Embodiments herein relate to a drive system for an electric motor. The drive system including a DC bus having a positive terminal and a ground terminal, an inverter connected to the DC bus configured to provide a plurality of motor excitation signals, and an interface cable operably connected to the inverter, and configured to transmit the plurality of motor excitation signals. The drive system also includes a motor remote from and connected to the inverter via the interface cable, the motor responsive to the motor excitation signals and a plurality of snubber circuits, each of the snubber circuits having a first terminal connected to a winding of the motor, and a second terminal operably connected to a first end of a transmission line and a second end of the transmission line is connected to the positive terminal of the DC Bus.

The invention relates to an energy storage device and a method for operating an energy storage device comprising a plurality of energy storage modules. In order to adjust the output voltage to the energy storage device, one or more energy storage modules is/are connected in series. According to the invention, the series-connected energy storage modules are selected in accordance with the state of charge and at least one other operating parameter in order to be able to use the individual energy storage modules in a particularly efficient manner.

The invention provides a signal generating method for accurately controlling a motor, the method comprises the steps of generating a period compensation signal and a duration compensation signal, can generate a control signal which is more in conformity with the actual vibration condition of the motor, so that the motor can be controlled more accurately.

A direct current electrical machine, which includes a rotor that generates a rotor magnetic field, a first commutation cell that includes a winding component, a first switching device, and a second switching device. The first winding component includes a first portion electrically coupled between a first terminal and a second terminal of the first winding component and a second portion electrically coupled between a third terminal and the second terminal of the first winding component. The first switching device is electrically coupled to the first terminal and is closed when a first voltage induced across the first portion by rotation of the rotor magnetic field is positive; and the second switching device is electrically coupled to the third terminal and is closed when a second voltage induced across the second portion by the rotation of the rotor magnetic field is negative.

The invention relates to a power supply unit for supplying multiple conductor portions (3) of a stator winding of an electric machine which are inserted in respective slots (2), wherein the power supply unit is configured to supply a first conductor portion and a second conductor portion with at least one different operating parameter of a respective current function and/or the power supply unit is configured to supply a conductor portion with at least two superimposed current functions, which in each case have at least one different operating parameter. Furthermore, the invention relates to an electric machine having such a power supply unit.

A method for controlling a permanent magnet synchronous electrical machine powered by a battery delivering a supply voltage to terminals of the battery, the method including: calculating an initial direct voltage component Vdc and an initial quadratic voltage component in a rotating reference; checking a saturation condition; calculating an angle α of a formula; generating voltages to be applied to the electrical machine if α varies negatively and Vdc is positive or if α varies positively and V dc is negative. The method for example can be applied in a control of synchronous electrical machines.

A robotic catheter control system includes a plurality of electric motors. Diagnostic logic automatically detects motor runaway fault conditions based on the current motor position, the target motor position and a predetermined tolerance parameter. Fault conditions include overshoot, movement in the a non-prescribed direction, exceeding a prescribed maximum motor speed and exceeding a prescribed maximum motor acceleration. The diagnostic logic terminates operating power to the electric motor when a fault condition is detected for any one of the motor. An error message is generated to notify the operator of the fault.

A motor control apparatus includes a counter, a margin calculation portion, and a cycle set portion. The counter counts a total number of switching the current supply phase of the coils when the rotor is rotationally driven. A rotation angle of the rotor is detected on a basis of the number of switching. The margin calculation portion calculates a torque margin that is a difference between an output torque of the motor and a load torque acting on the motor. The cycle set portion sets a current supply switching cycle to shorten as the torque margin is greater. The current supply switching cycle is a cycle switching the current supply phase of the coils.

A motor control system includes a drive motor and a deck motor that are connected to a battery, an ECU, and a key switch. The key switch acquires that an operation unit has been turned on, and transmits a restart permission signal to the ECU. When SOC of the battery reaches or falls below a first threshold set in advance, the ECU performs a step of disabling all the motors, and when the restart permission signal is received, the ECU performs a step of executing a decelerated travelling mode where the disabled state of the drive motor is released and an allowed speed of the drive motor is reduced.

The invention disclosed herein is an energy recovery system, for an electric motor, that uses the properties of dynamic braking to directly recharge a capacitive load made up of energy storage devices. The system contains switching circuitry that configures the energy storage devices into a capacitive load when braking is needed. Otherwise, the system configures the energy storage devices into a power supply for regular motor operation.