Motor drive device, motor assembly and load drive device

Abstract

The invention provides a motor drive device, a motor assembly employing the same and a load drive device. The motor drive device includes a start control circuit and a bridge-type circuit. The bridge-type circuit includes a first bridge arm and a second bridge arm. The first bridge arm includes a first and a second bidirectional electronic switch connected in series. The second bridge arm includesa third and a fourth bidirectional electronic switch connected in series. The first bridge arm and the second bridge arm are connected between a first terminal and a second terminal of an AC power source in parallel. The synchronous motor is connected between a connection point of the first and the second bidirectional electronic switch and a connection point of the third and the fourth bidirectional electronic switch. The start control circuit controls the first and the fourth bidirectional electronic switch and a second and a third bidirectional electronic switch to connect in an alternating manner in a state stage of the motor and provides continuous drive force for the synchronous motor in each cycle of the AC power source.

Description

Technical field [0001] The invention relates to the field of motor control, in particular to a motor drive device for driving a single-phase synchronous motor, and a motor assembly and load drive device using the motor drive device. Background technique [0002] Single-phase synchronous motors have the advantages of small size, light weight, high efficiency, low energy consumption, simple structure, reliable work, convenient maintenance, etc., and can adapt to the development requirements of small and lightweight motors and high output power. Used in household appliances, power tools, medical equipment and light industrial equipment. Please refer to figure 1 , Is the drive circuit diagram of the existing single-phase synchronous motor. The starting control circuit 15 and the motor 12 are connected to both ends of the AC power supply 11 to drive the operation of the motor 12. The starting control circuit 15 includes a motor 12 is a two-way switch connected in series to both ends ...

AI Technical Summary

Problems solved by technology

figure 2 for figure 1 The waveform diagram of the motor voltage for the shown single-phase synchronous motor, from figure 2 It can be seen that in the starting phase experienced by the motor 11 before the full-pass operation phase, there is a vacancy in the half-wave series of the motor voltage, resulting in a small starting torque of the motor and inconsistent torque, which is not suitable for starting a motor with a large starting torque and moment of inertia. load

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