A compact electric motor (1) includes a housing (2), a stator (3), a rotor (4) with a rotor winding (5) or permanent magnets located thereon. A thermal protection device protects the electric motor against overheating. A sensor unit (6) is provided as a thermal protection device. The sensor unit (6) includes a temperature sensor (7) for detecting temperature-based measurement values, a radio module (8) with an antenna (8a) for sending sensor signals of temperature-based measurement values or data or information derived therefrom by radio to an external receiving unit (9). The sensor unit (6) has a memory (13) and a microcontroller (10). The sensor unit (6) is a self-supplying assembly.

The present invention refers to an electric terminal assembly of a drive unit for use in a mining machine. The electric terminal assembly comprises a junction box configured to be mounted to the drive unit and a connecting element for communicatively connecting the junction box to a control device of the drive unit. The electric terminal assembly is configured to be convertibly arranged into at least two different configurations, each of which is associated to a different structural arrangement of the drive unit.

The system described herein relates to commissioning variable frequency drives of electric drive systems, where at least one variable frequency drive has wireless data transmission equipment via which the variable frequency drive is supplied with data during commissioning. A commissioning device connects with the wireless data transmission equipment of the variable frequency drive during commissioning to transmit data to the variable frequency drive. The wireless data transmission equipment of the variable frequency drive is set up before commissioning so that the variable frequency drive can be communicated with under an individual identifier specific to the respective variable frequency drive and during commissioning identification of the individual variable frequency drive is carried out by the commissioning device using the identifier.

The system described herein relates to commissioning variable frequency drives of electric drive systems, where at least one variable frequency drive has wireless data transmission equipment via which the variable frequency drive is supplied with data during commissioning. A commissioning device connects with the wireless data transmission equipment of the variable frequency drive during commissioning to transmit data to the variable frequency drive. The wireless data transmission equipment of the variable frequency drive is set up before commissioning so that the variable frequency drive can be communicated with under an individual identifier specific to the respective variable frequency drive and during commissioning identification of the individual variable frequency drive is carried out by the commissioning device using the identifier.

A method of cooling a motor coupled to a compressor of a chiller includes adjusting a position of a motor cooling valve located fluidly between the motor and a refrigerant source, using a motor temperature control system coupled to the motor cooling valve to regulate an amount of refrigerant introduced into the motor from the condenser according to a temperature control scheme performed as a function of a monitored temperature in the motor, a first temperature threshold, and a second temperature threshold lower than the first temperature threshold. The temperature control scheme includes a motor cooling control process that adjusts the position of the motor cooling valve based on a stator winding temperature set point relating to stator windings of the motor. A proportionally limited close command override associated with a first temperature range above the second temperature threshold proportionally limits a close command provided to the motor cooling valve.

A method of cooling a motor coupled to a compressor of a chiller includes adjusting a position of a motor cooling valve located fluidly between the motor and a refrigerant source, using a motor temperature control system coupled to the motor cooling valve to regulate an amount of refrigerant introduced into the motor from the condenser according to a temperature control scheme performed as a function of a monitored temperature in the motor, a first temperature threshold, and a second temperature threshold lower than the first temperature threshold. The temperature control scheme includes a motor cooling control process that adjusts the position of the motor cooling valve based on a stator winding temperature set point relating to stator windings of the motor. A proportionally limited close command override associated with a first temperature range above the second temperature threshold proportionally limits a close command provided to the motor cooling valve.

A condition monitoring device for monitoring machinery includes a combination of on-board sensors and a condition monitoring module. The on-board sensors include modules for non-contact temperature, magnetic flux and 3-axis vibration sensing of the machinery. The condition monitoring module provides a condition monitoring signal containing information about an operating condition of the machinery, based upon a data synthesis condition monitoring technique that synthesizes non-contact temperature, magnetic flux and 3-axis vibration sensed data received from the combination of on-board sensors, determines a current operating condition of the machinery, and compares the current operating condition and the baseline operating condition of the machinery.

Generators, systems, and methods can comprise a resistance temperature detector (RTD) module; a controller area network (CAN) module; and an optical interface between the RTD module and the CAN module. The optical interface can be directly connected to each of the RTD module and the CAN module. The RTD module can be configured to convert first optical signals from the optical interface to first RTD signals and to convert second RTD signals to second optical signals for transmission through the optical interface to the CAN module. The CAN module can be configured to convert the second optical signals from the optical interface to first CAN signals and to convert second CAN signals to the first optical signals for transmission through the optical interface to the resistance temperature detector (RTD) module.

Generators, systems, and methods can comprise a resistance temperature detector (RTD) module; a controller area network (CAN) module; and an optical interface between the RTD module and the CAN module. The optical interface can be directly connected to each of the RTD module and the CAN module. The RTD module can be configured to convert first optical signals from the optical interface to first RTD signals and to convert second RTD signals to second optical signals for transmission through the optical interface to the CAN module. The CAN module can be configured to convert the second optical signals from the optical interface to first CAN signals and to convert second CAN signals to the first optical signals for transmission through the optical interface to the resistance temperature detector (RTD) module.

An apparatus for treating a respiratory disorder in a patient includes a power supply, a first power supply circuit coupled to the power supply, a pressure generator to generate a flow of air, a transducer to generate a flow signal representing a property of the flow of air, and motor power supply circuitry. The motor power supply circuitry includes: a motor controller to control operation of a motor in the pressure generator based on the flow signal; one or more storage elements to store energy generated by motor deceleration; an energy dissipation circuit to dissipate a portion the energy generated by the deceleration of the motor; and an energy transfer circuit to couple the one or more storage elements to the first power supply circuit and transfer the energy generated by motor deceleration and/or the energy stored by the one or more storage elements to the first power supply circuit.