A main drive control method for glass factories, comprising the following steps: (a) providing a first circuit breaker and a second circuit breaker on a power supply loop of an electrical motor, wherein one end thereof is respectively connected to two main drive electrical motors; (b) enabling the first circuit breaker to be connected to a municipal power supply and the second circuit breaker to be connected to a UPS power supply; and (c) enabling the first circuit breaker and the second circuit breaker to be interlocked via a mechanical interlocking mechanism, so that only one of the circuit breakers can be switched on during a normal operation. The main drive control method for glass factories solves the problem that the rotation speed of a main drive electrical motor is incorrect due to the interference on a signal.

In the present electric driving apparatus, coils that constitute a first armature winding and coils that constitute a second armature winding are arranged so as to alternate in a circumferential direction, and a control portion is configured so as to perform single-system driving when one of a first system and a second system fails, the single-system driving stopping driving of an inverter of the system that has failed, and controlling driving of the inverter of the system that has not failed to supply inverter phase currents to an armature winding of the system that has not failed such that the inverter phase currents are set to a second upper limit value that is greater than a first upper limit value.

A signal processor is configured to perform a process equivalent to performing a series of fixed-to-rotating coordinate conversion, a predetermined process and then rotating-to-fixed coordinate conversion, while maintaining linearity and time-invariance. The signal processor performs a process given by the following matrix G: $G=[\begin{array}{cc}\frac{F\left(s+j{}_0\right)+F\left(s-j{}_0\right)}{2}& \frac{F\left(s+j{}_0\right)}{}\end{array}$

A signal processor is configured to perform a process equivalent to performing a series of fixed-to-rotating coordinate conversion, a predetermined process and then rotating-to-fixed coordinate conversion, while maintaining linearity and time-invariance. The signal processor performs a process given by the following matrix G: $G=[\begin{array}{cc}\frac{F\left(s+j{}_0\right)+F\left(s-j{}_0\right)}{2}& \frac{F\left(s+j{}_0\right)}{}\end{array}$

A system, an electrical combination and a method for powering a load device. The combination may include a burst circuit configured to provide power to the load device to perform a burst operation, the burst circuit including a supercapacitor, a first switch between a power source and the supercapacitor and operable to control whether power is provided from the power source to charge the supercapacitor, and a second switch between the supercapacitor and the load device and operable to control whether power is provided from the supercapacitor to the load device; and an electronic processor configured to control the first switch and the second switch based at least in part on a voltage of the supercapacitor.

A system, an electrical combination and a method for powering a load device. The combination may include a burst circuit configured to provide power to the load device to perform a burst operation, the burst circuit including a supercapacitor, a first switch between a power source and the supercapacitor and operable to control whether power is provided from the power source to charge the supercapacitor, and a second switch between the supercapacitor and the load device and operable to control whether power is provided from the supercapacitor to the load device; and an electronic processor configured to control the first switch and the second switch based at least in part on a voltage of the supercapacitor.

A vacuum cleaner includes a suction inlet, a motor, and an impeller connected to the motor and operable to generate suction through the suction inlet upon operation of the motor. The vacuum cleaner further includes a power connector mounted to the vacuum cleaner and selectively connectable to a direct current (DC) power source and an alternating current (AC) power source. The power connector includes external terminals accessible from an exterior of the vacuum cleaner. The external terminals are configured for removable mechanical connection to each of the DC power source and an AC power supply cord such that the DC power source and the AC power supply cord are selectively and mechanically connectable to the same external power connector terminals.

A motor control device includes: a PWM controller that PWM-controls an inverter driving a three-phase motor and including three arm portions, each including a high-side switching element and a low-side switching element connected in series with each other between a first power supply line and a second power supply line connected to a potential lower than a potential of the first power supply line. In an energizing period and a non-energizing period in a case where the three-phase motor is energized from the first power supply line through the PWM-control of the inverter, during a first predetermined period in the energizing period immediately before transition from the energizing period to the non-energizing period, the PWM controller performs a SWEEP of a signal applied to one of the high-side switching element and the low-side switching element, and performs a synchronous rectification control.

A motor control device includes: a PWM controller that PWM-controls an inverter driving a three-phase motor and including three arm portions, each including a high-side switching element and a low-side switching element connected in series with each other between a first power supply line and a second power supply line connected to a potential lower than a potential of the first power supply line. In an energizing period and a non-energizing period in a case where the three-phase motor is energized from the first power supply line through the PWM-control of the inverter, during a first predetermined period in the energizing period immediately before transition from the energizing period to the non-energizing period, the PWM controller performs a SWEEP of a signal applied to one of the high-side switching element and the low-side switching element, and performs a synchronous rectification control.

A feedback control switching unit of an inverter control unit selects, based on a magnitude relationship between a predetermined switching determination amount and at least one switching threshold, at least one of feedback control units to thereby execute switching among feedback control modes, such as a current feedback control mode and a torque feedback control mode, of the respective feedback control units for driving of the AC motor. A switching command generating unit generates a switching command for an inverter based on a manipulated variable calculated by the selected feedback control unit. When a torque response request determining unit determines that a required torque responsiveness is high, the feedback control switching unit reduces the number of executions of switching among the feedback control modes.