Asm Assembly Automation Limited

Asm Technology Singapore Pte Ltd

Wai Chuen Gan

Gary Peter Widdowson

Hon Yu Peter Ng

Siu Yan Ho

Shing Wai Tam

Pei Wei Tsai

Gang Ou

Chak Tong Sze

Cheuk Wah Tang

Shiqiang Yao

Wai Hong Sizto

Chor Fai Wong

Chunbai Wang

Wang Hay Kenneth Tsui

A linear switched reluctance motor comprises a movable coil bracket including first and second coil assemblies. Each of the first and second coil assemblies further comprises a plurality of coils separately wound around a plurality of motor coil cores, each of the coils being configured to receive a sinusoidal current at a different phase from other coils comprised in the same coil assembly. Tooth members of a stator track are located adjacent to the motor coil cores such that a magnetic flux path is created which passes through the motor coil core, the stator track and an air gap between the motor coil core and the stator track. A multiple-phase motor driver electrically connected to the first and second coil assemblies generates symmetric multiple-phase sinusoidal currents for driving the motor.

Multiple-phase linear switched reluctance motor

A direct current motor comprises a magnet assembly having a pair of magnets for generating a magnetic field and a coil assembly located between the pair of magnets, the coil assembly and the magnet assembly being movable relative to each other. The coil assembly further comprises a first coil section and a second coil section which are electrically connected to each other. A current generator is electrically connected to the coil assembly and is operative to provide first, second and third currents. The first current is electrically connected directly to the first coil section and the second current is electrically connected directly to the second coil section whereas the third current is electrically connected to the first and second coil sections at a position connecting the first and second coil sections.

Direct current motor incorporating thermal control

A device sorting apparatusis disclosed herein. In a described embodiment, the device sorting apparatuscomprises a plurality of bin connectorsfor coupling to respective bins for storing sorted devices and a rotary distribution modulefor receiving a deviceto be sorted and for discharging the deviceselectively into one of the bin connectorsto enable the deviceto be unloaded to the respective bin. The device sorting apparatusfurther comprises a sensorcoupled to the rotary distribution modulefor detecting the discharge of the device, and which is rotatable together with the rotary distribution module; and a rotary transformerfor powering the sensor

Device sorting apparatus

A system for maintaining thermal stability of a motion stage driven by a motor comprises a motion current generator operative to produce a motion current to drive the motion stage to move and a thermal current generator operative to produce a thermal current to dissipate heat in the motion stage for controlling a temperature of the motion stage without producing corresponding movement of the motion stage. A summation controller is operative to combine the motion current with the thermal current, and to produce a combined current output to the motor.

System for maintaining thermal stability of a motion stage

A driving mechanism comprises a fixed housing, a movable housing on which an object to be driven is mounted and a driving motor which is operative to drive the movable housing to move linearly as well as to rotate relative to the fixed housing. An inductance-type encoder determines both linear and rotary displacement of the movable housing relative to the fixed housing, whereby to provide closed-loop control of the position of the object in both linear and rotary directions.

Driving mechanism having position encoder for two-dimensional positioning

A motor is provided comprising a magnet assembly having two rows of magnets arranged along a first axis, which are separated by a gap for generating magnetic flux lines between the rows of magnets. The motor further comprises a coil bracket which is located within the gap between the two rows of magnets. The coil bracket includes a first set of coils arranged along the first axis that are operative to drive movement of the coil bracket relative to the magnet assembly along the first axis. A second set of coils arranged along the first axis are operative to drive movement of the coil bracket relative to the magnet assembly along a second axis which is orthogonal to the first axis between a first end position and a second end position along the second axis. The first set of coils is fully located within the flux lines generated by the magnet assembly at both the first and second end positions of the coil bracket and the second set of coils is located at least partially outside the flux lines generated by the magnet assembly at the second end position of the coil bracket.

Dual-axis planar motor providing force constant and thermal stability

A method for damping vibrations in a stepper motor with micro-stepping control which comprises the steps of identifying the force amplitudes and phase shifts of multiple harmonic detent torques of the stepper motor, such as the first, second and fourth harmonic detent torques, and tuning the stepper motor with different current commands until minimum friction and resistive torque are obtained. Thereafter, a compensating harmonic current derived from said force amplitudes and phase shifts of the said multiple harmonic detent torques is injected into a current command during operation of the stepper motor to compensate for torque ripples.

Growing community of inventors

Hong Kong, China

Wai Chuen Gan