An apparatus, method, and non-transitory computer readable recording medium to control a pump system may include a memory storing instructions and a processor that executes the instructions to obtain initial motor data of a motor controlled by a variable frequency drive (VFD) and determine a normal speed baseline of the motor based on the obtained initial motor data. The processor may also obtain current motor data of the motor, detect a pump-off event of the pump system when the current motor data deviates from the normal speed baseline, and control the VFD in response to the detected pump off event.

A vehicle control apparatus capable of protecting a pre-charge circuit is provided. When a voltage has entered an operating voltage range, a microcomputer determines whether a preset period has elapsed from then. Upon determining that the preset period has elapsed, the microcomputer starts initial check. To carry out the initial check, the microcomputer starts charging a capacitor for power supply stabilization of a drive circuit by turning on the pre-charge circuit and, when the charging of the capacitor is completed, turns on a power supply relay provided on a power supply line that connects between a battery and the drive circuit.

A method and system for reducing rollback in a counterbalancing system as a holding brake is released is disclosed. A limited amount of movement of a drive shaft is present in the holding brake. A motor drive provides current to the motor with the holding brake set such that a torque is applied at the drive shaft. The current is controlled to generate torque in both directions. The limited amount of movement in the brake may be used to determine a direction and magnitude of torque required to support a mechanical load being applied to the motor. The motor drive then provides a current to generate the necessary torque required to support the load prior to releasing the holding brake.

An apparatus for restarting a medium voltage inverter is disclosed, wherein the medium voltage inverter can be restarted by estimating a rotor speed when an input power returns from an instantaneous defective state to a normal state, whereby a time to restart the medium voltage inverter can be reduced by a simple configuration to dispense with the need to wait until the rotor speed reaches zero speed.

When a motor replacement detection portion (4) detects replacement of a motor (M), a control portion (2) of the motor control apparatus executes limiting processing for limiting action of the motor (M), at least until an acceptance portion (5) accepts an input of confirmation information from a user.

Various embodiments include determining an alternating current (AC) voltage and frequency of a supply voltage coupled to a circuit input. The circuit includes a soft starter circuit that is coupled between the circuit input and a first side of an AC motor. A stator winding configuration of the AC motor is determined. A control transformer is configured in response to the AC voltage and frequency, wherein the control transformer is coupled to the circuit input. A jumper device is configured on a second side of the AC motor in response to the stator winding configuration of the AC motor.

A motor driving device which can reduce a load burden on a rotating shaft when a magnetic bearing is initially operated. When a rotor and a stator are initially aligned, the motor driving device can apply a greater current to a coil positioned farthest away from the ground among a plurality of coils than to the other coils, so as to reduce a levitation force necessary for initial alignment of the rotor and the stator.

The present disclosure provides an electric tool and a control method thereof. The electric tool comprises a walking unit and a working unit, wherein the walking unit comprises a walking assembly, a walking control assembly, and a walking switch assembly; the working unit comprises a working assembly, a working control assembly, and a working switch assembly; when at least one of the walking switch assembly and the working switch assembly is turned on, at least one of the walking control assembly and the working control assembly receives a lock signal; and when the walking switch assembly and the working switch assembly are both turned on, and then the switch assembly corresponding to the control assembly that receives the lock signal remains on, at that time the control assembly that receives the lock signal simultaneously controls the walking assembly and the working assembly to work.

The present disclosure provides an electric tool and a control method thereof. The electric tool comprises a walking unit and a working unit, wherein the walking unit comprises a walking assembly, a walking control assembly, and a walking switch assembly; the working unit comprises a working assembly, a working control assembly, and a working switch assembly; when at least one of the walking switch assembly and the working switch assembly is turned on, at least one of the walking control assembly and the working control assembly receives a lock signal; and when the walking switch assembly and the working switch assembly are both turned on, and then the switch assembly corresponding to the control assembly that receives the lock signal remains on, at that time the control assembly that receives the lock signal simultaneously controls the walking assembly and the working assembly to work.

In a method for monitoring the operation of an electric motor and a lifting mechanism, the motor current is acquired, and the electric motor has, for example, an electromagnetically actuable brake, e.g., a holding brake. In the method, a pre-magnetization is performed when the electric motor is switched on, the characteristic of the acquired values of the motor current is monitored for an exceeding of a permissible measure of deviation from a setpoint characteristic, and a brake of the electric motor is activated, e.g., remains applied.