A direct drive servo motor is provided and may include a quadrature encoder and a silicone rubber sleeve affixed to the encoder's shaft that is attached to the rotor hub and may also include an axle fixed to the rotor hub, inner and outer bearings, front and rear bearing plates, an outer stator, and an inner rotor rare earth magnet ring. A computer-controlled camera system is also provided and includes a direct drive camera gimbal; a pan-bar system; a robotic control system; a master interconnect unit; custom control software; and a track and gantry system. A universal camera tripod head adapter is also provided and includes front and rear clamps, a clamp handle, side and rear brackets and a silicone rubber sleeve affixed to the shaft of each encoder that rides on the pan and tilt axis lips of a camera tripod head.

A phase control circuit for a brushless motor includes a signal output unit that outputs M signals, whose phases differ from each other, in response to a change in the magnetic field resulting from the rotation of magnets placed in a rotor, and a control signal generator that generates two or more different kinds of group of phase control signals, based on at least the M signals, the group of phase control signals being used to control drive voltages, whose phases differ from each other, which are supplied to each phase of an N-phase coil (N being an integer greater than or equal to two). The control signal generator is configured such that a first phase control signal group and a second phase control signal group can be generated.

A moisture resistant rotor sleeve includes a plurality of stacked laminations forming a sleeve having an outer periphery, an inner periphery, and spaces between adjacent laminations. The rotor sleeve also includes a sealant coupled to the inner periphery such that the outer periphery is free of sealant. The sealant seals the spaces to prevent fluid from traveling through the spaces of the sleeve between the inner periphery and the outer periphery.

Embodiments of the invention relate generally to directed self-assembly (DSA) and, more particularly, to the DSA of electronic components using diamagnetic levitation.

An electric motor having low vibration and/or noise comprises a rotor or stator comprising permanent magnets each comprising at least two pole pairs, with an internal flux gap within the permanent magnets between adjacent internal pole pairs. The internal flux gap between the internal pole pairs may be similar to an external pole to pole physical spacing between adjacent poles of adjacent magnets. The motor is suitable for use in for example a laundry washing machine or dryer or washer-dryer.

An electric motor having low vibration and/or noise comprises a rotor or stator comprising permanent magnets each comprising at least two pole pairs, with an internal flux gap within the permanent magnets between adjacent internal pole pairs. The internal flux gap between the internal pole pairs may be similar to an external pole to pole physical spacing between adjacent poles of adjacent magnets. The motor is suitable for use in for example a laundry washing machine or dryer or washer-dryer.

A rotor may include a planar lamination having permanent magnets arranged therein, and an inner edge defining an opening configured to receive a driveshaft. The planar lamination may include a driveshaft key, and a relief notch and scallop disposed on each side of the driveshaft key. The relief notch and scallop may distribute stress imparted to the driveshaft key and reduce deformation due to centrifugal loads during rotation of the rotor. The relief notches may be next to the driveshaft key. The relief notches may be sandwiched between the scallops. The inner edge may include additional scallops.

The present disclosure relates generally to rotors for electric motor assemblies and methods of making the same, and more specifically, to variable thickness rotors for axial flux motors. More specifically, annular-shaped rotors having interiorly disposed magnets for axial flux motors are provided in certain aspects. The variable thickness rotors may each include an annular-shaped body having a first thickness at a first radial position and a second thickness at a second radial position. The first radial position may be spaced apart from the second radial position. The first thickness may be greater than or equal to about 200% of the second thickness.

An electrical machine (20) having a stator (21) and a rotor (22) mounted rotatable with respect to the stator (21) is provided. The rotor (22) comprises at least one magnetic pole pair that has two magnets (23). Further, the rotor (22) comprises at least two recesses (25) that extend at least partially through the rotor (22), the recesses (25) being arranged at opposite sides of the rotor (22), and the number of magnetic pole pairs of the rotor (22) being different from the number of electromagnetic pole pairs able to be generated during operation of the rotor (22). Further disclosed is a method of operating the electrical machine (20).

A motor control apparatus excites an excitation phase targeted for excitation among a plurality of excitation phases of a motor. The motor control apparatus, in a state in which a rotor of the motor is stopped, excites an excitation phase corresponding to a stop position of the rotor among the plurality of the excitation phases, and measures a physical quantity which changes in accordance with an inductance of at least one of a plurality of coils configuring the plurality of excitation phases. The motor control apparatus estimates a temperature of the rotor from a measurement value of the measured physical quantity, and decides a parameter value for control of the motor based on the estimated temperature.