for centrally controlling the speeds of the motors and monitoring the performance of each of the multiple motors.

Each motor is controlled by a microcontroller and the set of microcontrollers is driven by a central controller. According to the invention, said method comprises: a preliminary step consisting at least in establishing an asynchronous serial communications link over a line between the central controller and each of the microcontrollers, and in allocating an address parameter to each microcontroller; and in operation, at least a control step proper consisting: i) for the central controller, in sending simultaneously on each link line a message containing at least one instruction specified by the address parameter of a destination microcontroller that is to execute said instruction; and ii) for each destination microcontroller, in extracting the instruction addressed thereto from said message, and executing it.

A system and method is provided for improved monitoring and controlling of mechanically commutated DC motors. The system and method include DC motors, pulse-count driver circuitry for driving the motors, motor position sensing circuitry, and motor control circuitry. The system and method provide for improved motor current waveform sensing that is able to effectively reject false brake pulses, avoid erroneous processing due to fluctuating battery voltage levels, and reduce the sensitivity to variations in motor current signals due to dynamic motor load, manufacturing variation, system aging, temperature, brush bounce, EMI, and other factors. The system and method also include an improved ability to multiplex additional external motor drivers to the motor control circuitry, select between sequential and simultaneous drive modes using an SPI bit, and monitor the system controller for an error condition and drive the connected motors in response to the error condition.

The invention provides a multiple-motor control circuit with a link arm bridge, comprising a half-bridge switch mode drive circuit. The control circuit is characterized in that the half-bridge circuit 100 and the half-bridge circuit 130 among a half-bridge circuit 100, a half-bridge circuit 130 and a half-bridge circuit 150 are combined to control the rotation direction and revolving speed of any direct current (DC) motor 110 so as to form the multiple-motor control circuit with a link arm-bridge; when the multiple motors are required to be controlled for operation, arm bridges can be added to realize the purpose; and every time one arm bridge is added, at least one motor can be controlled additionally. The control circuit provided by the invention drives a plurality of DC motors, thus realizing that a simple control device is utilized to control the plurality of DC motors. The control circuit provided by the invention is used for controlling the plurality of DC motors, thus greatly reducing the construction cost and volume of a control system and improving the reliability of the system. The control circuit is suitable for controlling multiple DC motors.