Intermediate-frequency frequency converter for driving of high-speed electric spindle of internal grinding machine
A high-speed electric spindle and internal grinding machine technology, applied in the field of frequency converters, to achieve good dynamic response, low switching frequency requirements, and simple control logic
Pending Publication Date: 2019-01-08
浙江机电职业技术学院
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Problems solved by technology
When many books and academic papers discuss static inverters, they are based on 50Hz power frequency AC power supply. However, according to the basic theory of motor speed regulation, the maximum motor speed regulation can only be below 3000r / min. The design theory of inverters based on 50Hz power frequency There are some limitations in practice and application
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[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0027] Such as figure 1 In the described embodiment, an intermediate frequency inverter for driving a high-speed electric spindle of an internal grinding machine includes a ramp function generator circuit 1, a PWM pulse train forming circuit, a chopping pulse generating circuit, a six-frequency divider and a PWM Signal forming circuit, high-frequency pulse amplifying circuit 9 and main circuit of chopper voltage regulating frequency converter, PWM pulse train forming circuit includes PI regulator 2, V / f converter 3, f / V converter 4 and proportioner 5, chopper The wave pulse generating circuit includes a voltage regulator 10, a triangular wave generator 11, a comparator 12, and a chopping pulse circuit 13. The six-frequency loop meter and PWM signal forming circuit includes a frequency divider 7 and a loop meter circuit 8. The chopping and volta...
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The invention discloses an intermediate-frequency frequency converter for driving of a high-speed electric spindle of an internal grinding machine. The intermediate-frequency frequency converter comprises a ramp function generator circuit, a PWM pulse train forming circuit, a chopping pulse generation circuit, a six-frequency division ring counter and PWM signal forming circuit, a high-frequency pulse amplification circuit and a chopping voltage regulation frequency converter main circuit, wherein the ramp function generator circuit is sequentially connected with the PWM pulse train forming circuit, the chopping pulse generation circuit, the PWM pulse train forming circuit, the six-frequency division ring counter and PWM signal forming circuit, the high-frequency pulse amplification circuit and the chopping voltage regulation frequency converter main circuit; the PWM pulse train forming circuit is connected with the chopping pulse generation circuit; and the chopping pulse generation circuit, the high-frequency pulse amplification circuit and the chopping voltage regulation frequency converter main circuit are sequentially connected. The intermediate-frequency frequency converter has the beneficial effects that chopping frequency is relatively high, and dynamic response during voltage control is relatively good; and voltage regulation and frequency modulation links are controlled by command voltage, U / f comprehensive regulation is achieved, and voltage and frequency are matched well in the control aspect.
Description
technical field [0001] The invention relates to the related technical field of frequency converters, in particular to an intermediate frequency frequency converter used for driving a high-speed electric spindle of an internal grinding machine. Background technique [0002] In the bearing manufacturing process, various internal grinding machines are widely used. These grinding machines all use a high-speed electric spindle (commonly known as "grinding head motor"), and the grinding head motor is an AC high-speed motor, which is an indispensable part of the inner hole of the grinding part. The high-speed electric spindle directly drives the grinding wheel without intermediate transmission parts, high speed, high output power, strong short-time overload capability, hard speed characteristics, small vibration and long spindle bearing life, so it is widely used. Using intermediate frequency AC static inverter to drive high-speed electric spindle can reduce the energy consumption...
Claims
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Login to View More IPC IPC(8): B24B41/04B24B47/00
CPCB24B41/04B24B47/00Y02P70/10
Inventor 俞建军
Owner 浙江机电职业技术学院