Abstract:
aparelho de acionamento de motor e aparelhagem elétrica que usa o aparelho de acionamento de motor a presente invenção implementa um aparelho de acionamento de motor (22) pequeno e barato, o qual não sofre de um surto de uma voltagem de barramento e aciona um motor de forma atenuada, embora um capacitor de atenuação incluído no aparelho de acionamento de motor (22) tenha uma capacitância pequena. o aparelho de acionamento de motor (22) inclui um circuito de retificação e atenuação (2), um inversor (3) que converte a potência dc a partir do circuito de retificação e atenuação (2) em uma potência ac e supre a potência ac para um motor dc sem escovas (4), e uma unidade de controle (30) provendo um sinal de acionamento para o inversor (3). o sinal de acionamento controla o inversor (3), de modo que, enquanto um elemento de comutação de um primeiro braço incluído nos braços executa uma saída de pwm, um elemento de comutação de um segundo braço incluído nos braços que são longitudinalmente opostos ao primeiro braço execute uma saída ligada. na comutação das fases condutivas do motor dc sem escovas (4), a unidade de controle (30) provê o sinal de acionamento para fazer com que um elemento de comutação de um terceiro braço incluído nos braços que são longitudinalmente opostos ao segundo braço comece uma outra saída ligada, quando o elemento de comutação do segundo braço terminar a saída ligada.
Abstract:
To present a motor drive control device capable of realizing high speed driving by a simple power feeding control method. The motor drive control device of the invention has a three-phase full bridge circuit for adjusting the feeding phase so as to invert the terminal voltage in feeding-off time, by cyclically repeating positive direction feeding period, non-feeding period, negative direction feeding period, and non-feeding period. In high speed driving, the phase is adjusted so as to invert the terminal voltage right after feeding-off, and if not reaching the desired rotating speed, the feeding time is shortened. As a result, the phase angle to the actual applied voltage can be advanced, and high seed rotation by weak-field system driving is realized. When there is a sufficient allowance in the voltage, the phase is adjusted so as to invert the terminal voltage immediately before turning on the feeding, and the feeding time width is adjusted so that the phase relation of the feeding-off time and the terminal voltage inverting time may be a desired relation and the applied voltage and the current phase are optimized, and the maximum efficiency driving is realized.
Abstract:
Brushless DC motor (4) is driven based on a first or second waveform signal output from operation switching unit (11), which switches output so that a first waveform signal by first waveform generation unit (6) is output when the speed of rotor (4a) is determined to be lower than a predetermined speed, and a second waveform signal by second waveform generation unit (10) is output when the speed of rotor (4a) is determined to be higher than the predetermined speed. Thus, there is provided a motor driving device in which drive is stable even at high speed / under high load, and a driving range is extended.
Abstract:
Phase correction unit (25) for outputting a commutation signal for switching a winding that allows a current to flow to brushless DC motor (4) and drive unit (16) for outputting a drive signal indicating supplying timing of electric power supplied to brushless DC motor (4) by inverter (3) based on the commutation signal output from phase correction unit (25) are provided so as to maintain a predetermined relation between a phase of a current flowing to a predetermined winding of brushless DC motor (4) and a phase of a voltage. Since brushless DC motor (4) is driven by a signal for holding the predetermined relation between the phase of the current and the phase of the voltage, the stability of drive under high-speed and high-load conditions is enhanced and a drive range is extended.
Abstract:
PROBLEM TO BE SOLVED: To improve the stability of a brushless DC motor at high-load and high-speed drive, and to expand a drive region. SOLUTION: A system is provided which has: the brushless DC motor 4 composed of a rotor 4a having permanent magnets and a stator having a three-phase winding; an inverter 3 for feeding power to the three-phase winding; and a fail-safe function which surely obtains a phase of a current flowing in the winding of the brushless DC motor by selecting either a winding current or an output terminal voltage of the inverter 3 according to the drive state of the brushless DC motor 4, switches windings for carrying electricity to the brushless DC motor 4 so that a current phase and a voltage phase of the brushless DC motor 4 keep a prescribed phase relationship, detects the state where current phase detection is impossible while expanding a drivable load region of the brushless DC motor 4, and limits an output to the brushless DC motor 4 at state detection. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To solve the problem wherein no current flow to DC circuits and no current can be detected, thereby drive cannot be performed stably due to voltage drop close to 0 V when the capacitance of smoothing capacitors is decreased for miniaturization.SOLUTION: When a voltage decision means 115 determines that a pulsating bus voltage drops lower than a preset threshold, a control means 114 of controlling a voltage to be applied to a motor 106 from an inverter 105 energizes an output to the motor 106 for an extremely short time so that a DC current becomes a negative current, thus preventing the voltage between DC buses from dropping close to 0 V because the motor 106 charges the smoothing capacitor, detecting current even if the capacitance of the capacitor 103 is reduced extremely, thereby performing stable drive.
Abstract:
PROBLEM TO BE SOLVED: To provide a reliable driving device for a brushless DC motor wherein the stability of the brushless DC motor in high-load/high-speed driving is enhanced to expand a driving range, and an unstable state due to an external cause is suppressed. SOLUTION: The driving device includes: a brushless DC motor 4 comprised of a rotor 4a having a permanent magnet and a stator having three-phase winding; and an inverter 3 that supplies power to the three-phase winding. According to the terminal voltage of the brushless DC motor 4 and predetermined phase relation, the following waveforms are outputted in a predetermined frequency on a case-by-case basis: at low speed, a rectangular wave with an energization angle of not less than 120 degrees and not more than 150 degrees or a waveform based thereon is outputted; and at high speed, a rectangular wave or a sine wave with an energization angle of not less than 120 degrees and less than 180 degrees or a waveform based thereon is outputted. As a result, the induced voltage and phase current of the brushless DC motor 4 and the terminal voltage phase are stabilized with an appropriate phase relation corresponding to load and speed. Driving stability is then enhanced in high-load/high-speed driving. COPYRIGHT: (C)2010,JPO&INPIT