Abstract: A stepper motor driver includes an H-bridge including first and second outputs. The H-bridge includes a low-side transistor coupled between the first output and a ground. A reference current circuit is configured to produce a reference current. The reference current circuit has a reference output. An averager circuit includes an input and output. The input of the averager circuit is coupled to the first output of the H-bridge. A comparator includes first and second comparator inputs. The first input of the comparator is coupled to the output of the average circuit and the second input of the comparator is coupled to the reference output.

Abstract: An electronic watch includes a motor including a coil, a driver controlled to an ON state for supplying a driving current to the coil and an OFF state for not supplying the driving current, a driver controller configured to control the driver to the ON state or the OFF state depending on a value of a current flowing through the coil, and a polarity switcher configured to switch a polarity of the driving current when a prescribed condition is satisfied after detecting that an ON time, which is a duration of the ON state of the driver controller, reaches a maximum.

Abstract: A motor control circuit includes a driver having ON and OFF states, and outputs a drive signal to a coil of a motor, a lower limit detector detecting whether current flowing through the coil is less than a lower limit, an upper limit detector detecting whether current flowing through the coil is more than an upper limit, a drive controller placing the driver into the ON state based on a detection result in the lower limit detector after the driver is brought into the OFF state, and placing the driver into the OFF state when the upper limit detector detects that the current is more than the upper limit after a predetermined time elapses from the driver being placed in the ON state, and a polarity switcher switching a polarity of the drive signal when an OFF time of the driver satisfies a polarity switching condition.

Abstract: An electric power steering apparatus includes a motor, a controller including electrical components mounted on a substrate, and a connector unit including a cover that includes a first connector and a second connector, the first and second connectors connecting power and signals, in which each of the first connector and the second connector comprises a power supply part and a signal connection part, each of the power terminal and the signal terminal extend from the substrate in an axial direction of the motor, each of the power terminal and the signal terminal extend through the cover, each of the first connector and the second connector are arranged within a silhouette of the motor along the axial direction of the motor, each of the first connector and the second connector comprises an opening positioned on a side of the cover opposite the motor in the axial direction of the motor, the first connector and the second connector connect to and disconnect from the harness in a direction substantially parallel to

Abstract: A stepping motor includes a rotor, a stator and three coils. The rotor is two-pole magnetized in a radius direction. The stator is provided with a rotor receiving section for receiving the rotor. The three coils are magnetically connected with the stator. At least one of the three coils is an integrated coil which is integrally formed with the stator by winding a coil around a part of the stator.

Abstract: A drive apparatus is provided with a motor, a plurality of substrates and a plurality of connectors. The substrates are provided in one side of the motor in the axial direction thereof, the substrates including switching elements and control components mounted thereon. The connectors are provided in an opposite side against the motor across the substrates, the connectors including connector terminals connected to one of the substrates. The substrates include two or more non-overlapped regions where no substrates are overlapped when projecting the substrates in the axial direction. The non-overlapped regions include a connector connecting region connected to the connector terminals, and a motor line connecting region connected to winding groups of the motor corresponding to every phase of each winding group.

Abstract: A stepping motor driving device drives a first coil and a second coil. The stepping motor driving device includes a motor control unit. The motor control unit applies a predetermined voltage to the first coil in a first phase, applies the predetermined voltage to the second coil in a second phase after the first phase, and alternately applies the predetermined voltage to the first coil and the second coil in a third phase after the second phase.

Abstract: An electrical machine is provided, comprising a stator (8) and a rotor (9). The stator comprises slots (1, 2) for receiving a coil of an electrical winding. The coil has a first number of turns (n1) in a first slot (1) and a second number of turns (n2) in a second slot (2).

Abstract: An electrical machine is provided, comprising a stator (8) and a rotor (9). The stator comprises slots (1, 2) for receiving a coil of an electrical winding. The coil has a first number of turns (n1) in a first slot (1) and a second number of turns (n2) in a second slot (2).