Foxnum Technology Co., Ltd.

Yaw-Shen Lai

Rong-Hwang Horng

You-Ren Lin

Shen-An Chen

Rong-Cong Hung

Shih-Chang Chen

Hsing-Chang Liu

Chin-Hsien Ting

Hsuan-Hung Hsu

Chih-Wei Hsieh

Shu-Chi Chang

A device for controlling an induction motor includes a voltage/frequency controller, a pulse width modulation controller, and a converter. The voltage/frequency controller receives a controlling frequency, and outputs a controlling voltage corresponding to the controlling frequency. The pulse width modulation controller receives the controlling voltage and the controlling frequency, and generates PWM signals according to the controlling voltage and the controlling frequency. The converter receives the PWM signals, and controls the induction motor according to the PWM signals. There is a predetermined relationship between the controlling voltage and the controlling frequency stored in the voltage/frequency controller. The controlling voltage is greater than zero in response to the controlling frequency being zero, and increasing the controlling frequency increases the controlling voltage as in the predetermined relationship.

Device for controlling induction motor

A location system is configured for determining a magnetic pole position of a motor. The location system includes a motor driver, a current control module, a current feedback apparatus, a speed feedback apparatus, and a magnetic pole position location module. The current control module is configured for set current of the motor via the motor driver. The current feedback apparatus is configured for sensing an actual current of the motor. The speed feedback apparatus is configured for sensing an actual speed of the motor. The magnetic pole position location module is configured for inputting a magnetic pole position of the motor, receiving the actual current from the current feedback apparatus, receiving the actual speed from the speed feedback apparatus, and processing the actual current and the actual speed to obtain an initial magnetic pole position.

Location system and method

A compensating system for compensating a cogging torque of a motor includes a speed measuring apparatus, a moment of inertia measuring apparatus, a rotor position sensor, a processor, a plurality of band-pass filters, and a current control apparatus. The processor receives a speed, a moment of inertia, and a rotor position of the motor, to determine the cogging torque of the motor. Each band-pass filter is arranged with a different frequency to filter different frequencies of waveforms of the cogging torque. The processor determines a Fourier transformation of the cogging torque according to a number of Fourier coefficients from the band-pass filters, a cogging torque at a preset rotor position, and a cogging current according to the Fourier transformation of the cogging torque. The current control apparatus outputs a current opposite to the cogging current, to compensate the cogging torque of the motor.

Compensating system and method for cogging torque of motor

A speed controller used in a control loop of a motor includes a comparator, a processing device, and an arithmetic logical unit (ALU). The comparator compares a received instruction speed or a received measured speed of the motor with a predetermined speed value, outputs a first signal to the processing device when the received speed is greater than the predetermined speed value, or outputs a second signal to the processing device when the received speed is equal to or less than the predetermined speed value. The processing device receives a speed difference between the instruction speed and the measured speed. The processing device outputs a first proportional value when the first signal is received, or outputs a second proportional value when the second signal is received. The ALU outputs an instruction current to the control loop by calculating the proportional value according to a predetermined calculation rule.

Motor speed controller

An apparatus and method for servomotors of an electric injection molding machine includes a motion controlling unit, two driving amplifying units, and two servomotors respectively connected to the driving amplifying units. The motion controlling unit includes two servomotor position controllers both for receiving a first position command, and the driving amplifying units are respectively connected to the servomotor position controllers for receiving a second and third position command. Two position detectors are respectively received in the two screw caps that are mounted to the servomotors for detecting absolute positions of the corresponding screw caps. The screw caps are respectively connected to inputs of the first and second servomotor position controllers to form two screw cap position feedback circuits. The values of the screw cap position feedback circuits are compared to the first position command for being input into the driving amplifying units to drive the corresponding servomotors to act synchronously.

Apparatus and method for controlling servomotor of electric injection molding machine

An auto-detection system for communication protocol includes a driving device, a communication mode selection circuit and a human-machine interface circuit. The human-machine interface circuit transmits a detection signal to the driving device through the communication mode selection circuit. The detection signal includes a transmission speed identification and a transmission mode identification. The driving device sets its transmission speed according to the value of the transmission speed identification of the detection signal and sets its transmission mode according to the transmission mode identification of the detection signal. An auto-detection method for communication protocol using the auto-detection system for communication protocol is also provided.

Auto-detection system and method for communication protocol

A pulse generator includes a pulse command register and a digital differential analyzer (DDA). The pulse command register includes a first register, a second register, and an adder. The first register receives and stores a pulse command from a CPU in an operating cycle. The second register receives and stores the pulse command shifted from the first register when the first register receives a second pulse command from the CPU in the operating cycle. The adder sums the pulse commands of the first register and the second register and the result is transmitted to the DDA. The DDA determines whether a pulse is to be generated after calculation according to the result from the adder of the pulse command register.

Pulse generator

A detecting apparatus and method for detecting deformation of a fixed mold plate of an injection molding machine. The apparatus includes a mounting member and an elastic member that is received in the through hole of the mounting member and generally positioned at the center thereof. The apparatus also has a contacting member that is received in the through hole and positioned near or at the first end surface, and a sliding member that is slidably received in the through hole near or at the second end surface. A blocking member is attached to the second end surface of the mounting member. A pressure sensor is fixed between the blocking member and the contacting member.

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Taipei Hsien, Taiwan

Yaw-Shen Lai