摘要:
A lawn mower (1) includes a housing (3), a motor (4) which is connected with the housing and is provided with a motor shaft (6), a mowing blade (8) connected with the motor shaft and having at least one cutting edge (10), a power providing device which provides the motor with power when the lawn mower works so as to rotate the blade at a cutting speed. The lawn mower also includes a speed control device (14) which can achieve constant speed control, and the speed control device under the constant speed control state maintains the cutting speed at one predetermined constant speed at least.
摘要:
Disclosed is technology for driving a switching element, for driving a load, within a suitable temperature range. In a normal control state, the MCS (20), on the basis of power supply voltage or an indication value, transfers the operational state of a motor (60) among PWM drive, DC drive, and output stop. If the MCS (20) determines, as a result of monitoring of output of the self-diagnostic output circuit (40) or output of the temperature detection circuit (70), that an anomaly has occurred, the MCS (20) transfers the motor control state of the motor (60) to fail-safe control (I). Here, if the motor (60) is in PWM drive, the MCS (20) calculates the temperature of the IPS (30) on the basis of the output of the temperature detection circuit (70), and if the temperature is determined to be at least a predetermined temperature, for example, at least 110 degrees, transfers the operational mode of the motor from PWM drive to DC drive.
摘要:
An electrical appliance with a resonant motor (10) for driving a vibratory component is provided that has a control unit for driving the resonant motor (10) with a predetermined driving frequency and for measuring at a predetermined time of measurement (t m ) within a driving cycle the motion-induced voltage of the resonant motor (10) and for determining whether the measured voltage value coincides with a predetermined target voltage value or whether the measured voltage value has crossed over the predetermined target value.
摘要:
The present disclosure proposes a resonant motor unit that has a resonant motor, a control unit for driving the resonant motor at a driving frequency, for short-circuiting the resonant motor during at least a first short-circuiting phase in successive driving cycles and for concluding the first short-circuiting phases by switching off the current flow through the resonant motor at least at a predetermined first time instant within the driving cycles, a measurement unit for successively measuring at least a first voltage signal provided by the resonant motor at the predetermined first time instant, and an evaluation unit for determining whether the first voltage signal has changed between successive measurements.
摘要:
A power tool powered by a battery having a plurality of battery cells, comprising: means for measuring voltage of the battery while current is being drawn from the battery; means for interrupting current momentarily to measure voltage of the battery in an unloaded condition; means for measuring voltage of the battery in an unloaded condition; means for comparing the unloaded voltage measure to a voltage cutoff threshold; and means for resuming current draw from the battery when the unloaded voltage measure exceeds the voltage cutoff threshold. A method is also provided for operating the power tool.
摘要:
A single low side power transistor switch is used to efficiently control a brushed motor in a. forward rotational direction. A boost voltage power supply is used to supply voltage to the brushed motor in a reverse rotational direction or to brake from the forward rotational direction. A digital device controls the brushed motor rotational speed and rotational directions.
摘要:
The invention relates to a method for providing a trigger signal in response to the commutation of a mechanically commutated electric motor (1). The method comprising the steps of providing a mechanically commutated electric motor (1), providing a power supply for said mechanically commutated electric motor via electrical supply leads (10, 11) from power supply circuitry, providing a filter (15) connected to said electrical supply leads (10, 11), detecting with said filter (15) a voltage spike occurring at commutation, outputting from said filter (15) said trigger signal.
摘要:
Circuitry (e.g., 7, 9) for controlling motors (e.g., Figs. 2A and 2B), such as a brushless motor (BLM). is disclosed. The circuitry (e.g., 7, 9) may comprise one or more inputs for receiving rotor position signals (e.g., 91, 92) from one or more Hall effect sensors (e.g., 3) that detect the position of, for example, a BLM rotor (e.g., Figs 2A and 2B). The circuitry (e.g., 7, 9) may also comprise an input for receiving a pulse width modulated speed control signal (e.g., 114, 320). The circuitry (e.g., 7, 9) generates one or more drive signals (e.g., 322, 324, 326, 328, 41 -42, 43-44, 41 -42 (PWM), 43-44 (PWM)), each of which may comprise a Jogicai combination (e.g., a logical AND combination) of the speed control signal (e.g., 114, 320) and a rotor position signal (e.g., 91, 92), for controlling power switches (e.g., F1-F8) that are coupled to electromagnets of the BLM (e.g., Figs. 2A and 2B).